LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2007 >> 6 Mazdaspeed >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System L3 With TC] >> DTC P0703 >> Diagnostic procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic procedure

DTC P0703 DIAGNOSTIC PROCEDURE

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