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Group 28 Troubleshooting
MID 144 PPID 73 Second Accelerator Pedal, Supply Sensors
The second accelerator pedal position sensor is supplied with a reference voltage of
5.0 V. Each change of the second accelerator pedal angle controls the input signal to
the VECU.
Note: Applies only to vehicles with a second accelerator
pedal assembly (such as the WX).
•
Text Messages
In vehicles equipped with diagnostic display, the fol-
lowing message(s) will appear:
•
Instrument Cluster Graphics Display (VN):
Output supply #2
•
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:
Second throttle and wet tank sensor supply
Fault Codes
FMI 3
Abnormally high voltage.
Conditions for fault code:
•
If the VECU registers a voltage higher than 5.5 V on
the supply wire, the VECU interprets this as a fault
and an fault code is set.
Possible cause:
•
Open circuit in ground wire.
•
Supply wire short-circuited to higher voltage.
•
Open circuit in supply wire.
•
Faulty second accelerator pedal position sensor.
•
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 when the second ac-
celerator pedal is depressed.
FMI 4
Abnormally low voltage.
Conditions for fault code:
•
If the VECU registers a voltage lower than 4.5 V on
the supply wire, the VECU interprets this as a fault
and an fault code is set.
Possible cause:
•
Supply wire short-circuited to ground or lower volt-
age.
•
Faulty second accelerator pedal position sensor.
Reaction from the VECU:
•
Fault code is set.
•
Yellow lamp is requested.
Noticeable external symptom:
•
Yellow lamp lights up.
•
Engine does not respond when the second acceler-
ator pedal is depressed.
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