Volvo Engine D11L (Tier 4) Fault Code: SID 21 FMI 8 Engine Position

Volvo Engine D11L (Tier 4) Fault Code: SID 21 FMI 8 Engine Position

CONTROL UNIT:
Engine ECU

DETECTION CONDITIONS:
The engine control unit (E-ECU) registers that frequency of the signal from the sensor is abnormal.

SYMPTOM:
1. Difficult to start at next start attempt (no symptom if error code is generated when engine is running).
2. Loss of power.

POSSIBLE CAUSES:
1. Electric interference on speed signal.
2. Poor insulation or defective cable.
3. Incorrectly installed sensor (incorrect distance to sensor gear).
4. Defective sensor.
5. Defective sensor gear.