The powertrain control module (PCM) inhibits cruise control operation when certain conditions are not appropriate for cruise control operation. The PCM removes the ground from the cruise control inhibit signal circuit in order to disengage cruise control operation.
The PCM is commanding the cruise control module to inhibit cruise control operation.
• | 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. |
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.
• | 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. |
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.
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Cruise Control Schematics | |||
1 | Did you perform A Diagnostic System Check - Cruise Control? | Go to Step 2 | |
2 |
Is DTC P1585 also set? | Go to DTC P1585 | Go to Step 3 |
3 | With a scan tool, observe the Cruise Active display. Does the Cruise Active display indicate YES? | Go to Step 5 | Go to Step 4 |
4 |
Does the scan tool indicate that DTC P1554 failed this ignition? | Go to Step 5 | Go to Diagnostic Aids |
5 |
Does the Cruise Active display indicate YES? | Go to Step 6 | Go to Step 7 |
6 |
Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
7 | Replace the cruise control module. Refer to Cruise Control Module Replacement . Did you complete the replacement? | Go to Step 9 | -- |
Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Programming 3.1L or Powertrain Control Module Programming 3.8L in Engine Controls. Replace the PCM. Refer to Powertrain Control Module Replacement 3.1L or Powertrain Control Module Replacement 3.8L in Engine Controls. Did you complete the repair? | Go to Step 9 | -- | |
9 |
Does the DTC reset? | Go to Step 2 | System OK |