Multiple PCM Information Sensor DTC's Set

Multiple PCM Information Sensor DTC's Set

Circuit Description
The powertrain control module (PCM) monitors various sensors to determine the engine operating conditions. The PCM controls fuel delivery, spark advance, transmission operation, and emission control device operation based on the sensor inputs.
The PCM provides a sensor ground to all of the sensors. The PCM applies 5 volts through a pull-up resistor, and determines the status of the following sensors by monitoring the voltage present between the 5-volt supply and the resistor:
- The engine coolant temperature (ETC) sensor
- The intake air temperature (IAT) sensor
- The transmission fluid temperature (TFT) sensor

The PCM provides the following sensors with a 5-volt reference and a sensor ground signal:
- The exhaust gas recirculating (EGR) pintle position sensor
- The throttle position (TP) sensor
- The manifold absolute pressure (MAP) sensor

The PCM monitors the separate feedback signals from these sensors in order to determine their operating status.

Diagnostic Aids

IMPORTANT: Be sure to inspect PCM and engine grounds for being secure and clean.

A short to voltage in one of the sensor input circuits may cause one or more of the following DTCs to be set:
- P0108/P1106
- P0113/P1111
- P0118/P1115
- P0123/P1121
- P0560
- P0712

IMPORTANT: If a sensor input circuit has been shorted to voltage, ensure that the sensor is not damaged. A damaged sensor will continue to indicate a high or low voltage after the affected circuit has been repaired. It the sensor has been damaged, replace it.

An open in the sensor ground circuit between the PCM and the splice will cause one or more of the following DTCs to be set:
- P0108/P1106
- P0113/P1111
- P0118/P1115
- P0123/P1121
- P0712

A short to ground in the 5-volt reference A or B circuit will cause one or more of the following DTCs to be set:
- P0107/P1107
- P0122/P1122
- P1406

An open in the in the 5-volt reference circuit A, between the PCM and the splice will cause one or more of the following DTCs to be set:
- P0122/P1122
- P1406

An open in the in the 5-volt reference circuit B, between the PCM and the splice will cause one or more of the following DTCs to be set:
- P0107/P1107

Check for the following conditions:
- Poor connection at PCM. Inspect the harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damage terminals, and a poor terminal-to-wire connection.
- Damaged harness. Inspect the wiring harness for damage. lithe harness is not damaged, observe an affected sensor's displayed value on the scan tool with the ignition ON and the engine OFF while you move the connectors and the wiring harnesses related to the following sensors:
- IAT
- ECT
- TP
- MAP
- EGR
- TFT

Steps 1 - 3:

Steps 4 - 11:

Steps 12 - 20:

Test Description
9. A faulty EGR valve can leak a small amount of current from the ignition feed circuit to the 5-volt reference A circuit. If the problem does not exist with the EGR valve disconnected, replace the EGR valve.
11-15. If a sensor input circuit has been shorted to voltage, ensure that the sensor has not been damaged. A damaged IAT or ECT sensor will continue to indicate a high voltage or a low temperature after the affected circuit has been repaired. A damaged TP, MAP, fuel tank pressure, or EGR pintle position sensor will indicate a high voltage, a low voltage, or a fixed value after the affected circuit has been repaired. If the sensor has been damaged, replace it.