Jeep Grand Cherokee WK. Manual — part 916
P0198-ENGINE OIL TEMPERATURE SENSOR CIRCUIT HIGH (CONTINUED)
For the Engine System Schematic circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
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
Ignition on, engine not running.
With a scan tool, read DTCs.
IS the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0198-ENGINE OIL TEMPERATURE SENSOR CIRCUIT HIGH (CONTINUED)
2.
ENGINE OIL TEMP SENSOR
Turn the ignition off.
Disconnect the Engine Oil Temp Sensor harness connector.
Connect a jumper wire between the (G224) Engine Oil Temp Signal
circuit and the (K900) Sensor ground circuit in the Engine Oil Temp
Sensor harness connector.
Ignition on, engine not running.
With a scan tool, read Engine Oil Temp voltage.
Is the voltage below 1.0 volt with the jumper wire installed?
Yes
>> Replace the Engine Oil Temp Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
NOTE: Remove the jumper wire before continuing.
3.
(G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C2 and C3 PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (G224) Engine Oil Temp Signal circuit in
the Engine Oil Temp Sensor harness connector.
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)
No
>> Go To 4
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ENGINE ELECTRICAL DIAGNOSTICS
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P0198-ENGINE OIL TEMPERATURE SENSOR CIRCUIT HIGH (CONTINUED)
4.
(G224) ENGINE OIL TEMP SIGNAL CIRCUIT OPEN
Turn the ignition off.
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.
Measure the resistance of the (G224) Engine Oil Temp Signal circuit
from the Engine Oil Temp Sensor harness connector to the appropri-
ate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (G224) Engine Oil Temp Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
5.
(K900) SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (K900) Sensor ground circuit from the
Engine Oil Temp Sensor harness connector to the appropriate terminal
of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (K900) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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P0198-ENGINE OIL TEMPERATURE SENSOR CIRCUIT HIGH (CONTINUED)
6.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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