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HOLDEN GEN III V8 Service Training

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GEN III V8 ENGINE MANAGEMENT

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Summary of Contents for HOLDEN GEN III V8

  • Page 1 HOLDEN GEN III V8 ENGINE MANAGEMENT...
  • Page 2 HOLDEN LTD A.C.N. 006 893 232 SERVICE TRAINING COPYRIGHT - HOLDEN LTD Reproduction in whole or in part prohibited without written approval February 2000...
  • Page 4 GEN III V8 ENGINE MANAGEMENT CONTENTS SUBJECT GEN III V8 ENGINE MANAGEMENT...
  • Page 5 GEN III V8 ENGINE MANAGEMENT NOTES • GEN III V8 ENGINE MANAGEMENT...

  • Page 6: General Information

    GEN III V8 ENGINE MANAGEMENT GENERAL INFORMATION The GEN III V8 engine uses a Powertrain Control Module (PCM) to control exhaust emissions while maintaining excellent driveability and fuel economy. The PCM maintains a desired air/fuel ratio at precisely 14.7 to 1 . To maintain a 14.7 to 1 air fuel ratio the PCM monitors the output signals from two oxygen sensors.
  • Page 7 GEN III V8 ENGINE MANAGEMENT Page - 2 GEN III V8 ENGINE MANAGEMENT...
  • Page 8 GEN III V8 ENGINE MANAGEMENT Page - 3...

  • Page 9: Powertrain Control Module

    GEN III V8 ENGINE MANAGEMENT POWERTRAIN CONTROL MODULE The Powertrain Control Module (PCM), is located in the engine compartment and constantly monitors the information from various sensors, and controls the engine and transmission operation, dependant on the information received from these sensors The PCM performs the diagnostic function of the system It can...
  • Page 10 GEN III V8 ENGINE MANAGEMENT PCM Five Volt Reference Circuits The PCM has two five volt reference circuits The five volt reference circuit number one supplies five volts to the following sensors • The Throttle Position Sensor (J1 -08) •...
  • Page 11 GEN III V8 ENGINE MANAGEMENT DIAGNOSIS The Rowel-train Management Section of the Service Manual is where to start all dnveability and emissions diagnosis Once you have read and understood the General Information Section which contains reference material wiring diagrams, PCM terminal end views and normal voltages, and component locations (Remember,...

  • Page 12: Diagnostic Information

    GEN III V8 ENGINE MANAGEMENT Basic Knowledge and Tools Required To use the VT Series Service Manual effectively, a general understanding of basic electrical circuits and circuit testing tools is required You should be familiar with wiring diagrams, the meaning of voltage, ohms, amps, the...

  • Page 13: Strategy Based Diagnostics

    GEN III V8 ENGINE MANAGEMENT Intermittent Check Powertrain Lamp In the case of an intermittent problem, the Check Powertrain lamp may light for ten seconds and then will go out However, the corresponding Diagnostic Trouble Code (DTC) will be stored in the memory of the PCM The...
  • Page 14 GEN III V8 ENGINE MANAGEMENT GEN III V8 ENGINE MANAGEMENT Page - 9...

  • Page 15: Powertrain On-Board Diagnostic System Check

    GEN III V8 ENGINE MANAGEMENT POWERTRAIN ON-BOARD DIAGNOSTIC SYSTEM CHECK After the visual/physical underhood inspection, the On-Board Diagnostic System Check is the starting point for all diagnostic procedures or finding the cause of an emissions failure All Diagnostic procedures must always begin with the On-board Diagnostic System Check...
  • Page 16 GEN III V8 ENGINE MANAGEMENT GEN III V8 ENGINE MANAGEMENT Page - 1 1...

