Powertrain Controls - ECM/PCM

Circuit Schematic:

PCM FAULT-PULL-UP RESISTOR
The PCM uses a pull-up resistor to increase resolution throughout the entire range of engine operating temperatures. When the coolant temperature is less than 40°C (104°F) the 4K ohm resistor is used. When temperature is above 40°C (104°F) the PCM switches to the 348 ohm resistor. If the pull-up resistor does not switch DTC 17 will set.

DTC PARAMETERS

DTC 17 will set if:
^ The pull-up resistor inside the PCM switches and there is no change in the coolant temperature signal.

DIAGNOSTIC AIDS
DTC 17 is an internal fault within the PCM. The PCM must be replaced.