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Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 689 PID: P190 SPN: 190 FMI: 2/2 LAMP: Amber SRT: |
Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect. Loss of signal from crankshaft sensor. |
Engine can run rough. Possibly poor starting capability. Engine runs using backup speed sensor. Engine power is reduced. |
 Crankshaft Engine Speed Sensor Circuit
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Circuit Description
The crankshaft engine speed sensor provides engine speed information to the electronic control module (ECM). The sensor is powered by +5 volts. The sensor generates the signal by sensing the movement of target teeth machined into a tone wheel that is mounted to the crankshaft.
Component Location
The engine speed sensor is located on the intake side of the engine between number 5 and number 6 cylinders at the crankshaft level. For ISB and QSB5.9 the crankshaft engine speed sensor is located on the intake side of the engine behind the vibration damper near the tone wheel. Refer to Procedure 100-002 for a detailed component location view.
Shop Talk
This fault code is recorded when the electronic control module (ECM) does not receive a signal from the crankshaft engine speed sensor, or the signal it receives is degraded.
Possible causes of this fault code include:
- Open circuit on the supply, signal, or return circuits in the sensor, engine harness, or ECM
- Short circuits to ground or return circuits in the sensor, engine harness, or ECM
- Short circuits to a voltage source in the sensor, engine harness, or ECM
- Damage to the sensor target teeth or tone wheel.
INSITE™ electronic service tool monitor parameter associated with this fault code and sensor include:
- Engine speed sensor state.
If this fault code occurs intermittently, look closely for causes of intermittent harness connections such as loose or worn pins in the engine harness connectors.
Refer to Troubleshooting Fault Code t05-689
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