Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Cruise Control (ECM/PCM) Input Test
NOTE: Always make sure that you have the latest HDS software.
2. Select PGM-FI system and check the diagnostic trouble code (DTC) in the DTC MENU on the screen and note it. Also check the freeze data and/or onboard snapshot data, and download any data found. Then refer to the indicated DTC's troubleshooting, and begin the appropriate troubleshooting procedure.
3. If no DTCs are found, do the following tests while monitoring parameters in the DATA LIST with the HDS. If the input tests prove OK, replace the PCM
NOTE: Intermittent failures are often caused by loose circuit connections. While monitoring cruise control inputs, flex the circuit wires, and note if any of the test results change.
| Signal to be tested | Test condition | Parameter: Desired result | Possible cause if result is not obtained |
|---|---|---|---|
| Cruise control system switch status | Cruise control combination switch buttons are not pressed | CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list should indicate DEFAULT when the cruise control combination switch buttons are not pressed. | If the CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list indicates SIGNAL LOST, check as shown:
If the CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list indicates SIGNAL SHORT, check as shown:
If the CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list indicates a different status, check for a faulty cruise control combination switch. |
| CRUISE button is pressed | CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list should indicate MAIN switch when the CRUISE button is pressed. | ||
| CANCEL button is pressed | CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list should indicate CANCEL switch when the CANCEL button is pressed. | ||
| SET/- button is pressed | CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list should indicate SET switch when the SET/- button is pressed. | ||
| RES/+ button is pressed | CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list should indicate RES switch when the RES/+ button is pressed. |
| Signal to be tested | Test condition | Parameter: Desired result | Possible cause if result is not obtained |
|---|---|---|---|
| Cruise control indicator signal | Start the engine, press the CRUISE button on and drive the vehicle above 25 mph (40 km/h) with the cruise control set and cancel the cruise control | CRUISE INDICATOR should indicate ON when the cruise control is set and OFF when the cruise control is canceled. |
|
| Brake pedal position switch signal | Brake pedal is pressed, then released | CRUISE BRAKE SW should indicate OPEN when the brake pedal is pressed and CLOSE when the brake pedal is released. |
|
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.