Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 2. This step determines if DTC P0183 is a hard failure or an intermittent condition.
2. 3. This test simulates a DTC P0182. If the PCM recognizes the low signal voltage (high temp) the PCM and the wiring are OK.
3. 4. This test will determine if the signal circuit is open. There should be 5 volts at the sensor connector if measured with a DMM. This will determine if there is a wiring problem or a malfunctioning PCM.
4. 9. This step determines if there is a short to voltage on the signal circuit. A short to voltage increases the current flow through the sensor which overwhelms the sensor. This does not allow the sensor to pull down the circuit to the correct voltage and thus display the correct temperature.
5. 10. After repairing the short to voltage, check the sensor for proper operation.

Fig 1: DTC P0183 (Steps 1-3)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P0183 (Steps 4-15)

Courtesy of GENERAL MOTORS CORP.