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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 ,
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.
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.
Ignition signal - Bad
Igniter, Ignition Coil, Ignition
switch, Cam Position
sensor, Ignition Main relay,
Main relay, Integrated
Ignition Assembly (IIA) or
Cam position sensor. Faulty
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 ,
Igniter & circuit - Bad
Igniter or Ignition switch.
Faulty Distributor. Wiring
associated with these parts.
Electronic Controlled
Transaxle (ECT) system -
Bad ECT program (in ECU).
Main Oxygen (O
) sensor
2
signal - Leak in Air
Induction system. Bad Spark
Plugs, Fuel Injector(s), Cold
Start Injector, Air Flow
meter, O
sensor or O
2
sensor Heater. Improper
Fuel pressure. Faulty
Distributor or Ignition
system. Wiring associated
with these parts.
or ,
Oxygen (O
) sensor signal
2
- Air suction into Exhaust
system. Leak in Air Induction
system or Air Intake system.
Bad Spark Plug(s), Vacuum
sensor, O
sensor(s), O
2
sensor Heater 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.
or ,
Oxygen (O
) sensor No.1
2
signal - Air suction into
Exhaust system. Air Intake
system leak. 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 pressure. Faulty Ignition
system or Distributor. Wiring
associated with these parts.
Coolant Temperature
sensor signal - Bad Water
(Coolant) Temperature
sensor or faulty sensor
wiring.
or ,
Coolant Temperature
Switch signal - Bad Water
(Coolant) Temperature
switch(s) or faulty switch
wiring.
Throttle Position sensor
signal - Bad Throttle
Position sensor or faulty
sensor wiring.
or ,
2
Intake Air Temperature
sensor - Bad Intake Air
Temperature sensor, Main
relay or faulty sensor/relay
wiring.
Intake Air Temperature
sensor signal - Bad Air
Temperature sensor, Air
Flow meter or faulty sensor/
2
meter wiring.
or ,
Air Temperature sensor
circuit - Bad Air
Temperature sensor, Air
Flow meter or faulty sensor/
meter wiring.
Lean Air/Fuel mixture - Bad
or blocked Fuel Injector(s).
Bad Coolant Temperature
sensor, Air Flow meter,
Vacuum sensor, Electronic
Air Bleed Control Valve
2
(EBCV), Electronic Air
Control Valve (EACV) or O
sensor. Improper Fuel line
pressure. Faulty Carburetor,
2
25
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