GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2003 🢒 Aztek - AWD 🢒 DTC 🢒 DTC P1554

Circuit Description

The powertrain control module (PCM) has the ability to inhibit cruise control operation if conditions exist that would make cruise operation undesirable. The PCM removes the ground from the cruise control inhibit circuit in order to disengage cruise control operation. 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.

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 set as Failure Records data only.

Conditions for Clearing the DTC
    • The DTC becomes history when the conditions for setting the DTC are no longer present.
    • A history DTC will clear after 40 malfunction free warm-up cycles.
    • The PCM receives a clear code command from the scan tool.

Diagnostic Aids

If the DTC is a history DTC, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Step

Action

Yes

No

Schematic Reference: Cruise Control Schematics

1

Did you perform the Cruise Control Diagnostic System Check?

Go to Step  2

Go to Diagnostic System Check - Cruise Control

2

Is DTC P1585 also set?

Go to DTC P1585

Go to Step 3

3

  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With a scan tool, observe the Cruise Control Active parameter in the Engine Data 1 data list.

Does the Cruise Control Active parameter display yes?

Go to Step 7

Go to Step 4

4

  1. Turn the ignition OFF.
  2. Disconnect the cruise control module.
  3. Turn the ignition ON, with the engine OFF.
  4. With the scan tool, observe the Cruise Control Active parameter.

Does the Cruise Control Active parameter display No?

Go to Step 6

Go to Step 5

5

Test the cruise engaged signal circuit for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 7

6

Inspect for poor connections at the harness connector of the cruise control module. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the cruise control module. Refer to Cruise Control Module Replacement .

Did you complete the replacement?

Go to Step 10

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9

Important: Program the replacement PCM. Refer to Service Programming System (SPS) in Programming.

Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls.

Did you complete the replacement?

Go to Step 10

--

10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK