4000 - 4999: 4290

4290- RPM SENSOR CIRCUIT HIGH





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

- Set Condition:
When the Wheel Speed Sensor (WSS) is shorted to B(+).





Diagnostic Test

1. CHECK FOR DTC 4290-RPM SENSOR CIRCUIT HIGH
NOTE: This DTC must be active for the results of this test to be valid.

NOTE: If any other DTCs are present, refer to appropriate diagnosis before continuing with this test.

Turn the ignition on.
With the scan tool, record and erase DTCs.
Road test the vehicle over 40 km/h (25 mph).

NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.

With the scan tool, read DTCs.
Does the scan tool display: 4290-RPM SENSOR CIRCUIT HIGH active?

Yes

- Go To 2


No

- Go To 7

2. CHECK WHEEL SPEED SENSOR SIGNALS
Turn the ignition on.
With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle.
Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).
Are any of the WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior?

Yes

- Go To 3

No

- Repair the WSS Signal circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. Verification Tests.

3. CHECK WSS SIGNAL CIRCUIT SHORT TO VOLTAGE
Turn the ignition on.
Remove all jumper wires.
Measure the voltage between the WSS Signal circuit and ground on the WSS in question.
Is the voltage above one volt?

Yes

- Repair the WSS Signal circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. Verification Tests.

No

- Go To4

4. CHECK WSS SIGNAL CIRCUIT SHORT TO VOLTAGE
Measure the voltage between the WSS Signal circuit and ground on the WSS in question.
Is the voltage above one volt?

Yes

- Repair the WSS Signal circuit for a short to voltage.
- Perform ABS VERIFICATION TEST. Verification Tests.

No

- Go To5

5. CHECK WSS SIGNAL CIRCUIT AND WSS SUPPLY CIRCUIT SHORT TOGETHER
Turn the ignition off.
Measure the resistance between the WSS Signal circuit and the WSS Supply circuit on the WSS in question.
Is the resistance above 5.0 ohms?

Yes

Go To 6

No

- Repair the WSS Signal circuit and the WSS Supply circuit for a short together.
- Perform ABS VERIFICATION TEST. Verification Tests.

6. WHEEL SPEED SENSOR
Replace the Wheel Speed Sensor.
Perform ABS VERIFICATION TEST. Verification Tests.
Road test the vehicle over 40 km/h (25 mph).

NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.

With the scan tool, read ABS DTCs.
Did DTC 4290-RPM SENSOR CIRCUIT HIGH reset?

Yes

- Replace the Anti-Lock Brakes Module.
- Perform ABS VERIFICATION TEST. Verification Tests.

No

- Test Complete.

7. INTERMITTENT 4290- RPM SENSOR CIRCUIT HIGH DTC
The conditions necessary to set this DTC are not present at this time.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Were any problems found?

Yes

- Repair as necessary.
- Perform ABS VERIFICATION TEST. Verification Tests

No

- Test complete.