  • Page 17: System Diagnostics

    GEN III V8 ENGINE MANAGEMENT SYSTEM DIAGNOSTICS The PCM has two functions to perform 1. It must be able to control the vehicle systems using sensor inputs and internal software 2. It must also be able to perform system diagnostics...
  • Page 18 GEN III V8 ENGINE MANAGEMENT Diagnostic Testing One of the primary functions of the diagnostic management system is to perform diagnostic testing of system operation The Diagnostic is the test or tests run on a system or component to determine if it is operating according to specifications The different types of diagnostic tests include •...
  • Page 19 GEN III V8 ENGINE MANAGEMENT Diagnostic Information The diagnostic tables and functional checks in the Service Manual are designed to locate a faulty circuit or component through logic based on the process of elimination. The tables in the Service Manual are prepared with the understanding that the vehicle: •...
  • Page 20 GEN III V8 ENGINE MANAGEMENT GEN III V8 ENGINE MANAGEMENT P a g e - 1 5...
  • Page 21 GEN III V8 ENGINE MANAGEMENT DTC Information The status of the diagnostic test and the related DTC messages can be viewed by using Tech 2 The combination of messages is dependent on the status of the diagnostic test The following is a list of the DTC information messages •...
  • Page 22 GEN III V8 ENGINE MANAGEMENT Test Fail Actions When a diagnostic fails and a DTC is set, the Diagnostic Management System performs test fail actions. The test fail actions are dependent on the DTC. The Diagnostic Management System may perform the following once a DTC is set.
  • Page 23 GEN III V8 ENGINE MANAGEMENT PCM GEN III V8 ENGINE DIAGNOSTIC TROUBLE CODES (DTC) Page - 1 8 GEN III V8 ENGINE MANAGEMENT...
  • Page 24 GEN III V8 ENGINE MANAGEMENT PCM GEN III V8 ENGINE DIAGNOSTIC TROUBLE CODES (DTC) (Continued) GEN III V8 ENGINE MANAGEMENT Page - 1 9...
  • Page 25 GEN III V8 ENGINE MANAGEMENT NOTES Page - 20 GEN III V8 ENGINE MANAGEMENT...

  • Page 26: Powertrain Interface Module

    The PIM acts as a communication translator between the PCM and other control modules that use a different serial data protocol. The GEN III V8 PCM uses Class II serial data to communicate, while other control modules in the vehicle are...

  • Page 27: Serial Data Communication (Bus Master)

    Serial data transfers information in a linear fashion - over a single line, one bit at a time. The serial data line is referred to as the 'data bus'. Excluding the GEN III V8 PCM, all control modules communicating on the data bus communicate using UART communication.
  • Page 28 The BCM polls each device for a status update, once every 300 milliseconds The exception to this being the PIM (GEN III V8) which is polled twice every 300 milliseconds The PIM will construct a serial data message from information requested from the PCM via the Class 2 communication This constructed serial data message...
  • Page 29 GEN III V8 ENGINE MANAGEMENT Paqe - 24 GEN III V8 ENGINE MANAGEMENT...
  • Page 30 GEN III V8 ENGINE MANAGEMENT GEN III V8 ENGINE MANAGEMENT Page - 25...
  • Page 31 GEN III V8 ENGINE MANAGEMENT Page - 26 GEN III V8 ENGINE MANAGEMENT...

  • Page 32: Tech 2 Test Modes And Displays For Pim Diagnosis

    GEN III V8 ENGINE MANAGEMENT TECH 2 TEST MODES AND DISPLAYS FOR PIM DIAGNOSIS As a prerequisite to any PIM diagnostics the user must be familiar with the proper use of TECH 2. The following pages list the TECH 2 functions and provide a brief explanation of their operation for diagnosing the PIM.
  • Page 33 GEN III V8 ENGINE MANAGEMENT F1: Diagnostic Trouble Codes The following functions will be available in this mode: FO: Read Current DTC Information - a listing of all (if any) current DTCs that have been set by the PIM will be displayed.
  • Page 34 GEN III V8 ENGINE MANAGEMENT F2: Data Display In this test mode, TECH 2 displays the information the PIM is actually receiving and the status of the PIM outputs, such as the starter relay An explanation for each data parameter displayed on the Tech 2 is listed...

  • Page 35: Crankshaft Position Sensor

    GEN III V8 ENGINE MANAGEMENT CRANKSHAFT POSITION SENSOR The Crankshaft Position Sensor (CKP) is mounted in the right rear of the engine block behind the starter. The CKP sensor works in conjunction with a 24X reluctor wheel mounted on the rear of the crankshaft.
  • Page 36 GEN III V8 ENGINE MANAGEMENT A failure in the Crankshaft Position Sensor or circuit will set one of the following DTCs: DTC P0335 Crankshaft Position Sensor Circuit Conditions for running the DTC P0335 • DTCs P0101, P0102, P0103, P0341, P0342, P0343 are not set.

