Jeep Grand Cherokee WK. Manual — part 915
P0197-ENGINE OIL TEMPERATURE SENSOR CIRCUIT LOW
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0197-ENGINE OIL TEMPERATURE SENSOR CIRCUIT LOW (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 less than the calibrated amount. One Trip
Fault. Three good trips to clear the MIL.
Possible Causes
(G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO GROUND
(G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
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)
2.
ENGINE OIL TEMPERATURE SENSOR
Turn the ignition off.
Disconnect the Engine Oil Temp Sensor harness connector.
Ignition on, engine not running.
With a scan tool, read Engine Oil Temp voltage.
Is the voltage above 1.0 volt?
Yes
>> Replace the Engine Oil Temp Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
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ENGINE ELECTRICAL DIAGNOSTICS
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P0197-ENGINE OIL TEMPERATURE SENSOR CIRCUIT LOW (CONTINUED)
3.
(G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
Turn the ignition off.
Disconnect the C2 and C3 PCM harness connectors.
Measure the resistance between the (K900) Sensor ground circuit and
the (G224) Engine Oil Temp Signal circuit in the Engine Oil Temp Sen-
sor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short to between the (K900) Sensor ground cir-
cuit and the (G224) Engine Oil Temp Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED GROUND
Measure the resistance between ground and the (G224) Engine Oil
Temp Signal circuit in the Engine Oil Temp Sensor harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (G224) Engine Oil Temp
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
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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P0198-ENGINE OIL TEMPERATURE SENSOR CIRCUIT HIGH
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ENGINE ELECTRICAL DIAGNOSTICS
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