P1554

DTC P1554

CIRCUIT DESCRIPTION
The PCM has the ability to inhibit cruise control operation if conditions exist that would make cruise operation undesirable. The following conditions may inhibit cruise control operation:
- The engine speed is too high or too low.
- The vehicle speed is too high or too low.
- The traction control has been active for longer than 1 second.
- The vehicle acceleration or deceleration rate is too high.

If any of these conditions are present, the PCM will remove the ground from the cruise inhibit circuit.

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 engaged signal from the cruise control module, while inhibiting cruise control operation.

ACTION TAKEN WHEN THE DTC SETS
- The PCM will not illuminate the malfunction indicator lamp (MIL).
- The PCM will store the conditions present when the DTC sets as Fail Records data only.

CONDITIONS FOR CLEARING THE DTC
- The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
- The DTC can be cleared by using the scan tool's Clear DTC Information function.

DIAGNOSTIC AIDS
If the conditions is intermittent, refer to Testing for Intermittent and Poor Connections Intermittent Conditions in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-3:

Steps 4-9:

The numbers below refer to the step numbers on the Diagnostic Table.
3. Tests the PCM's ability to correctly read the signal voltage.
5. Tests for a short on the cruise engaged signal circuit.
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.