Miscellaneous troubleshooting – Bendix Commercial Vehicle Systems EC-80 ABS ATC SD User Manual
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Miscellaneous Troubleshooting
Test
Measurement
Stop Lamp Switch to Ground 9 to 17 VDC
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.
Dynamometer Test Mode (ATC Indicator Lamp
Continuously Illuminated)
1. Clear the Dynamometer Test Mode by depressing and
releasing the blink code switch three times (or use an
off‑board diagnostic tool).
2. Apply and release service brake, does lamp
extinguish?
3. Verify brake lamp switch is connected to ECU via hard
wire or J1939.
4. With service brake released, check for presence of stop
lamp bulb.
Stop Lamp Switch Test
1. With the service brake applied, measure the system
voltage (9 to 17 VDC) stop lamp switch input to ECU.
ABS Indicator Lamp
1. Verify diagnostic blink code switch is open when not
activated.
PMV Commons
1. Measure resistance between any common (PMV, TCV,
and Diff.) and voltage or ground.
Test
Measurement
Any PMV, TCV, or Diff.
Open Circuit (no continuity)
Common to Voltage
or Ground
Retarder Relay
1. Measure resistance between retarder disable output of
Bendix
®
EC‑80
™
controller and voltage / ground.
Test
Measurement
Retarder disable to Voltage
Open Circuit (no continuity)
or Ground
2. Verify vehicle has retarder relay.
3. Verify proper wiring from ECU to retarder relay.
Differential Lock Solenoid
1. Measure resistance between Diff lock solenoid and
voltage or ground.
Test
Measurement
Diff. Lock Solenoid to Voltage Open Circuit (no continuity)
or Ground
Cab-mount ECU: Looking into
wire harness connector
Connector
Pin PMV Location
4
TCV Common
X1
9
Stop Lamp Switch
18 Way
12
ABS WL Ground
15
ABS WL Interlock
17 Retarder
18
ABS WL
3
PMV Left Steer Axle Common
X2
6
PMV Right Steer Axle Common
18 Way
9
PMV Right Drive Axle Common
12
PMV Left Drive Axle Common
2
Diff Lock Solenoid
X3
3
Diff Lock Solenoid Common
15 Way
6
PMV Left Additional Axle Common
9
PMV Right Additional Axle Common