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Injector circuit, Ignition
system, Air Intake system,
Exhaust Gas Recirculation
(EGR) system, EGR Vacuum
lines or Engine ground.
Wiring associated with these
parts.
or ,
Oxygen (O
) sensor circuit
2
- Bad or blocked Fuel
Injector(s). Leak in Air
Induction system. Bad Air
Flow meter, O
sensor or
2
Spark Plug(s). Improper Fuel
line pressure. Faulty Ignition
system or Distributor. Wiring
associated with these parts.
Rich Air/Fuel mixture - Bad
or leaking Fuel Injector(s) or
Cold Start Injector. Bad
Coolant Temperature
sensor, Air Flow meter,
Vacuum sensor, Electronic
Air Bleed Control Valve
(EBCV) or O
sensor.
2
Improper Fuel line pressure
or Compression pressure.
Short in Injector circuit.
Faulty Ignition system,
Carburetor or Engine
ground. Wiring associated
with these parts.
or ,
Oxygen (O
) sensor circuit
2
- Bad or blocked Fuel
Injector(s). Bad Air Flow
meter, O
sensor, Cold Start
2
Injector or Spark Plugs.
Improper Fuel line pressure.
Leak in Air Induction system.
Faulty Injector circuit,
Ignition system, Distributor
or Air Induction system.
Wiring associated with these
parts.
Oxygen (O
) sensor signal
2
- Air suction into Exhaust
system. Leak in Air Induction
system or in Air Intake
system. Bad Spark Plug(s),
Vacuum sensor, O
2
sensor(s), O
sensor Heater,
2
Air Flow meter, Cam
Position sensor, Integrated
Ignition Assembly (IIA), Fuel
Injector(s) or Cold Start
Injector. Improper Fuel line
pressure. Faulty Ignition
system or Distributor. Wiring
associated with these parts.
or ,
26
Sub Oxygen (O
) sensor
2
signal - Air suction into
Exhaust system, Leak in Air
Induction system or in Air
intake system. Bad Spark
Plug(s), Vacuum sensor, O
sensor(s) or O
sensor
2
Heater, Integrated Ignition
Assembly (IIA), Air Flow
meter, Fuel Injector(s) or
Cold Start Injector. Improper
Fuel line pressure. Faulty
Ignition system or
Distributor. Wiring
associated with these parts.
Main Oxygen (O
) sensor
2
signal - Air suction into
Exhaust system. Leak in Air
Intake system. Bad Spark
Plug(s) Vacuum sensor, O
sensor(s), O
sensor Heater,
2
Air Flow meter, Fuel
Injector(s) or Cold Start
Injector. Improper Fuel line
pressure. Faulty Ignition
system or Distributor. Wiring
associated with these parts.
or ,
Oxygen sensor No. 2
signal - Air suction into
Exhaust system. Leak in Air
Induction system or in Air
Intake system. Bad Spark
Plug(s), Vacuum sensor, O
sensor(s), O
sensor Heater,
2
Integrated Ignition Assembly
(IIA), Air Flow meter, Fuel
Injector(s), Cold Start
Injector or Cam Position
sensor. Improper Fuel line
pressure. Faulty Distributor
or Ignition system. Wiring
associated with these parts.
Vacuum sensor signal -
Bad Vacuum sensor or
faulty sensor wiring.
or ,
Vacuum switch signal -
Bad Vacuum switch(s). Bad
or out of adjustment Throttle
Position (TPS) switch. Faulty
Vacuum line(s) or switch/
sensor wiring.
or ,
Airflow meter signal - Bad
Airflow meter, Main relay or
faulty meter/relay wiring.
Airflow meter signal - Bad
Airflow meter or faulty meter
wiring.
or ,
2
High Altitude
Compensator (HAC) - Bad
HAC or faulty circuit.
Turbocharger Pressure
sensor - Bad Turbocharger
Pressure sensor or Airflow
meter. Faulty Intercooler
system, Turbocharger or
sensor/meter wiring.
Turbocharger Pressure
sensor - Bad Turbocharger
Pressure sensor or faulty
sensor wiring.
2
or,
High Altitude
Compensator (HAC) - Bad
HAC or faulty circuit.
Throttle Position sensor
(TPS) signal - Bad Throttle
Position sensor, Main relay,
EFI Main relay or faulty
sensor/relay wiring.
or ,
Throttle Position switch
2
(TPS) signal - Bad or out of
adjustment Throttle Position
switch or faulty switch
wiring.
Vehicle Speed sensor
signal - Bad Vehicle Speed
sensor, No.1 Speed Sensor
or faulty sensor wiring.
Starter signal - Bad Starter,
Battery, Ignition switch,
Clutch switch, Clutch Start
switch, Clutch Starter relay,
Neutral Start switch, Starter
relay or Main relay. Wiring
associated with these parts.
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