Bendix Commercial Vehicle Systems EC-60 ESP Controllers (Advanced Models) User Manual
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Brake Demand/Load Sensors
1st. Blink
Code
Location
Troubleshooting Diagnostic Trouble Codes
Brake Demand/Load Sensors
2nd. Diagnostic
Blink Trouble Code
Code Description
Repair Information
1
PS1 Open or
Shorted
2
PS2 Open or
Shorted
3
PS3 Open or
Shorted
4
PS1/2 Plausibility
Error
5
PS Supply
Voltage Error
6
PS Not
Calibrated
Check wiring between Brake Demand Sensor (primary brake circuit) and ECU. Verify
operation of pressure sensor.
Check wiring between Brake Demand Sensor (secondary brake circuit) and ECU.
Verify operation of pressure sensor.
Check wiring between Load Sensor and ECU. Verify operation of pressure sensor.
ECU has detected an invalid pressure sensor signal from one of the Brake Demand
Sensors.
Incorrect supply voltage for the sensors. Verify proper voltage at sensor connectors.
Verify wiring between the ECU and the sensors. Verify proper output voltage from
the ECU.
Perform static sensor calibration procedure.
Brake Demand/Load Sensor Tests
1. Measure resistance between input voltage and ground
at the sensor wiring harness connector.
Test
Measurement
Power and Ground Input
4.75 to 5.25 volts
B = Power Input
A = Ground Input
2. Verify wiring between the Load Sensor and the ECU.
Load Sensor Wire ECU Wire
Measurement
Harness Terminal
Harness Terminal
C
X4 - 2 Brake Demand
Verify Continuity
Sensor (primary brake circuit)
X4 - 5 Brake Demand
Verify Continuity
Sensor (secondary brake circuit)
X4 - 3 Load Sensor
Verify Continuity
Looking into wire
harness connector
3. Verify wiring between the Load Sensor and power/
ground.
Load Sensor Harness Terminal
Measurement
C to Voltage & Ground
Verify open circuit (no continuity)
4. To perform a calibration procedure of the Brake
Demand Sensor(s), ensure that the air system is fully
charged. Apply ignition power, and wait 30 seconds.
Perform a full application of the service brake and hold
for 5 seconds. Release the service brake.
5. To test the Brake Demand Sensor and/or the Load
Sensor, ACom V4.0 is required. Using the program,
select the “Component Test” option, followed by the
“ESP Test” option. The following screen should be
displayed.
6. Follow the prompts to test of the Brake Demand
Sensor(s) and/or the Load Sensor.