Fault Code Guide

Ground Faults Troubleshooting (SID 014)
MID SID FMI Problem Test Test Result Action
136 014 04 Low voltage or
open circuit
1. Disconnect the X1
(gray) connector at the
ABS ECU. With the
ignition ON, measure the
voltage between pins 1
and 12.
Voltage is 9.5 to 14
volts.
System voltage is acceptable.
Check for intermittent low voltage.
Check the batteries and charging
system. Voltage may have been
temporarily too low. Repair as
necessary.
Voltage is less
than 9.5 volts.
Check vehicle batteries and
charging system. Check ABS
ECU power and ground circuits
for open or high resistance.
Repair as necessary.
136 014 05 Central group
open or high
resistance
2. Disconnect the X1
(gray) connector at the
ABS ECU. Check the
ground circuit (pin 11) for
high resistance or open
circuit.
Ground is okay Verify the fault. Check the ground
circuits for open or high
resistance. Repair as necessary.
Ground is open or
has high resistance
Repair ground circuit as
necessary.
136 014 06 Internal relay
does not open
If fault repeats, replace the ABS
ECU.
Table 10, Ground Faults Troubleshooting (SID 014)
Ground Faults Troubleshooting (SID 015)
MID SID FMI Problem Test Test Result Action
136 015 03 ATC valve
grounded to
power.
1. Disconnect the X3
(green) connector, check
for voltage between pin 6
and ground.
Voltage at pin 6. Circuit 378T- is shorted to power.
Locate fault and repair as
necessary.
No voltage at pin
6.
Verify fault. Check for intermittent
fault in circuit 378-, repair as
necessary.
136 015 04 Low voltage or
open circuit
2. Disconnect the X1
(gray) connector at the
ABS ECU. With the
ignition ON, measure the
voltage between pin 2 and
a good ground.
Voltage is 9.5 to 14
volts
System voltage is acceptable.
Check for intermittent low voltage.
Check the batteries and charging
system. Voltage may have been
temporarily too low. Repair as
necessary.
Voltage is less
than 9.5 volts
Repair voltage supply to ECU.
136 015 05 ATC Valve - High
Impedance
Replace ABS ECU if fault
persists.
06 ATC Valve circuit
shorted to ground
Disconnect the X3 (green)
connector, check
resistance between pin 6
and a good ground.
Resistance is less
than 10,000 ohms
Verify fault. Check for intermittent
fault in circuit 378-, repair as
necessary.
Resistance is great
than 10,000 ohms
Verify fault. Check for intermittent
fault in circuit 378T-, repair as
necessary.
Meritor WABCO Pneumatic Antilock Braking System
(ABS)
42.00
ABS System Troubleshooting
Business Class M2 Workshop Manual, Supplement 2, June 2002300/12