P1554

CIRCUIT DESCRIPTION
The PCM inhibits cruise control operation when certain conditions are directed. The PCM provides a ground for the cruise control inhibit signal circuit in order to disengage the cruise control operation.

CONDITIONS FOR RUNNING THE DTC
The PCM is commanding the cruise control module to inhibit cruise control operation.

CONDITIONS FOR SETTING THE DTC
^ The PCM detects a cruise control engaged signal from the cruise control module, while inhibiting cruise control operation.
^ The above conditions are present for more than 1 second.

ACTION TAKEN WHEN THE DTC SETS
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

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

DIAGNOSTIC AIDS
Check for the following conditions:
^ A faulty connection at the PCM. Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connections. Use a corresponding mating terminal to test for proper terminal tension.
^ Inspect the wiring harness for damage. If the harness appears to be OK, observe the Cruise Status display on the scan tool while moving the connectors and wiring harnesses related to the cruise control module. A change in the display will indicate the location of the malfunction.

If DTC P1554 cannot be duplicated, the information included in the Failure Records data can be useful in determining how many ignition cycles have passed since the DTC was last set.

TEST DESCRIPTION

Steps 1-9:

The numbers below refer to the step numbers on the diagnostic table.
8. This vehicle is equipped with a PCM which utilizes an electrically erasable programmable read-only memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.