Bendix Commercial Vehicle Systems EC-80 ABS ATC SD - Manual (Page 27)

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12 Miscellaneous
1st. Blink
Code
Location
Troubleshooting Diagnostic Trouble Codes: Miscellaneous
Repair Information
2nd.
Blink
Code
Diagnostic
Trouble Code
Description
Repair Information
1 Stop Lamp Switch
Not Detected
ECU has not detected the presence of the stop lamp switch since ignition power was applied
(note that stop lamp switch input may be applied to the Bendix ® EC‑80 ™ controller using either
hardwire input or J1939). 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.
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 ATC Disabled or
Dynamometer Test
Mode Active
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 Bendix EC‑80
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 Bendix EC‑80 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, and ABS WL. Verify ABS WL ground input.
7 Common Shorted
to Ground
Verify no continuity between the CMN of all PMVs, (HSA, TCV, and Diff Lock Solenoid —
Bendix EC‑80 ATC options) and ground. Check for corroded/damaged wiring or connectors
between the ECU and CMN of all PMVs, (HSA, TCV, and Diff Lock Solenoid — Bendix
EC‑80 ATC options).
8 Common Shorted
to Voltage
Verify no continuity between the CMN of all PMVs, (HSA, TCV, and Diff Lock Solenoid —
Bendix EC‑80 ATC options) and voltage. Check for corroded/damaged wiring or connectors
between the ECU and CMN of all PMVs, (HSA, TCV, and Diff Lock Solenoid — Bendix
EC‑80 ATC options).
9 ATC Disabled
to Prevent Brake
Fade
ATC is temporarily disabled to prevent excessive heating of the foundation brakes.
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.