Fault Code Guide

J1587 Fault Codes (MID 136 SID 023): ABS Warning Lamp Circuit
FMI Fault Description Test Test Result Action
05 Open Circuit Test 1:
1. Disconnect the gray X1 connector at the
ABS ECU.
2. Turn the ignition ON.
3. Check for voltage between pin 10 of the
X1 connector (harness side) and a known
good ground.
12V (approx.) Go to Test 3.
0V Go to Test 2.
Test 2:
1. Remove the ABS relay.Check for voltage
between circuit 81C and a known good
ground.
2. Locate circuit 81C (corresponds to pin 86
of the relay.
3. Turn the ignition ON.
4. Check for voltage between circuit 81C
and a known good ground.
12V (approx.) Go to Test 3.
0V
Check circuit 81C be-
tween the relay and
the BHM. If OK, refer
to group 54 for diag-
nosing the BHM.
Test 3:
1. Remove the ABS relay.
2. Measure resistance across pins 85 and
86 on the relay.
70-90 Ohms
No problem found.
Check circuit 376L1
between the ABS ECU
and the ABS relay and
check circuit 81C for
intermittent open cir-
cuit. If OK, replace
ABS ECU.
Greater than 90
(an open relay
coil should result
in a reading of
680 Ohms)
Replace the ABS relay.
Table 1, J1587 Fault Codes (MID 136 SID 023): ABS Warning Lamp Circuit
Meritor WABCO Pneumatic Antilock Braking System
(ABS)
42.00
ABS Lamp Troubleshooting
Business Class M2 Workshop Manual, Supplement 0, January 2002 310/3