P0197-ENGINE OIL TEMPERATURE SENSOR CIRCUIT LOW
P0197-ENGINE OIL TEMPERATURE SENSOR CIRCUIT LOW
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For a complete wiring diagram, refer to the Wiring Information.
Thoery of operation
The oil temperature sensor is a variable resistor that measures the temperature of the engine oil. The Powertrain Control Module (PCM) supplies a 5-volt reference and a ground to the sensors low reference signal circuit. When the oil temperature is low, the sensor resistance is high. When the oil temperature is high, the sensor resistance is low.
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When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts.
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Set Condition:
The Engine Oil Temperature sensor circuit voltage at the Powertrain Control Module (PCM) is less than the calibrated amount. One Trip Fault. Three good trips to clear the MIL.
Possible Causes |
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| (G24) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO GROUND |
| (G24) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND |
| ENGINE OIL TEMPERATURE SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Start the engine and allow it to reach normal operating temperature. |
When the engine is operating, do
not stand in direct line with the fan. Do not put your hands near
the pulleys, belts or fan. Do not wear loose clothing. Failure to
follow these instructions may result in possible serious or fatal
injury.
WARNING:
| NOTE: | Diagnose and repair any system voltage DTCs before continuing with this test. |
| 2. | With the scan tool, select View DTCs. |
Is the DTC Active at this time?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. ENGINE OIL TEMPERATURE SENSOR
| 1. | Turn the ignition off. |
| 2. | Disconnect the Engine Oil Temp Sensor harness connector. |
| 3. | Ignition on, engine not running. |
| 4. | With the scan tool, read Engine Oil Temp voltage. |
| NOTE: | The sensor voltage should be approximately 5.0 volts (plus or minus .1 volt) with the connector disconnected. |
Does the scan tool display the voltage as described above?
Yes
- Verify that there is good pin to terminal contact in the Engine Oil Temperature Sensor and Powertrain Control Module connectors. Replace the Engine Oil Temperature Sensor if no problems were found with the connectors. (Refer to 09 - Engine/Lubrication/SENSOR, Oil Temperature - Removal) .
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Go To 3
3. (G24) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
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| 1. | Turn the ignition off. |
| 2. | Disconnect PCM C2 harness connector. |
| 3. | Measure the resistance between the (K900) Sensor ground circuit and the (G24) Engine Oil Temp Signal circuit in the Engine Oil Temp Sensor harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Repair the short to between the (K900) Sensor ground circuit and the (G24) Engine Oil Temp Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
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Go To 4
4. (G24) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED GROUND
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| 1. | Measure the resistance between ground and the (G24) 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 (G24) Engine Oil Temp Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
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Go To 5
5. POWERTRAIN CONTROL MODULE (PCM)
| 1. | Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Oil Temperature Sensor and the Powertrain Control Module (PCM). |
| 2. | Look for any chafed, pierced, pinched or partially broken wires. |
| 3. | Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Sensor and Control Module connectors. |
| 4. | Perform any Technical Service Bulletins that may apply. |
Were there any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace and program the Powertrain Control Module in accordance with the Service Information. (Refer to 08 - Electrical/8E - Electronic Control Modules/MODULE, Powertrain Control - Removal) .
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).