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Appendix I
SPN
Component
FMI Fault Description
Repair
789
Wheel speed
sensor/tone
ring front axle
left
1
Air gap too large
Tone ring damaged
or corroded
• Check for the correct sensor setting (air gap 0.2 to
1.7 mm).
• Check the bearing clearance and tone ring run out.
Eliminate the cause of the increased air gap and correct the
sensor setting.
• Check the tone ring for damage (missing teeth and
corrosion); replace if necessary.
2
Tire mismatch
•
Check for tire size mismatch.
• Check for correct number of tone ring teeth.
• Verify that ECU is programmed correctly for vehicle.
5
Sensor defective
Open connection
Sensor impedance
out of normal
operating range
•
Check sensor wiring harness and connection for damage/
interruptions.
• Replace sensor if necessary.
7
Tone ring damaged
or corroded
• Check for damaged or missing teeth on the tone ring.
• Verify the tone ring is not corroded or contaminated.
8
Air gap too large
Tone ring damaged
or corroded
• Check for the correct sensor setting (air gap 0.2 to 1.7 mm).
• Check the bearing clearance and tone ring run out.
Eliminate the cause of the increased air gap and correct the
sensor setting.
• Check the tone ring for damage (missing teeth and
corrosion); replace if necessary.
•
Check the sensor for correct installation and bushing/clip for
damage.
9
Air gap too large
Tone ring damaged
or corroded
Noise on sensor
output signal
• Check for the correct sensor setting (air gap 0.2 to 1.7 mm).
• Check the bearing clearance and tone ring run out.
Eliminate the cause of the increased air gap and correct the
sensor setting.
• Check the tone ring for damage (missing teeth and
corrosion); replace if necessary.
•
Check the sensor for correct installation and bushing/clip for
damage.
10
Noise on sensor
output signal
• Check for the correct sensor setting (air gap 0.2 to 1.7 mm).
• Check the bearing clearance and tone ring run out.
Eliminate the cause of the increased air gap and correct the
sensor setting.
• Check the tone ring for damage (missing teeth and
corrosion); replace if necessary.
•
Check the sensor for correct installation and the bushing/clip
for damage.
