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Grove
Published 01-14-2021 Control # 707-01
8-73
TMS9000-2 SERVICE MANUAL
CARRIER
8
Miscellaneous Troubleshooting
For all tests below, take all measurements at ECU harness
connector pins in order to check wire harness and sensor.
Probe the connector carefully so that the terminals are not
damaged.
Stop Lamp Switch Test
1.
With the service brake applied, measure the system
voltage (9 to 17 VDC) stop lamp switch input to ECU.
2.
Apply and release service brake. Does lamp extinguish?
2
Stop Lamp Switch Defective
Apply and release service brake. Check for brake switch input into ECU (see
system wiring schematic). With service brake released, check for presence of
the stop lamp bulb. With service brake applied, verify system voltage is now
present at the stop lamp switch input to the ECU. Check for damaged wiring
between ECU, stop lamp switch and bulb. Check for corroded or damaged
connectors. Check for damaged or reversed J1939 wiring. Check for
corroded or damaged connectors on J1939 link. Verify presence of engine
ECU on the J1939 link. Verify ECU configuration.
3
Dynamometer Test Mode
ECU has been placed in the Dynamometer Test Mode by either the diagnostic
blink code switch or a hand-held or PC-based diagnostic tool. ATC is
disabled.
4
Retarder Relay Open Circuit or
Shorted to Ground
Verify vehicle contains a retarder relay. Verify ECU configuration. Check
wiring between ECU and retarder relay. Verify no continuity between retarder
disable output of E-60 controller and ground. Verify condition and wiring of the
retarder relay.
5
Retarder Relay Circuit Shorted to
Voltage
Check wiring between ECU and retarder relay. Verify no continuity between
retarder disable output of E-60 controller and voltage. Verify condition and
wiring of the retarder relay.
6
ABS Indicator Lamp Circuit Fault
Check operation of diagnostic blink code switch. Check wiring of diagnostic
blink code switch, ABS WL and ABS WL relay (frame ECUs only). Verify ABS
WL ground input (cab ECUs only).
7
PMV Common Shorted to Ground
Verify no continuity between the CMN of all PMVs, TCV, and Diff. Lock
Solenoid and ground. Check for corroded / damaged wiring or connectors
between the ECU and CMN of all PMVs, TCV and Diff. Lock Solenoid.
8
PMV Common Shorted to Voltage
Verify no continuity between the CMN of all PMVs, TCV, and Diff. Lock
Solenoid and ground. Check for corroded / damaged wiring or connectors
between the ECU and CMN of all PMVs, TCV and Diff. Lock Solenoid.
9
ATC Disabled to Prevent Brake
Fade
ATC is temporarily disabled to prevent excessive heating of the foundation
brakes.
10
Tire Size Out of Range (Front to
Rear)
Verify correct tire size as desired. Verify proper tire inflation. Verify correct
number of exciter ring teeth. Verify that the ECU has the proper tire size
settings.
11
Wheel Speed Sensors Reversed
on an Axle
Sensors are reversed (left to right) on one of the axles. Verify proper
installation, connection and wiring of the sensors.
12
Diff. Lock Solenoid Shorted to
Ground or Open Circuit
Verify no continuity between the Diff. Lock Solenoid and ground. Check for
corroded / damaged wiring or connectors between the ECU and Diff. Lock
Solenoid.
13
Diff. Lock Solenoid Shorted to
Voltage
Verify no continuity between the Diff. Lock Solenoid and ground. Check for
corroded / damaged wiring or connectors between the ECU and Diff. Lock
Solenoid.
23
I/O 2 or I/O 3 Shorted High
Check for short circuit condition between voltage and the I/O 2 and I/O 3
circuits.
2nd
Blink
Code
Diagnostic Trouble
Code Description
Repair Information
Fo
r
Reference
Only