Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition
The control module controls preheating by pulsing the current to the PTC-element. The length of the pulses depend on the temperature of the heated oxygen sensor (H02S). Diagnostic trouble code (DTC) ECM-2910 is stored if the control module registers that the signal is a constant 2.5 V, higher than 3.5 V at current pulse or lower than 2.3 V at no current pulse.
Diagnostic trouble code (DTC) ECM-2910 is stored if the control module registers that heated oxygen sensor pre-heating does not function within 17 seconds of dew (condensation) point in the exhaust system being reached.

Substitute value
- fuel trim is shut off.

Possible source

Signal too high:
- short-circuit to supply voltage in the signal cable
- defective heated oxygen sensor (HO2S).

Signal too low:
- short-circuit to ground in the signal cable
- defective heated oxygen sensor (HO2S).

Signal missing:
- contact resistance and oxidation
- open-circuit in the power supply from the system relay.

Faulty signal:
- defective heated oxygen sensor (HO2S).

Fault symptom[s]
- The malfunction indicator lamp (MIL) lights.