Fail-Safe/Backup Function (Limp-In Mode)

When the PCM detects the following malfunction(s), the PCM carries out fail safe/back-up control. In addition, the corresponding DTC number(s) can be identified by using the scan tool.

No cam signal at PCM
- The PCM uses the crankshaft position sensor signal only to control fuel injection timing, etc. (Accordingly, normal sequential multiport fuel injection may not be carried out.)

Throttle position sensor voltage low
- The PCM uses the value calculated from the MAP sensor signal instead of the throttle valve opening angle (voltage).

Throttle position sensor voltage high
- The PCM uses the value calculated from the MAP sensor signal instead of the throttle valve opening angle (voltage).

Engine coolant temperature (ECT) sensor voltage too low
- The PCM uses the default value [°C (°F)] as the engine coolant temperature.
- The PCM operates the radiator fan.
- The PCM carries out open loop control.

Engine coolant temperature (ECT) sensor voltage too high
- The PCM uses the default value [°C (°F)] as the engine coolant temperature.
- The PCM operates the radiator fan.
- The PCM carries out open loop control.

No vehicle speed sensor signal
- The PCM controls the engine as if the vehicle speed were 0 mph.

MAP sensor voltage too low
- The PCM uses the value calculated from the throttle position sensor and the engine speed signals instead of the MAP value (mV).

MAP sensor voltage too high
- The PCM uses the value calculated from the throttle position sensor and the engine speed signals instead of the MAP value (mV).

No change in MAP from start to run
- The PCM uses the value calculated from the throttle position sensor and the engine speed signals instead of the MAP value (mV).

Intake air temperature sensor voltage low
- The PCM uses the engine coolant temperature instead of the intake air temperature.

Intake air temperature sensor voltage high
- The PCM uses the engine coolant temperature instead of the intake air temperature.

Throttle position sensor voltage does not agree with MAP
- The PCM uses the value calculated from the MAP sensor signal instead of the throttle valve opening angle (voltage).

Timing belt skipped 1 tooth or more
- The PCM uses the crankshaft position sensor signal only to control fuel injection timing, etc. (Accordingly, normal sequential multiport fuel injection may not be carried out.)

Intermittent loss of camshaft position or crankshaft position
- The PCM uses the crankshaft position sensor signal only to control fuel injection timing, etc. (Accordingly, normal sequential multiport fuel injection may not be carried out.)