Bendix Commercial Vehicle Systems GEN 5 ABS - Manual (Page 27)

27
Fault Codes
1st
2nd
Blink Code
Sequence
1.5 Sec.
Pause
Flashes Location
2 Left Steer
3 Right Steer
4 Left Rear
5 Right Rear
6 Left Rear Rear
7 Right Rear Rear
Action
If necessary, clean and lubricate sensor. Press into mounting hole until it bottoms against
tone wheel. Clear trouble code and verify that code is corrected by test driving the vehicle.
The indicator lamp will remain on until proper sensor output is detected even though the code
has been cleared.
Check sensor resistance. If sensor resistance is out of range, replace sensor. Clean and
lubricate sensor. Press into mounting hole until it bottoms against tone wheel. Clear trouble
code and verify that code is corrected by test driving the vehicle.The indicator lamp will remain
on until proper sensor output is detected even though the code has been cleared. Use
approved lubricant.
Examine tone ring for damage. Replace tone ring and/or hub if necessary. Check wheel
bearing adjustment. Adjust wheel bearings if necessary. Clear trouble code and verify that code
is corrected by test driving the vehicle. The indicator lamp will remain on until proper sensor
output is detected even though the code has been cleared.
Check mechanical function of brake. Check for kinked or restricted hoses. Clear trouble code
and verify that code is corrected by test driving the vehicle.The indicator lamp will remain on
until proper sensor output is detected even though the code has been cleared.
Check for damaged tone ring or excessive run out. Repair tone ring and/or adjust wheel
bearings. Clear trouble code and test drive the vehicle. The indicator lamp will remain on until
proper sensor output is detected even though the trouble code has been cleared.
Use an ohm meter to verify proper sensor resistance (Fig 24). Check harness for shorts or
opens. Repair harness and/or replace sensor as necessary. Clear trouble code and verify that
code is corrected by test driving the vehicle. The indicator lamp will remain on until proper
sensor output is detected even though the trouble code has been cleared.
Clear trouble code and test drive the vehicle. The indicator lamp will remain on until proper
sensor output is detected even though the code has been cleared. If trouble code recurs, or
cannot be cleared, replace ECU.
Check the control unit configuration and verify that sensors are wired in the proper location
for the configuration (Refer to Schematic).
Flashes Condition
1 Sensor air gap too large.
2 Air gap too large or sensor
shorted.
3 Speed sensor signal is noisy.
4 Wheel locked for excessive
period of time during an ABS cycle.
5 Excessive rate of deceleration
found at a wheel site.
6 Sensor connection shorted low or
high or sensor is open.
7 There is an internal error at the
sensor port of the ECU.
8 A sensor has been found in the
wrong location.
3
2
7
6
3
2
5
4
FIGURE 25 - Speed Sensor Diagnostic Trouble Code Troubleshooting Guide