23
EFI Codes
Electronic Fuel Injection system
1
System Normal -
No malfunction.
2
Airflow meter (AFM) signal
- Bad Airflow meter, Main
relay, EFI Main relay, or
associated meter/relay
wiring.
3
Airflow meter (AFM) - Bad
Airflow meter or meter
wiring.
4
Coolant Temperature
sensor signal - Bad Water
(Coolant) Temperature
sensor, Main relay or
associated sensor/relay
wiring.
5
Oxygen (O
2
) sensor signal
- Air suction into Exhaust
system. Leak in Air Induction
system or Air Intake system.
Bad or fouled Spark Plug(s).
Bad Vacuum sensor, O
2
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, Distributor. Wiring
associated with these parts.
6
Ignition signal - Bad
Ignition coil, Battery, Ignition
switch, Neutral/start switch
or Integrated Ignition
Assembly (IIA). Missing
Starter (STA) signal. Loss of
signal from Distributor to
ECU. Faulty Distributor,
Ignition System components.
Wiring associated with these
parts.
7
Throttle Position Sensor
(TPS) signal - Bad Throttle
Position sensor, Main relay,
Electronic Fuel Injection
(EFI) Main relay, or faulty
sensor/relay wiring.
8
Intake Air Temperature
sensor signal - Bad Air
Temperature sensor, Air
Flow meter, Main relay or
faulty sensor/meter/relay
wiring.
TOYOTA
Summary of Contents for Code Scanner CP9025
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