  • Page 37: Camshaft Position Sensor

    GEN III V8 ENGINE MANAGEMENT CAMSHAFT POSITION SENSOR The Camshaft Position (CMP) sensor is mounted through the top of the engine block at the rear of the valley cover The CMP sensor works in conjunction with a "IX reluctor wheel on the camshaft The reluctor wheel is...
  • Page 38 GEN III V8 ENGINE MANAGEMENT A failure in the Camshaft Position Sensor or circuit will set one the of following DTCs: DTC P0341 Camshaft Position Sensor Circuit Performance Conditions for running the DTC P0341 • The ignition voltage is between 5.0 and 17.0 volts.

  • Page 39: Mass Air Flow Sensor

    GEN III V8 ENGINE MANAGEMENT MASS AIR FLOW SENSOR The Mass Air Flow (MAF) sensor utilises a heated element type of operation. A heated element in the MAF is placed in the air flow stream of the engine intake system. The heating element is maintained at a constant temperature differential above the air temperature.
  • Page 40 GEN III V8 ENGINE MANAGEMENT The signal that is sent from the MAF sensor is sent in the form of a frequency output. A large quantity of air passing through the sensor (such as when accelerating) will be indicated as a high frequency output.
  • Page 41 GEN III V8 ENGINE MANAGEMENT A failure in the Mass Air Flow sensor or circuit will set one of the following DTCs: DTC P0101 Mass Air Flow System Performance Conditions for running the DTC P0101 • DTCsPO-102, P0103, P0107, P0108, P0121, P0122, P0123 are not set •...
  • Page 42 GEN III V8 ENGINE MANAGEMENT DTC P0103 Mass Air Flow Sensor Circuit High Frequency Conditions for running DTC P0103 • The engine speed is greater than 300 RPM • The system voltage is greater than 1 1 0 volts Conditions for setting DTC P0103 •...

  • Page 43: Manifold Absolute Pressure Sensor

    GEN III V8 ENGINE MANAGEMENT MANIFOLD ABSOLUTE PRESSURE SENSOR The Manifold Absolute Pressure (MAP) sensor measures the changes in the intake manifold pressure which result from engine load (intake manifold vacuum) and RPM changes and converts these into a voltage output.
  • Page 44 GEN III V8 ENGINE MANAGEMENT DTC P0107 Manifold Absolute Pressure Sensor Circuit Low Voltage Conditions for running DTC P0107 • No TP or ECT sensor DTCs set. • The engine is running. • The TP angle is above 20% when the engine speed is greater than 1200 RPM.

  • Page 45: Engine Coolant Temperature Sensor

    GEN III V8 ENGINE MANAGEMENT ENGINE COOLANT TEMPERATURE SENSOR The Engine Coolant Temperature (ECT) sensor is a thermistor, (a resistor that changes value based on temperature) mounted in the engine coolant stream. Low engine coolant temperature produces a high sensor resistance (29k ohms at -20°C) while high engine coolant temperature causes low sensor resistance (180 ohms at 100°C).
  • Page 46 GEN III V8 ENGINE MANAGEMENT A failure in the Engine Coolant Temperature Sensor or circuit will set one of the following DTCs: DTC P 0 1 1 7 Engine Coolant Temperature Sensor Circuit Low Voltage Conditions for running DTC P 0 1 1 7 •...
  • Page 47 GEN III V8 ENGINE MANAGEMENT DTC P 1 1 1 4 Engine Coolant Temperature Sensor Circuit Intermittent Low Voltage Conditions for running DTC P 1 1 1 4 • The engine run time is greater than 1 0 seconds. Conditions for setting DTC P 1 1 1 4 •...

