Volvo TSI, Manual

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Group 28 Troubleshooting
MID 144 PPID 71 Cruise Control and Engine Brake, Supply Switch
Voltage supply to the cruise control and exhaust brake control switches. Also voltage
supply to the idle validation switch 3 (on second accelerator pedal), if so equipped
•
Text Messages
In vehicles equipped with diagnostic display, the fol-
lowing message(s) will appear:
•
Instrument Cluster Graphics Display (VN):
Output supply #4
•
Data Link Instrument Cluster (WG, AC, WX):
The Data Link instrument cluster graphics display
used on WG-, AC-, and WX-series vehicles can
display a limited number of text messages. For infor-
mation, see “Data Link Instrumentation,” Volvo
Service Publication PV776–381–620SM.
•
VCADS Pro Display:
Cruise control and retarder switch supply
Fault Codes
FMI 4
Abnormally low voltage.
Conditions for fault code:
•
If the VECU registers a voltage lower than 2.5 V on
the supply wire, the VECU interprets this as a fault
and an fault code is set.
Possible cause:
•
The supply wire short-circuited to ground.
•
The signal wire for the cruise control (SET+/SET-
/RESUME/ON) short-circuited to ground.
•
The signal wire for the exhaust brake switch
(EPG/VEB) short-circuited to ground.
•
The signal wire for the idle validation switch 3 short-
circuited to ground.
Reaction from the VECU:
•
Fault code is set.
•
Yellow lamp is requested.
Noticeable external symptom:
•
Yellow lamp lights up.
•
The cruise control does not function.
•
Exhaust brake does not function.
•
Idle validation switch 3 does not function.
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