Manual Trans

P0501-VEHICLE SPEED SENSOR #1 PERFORMANCE (MANUAL TRANS)







- When Monitored:
With the engine running. Transmission not in park or neutral. Engine rpm greater than 1500.

- Set Condition:
The PCM does not receive a vehicle speed sensor signal for more than 11 seconds. 2 consecutive trips.





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

1. ACTIVE DTC
1. Ignition on, engine not running.
2. With a scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition Test.

2. (F856) 5 VOLT SUPPLY CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the Vehicle Speed Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (F856) 5 Volt Supply circuit in the VSS harness connector.

Is the voltage above 4.6 volts?

Yes

- Go To 3

No

- Repair the (F856) 5 Volt Supply circuit for an open.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

3. VSS SIGNAL




1. Measure the voltage of the (K75) VSS Signal circuit in the VSS harness connector.

Is the voltage between 4.5 to 5.0 volts?

Yes

- Go To 4

No

- Go To 5

4. (K914) SENSOR GROUND CIRCUIT OPEN





CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis.

1. Measure the resistance of the (K914) VSS Sensor Ground circuit between the VSS harness connector and to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

- Remove and inspect the Pinion Gear. If OK, replace the Vehicle Speed Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Repair the (K914) Sensor ground circuit for an open.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

5. (K75) VSS SIGNAL CIRCUIT SHORTED TO GROUND




1. Disconnect the PCM harness connector.
2. Measure the resistance of the (K75) Vehicle Speed Sensor Signal circuit in the VSS harness connector to ground.

Is the resistance below 100 ohms?

Yes

- Repair the (K75) VSS Signal circuit for a short to ground.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Go To 6

6. (K75) VSS SIGNAL CIRCUIT OPEN





CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install PCM Pinout Box 8815 to perform diagnosis.

1. Measure the resistance of the (K75) VSS Signal circuit between the VSS harness connector and to the appropriate terminal of special tool #8815.

Is the resistance below 5 ohms?

Yes

- Go To 7

No

- Repair the (K75) VSS Signal circuit for an open.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

7. PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

If there are no possible causes remaining, view repair,

Repair

- Replace and program the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.