4A49

4A49 DYNAMICS SENSOR-IMPLAUSIBLE SIGNAL/NO SIGNAL





For a complete wiring diagram consult Diagrams/Electrical Electrical Diagrams.


- When Monitored:

With the ignition on.

- Set Condition:

When the Anti-Lock Brake Module is unable to communicate with the Dynamics Sensor.








Diagnostic Test


1. CHECK FOR A DTC 4A49 DYNAMICS SENSOR-IMPLAUSIBLE SIGNAL/NO SIGNAL

NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.

With the scan tool, read and record DTCs.

With the scan tool, read and record Freeze Frame information.

With the scan tool, erase DTCs.

Cycle the ignition switch from off to on.

With the scan tool, read and record DTCs.

Does the scan tool display: 4A49 DYNAMICS SENSOR-IMPLAUSIBLE SIGNAL/NO SIGNAL?

Yes

- Go To 2

No

- Refer to the ABS INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection
- Perform ABS VERIFICATION TEST. ABS Verification Test



2. CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE

Check the Dynamics Sensor installation.

Check all related wiring for bruised, chafed, pierced, or partially broken wires.

Check all related connectors for broken, bent, pushed out, or corroded terminals.

Were any problems found?

Yes

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

No

- Go To 3



3. FUSED IGNITION SWITCH OUTPUT CIRCUIT





Turn the ignition off.

Disconnect the Dynamics Sensor harness connector.

Turn the ignition on.

Measure the voltage of the Fused Ignition Switch Output circuit at the Dynamics Sensor harness connector.

Is the voltage above 10 volts?

Yes

- Go To 4

No

- Repair the Fused Ignition Switch Output circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test



4. GROUND CIRCUIT OPEN





Turn the ignition off.

Measure the resistance between the Ground circuit and ground.

Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the Ground circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test



5. DYNAMICS SENSOR HIGH DATA LINK CIRCUIT OPEN





Turn the ignition off.

Measure the resistance of the Dynamics Sensor High Data Link circuit between the Anti-lock Brake Module and the Dynamics Sensor.

Is the resistance below 5.0 ohms?

Yes

- Go To 6

No

- Repair the Dynamics Sensor High Data Link circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test



6. CHECK THE DYNAMICS SENSOR LOW DATA LINK CIRCUIT FOR AN OPEN





Turn the ignition off.

Measure the resistance of the Dynamics Sensor Low Data Link circuit between the Anti-lock Brake Module and the Dynamics Sensor.

Is the resistance below 5.0 ohms?

Yes

- Go To 7

No

- Repair the Dynamics Sensor Low Data Link circuit for an open.
- Perform ABS VERIFICATION TEST. ABS Verification Test



7. DYNAMICS SENSOR

Measure the voltage of the Dynamics Sensor High Data Link circuit at the Dynamics Sensor harness connector.

Measure the voltage of the Dynamics Sensor Low Data Link circuit at the Dynamics Sensor harness connector.

Is voltage within 2-3 volts on each circuit?

Yes

- Replace the Dynamics Sensor.
- Perform ABS VERIFICATION TEST. ABS Verification Test

No

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