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.