Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-P003700

Condition




Engine Control Module (ECM) checks if the rear heated oxygen sensor's preheating circuit (bank 1) is short-circuited to voltage, there is an open circuit or if the resistance in the heating resistor is incorrect.
The engine cylinders are counted from the cylinder furthest away from the flywheel.
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers any of these.
The diagnostic trouble code (DTC) can be diagnosed at ignition on and if the battery voltage is in the range 11-16 V.

Substitute value
- Rear heated oxygen sensor (HO2S) preheating shut off.

Possible source
- Contact resistance, oxidation in the terminals.
- Short-circuit to ground in the power cable.
- Open-circuit in the power supply cable.
- Damaged rear heated oxygen sensor (HO2S).

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.