  • Page 48: Intake Air Temperature Sensor

    GEN III V8 ENGINE MANAGEMENT INTAKE AIR TEMPERATURE SENSOR The Intake Air Temperature (IAT) sensor is a thermistor, (a resistor that changes resistance with changes in temperature) mounted in the air cleaner housing Of the intake system. Low intake air temperature produces high resistance in the sensor, approximately 1 0 1 k ohms at -40°C, while...
  • Page 49 GEN III V8 ENGINE MANAGEMENT A failure in the Intake Air Temperature Sensor or circuit will set one of the following DTCs: DTC P 0 1 1 2 Intake Air Temperature Sensor Circuit Low Voltage Conditions for running DTC P 0 1 1 2 •...
  • Page 50 GEN III V8 ENGINE MANAGEMENT DTC P 1 1 1 1 Intake Air Temperature Sensor Circuit Intermittent High Voltage Conditions for running DTC P 1 1 1 1 • DTCs P0101, P0102, P103, P0117, P 0 1 1 8 are not set •...

  • Page 51: Throttle Position Sensor

    GEN III V8 ENGINE MANAGEMENT THROTTLE POSITION SENSOR The Throttle Position (TP) sensor is connected to the throttle shaft on the throttle body unit. It is a potentiometer with one end connected to 5 volts from the PCM and the other end to PCM earth. A...
  • Page 52 GEN III V8 ENGINE MANAGEMENT A failure in the Throttle Position Sensor or circuit will set one of the following DTCs: DTC P0121 Throttle Position Sensor Circuit Insufficient Activity Conditions for running DTC P0121 • No MAP sensor or TP sensor DTCs set •...
  • Page 53 GEN III V8 ENGINE MANAGEMENT DTC P0123 Throttle Position Sensor Circuit High Voltage DTC P0123 Sensor Circuit Conditions for running DTC P0123 • The ignition is ON or the engine is running. Conditions for setting DTC P0123 • The TP sensor signal voltage is greater than 4.8 volts.

  • Page 54: Exhaust Gas Oxygen Sensors

    GEN III V8 ENGINE MANAGEMENT EXHAUST GAS OXYGEN SENSORS The GEN III V8 engine incorporates the use of Heated Exhaust Gas Oxygen Sensors (H02S). The oxygen sensors are the key to closed-loop fuel control. The PCM uses information from the oxygen sensors to precisely fine tune its fuel injector pulse width calculations, based on the unused, left-over oxygen content in the exhaust.
  • Page 55 GEN III V8 ENGINE MANAGEMENT The oxygen sensors are mounted in the exhaust Silica pipes and are referred to as Bank 1 Sensor 1 (left Certain RTV silicon gasket materials give off vapour exhaust pipe) Bank 2 Sensor 1 (right exhaust pipe)
  • Page 56 GEN III V8 ENGINE MANAGEMENT Four Wire Heated Oxygen Sensor Circuit A failure in the Heated Oxygen Sensors or circuits will set one of the following DTCs: DTC P0131 Heated Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 1 Conditions for running DTC P0131...
  • Page 57 GEN III V8 ENGINE MANAGEMENT DTC P0132 Heated Oxygen Sensor Circuit High Voltage Bank 1 Sensor 1 Conditions for running DTC P0132 Criteria 1 Criteria 2 • DTCs P0101, P0102, P0103, P0112, P0113, • DTCs P0101, P0102, P0103, P0112, P0113,...
  • Page 58 GEN III V8 ENGINE MANAGEMENT DTC P0134 Heated Oxygen Sensor Insufficient Activity Bank 1 Sensor 1 Conditions for running DTC P0134 • DTCs P0101,P0102, P0103, P 0 1 1 2 , P0113, P0117, P0118, P0121, P0122, P0123, P0335, P0336, P0351, P0358, P1258,are not set.
  • Page 59 GEN III V8 ENGINE MANAGEMENT DTC P0151 Heated Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 1 Conditions for running DTC P0151 Criteria 1 Criteria 2 • DTCs P0101, P0102, P0103, P0112, P0113, • DTCs P0101, P0102, P0103, P0112, P0113,...
  • Page 60 GEN III V8 ENGINE MANAGEMENT DTC P0153 Heated Oxygen Sensor (H02S) Slow Response Bank 2 Sensor 1 Conditions for running DTC P0153 • DTCs P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0335, P0336, P0351- P0358, P1258,are not set.
  • Page 61 GEN III V8 ENGINE MANAGEMENT DTC P0155 Heated Oxygen Sensor Heater Circuit Bank 2 Sensor 1 Conditions for running DTC P0155 • DTCs P0101,P0102, P0103, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0335, P0336, P0351- P0158, P1258 are not set.
  • Page 62 GEN III V8 ENGINE MANAGEMENT DTC P0172 Fuel System Rich Bank 1 Conditions for running DTC P0172 • DTCs P0101, P0102,P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0335, P0336, P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358, P 1 1 1 1 , P 1 1 1 2 , P1258,are not set.
  • Page 63 GEN III V8 ENGINE MANAGEMENT DTC P0175 Fuel System Rich Bank 2 Conditions for running DTC P0175 • DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0335, P0336, P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358, P 1 1 1 1 , P 1 1 1 2 , P1258, are not set.

