Group 38 Fault Codes, Instrument Cluster
Troubleshooting
3811-21-02-10
MID 140 PID 77 Forward Rear
Axle Temperature, Check
Special tools: 9998699, 9813194
Other special equipment: J39200, 9990008
NOTE!
•
Read off other fault codes for the instrument cluster.
•
Turn the ignition OFF before disconnecting the con-
nector.
•
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 sensor dis-
connected.
•
Measuring resistance using a
multimeter.
•
Instrument cluster connected.
•
Ignition off.
•
Measurement to the instrument
cluster. (See page 17 for mea-
surement points.)
Measuring
points
Nominal value
B - ground
R
≈
0
Note: If the correct value is not
achieved, disconnect the voltage from
the battery.
J39200
9990008
Signal cable
2
Requirements:
•
The connector to the sensor is
disconnected.
•
Measuring voltage using the multi-
meter.
•
Instrument cluster connected.
•
Ignition key in the drive position.
•
Measurement to the instrument
cluster. (See page 17 for mea-
surement points.)
Measuring
points
Nominal value
A - ground
V
max
≈
5 V
V
min
≈
0 V
J39200
9990008
18
