Volvo TAD650VE Workshop Manual page 114

Diagnostic Trouble Codes
112
FMI 3 Checking sensor circuit
Conditions for fault code:
No sensor signal when expected or permanent loss of
sensor signal.
Possible reason:
• Open circuit in any or both of cables to the speed
sensor.
• Incorrectly mounted speed sensor.
• Faulty speed sensor.
Suitable action:
1. Check cable harness and connectors between
speed sensor and EMS 2.
2. Check contact pressure in socket 37 and 38 in
engine connector A.
4. Check installation of speed sensor.
5. Check function of speed sensor.
FMI 8 Checking sensor circuit
Conditions for fault code:
Incorrect speed sensor signal.
Possible reason:
• Incorrectly mounted speed sensor.
• Electrical interference in the sensor signal.
Suitable action:
1. Check wiring and connectors between speed sen-
sor and EMS 2.
2. Check contact pressure in socket 37 and 38 in
engine connector A.
3. Check installation of speed sensor.
4. Attempt to localize the source of interference.
5. Check and clean the speed sensor.
Group 30: Electrical system