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System Normal - No
malfunction.
Airflow meter (AFM) signal
- Bad Airflow meter, Main
relay, EFI Main relay, or
faulty meter/relay wiring.
Ignition signal - Bad Igniter,
Ignition coil, Ignition switch,
Cam Position sensor,
Ignition Main relay,
Integrated Ignition Assembly
(IIA), Cam Position sensor or
Distributor. Wiring
associated with these parts.
Coolant Temperature
sensor signal - Bad Water
(Coolant) Temperature
sensor, Main relay or faulty
sensor/relay wiring.
Oxygen (O
) sensor signal
2
- Air suction into Exhaust
system. Leak in Air Induction
system or Air Intake system.
Bad or fouled Spark Plug(s).
Bad 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
pressure. Faulty Ignition
system or Distributor. Wiring
associated with these parts.
RPM signal - Bad Igniter,
Ignition Coil, Ignition switch,
Cam Position sensor,
Ignition Main relay,
Integrated Ignition Assembly
(IIA), Cam position sensor or
Distributor. Wiring
associated with these parts.
Throttle Position Sensor
(TPS) signal - Bad Throttle
Position sensor, Main relay,
Electronic Fuel Injection
24
(EFI) Main relay, or faulty
sensor/relay wiring.
Intake Air Temperature
sensor signal - Bad Air
Temperature sensor, Air
Flow meter, Main relay or
faulty sensor/meter/relay
wiring.
Starter signal - Bad Starter,
Battery, Ignition switch,
Clutch switch, Clutch Start
switch, Clutch Starter relay,
Starter relay, Main relay,
Neutral/Start switch or faulty
wiring associated with these
parts.
Electronic Control Unit
(ECU) Power supply (B+) -
Bad Electronic Fuel Injection
(EFI) relay, EFI Main relay,
Main relay, Ignition switch or
faulty relay/switch wiring.
or ,
Switch signal - Bad Air
Conditioning (A/C) switch, A/
C Amplifier, Neutral/Start
switch, Throttle Position
sensor, Accelerator pedal or
2
Accelerator Pedal cable.
Faulty Throttle Position
sensor IDL circuit. Wiring
associated with these parts.
or ,
Main Relay & circuit - Bad
Main relay, Electronic Fuel
Injection (EFI) Main relay,
Ignition switch or faulty relay/
switch wiring.
RPM signal - Bad Cam
Position sensor, Igniter,
Ignition coil, Battery, Ignition
switch, Clutch start switch,
Neutral start switch, Starter
relay or Integrated Ignition
Assembly (IIA). Missing
Starter (STA) signal. Loss of
signal from Distributor to
ECU. Faulty Distributor or
Ignition system components.
Wiring associated with these
parts.
or ,
Knock sensor signal - Bad
Knock sensor or faulty
sensor wiring.
RPM signal - Bad Cam
Position sensor, Igniter,
Ignition coil, Battery, Ignition
switch, Clutch start switch,
Neutral start switch, Starter
relay or Integrated Ignition
Assembly (IIA). Missing
Starter (STA) signal. Loss of
signal from Distributor to
ECU or faulty Distributor.
Faulty Ignition system
components. Wiring
associated with these parts.
or ,
Knock sensor Control -
Bad Knock sensor control
(ECU) or faulty sensor
wiring.
Ignition signal - Bad
Igniter, Ignition Coil, Ignition
switch, Cam Position
sensor, Ignition Main relay,
Main relay, Integrated
Ignition Assembly (IIA), Cam
position sensor or
Distributor. Wiring
associated with these parts.
or ,
RPM signal - Bad Cam
Position sensor, Igniter,
Ignition switch or Integrated
Ignition Assembly (IIA).
Faulty Distributor. Wiring
associated with these parts.
or ,
Turbo Pressure - Bad Air
Flow meter. Faulty
Turbocharger. Wiring
associated with these parts.
or ,
Igniter & circuit - Bad
Igniter or Ignition switch.
Faulty Distributor. Wiring
associated with these parts.
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