P0608

DTC P0608

CIRCUIT DESCRIPTION
The powertrain control module (PCM) creates the vehicle speed signal by pulsing the signal circuit to ground. The PCM pulses the circuit at the same rate as the vehicle speed signal input. The PCM monitors the voltage on the vehicle speed signal circuit. If the PCM determines the voltage is out of the normal operating range, a DTC sets.

CONDITIONS FOR RUNNING THE DTC
- The engine speed is greater than 400 RPM.
- The ignition voltage is between 9-18 volts.

CONDITIONS FOR SETTING THE DTC
- The PCM detects that the commanded state of the driver and the actual state of the control circuit do not match.
- The condition must be present for a minimum of 5 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The PCM stores a DTC P0608 in memory.
- The PCM records the operating conditions at the time the DTC sets. The PCM displays the failure information in the Failure Records on the scan tool.

CONDITIONS FOR CLEARING THE DTC
- The history DTC clears after 40 malfunction free warm-up cycles.
- The DTC becomes history when the conditions for setting the DTC are no longer present.
- The PCM receives the clear code command from the scan tool.

DIAGNOSTIC AIDS
- If any additional powertrain DTCs are stored, refer to:
- Diagnostic Trouble Code (DTC) List in Computers and Control Systems 4.3 L. Diagnostic Trouble Code Descriptions
- Diagnostic Trouble Code (DTC) List in Computers and Control Systems 4.8 L, 5.3 L and 6.0 L. Diagnostic Trouble Code Descriptions

TEST

Steps 1-2:

Steps 3-8:

Steps 9-11: