Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




Diagnostic trouble code (DTC) ECM-8A is stored if there is a short-circuit to supply voltage in the idle air control (IAC) valve signal cable or if there is an open-circuit in the circuit that the control module interprets as a fault.

Substitute value
The conditions for fuel shut-off are changed.

Possible source

Signal too high:
- Short-circuit to supply voltage in the signal cable
- Faulty idle air control (IAC) valve.

Signal too low:
- Short-circuit to ground in the signal cable
- Faulty idle air control (IAC) valve.

Signal missing:
- Open-circuit in the signal cable:
- Faulty idle air control (IAC) valve.

Fault symptom[s]
- High idling speed
- Low idling speed
- Malfunction indicator lamp (MIL) lit.