P1670

Diagnostic Chart:

Wiring Diagram:

The quad driver module (QDM) has fault detection logic which compares QDM driver input and output voltages. The logic expects to measure less than 3 volts when the QDM driver is On and greater than 7 volts when Off. The QDM has only one fault line that will detect a fault on either of the two outputs.

DTC PARAMETERS
DTC P1670 and/or P1671 will set if there is an open, short to ground or short to voltage on either the air pump relay or air pump solenoid circuits.

If a fault is detected for 5 seconds, P1671 will set. If a fault is detected for 20 seconds, P1670 will set.

The QDM is continuously checked when the engine is running.

DIAGNOSTIC AIDS
If one output is bad, the PCM will shut down only that QDM output and not the entire quad driver, unless it reaches its thermal limit (short to voltage). If the thermal limit is reached, it will turn off both outputs. When the quad driver cools back down, it will turn back on and this process will start over.