Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY OPEN OR SHORT CIRCUIT IN BRAKE SWITCH SIGNAL Measure the voltage between the DSC HU/CM connector terminal C (vehicle harness-side) and body ground when the brake pedal is depressed and released. Brake pedal depressed: B+ Brake pedal released: 1 V or less Is the voltage normal?	Yes	Go to the Step 5.
1		No	If it is B+ under any condition, then go to the next step. If it is 1 V or less under any condition, then go to Step 4.
2	INSPECT BRAKE SWITCH SIGNAL FOR SHORT TO POWER SUPPLY SUPPLY Disconnect the brake switch connector. Measure voltage between the brake switch connector terminal D (vehicle harness-side) and body ground. Is the voltage 1 V or less ?	Yes	Go to Step 3.
2		No	Refer to the wiring diagram and verify whether or not there is a common connector between the PCM and brake switch. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to power supply. Go to Step 5.
3	INSPECT BRAKE SWITCH Inspect the brake switch. (See BRAKE SWITCH INSPECTION .) Is the brake switch normal?	Yes	Go to the next step.
3		No	Replace the brake switch, then go to the Step 5. (See BRAKE PEDAL REMOVAL/INSTALLATION .)
4	VERIFY PCM DTC Using the M-MDS, perform the PCM DTC inspection. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.5] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.5] .) DTC troubleshooting completed, then go to Step 5.
4		No	Go to the next step.
5	VERIFY NO ABNORMALITY ON BRAKE FLUID PRESSURE SENSOR Using the M-MDS, clear the DTC from the DSC HU/CM. (See CLEARING DTC [DYNAMIC STABILITY CONTROL (DSC)] .) Start the engine and drive the vehicle at 40 km/h {25 mph} or more. Gradually slow down and stop vehicle. Using the M-MDS, perform the DSC HU/CM DTC inspection. (See DTC INSPECTION [DYNAMIC STABILITY CONTROL (DSC)] .) Is the same DTC present?	Yes	Repeat the inspection from Step1. If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION .)
5		No	Go to the next step.
6	VERIFY DTC TROUBLESHOOTING COMPLETED Using the M-MDS, clear the DTC from the DSC HU/CM. (See CLEARING DTC [DYNAMIC STABILITY CONTROL (DSC)] .) Start the engine and drive the vehicle at 40 km/h {25 mph} or more. Gradually slow down and stop vehicle. Using the M-MDS, perform the DSC HU/CM DTC inspection. (See DTC INSPECTION [DYNAMIC STABILITY CONTROL (DSC)] .) Is the same DTC present?	Yes	Replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION .)
6		No	Go to the next step.
7	VERIFY NO DTC IS PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DYNAMIC STABILITY CONTROL (DSC)] .)
7	VERIFY NO DTC IS PRESENT Are any DTCs present?	No	DTC troubleshooting completed.