Fault Code Guide

Left Rear Modulator Valve Troubleshooting (SID 009)
MID SID FMI Problem Test Test Result Action
136 009 06 Short to ground
Inlet or outlet
circuit shorted to
ground.
3. Check the modulator
valve inlet and outlet
circuit resistance.
Disconnect the connector
from the valve and
perform the modulator
valve test.
Resistance in both
circuits is within 4
to 8 ohms.
Check harness wiring circuits
378LRI, 378LRO, and 378LR– for
short to ground. Repair as
necessary.
Resistance in both
circuits is not within
4 to 8 ohms.
Replace modulator valve.
Table 8, Left Rear Modulator Valve Troubleshooting (SID 009)
Right Rear Modulator Valve Troubleshooting (SID 010)
MID SID FMI Problem Test Test Result Action
136 010 03 Short to power
Inlet or outlet
circuit shorted to
battery supply or
another modulator
valve wire.
1. Measure the voltage
between pins 7, 8, and 9
of the X3 (green)
connector and a good
chassis ground.
No voltage at
either pin
Repeat test. Check circuits
378RRO, 378RR–, and 378RRI
for intermittent short to power.
Check above circuits for shorts to
other modulator valve wires.
Repair as necessary.
If problem persists, the suspect
ECU is at fault.
Measurable
voltage at either
pin
Repair short to power in circuit
378RRO, 378RR–, or 378RRI.
136 010 05 Open circuit
Inlet or outlet
circuit open.
2. Check the modulator
valve inlet and outlet
circuit resistance.
Disconnect the connector
from the valve and
perform the modulator
valve test.
Resistance in both
circuits is within 4
to 8 ohms.
Check harness wiring circuits
378RRO, 378RRI, and 378RR–.
Resistance in both
circuits is not within
4 to 8 ohms.
Replace the modulator valve.
136 010 06 Short to ground
Inlet or outlet
circuit shorted to
ground.
3. Check the modulator
valve inlet and outlet
circuit resistance.
Disconnect the connector
from the valve and
perform the modulator
valve test.
Resistance in both
circuits is within 4
to 8 ohms.
Check harness wiring circuits
378RRI, 378RRO, and 378RR–
for short to ground. Repair as
necessary.
Resistance in both
circuits is not within
4 to 8 ohms.
Replace modulator valve.
Table 9, Right Rear Modulator Valve Troubleshooting (SID 010)
Meritor WABCO Pneumatic Antilock Braking System
(ABS)
42.00
ABS System Troubleshooting
Business Class M2 Workshop Manual, Supplement 2, June 2002 300/11