Group 38 Fault Codes, Instrument Cluster Troubleshooting
3811-21-02-14
MID 140 PID 117 Air Brake
Pressure, Front, Check
Special tools: 9998699, 9813194
Other special equipment: J39200
NOTE!
•
Read off other fault codes for the instrument cluster.
•
Ignition off.
•
Check all the relevant connectors. Check for loose
connections, contact resistance and oxidation. For a
detailed description of electrical fault tracing, see
separate service information under function group
371.
Tests in VCADS Pro
The following tests are useful for a closer examination of
the component function:
•
”3810–08–02–01 Instrument cluster test”.
•
”3810–08–02–02 Gauge checks, instrument cluster”.
Measurement at the component’s
connector to the instrument cluster
Note: Faults in the instrument cluster cable harness can
damage the component. Check the component if any of
the readings is outside its permitted range.
Ground cable
1
Requirements:
•
The connector for the front brake
air pressure sensor (B06A) dis-
connected.
•
Measuring resistance using a
multimeter.
•
Instrument cluster connected.
•
Ignition off.
•
Measurement to the instrument
cluster.
Measuring
points
Nominal value
B06A, pin A -
ground
R ≈ 0
Note: If the correct value is not
achieved, remove the voltage from the
battery and measure again.
J39200
Supply cable
2
Requirements:
•
The connector to the front brake
pressure sensor (B06A) is discon-
nected.
•
Measuring voltage using the multi-
meter.
•
Instrument cluster connected.
•
Ignition key in the drive position.
•
Measurement to the instrument
cluster.
Measuring
points
Nominal value
B06A, pin B -
ground
V ≈ 5V
J39200
Cable harness
3
For checking the cable harness, see
service information under function
group 371.
30
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