Volvo TSI, Manual

Page: 209 / 250

Group 28 Troubleshooting
MID 144 PPID 69 Idle Validation Switch
The function is used to be able to drive the vehicle in “limp home mode” if a fault has
occurred in the wiring to the engine electronic control unit (EECU).
•
Text Messages
In vehicles equipped with diagnostic display, the fol-
lowing message(s) will appear:
•
Instrument Cluster Graphics Display (VN):
Buff. idle val. sw.
•
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:
Buffered idle validation switch
Fault Codes
FMI 4
Abnormally low voltage.
Conditions for fault code:
•
If the output signal from the buffered idle validation
switch deviates from the input signal from idle vali-
dation switch 1, the VECU interprets this as a fault
and an fault code is set.
Note: The fault code is set first when the accelera-
tor pedal is depressed.
Possible cause:
•
Short circuit to ground, signal wire
Reaction from the VECU:
•
Fault code is set.
•
Yellow lamp is requested.
Noticeable external symptom:
•
Yellow lamp lights up.
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