DTC EFI-143

1-4-3 FRONT KNOCK SENSOR SIGNAL





Trouble Code Condition(s)
- If engine coolant temperature (ECT) exceeds +40°C (+104°F),engine speed exceeds 2,500 rpm, load exceeds 3.0 ms and the signal from the knock sensor (KS) is missing for 4 seconds the diagnostic trouble code (DTC) for that knock sensor is stored.

Substitute value(s)
- Knock control is disabled.
- Ignition advance reduced for safety reasons.

Possible source(s)
- Short-circuit to ground in signal cable.
- Open-circuit in signal cable or ground lead.
- Contact resistance in terminals.
- Defective knock sensor.

Fault symptom(s)
- Poor performance due to retarded ignition.