Cruise Control (ECM/PCM) Input Test (2016-18)

NOTE: Always make sure that you have the latest HDS software.

1. Connect the HDS to the DLC - Refer to: How to Troubleshoot the Fuel and Emissions Systems (2016-18), or How to Troubleshoot the A/T System (2016-18) .

2. Press the engine start/stop button to select the ON mode.

3. Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, troubleshoot the DLC circuit .

4. 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.

5. If no DTCs are found, do the following tests while monitoring parameters in the DATA LIST with the HDS.

6. 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. Check for DTCs in the PGM-FI system and do the appropriate troubleshooting. Faulty gauge control module Faulty cruise control combination switch An open in the wire between the gauge control module and the cruise control combination switch A short to power in the wire between the gauge control module and the cruise control combination switch when the illumination switch is turned on If the CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list indicates SIGNAL SHORT, check as shown. Check for DTCs in the PGM-FI system and do the appropriate troubleshooting Faulty gauge control module Faulty cruise control combination switch A short to ground in the wire between the gauge control module and the cruise control combination switch 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 CRUISE SW when the CRUISE button is pressed.
	CANCEL button is pressed	CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list should indicate CANCEL SW when the CANCEL button is pressed.
	DECEL SET button is pressed	CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list should indicate SET SW when the DECEL SET button is pressed.
	RES ACCEL button is pressed	CRUISE CONTROL SYSTEM SWITCH STATUS in the HDS data list should indicate RESUME SW when the RES ACCEL button is pressed.
Cruise control indicator signal	Start the engine, press the cruise control CRUISE button on and drive the vehicle above 19 mph (30 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.	Faulty gauge control module Faulty cruise control combination switch An open in the wire between the gauge control module and the cruise control combination switch A wire shorted to ground between the gauge control module and the cruise control combination switch

Signal to be tested	Test condition	Parameter: Desired result	Possible cause if result is not obtained
Brake pedal position switch signal	Brake pedal pressed, then released	CRUISE BRAKE SW should indicate OPEN when the brake pedal is pressed and CLOSE when the brake pedal is released.	Faulty brake pedal position switch Blown No. B2 (15 A) fuse in the under-dash fuse/relay box An open in the wire between the No. B2 (15 A) fuse in the under-dash fuse/relay box and the brake pedal position switch An open in the wire between the PCM and the brake pedal position switch A wire shorted to ground or power between the PCM and the brake pedal position switch