Fault Code Guide

J1587 Fault 136-023 ABS Warning Light
MID SID FMI Problem Test Test Result Action
136 023 05 Open circuit or low current
1. Disconnect the black X2
connector from the ECU.
Turn the ignition ON.
ABS light
illuminates
Check circuit 376L for
open circuit between splice
S22 and X2/8 at the ABS
connector. Repair as
necessary.
ABS light does
not illuminate
Check the bulb and wire
(circuit 376L between
splice S22 and ICU pin
B11. If okay, replace the
ICU.
Table 10, J1587 Fault 136-023 ABS Warning Light
J1587 Fault 136-030 Recirculation Pump Relay
MID SID FMI Problem Test Test Result Action
136 030 03 Relay shorted to power
1. Disconnect the black X2
ECU connector. With the
ignition ON, measure the
voltage between Pin 6 and
a good chassis ground.
Voltage zero
If the problem persists,
suspect the ECU is at
fault.
Voltage not zero
Circuit 376H is shorted to
power. Repair as
necessary.
136 030 05 Relay open circuit
2. Disconnect the black X2
ECU connector. Measure
the resistance between Pin
6 and a good chassis
ground.
Resistance
between 50 and
200 ohms
If the problem persists,
suspect the ECU is at
fault.
Resistance
below 50 or
above 200 ohms
Check the relay coil, relay
coil ground circuit, and
Circuit 376H for an open
circuit. Repair as
necessary.
136 030 06 Relay short to ground
3. Disconnect the black X2
ECU connector. Measure
the resistance between Pin
6 and a good chassis
ground.
Resistance
between 50 and
200 ohms
If the problem persists,
suspect the ECU is at
fault.
Resistance
below 50 or
above 200 ohms
Check Circuit 376H for a
short to ground. Repair as
necessary.
Meritor WABCO Hydraulic Antilock Braking System (ABS) 42.26
Troubleshooting
Business Class M2 Workshop Manual, Supplement 4, March 2003300/16