  • Page 64: Knock Sensors

    To control spark knock, two knock sensors are used on the GEN III V8 engine. This system is designed to retard spark timing up to 20° to reduce spark knock in the engine. This allows the engine to use maximum spark advance to improve driveability and fuel economy.
  • Page 65 GEN III V8 ENGINE MANAGEMENT A failure in the Knock Sensors or Circuits will set one of the following DTCs: DTC P0325 Knock Sensor System Conditions for running DTC P0325 • The engine run time is greater than 20 seconds.
  • Page 66 GEN III V8 ENGINE MANAGEMENT DTC P0332 Knock Sensor Circuit Rear Sensor Conditions for running DTC P0332 • The engine run time is greater than 20 seconds. • The engine coolant temperature is greater than 70°C. • The engine speed is between 1650 and 3000 RPM.

  • Page 67: Vehicle Speed Sensor

    GEN III V8 ENGINE MANAGEMENT VEHICLE SPEED SENSOR The PCM receives vehicle speed information from the Vehicle Speed Sensor (VSS) located on the rear of the transmission. The VSS basically consists of a magnetic core and a coil. As the output shaft turns, the...
  • Page 68 GEN III V8 ENGINE MANAGEMENT A failure in the Vehicle Speed Sensor or Circuit will set on of the following DTCs: DTC P0502 Vehicle Speed Sensor Circuit Low Input Conditions for running DTC P0502 • No MAP sensor DTCs P0107 or P0108.
  • Page 69 GEN III V8 ENGINE MANAGEMENT DTC P0608 Vehicle Speed Output Circuit Conditions for running DTC P0608 • The engine speed is greater than 600 RPM • The ignition voltage is between 6.0 volts and 16.0 volts. Conditions for setting DTC P0608 •...

  • Page 70: Engine Coolant Level Switch

    GEN III V8 ENGINE MANAGEMENT ENGINE COOLANT LEVEL SWITCH The engine coolant level switch is a reed switch and is used to inform the PCM when the coolant level is at a calibrated low level. When the engine coolant is at normal operating level, the float inside...

  • Page 71: Engine Oil Pressure Sensor

    GEN III V8 ENGINE MANAGEMENT ENGINE OIL PRESSURE SENSOR The Engine Oil Pressure Sensor is screwed into the oil gallery at the top rear of the engine block. The sensor has a five volt reference voltage, an earth, and a signal circuit. The PCM monitors the voltage on the signal circuit, this voltage will vary depending on engine oil pressure.
  • Page 72 GEN III V8 ENGINE MANAGEMENT GEN III V8 ENGINE MANAGEMENT Page - 67...

  • Page 73: Air Conditioning Pressure Transducer

    GEN III V8 ENGINE MANAGEMENT AIR CONDITIONING PRESSURE TRANSDUCER The air conditioning pressure transducer is a sealed gauge reference capacitive pressure sensor with on board signal conditioning. It provides a zero to five volt output and requires a five volt regulated power supply. In operation the transducer senses applied pressure via the deflection of a two piece ceramic diaphragm with one half being a parallel plate capacitor.

