Volvo TAD650VE Workshop Manual page 56

Diagnostic Trouble Codes
54
FMI 4 Abnormally low voltage or short
circuit to lower voltage
Conditions for fault code:
The voltage on pin B47 on the EMS 2 is less than 0.07
Volt.
Possible reason:
•
Short circuited sensor signal cable to battery neg-
ative.
•
Faulty sensor.
Suitable action:
1. Check cable harness and connectors between
boost temperature sensor and EMS 2.
2. Check function of boost temperature sensor.
FMI 5 Abnormally low current or open
circuit
Conditions for fault code:
The voltage on pin B47 on the EMS 2 is more than
4.95 Volt.
Possible reason:
•
An open circuit in 5V supply cable to sensor.
•
An open circuit in boost temperature signal cable.
•
Short circuited sensor signal cable to 5V voltage
or to battery voltage.
•
Faulty sensor.
Suitable action:
1. Check contact pressure in socket 47 and 7 in en-
gine connector A. Also check contact pressure in
connector at boost temperture sensor.
2. Check cable harness and connectors between
boost temperature sensor and EMS 2.
3. Check function of boost temperature sensor.
Group 30: Electrical system