P0198-ENGINE OIL TEMPERATURE SENSOR CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts.
Set Condition:
The Engine Oil Temperature sensor circuit voltage at the PCM is greater than the calibrated amount. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes

(G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

(G224) ENGINE OIL TEMP SIGNAL CIRCUIT OPEN

(K900) SENSOR GROUND CIRCUIT OPEN

ENGINE OIL TEMPERATURE SENSOR

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Diagnostic Test

1.ACTIVE DTC

IS the DTC Active at this time?

Yes

Go To 2

Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

2.ENGINE OIL TEMP SENSOR

Does the P0197-ENGINE OIL TEMPERATURE SENSOR CIRCUIT LOW DTC set?

Yes

Replace the Engine Oil Temp Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 3
NOTE: Remove the jumper wire before continuing.

3.(G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Is the voltage above 5.2 volts?

Yes

Repair the short to battery voltage in the (G224) Engine Oil Temp Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Go To 4

4.(G224) ENGINE OIL TEMP SIGNAL CIRCUIT OPEN

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Is the resistance below 5.0 ohms?

Yes

Go To 5

Repair the open in the (G224) Engine Oil Temp Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

5.(K900) SENSOR GROUND CIRCUIT OPEN

Is the resistance below 5.0 ohms?

Yes

Go To 6

Repair the open in the (K900) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

6.PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Were there any problems found?

Yes

Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)