  • Page 74: A/C Request Signal And A/C Clutch Control With Ecc

    GEN III V8 ENGINE MANAGEMENT A/C REQUEST SIGNAL AND A/C CLUTCH CONTROL WITH ECC The Electronic Climate Control (ECC) module requests the PCM to turn the A/C compressor clutch on or off via the PIM and the serial data bus normal mode message. The ECC module monitors information from it's sensors and switches and determines if the A/C compressor clutch should be on or off.
  • Page 75 GEN III V8 ENGINE MANAGEMENT A/C REQUEST SIGNAL AND A/C CONTROL WITHOUT ECC The BCM requests the PCM to turn the A/C compressor clutch on or off via the PIM and the serial data bus normal mode message. The BCM monitors the voltage at terminal D9 to determine the status of the momentary A/C master switch.
  • Page 76 GEN III V8 ENGINE MANAGEMENT A/C Request Signal Circuit Without ECC The PCM on receiving a request to turn on the A/C compressor, monitors the A/C pressure, coolant temperature and throttle position to determine A/C clutch operation. GEN III V8 ENGINE MANAGEMENT...
  • Page 77 GEN III V8 ENGINE MANAGEMENT A failure in the A/C Clutch Circuit will set one of the following DTCs: DTC P1539 A/C Clutch Status Circuit High Voltage The PCM activates the A/C clutch relay when the PCM detects an A/C request Voltage is present at both the...

  • Page 78: Engine Cooling Fans

    GEN III V8 ENGINE MANAGEMENT ENGINE COOLING FANS The PCM determines operation of the two speed engine cooling fans based on A/C request, A/C system pressure, engine coolant temperature and vehicle speed signal inputs. Each engine cooling fan motor has four terminals, two negative and two positive terminals.
  • Page 79 GEN III V8 ENGINE MANAGEMENT Low Speed Response The engine cooling fan Low Speed Relay is energised by the BCM. When the PCM determines that the low speed fan relay should be enabled, the PCM will send a message on the Class II serial data circuit to the PIM.
  • Page 80 GEN III V8 ENGINE MANAGEMENT A failure in the Cooling Fan Circuits will set one of the following DTCs: DTC P0481 Cooling Fan High Speed Relay Control Conditions for running DTC P0481 • The engine speed is greater than 600 RPM.

  • Page 81: Theft Deterrent Input

    GEN III V8 ENGINE MANAGEMENT THEFT DETERRENT INPUT When the ignition switch is turned from off to on, the BCM will transmit security information to the PIM via the DART serial data bus, circuit 1 2 2 1 . The PIM compares the received security information with it's stored security information and if the information matches, the PIM will enable the starter relay, and supply security information (password) via Class II Serial Data to the PCM.
  • Page 82 GEN III V8 ENGINE MANAGEMENT A failure in the Theft Deterrent System or Circuits will set one of the following DTCs: DTC P1626 Theft Deterrent System Fuel Enable Circuit Conditions for running DTC P1626 • The engine is cranking. Conditions for setting DTC P1626 •...
  • Page 83 GEN III V8 ENGINE MANAGEMENT DTC P1630 Theft Deterrent Powertrain Control Module In Learn Mode Conditions for running DTC P1630 • The PCM is in the learn password mode. Conditions for setting DTC P1630 • The PCM is ready to learn a new password from the PIM, but the PIM is not sending a valid password or not sending a password at all.
  • Page 84 GEN III V8 ENGINE MANAGEMENT TRANSMISSION FLUID PRESSURE MANUAL VALVE POSITION SWITCH ASSEMBLY This gear range sensing device called Transmission Fluid Pressure (TFP) manual valve position switch assembly is used by the PCM to sense which gear range has been selected by the vehicle operator.
  • Page 85 GEN III V8 ENGINE MANAGEMENT Page • 80 GEN III V8 ENGINE MANAGEMENT...
  • Page 86 GEN III V8 ENGINE MANAGEMENT A failure in the TFP Switch Assembly or Circuits will set the following DTCs: DTC P 1 8 1 0 TFP Valve Position Switch Circuit Conditions for running DTC P1810 • No VSS assembly DTCs P0502 or P0503 are set.

  • Page 87: Park, Reverse, Neutral, Drive, Low (Prndl) Switch

    GEN III V8 ENGINE MANAGEMENT PARK, REVERSE, NEUTRAL, DRIVE, LOW (PRNDL) SWITCH The transmission PRNDL switch is a multi-signal switch which sends signals to the PCM to indicate gear lever position, Park, Reverse, Neutral, Drive, 3, 2, or 1 . The...

