Jeep KJ Liberty 2005 Service Manual page 20

BRAKES (25E)
LEFT FRONT WHEEL SPEED SENSOR CIRCUIT —
TEST
1 Turn the ignition on.
With the DRBIII , read DTCs.
With the DRBIII , read and record Freeze Frame information.
With the DRBIII , erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII , read DTCs.
NOTE: The ABM must sense all four wheels at 25km/h (15 mph) before it will
extinguish the ABS indicators.
Does the DRBIII display WHEEL SPEED SENSOR CIRCUIT?
Yes → Go To 2
→ Go To 13
No
2 Turn the ignition off.
Inspect the ABM connector, affected Wheel Speed Sensor, and affected Wheel Speed
Sensor connector.
Is the affected Wheel Speed Sensor or any of the connector(s) damaged?
Yes → Repair as necessary.
→ Go To 3
No
3 Turn the ignition off.
Disconnect the affected Wheel Speed Sensor connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage between affected Wheel Speed Sensor 12 Volt Supply circuit and
ground.
Is the voltage above 10 volts?
Yes → Go To 6
→ Go To 4
No
4 Turn the ignition off.
Disconnect the ABM harness connector.
Disconnect the affected Wheel Speed Sensor connector.
Using a 12-volt test light connected to 12-volts, probe the affected Wheel Speed
Sensor 12 Volt Supply circuit.
Does the test light illuminate?
Yes → Repair the affected Wheel Speed Sensor 12 Volt Supply circuit for
→ Go To 5
No
ACTION
Perform ABS VERIFICATION TEST - VER 1.
a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
18
Continued
APPLICABILITY
All
All
All
All