Fault Code Guide

J1587 Fault 136-054 Recirculation Pump
MID SID FMI Problem Test Test Result Action
136 054 03
Recirculation pump on
without being activated by
ECU
NOTE: In this case the
ECU is sensing voltage on
the pump monitor circuit
(Pin 10 of the black X2
connector) when the pump
relay was not activated by
the ECU (Pin 6 of the
black X2 connector).
1. Remove the black X2
connector from the ECU.
With the ignition ON,
measure the voltage
between Pin 10 and a
good chassis ground.
Voltage zero
Check the ECU and verify
the fault.
Voltage not zero Go to Test 2.
2. Remove the ABS pump
relay (R17) and repeat Test
1.
Voltage zero
Check the ABS pump relay
R17; it may be sticking or
shorted.
Voltage not zero
Check for a short to power
in Circuit 376B causing the
pump to run when it
should not be. Repair as
necessary.
136 054 04
Recirculation pump does
not switch on when
activated by the ECU
NOTE: In this case the
ECU does not sense
voltage on the pump
monitor circuit (Pin 10 of
the black X2 ECU
connector) when the pump
relay was activated by the
ECU (Pin 6 of the black X2
ECU connector).
3. Remove the black X2
connector from the ECU.
With the ignition ON, link
Pins 6 and 3 while
measuring the voltage
between Pin 10 and a
good chassis ground. The
pump should run (do not
hold for more than 1
minute).
Voltage between
9.5 and 14 volts
Check for intermittent
connections in Circuit
376B and check the ABS
pump relay for intermittent
operation. Repair as
necessary.
Voltage below
9.5 or above 14
volts
Check Circuit 376A and
check Relay R17. Repair
as necessary.
136 054 07
Recirculation pump sticks
or is locked
NOTE: In this case, the
ECU senses high current
on the pump monitor circuit
(Pin 10 of the black X2
ECU connector) indicating
the pump motor is locked.
4. Remove the black X2
connector from the ECU.
With the ignition ON,
momentarily link Pins 6
and 3. The pump should
run (do not hold for more
than 1 minute).
Pump runs
Repeat the test to verify. If
the fault persists, suspect
a problem with the ECU.
Pump does not
run
Replace the recirculation
pump.
Table 20, J1587 Fault 136-054 Recirculation Pump
Meritor WABCO Hydraulic Antilock Braking System (ABS) 42.26
Troubleshooting
Business Class M2 Workshop Manual, Supplement 4, March 2003300/26