Vehicle Speed Sensor: Testing and Inspection

Open/Shorted VSS Circuit - Part 1 Of 2:

Open/Shorted VSS Circuit - Part 2 0f 2:

Vehicle Speed Sensor Circuit:

Component Failure Mode
DTC 42 will set if the following condition is met for at least 8 seconds:

^ Vehicle speed input not sensed at the ECM with engine speed between between 3,000 and 5,000 rpm with the transaxle in gear.


Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This determines if the VSS is functioning normally.

2. This checks for an open in the power feed to the VSS.

3. This checks for an open or short in the ECM speed input circuit or for a faulty ECM.

4. This determines if the ECM or the speedometer is faulty.

5. This checks for an open in the ground to the VSS.

6. This checks for an open in the power feed to the speedometer.

7. This determines if the VSS or the speedometer is faulty.

Diagnostic Aids:
Check G202 for a clean and tight connection. An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal-to-wire connections before component replacement.