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Engine Position Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 121 PID: P190 SPN: 190 FMI: 10/10 LAMP: Yellow SRT: |
No engine speed signal detected at one of the engine position sensor circuits. |
None on performance. |
 Engine Position Sensor Circuit
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Circuit Description
The engine position sensor monitors the engine position and the engine speed and passes this information to the electronic control module (ECM) through the sensor harness.
Component Location
The engine position sensor is located above the accessory drive.
Shop Talk
- If the fault occurs only at a certain engine temperature, check the engine position sensor circuit while the engine is at that particular temperature.
- Check the camshaft end play to make sure the camshaft gear is not moving too far away from the end of the engine position sensor.
- Check for moisture in the sensor harness connector at the ECM.
- Possible causes for this fault include a damaged engine position sensor, a short circuit to ground, or an open circuit.
Refer to Troubleshooting Fault Code t05-121
Last Modified: 02-Sep-2010
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