DTC 42

DTC 42 Diagnostic Chart - Part 1 0f 2:

DTC 42 Diagnostic Chart - Part 2 0f 2:

Vehicle Speed Sensor Circuit:

Circuit Description:
The vehicle speed sensor (VSS) is an electronic relay that is mounted on the transaxle. As the transaxle turns the VSS, the VSS provides the speedometer with a vehicle speed input (voltage pulses). This input is used to drive the speedometer. The speedometer then converts the vehicle speed input into a more precise waveform and provides the powertrain control module (PCM) and the cruise control module with its own vehicle speed input. The PCM converts this input (ground pulses) into a vehicle speed.

DTC 42 will set if the following condition is met for at least 8 seconds:
Vehicle speed input not sensed at the PCM with engine speed between between 3,00O and 5,000 rpm with the transaxle in gear.

Test Description:
Numbers below refer to circled numbers 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 PCM speed input circuit or for a faulty PCM.

4. This determines if the PCM 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 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 hamess connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal-to-wire connections before component replacement.