  • Page 88: Check Powertrain Lamp

    GEN III V8 ENGINE MANAGEMENT CHECK POWERTRAIN LAMP The instruments receive Check Powertrain Lamp information (CPL) from the PCM via the PIM and the serial data bus normal mode message. The PCM will command the instruments to turn on the Check Powertrain Lamp for two seconds when...

  • Page 89: Ignition System

    GEN III V8 ENGINE MANAGEMENT IGNITION SYSTEM The ignition system on the GEN III V8 engine features a multiple coil ignition and is known as coil near plug. The spark plug leads are short compared with a distributor ignition system. Eight ignition coils/modules are individually mounted above each cylinder on the rocker covers and fire sequentially.
  • Page 90 GEN III V8 ENGINE MANAGEMENT GEN III V8 ENGINE MANAGEMENT Page • 85...
  • Page 91 GEN III V8 ENGINE MANAGEMENT A failure in the Ignition System Coils/Modules or Circuit will set one of the following DTCs: DTC P0351 Ignition Control #1 Circuit DTC P0352 Ignition Control #2 Circuit DTC P0353 Ignition Control #3 Circuit DTC P0354 Ignition Control #4 Circuit...

  • Page 92: Fuel System

    BASIC FUEL SYSTEM OPERATION The fuel control system used on the GEN III V8 is a "Returnless" or "Demand" system. The fuel system starts with the fuel in the fuel tank. A single in-tank high pressure fuel pump with an integrated fuel pressure regulator (located inside a modular fuel sender assembly) is used.
  • Page 93 GEN III V8 ENGINE MANAGEMENT Gerotor Fuel Pump Operation Fuel passes through the pump in two distinct stages; Vapour Separation The first fill impeller section of the pump assembly consists of an inlet body (4), impeller (6), umbrella check valve (3), and inlet plate (8). A seal (2) at the pump inlet prevents air leaks and also functions as a vibration isolator.
  • Page 94 GEN III V8 ENGINE MANAGEMENT GEN III V8 ENGINE MANAGEMENT Page - 89...
  • Page 95 GEN III V8 ENGINE MANAGEMENT Modular Fuel Sender Operation During fuelling, fuel enters the reservoir through the secondary umbrella valve (28), located in the bottom of the reservoir, and self fills to tank levels without jet pump operation When the fuel pump is off, the reservoir...
  • Page 96 GEN III V8 ENGINE MANAGEMENT Fuel Pressure Regulator The fuel pressure regulator is a diaphragm operated relief valve with fuel pump pressure on one side and atmospheric pressure combined with mechanical spring pressure on the other. The function of the regulator is to maintain a regulated pressure at the injectors at all times by controlling the flow into the return line.

  • Page 97: Fuel Pump Electrical Circuits

    GEN III V8 ENGINE MANAGEMENT FUEL PUMP ELECTRICAL CIRCUITS When the ignition switch is turned to on or crank after having been off for at least 10 seconds, the PCM will immediately energise the fuel pump relay to operate the fuel pump. This builds up the fuel pressure quickly.

  • Page 98: Fuel Injectors

    GEN III V8 ENGINE MANAGEMENT FUEL INJECTORS The fuel injectors are electrically operated fuel flow control valves. They are supplied with battery voltage from the ignition switch via fuse F14, the EFI relay and fuses F34 and F35. The injectors are controlled by the PCM providing the earth circuit.

  • Page 99: Fuel Control System

    GEN III V8 ENGINE MANAGEMENT FUEL CONTROL SYSTEM The purpose of closed loop fuel control is to control Speed Density System tailpipe emissions consisting of hydrocarbons (HC), Three specific sensors provide the PCM with the Carbon Monoxide (CO), and Oxides of Nitrogen...
  • Page 100 GEN III V8 ENGINE MANAGEMENT HOLOEN Sequential Fuel Injection Mode Deceleration Mode When the engine is first cranked over, all injectors When the driver releases the accelerator pedal, air will be energised simultaneously. After the engine flow into the engine is reduced. The PCM looks at...
  • Page 101 GEN III V8 ENGINE MANAGEMENT In closed loop mode, the PCM initially calculates At this time the PCM will switch from open loop to injector pulse width based on the same sensors closed loop and the STFT will start to constantly...
  • Page 102 GEN III V8 ENGINE MANAGEMENT Long Term Fuel Trim Long Term Fuel Trim Cell LTFT is used to adjust for engine to engine The LTFT function of the PCM is divided up into cells 0-22 arranged by MAP sensor readings and...

