Volvo Symptom D12D US02 Service Manual page 90

Group 20
Step 1: Fault Code Readings
Active and inactive registered fault codes can point to
faults but also be a fault finding aid for the symptom.
Freeze frames of information for specific fault codes may
also be helpful for finding causes for the symptom.
Action:
Check for active or inactive fault codes related to symptoms.
Check inactive codes with high number of occurrences.
"Step 2: Visual Inspection (System Checks)" page 87
"Engine Speed Surges in Power Take-off or Cruise
Control" page 74
86
C2002639
D
Fault tracing using relevant service information
should always be carried out for relevant fault codes.
Components/functions of special interest:
•
MID 128, Engine ECU
PID 94 Fuel supply pressure
PID 102 Intake manifold pressure
PID 110 Coolant temperature
PPID 122 VCB compression brake status
PPID 124 Exhaust pressure governor, EPG 1
SID 1–6 Unit injectors
SID 21 Engine position, cam
SID 22 Engine speed, flywheel
SID 254 Engine ECU
•
MID 144, Vehicle ECU
PPID 71 Cruise control and retarder switches,
power supply
SID 243 CC set switch
Refer to:
Instrument cluster or VCADS Pro
VCADS Pro: "Fault Codes, Test Mode"