Fault Code Guide

Circuit Wire Numbers and Descriptions, "D" Version
Pin Connector Pin Number
Vehicle Wire
Number
WABCO Circuit
Description
12-Pin Green X3
1 — Not Used
2 — Not Used
3 377LR+ Left Rear Sensor
4 377RF– Right Front Sensor
5 377LF+ Left Front Sensor
6 377RR+ Right Rear Sensor
7 377RR– Right Rear Sensor
8 377LF– Left Front Sensor
9 377RF+ Right Front Sensor
10 377LR– Left Rear Sensor
11 — Not Used
12 — Not Used
Table 2, Circuit Wire Numbers and Descriptions, "D" Version
ABS Modulator Assembly Pin Connectors
Vehicle Wire
Number
Pin Number Circuit Description
1 376LRO Left Rear Outlet Valve
2 378LRI Left Rear Inlet Valve
3 — Not Used
4 378RFI Right Front Inlet Valve
5 378RFO
Right Front Outlet
Valve
6 — Not Used
7 — Not Used
8 GNDE Ground
9 — Not Used
ABS Modulator Assembly Pin Connectors
Vehicle Wire
Number
Pin Number Circuit Description
10 378RRO
Right Rear Outlet
Valve
11 378RRI Right Rear Inlet Valve
12 378LFI Left Front Inlet Valve
13 378LFO Left Front Outlet Valve
1 GND Pump Ground
2 376A Pump Power
Table 3, ABS Modulator Assembly Pin Connectors
Troubleshooting Tables
J1587 Fault 136-001 Left Front Wheel Sensor
MID SID FMI Problem Test Test Result Action
136 001 01 Incorrect sensor air gap
1. Adjust the sensor.
Check the AC voltage
across Pins 5 and 8 of the
green X3 ECU connector
(Circuits 377LF+ and 377
LF–) while rotating the left
front wheel 30 rpm.
Voltage greater
than 0.2 VAC
Sensor adjustment solved
the problem. Clear the
stored faults and drive the
vehicle 4 mph (6 km/h).
Voltage less
than 0.2 VAC
Check for excessive wheel
bearing end play. Repair
as necessary.
Meritor WABCO Hydraulic Antilock Braking System (ABS) 42.26
Troubleshooting
Business Class M2 Workshop Manual, Supplement 4, March 2003 300/9