Group 30: Electrical system
Diagnostic Trouble Codes
35
Circuit description
In cold climate the intake air need too be preheated.
This is either done for GE engines by the preheater
which is located in the inlet manifoldor or for VE en-
gines by the glowplugs that are mounted in the cylin-
derhead. The preheat function is activated/deactivated
by the engine control unit via the preheat relay. When
the preheat function is activated B25 alter its potential
and the relay activates. B7 is a sense cable which
senses that the voltage supply to the preheater is cor-
rect.
Fault tracing
FMI 3 Abnormally high voltage or short
circuit to higher voltage
Possible reason:
•
Short circuit to B+ in cable harness between EMS
2 and preheat relay.
Suitable action:
1.
Check cable harness and connectors between
EMS 2 and preheat relay.
pre-heat relay
FMI 4 Abnormally low voltage or short
circuit to lower voltage
Possible reason:
•
Short circuit to battery negative in cable harness
between EMS 2 and preheat relay.
Suitable action:
1.
Check cable harness and connectors between
EMS 2 and preheat relay.
