P1502

P1502-VEHICLE SPEED SENSOR 1/2 CORRELATION - NON-DRIVE WHEELS



- When Monitored:
With the engine running, transmission not neutral, brakes not applied, and engine RPM greater than 1500.

- Set Condition:
This code will set if the PCM receives an implausible vehicle speed signal from the TIPM Module.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ACTIVE DTC
1. Ignition on, engine not running.

NOTE: Check for any Bus Communication DTCs. If no Bus or Communication DTCs are set, check for active Vehicle Speed Sensor DTCs in the Totally Integrated Power Module. Any bus, communication, or VSS DTCs in the TIPM must be properly diagnosed before continuing.

2. With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC.

2. VISUAL INSPECTION

NOTE: This code may set after a hard acceleration on loose gravel, during other off road driving conditions, or by any condition that causes a wheel speed difference between the front and rear wheels.

1. Perform a thorough inspection of the rear Wheel Speed Sensor, wiring, connector, attaching hardware, and tone wheel.
2. Check tire pressure of all the tires.
3. Check tire wear on all the tires.
4. Ask the customer what the road and driving conditions were like when the fault set.

Were any problems found?

Yes

- Repair as necessary. If the code set during a front OR rear wheel spin condition, no repair may be necessary. Perform a thorough road test to verify proper operation.
- Perform the PCM Verification Test. PCM Verification Test.

No

- Go To 3

3. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors related to this circuit.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification Test. PCM Verification Test.

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification Test. PCM Verification Test.