Volvo TAD650VE Workshop Manual page 82

Diagnostic Trouble Codes
80
FMI 4 Abnormally low voltage or short
circuit to lower voltage
Conditions for fault code:
The voltage on pin A19 on the EMS 2 is less than 0.07
Volt.
Possible reason:
•
Short circuited sensor signal cable to battery neg-
ative.
•
Faulty rail pressure sensor.
Suitable action:
1. Check cable harness and connectors between rail
pressure sensor and EMS 2.
2. Check function of rail pressure sensor.
FMI 5 Abnormally low current or open
circuit
Conditions for fault code:
The voltage on pin A19 on the EMS 2 is more than
4.95 Volt.
Possible reason:
•
An open circuit in rail sensor 5V supply cable.
•
An open circuit in rail sensor negative cable.
•
An open circuit in rail sensor signal cable.
•
Short circuited sensor signal cable to 5V supply
cable.
•
Short circuited sensor negative cable to 5V sup-
ply cable.
•
Faulty rail pressure sensor.
Suitable action:
1. Check contact pressure in socket 7, 11 and 19 in
engine connector A. Also check contact pressure
in connector at fuel pressure sensor.
2. Check cable harness and connectors between rail
pressure sensor and EMS 2.
2. Check function of rail pressure sensor.
Group 30: Electrical system