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Group 28 Troubleshooting
MID 128 PPID 122 VCB Engine Compression Brake
D12B and D12C
Fault Codes
FMI 3
Short circuit to voltage.
Conditions for fault code:
•
Output activated.
•
Short circuit to battery voltage on EA33.
Possible cause:
•
Short circuit to battery voltage between the VCB so-
lenoid valve and EECU.
•
Short circuit in VCB solenoid valve.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
•
The output is switched off.
Noticeable external symptom:
•
Yellow lamp lights up.
•
Reduced engine brake power because the VCB
cannot be activated.
FMI 4
Short circuit to ground.
Conditions for fault code:
•
Output switched off.
•
Short circuit to ground on EA33.
Possible cause:
•
Short circuit to ground between the VCB solenoid
valve and EECU.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
•
The output is switched off.
Noticeable external symptom:
•
Yellow lamp lights up.
•
VCB is on all the time.
•
Low power output.
•
Black smoke.
•
Extreme uneven operation.
FMI 5
Break.
Conditions for fault code:
•
Output switched off.
•
Open circuit in the VCB circuit.
Possible cause:
•
Open circuit between the VCB solenoid valve and
EECU.
•
Open circuit in the supply wire to VCB solenoid
valve.
•
Blown fuse for supply to VCB solenoid valve.
•
Open circuit in VCB solenoid valve.
Reaction from the EECU:
•
Fault code is set.
•
Yellow lamp is requested.
•
Output is switched off.
Noticeable external symptom:
•
Yellow lamp lights up.
•
Reduced engine brake power because the VCB
cannot be activated.
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