Fault Code Guide

J1587 Fault 136-055 ECU
MID SID FMI Problem Test Test Result Action
136 055 02
Reference to ground
interrupted
1. With the ignition OFF,
measure the voltage
between Pin 2 of the gray
X1 ECU connector (Circuit
GND) and a good chassis
ground.
Voltage zero
volts
Go to Test 2.
Voltage not zero
volts
Check the ground circuit
for a short to positive
voltage.
2. Measure the resistance
between Pin 2 of the gray
X1 ECU connector and a
good chassis ground.
Resistance near
zero ohms
Check the ECU ground
circuit (GND) for an
intermittent or loose
connection. Check ground
Splice S10. If the problem
persists, suspect the ECU
is at fault.
Resistance
above zero
ohms
Check the ECU ground
circuit (GND). Repair as
necessary.
Table 21, J1587 Fault 136-055 ECU
J1587 Fault 136-251 Low Voltage
MID SID FMI Problem Test Test Result Action
136 251 03
Voltage too high
NOTE: Voltage to the ABS
ECU must be between 9.5
and 14 volts to function
properly.
1. Disconnect the black X2
ECU connector. Start the
engine and run it at
governed speed while
measuring the voltage
between Pins 3 and 9.
Voltage between
9.5 and 14 volts
Check the electrical
system. If the problem
persists, suspect the ECU
is at fault.
Voltage below
9.5 or above 14
volts
Check the batteries and
charging system for
malfunction. Repair as
necessary.
136 251 04
Low voltage to ABS
solenoid valves
NOTE: Voltage to the ABS
ECU must be between 9.5
and 14 volts to function
properly.
2. Disconnect the black X2
ECU connector. Start the
engine and run it at idle
while measuring the
voltage between Pins 3
and 9 of the black X2 ECU
connector.
Voltage between
9.5 and 14 volts
Verify that the batteries
were not drained or the
charging system was not
overloaded when the fault
occurred. If the problem
persists, suspect the ECU
is at fault.
Voltage below
9.5 or above 14
volts
Check the batteries and
charging system for
malfunction. Repair as
necessary.
Table 22, J1587 Fault 136-251 Low Voltage
Meritor WABCO Hydraulic Antilock Braking System (ABS) 42.26
Troubleshooting
Business Class M2 Workshop Manual, Supplement 4, March 2003 300/27