DSG-423 ENGINE CONTROLS
08-40
Engine Control Module (GCP) - Diagnostic
Trouble Codes
CAUTION: When checking codes with the diagnos-
tic software, the DTC terminal can NOT
be ground-
ed.
CAUTION: Removing battery power before access-
ing diagnostic program will erase all codes record-
ed.
This section contains circuit description information and
troubleshooting charts on all the DTC’s obtained by
diagnostic software or a Malfunction Indicator Lamp
(MIL). When diagnostic trouble codes are obtained by a
Malfunction Indicator Lamp (MIL), the following
sequence will be flashed:
• 123 will flash 3 times to indicate the beginning of the
flash code display sequence.
• Any active DTC’s will flash 3 times each.
• 123 will flash 3 times indicating the end of the code
display sequence.
If code 123 is the only code present, the system does
not have any active codes - all systems are working
fine.
If an active DTC is present, refer to the corresponding
DTC chart. Begin with the lowest number code first.
NOTE: If you have a symptom of the pedal not working,
and no DTC is set, go to the voltage screen and check
pedal voltage. If pedal voltage is .75 - 1.25 volts, and
idle validation switch says you’re at idle - replace the
pedal.
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