Diagnostic Procedure

DTC P0703 DIAGNOSTIC PROCEDURE TABLE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	CLASSIFY HIGH INPUT OR LOW INPUT Connect the WDS or equivalent to DLC-2. Access BOO PID. Verify BOO PID during brake pedal operation. Is BOO PID always OFF?	Yes	Go to the next step.
3		No	Go to Step 10.
4	INSPECT BRAKE SWITCH CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect the brake switch connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 13.
4		No	Go to the next step.
5	CLASSIFY BRAKE SWITCH OR CIRCUIT Connect the WDS or equivalent to DLC-2. Access BOO PID. Connect a jumper wire between brake switch No.1 terminal B and D. Is BOO PID on?	Yes	Go to the next step.
5		No	Go to Step 7.
6	INSPECT BRAKE SWITCH Inspect the brake switch. (See BRAKE SWITCH INSPECTION .) Is the brake switch normal?	Yes	Go to Step 13.
6		No	Replace the brake switch, then go to Step 13. (See BRAKE PEDAL REMOVAL/INSTALLATION .)
7	INSPECT BRAKE SWITCH POWER CIRCUIT FOR OPEN CIRCUIT Measure the voltage between brake switch terminal B and body ground. Is the voltage B+ ?	Yes	Go to the next step.
7		No	Repair or replace the brake switch power circuit for open, then go to Step 13.
8	INSPECT PCM CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 13.
8		No	Go to the next step.
9	INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT Inspect for continuity between brake switch terminal D and PCM terminal 1AB. Is there continuity?	Yes	Go to Step 13.
9		No	Repair or replace the wiring harness for an open circuit, then go to Step 13.
10	CLASSIFY BRAKE SWITCH OR CI Connect the WDS or equivalent to DLC-2. Access BOO PID. Verify that BOO PID changes from ON to OFF when the brake switch connector disconnected. Does BOO PID change from ON to OFF?	Yes	Go to the next step.
10		No	Go to Step 12.
11	INSPECT BRAKE SWITCH Inspect the brake switch. (See BRAKE SWITCH INSPECTION .) Is the brake switch normal?	Yes	Go to Step 13.
11		No	Replace the brake switch, then go to Step 13. (See BRAKE PEDAL REMOVAL/INSTALLATION .)
12	INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY Measure the voltage between brake switch terminal D and body ground. Is the voltage B+ ?	Yes	Repair or replace the wiring harness for short to power supply, then go to the next step.
12		No	Go to the next step.
13	VERIFY TROUBLESHOOTING OF DTC P0703 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the WDS or equivalent. Drive the vehicle 30 km/h {18.6 mph} or more. Depress and release the brake pedal more than 8 times while driving vehicle. Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
13		No	Go to the next step.
14	VERIFY AFTER REPAIR PROCEDURE. Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .) Are any DTC present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE .)
14		No	Troubleshooting completed.