  • Page 103: Electronic Traction Control

    GEN III V8 ENGINE MANAGEMENT ELECTRONIC TRACTION CONTROL When the ABS/ETC control module senses spin from the drive wheels due to too much engine torque for the road conditions, it enters the traction control mode. The ABS/ETC module monitors both front and rear wheel speeds through the wheel speed sensors. If at any time during acceleration the ABS/ETC module detects drive wheel slip, it will request: •...
  • Page 104 GEN III V8 ENGINE MANAGEMENT GEN III V8 ENGINE MANAGEMENT Page - 99...

  • Page 105: Idle Air Control Valve

    GEN III V8 ENGINE MANAGEMENT IDLE AIR CONTROL VALVE The purpose of the Idle Air Control (IAC) valve, is to control engine idle speed, and prevent engine stalling due to changes in engine load at idle. The IAC valve, mounted in the throttle body, controls bypass air around the throttle valve.
  • Page 106 GEN III V8 ENGINE MANAGEMENT The following DTCs will set if the PCM detects an engine speed outside the lAC's operating range. DTC P0506 Idle Speed Low Conditions for running DTC P0506 • DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0171, P0172, P0174, P0175, P0443,are not set.

  • Page 107: Evaporative Emission Control System

    GEN III V8 ENGINE MANAGEMENT EVAPORATIVE EMISSION CONTROL SYSTEM The Evaporative Emission Control System (EECS) captures fuel vapours, which would normally escape from the fuel tank and enables them to be consumed in the combustion process. The EECS is the charcoal canister storage method. This...
  • Page 108 GEN III V8 ENGINE MANAGEMENT A failure in the Evaporative Canister Purge Solenoid or Circuit will set the following DTC: DTC P0443 EVAP Purge Solenoid Control Circuit Conditions for running DTC P0443 • The engine speed is greater than 400 RPM.

  • Page 109: Reverse Inhibit Solenoid

    GEN III V8 ENGINE MANAGEMENT REVERSE INHIBIT SOLENOID The manual transmission is fitted with a reverse inhibit mechanism that prevents the selection of reverse gear, above road speeds of 8 km/h. If the engine is running and the vehicle speed is less than 8 km/h the reverse inhibit solenoid ( 1 ) is energised by the PCM, pulling the solenoid plunger (2) down, this allows the reverse lockout plunger (3) to move, enabling selection of reverse gear.

  • Page 110: Tech 2 Test Modes And Displays For Pcm Diagnosis

    TECH 2 functions and provide a brief explanation of their operation for diagnosing the PCM. Once GEN III V8 has been selected the following functions are available: FO: Diagnostic Trouble Codes In this test mode, DTCs stored by the PCM maybe displayed or cleared. When FO: Diagnostic Trouble Codes an there are an additional four modes: FO: Read DTC Info Ordered By Priority: DTC(s) will be displayed in numerical order.
  • Page 111 GEN III V8 ENGINE MANAGEMENT F3: Miscellaneous Tests In this test mode, the Tech 2 scan tool performs software override commands of the PCM, to assist in problem isolation during diagnostics. FO: Output Tests FO: Fuel Pump: Fuel Pump Relay can be commanded on and off.

  • Page 112: Service Programming System

    BCM LINK TO PCM/PIM / select applicable engine and follow TECH 2 instructions. NOTE: On vehicles with a GEN III V8 engine it will be necessary to obtain TIS approval during the linking procedure. When instructed to obtain TIS approval by TECH 2, use the following procedure: •...
  • Page 113 GEN III V8 ENGINE MANAGEMENT NOTES Page • 108 GEN III V8 ENGINE MANAGEMENT...

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