Suzuki XL7 2007 Service Manual page 170

1A-65 Engine General Information and Diagnosis:
Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
DTC Type Reference
"Powertrain Diagnostic Trouble Code (DTC) Type
Definitions"
Scan Tool Reference
• "Scan Tool Data List - Engine Controls - 3.6L (LY7)"
• "Scan Tool Data Definitions - Engine Controls - 3.6L
(LY7)"
• "Scan Tool Output Controls - Engine Controls - 3.6L
(LY7)"
Circuit/System Verification
Engine idling at operating temperature for at least 30
seconds. Observe the DTC information, DTCs P0030,
P0031, P0032, P0036, P0037, P0038, P0050, P0051,
P0052, P0056, P0057, and P0058 should not set.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at
the appropriate heated oxygen sensor (HO2S).
2. Ignition ON, verify that a test lamp illuminates
between the ignition circuit terminal C and ground.
NOTE
The ignition circuit supplies voltage to other
components. Make sure you test all circuits
for a short to ground or test all components
for being shorted that share the ignition
circuit.
➢ If the test lamp does not illuminate, test the ignition
circuit for a short to ground or an open/high
resistance. If the circuit tests normal and the
ignition circuit fuse is open, test all the components
connected to the ignition circuit and replace as
necessary.
3. Connect a test lamp between the heater control
circuit terminal D and B+. The test lamp should not
illuminate.
➢ If the test lamp is always ON, test the control circuit
for a short to ground. If the circuit/connections test
normal, replace the ECM.
NOTE
The control circuit for the HO2S heater is
pulled-up to voltage within the ECM, 2.0-3.0
volts on the control circuit is normal.
4. Idle the engine, and verify the test lamp illuminates
or flashes.
➢ If the test lamp is always OFF, test the control
circuit for an open/high resistance. If the circuit/
connections test normal, replace the ECM.
5. Ignition ON, test for 2.0-3.0 volts between the control
circuit terminal D and ground.
➢ If not within the specified range, test the control
circuit for a short to voltage. If the circuit/
connections test normal, replace the ECM.
6. If all circuits/connections test normal, test or replace
the HO2S sensor.
Component Testing
1. Ignition OFF, disconnect the harness connector at
the heated oxygen sensor (HO2S) sensor.
2. Test the HO2S heater resistance for 3-35 ohms.
➢ If the resistance is out of the specified range,
replace the HO2S sensor.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Heated Oxygen Sensor Replacement - Bank 1
Sensor 1: "
• "Heated Oxygen Sensor Replacement - Bank 1
Sensor 2: "
• "Heated Oxygen Sensor Replacement - Bank 2
Sensor 1: "
• "Heated Oxygen Sensor Replacement - Bank 2
Sensor 2: "
• "Control Module References: " for engine control
module replacement, setup, and programming