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Group 28 Troubleshooting
MID 144 PSID 3 Idle Validation Switch 3
This applies only to vehicles with a second accelerator pedal assembly (WX).
Note: Idle validation switch 2 is not used in North American applications.
•
Text Messages
In vehicles equipped with diagnostic display, the fol-
lowing message(s) will appear:
•
Instrument Cluster Graphics Display (VN):
Idle validation switch 3
•
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:
Idle validation switch 3
Fault Codes
FMI 7
Incorrect response from mechanical system.
Conditions for fault code:
•
If the signal from the idle validation switch is not
available with the accelerator position sensor below
13% travel, the VECU interprets this as a fault and
an fault code is set.
Possible cause:
•
Faulty idle validation switch.
•
Open circuit in the supply wire.
•
Open circuit in the signal wire.
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The signal wire short-circuited to ground.
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The signal wire short-circuited to voltage.
•
Switch resistance and oxidation.
Reaction from the VECU:
•
Fault code is set.
•
Yellow lamp is requested.
Noticeable external symptom:
•
Yellow lamp lights up.
•
The engine does not respond correctly when the
second accelerator pedal is depressed.
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