Bendix Commercial Vehicle Systems EC-60 ESP CONTROLLERS ADV User Manual
Page 43
43
Test Measurement
Power and Ground Input
X4 - 4 Power
B = Power Input
X4 - 1 Common
A = Ground Input
Troubleshooting Diagnostic Trouble Codes
Brake Demand/Load Sensors
Brake Demand/Load Sensor Tests
1 . Verify continuity between the ECU and the pressure
sensor power and ground.
2 . Verify wiring between the Load Sensor and the ECU.
Load Sensor
ECU Wire
Measurement
Wire Harness
Harness
Terminal
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
Measurement
Harness Terminal
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 or higher 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 the Brake Demand Sensor(s)
and/or the Load Sensor.
1st . Blink
Code
24
Location:
Brake Demand/
Load Sensor
2nd .
Blink
Code
Diagnostic Trouble
Code Description
Repair Information
1
PS1 Open or Shorted Check wiring between Brake Demand Sensor (primary brake circuit) and ECU.
Verify operation of pressure sensor.
2
PS2 Open or Shorted Check wiring between Brake Demand Sensor (secondary brake circuit) and
ECU. Verify operation of pressure sensor.
3
PS3 Open or Shorted Check wiring between Load Sensor and ECU. Verify operation of pressure
sensor.
4
PS1/2 Plausibility Error ECU has detected an invalid pressure sensor signal from one of the Brake
Demand Sensors.
5
PS Supply Voltage
Error
Incorrect supply voltage to the sensors. Verify proper voltage at sensor
connectors. Verify wiring between the ECU and the sensors. Verify proper
output voltage from the ECU (Specifically, ensure that X4-4 PS_SPL is not
shorted to ground).
6
PS Not Calibrated
Perform static sensor calibration procedure. (NOTE: When replacing an ECU,
this DTC may occur.)
7
PS Error
Verify operation of pressure sensor.