Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

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 FREEZE FRAME DATA on 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	INSPECT BRAKE SWITCH NO. 1 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT Switch the ignition to ON (engine off). Measure the voltage between brake switch terminal B (wiring harness-side) and body ground Is the voltage B+ ?	Yes	Go to the next step
3		No	Go to Step 8.
4	INSPECT PCM CONNECTOR CONDITION Switch the ignition 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 and/or connector, then go to Step 9
4		No	Go to the next step
5	INSPECT BRAKE SWITCH NO. 1 SIGNAL CIRCUIT FOR SHORT TO GROUND Inspect for continuity between brake switch terminal D (wiring harness-side) and body ground. Is there continuity?	Yes	Go to Step 8
5		No	Go to the next step
6	INSPECT BRAKE SWITCH NO. 1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY Switch the ignition to ON (engine off) Measure the voltage between PCM terminal 1AB (wiring harness-side) and body ground Is there any voltage?	Yes	Go to Step 8.
6		No	Go to the next step.
7	INSPECT BRAKE SWITCH NO. 1 SIGNAL CIRCUIT FOR OPEN CIRCUIT Switch the ignition to off. Inspect for continuity between brake switch terminal D (wiring harness-side) and PCM terminal 1AB (wiring harness-side). Is there continuity?	Yes	Go to the next step
7		No	Go to the next step.
8	INSPECT BRAKE SWITCH CONNECTOR CONDITION Switch the ignition to 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 and/or connector. Replace the brake switch No 1, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION .)
8		No	There is a malfunction in wiring harness Repair or replace the malfunctioning wiring harness. Replace the brake switch No. 1, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION .) There is no malfunction in wiring harness Replace the brake switch No 1, then go to the next step. (See BRAKE PEDAL REMOVAL/INSTALLATION .)
9	VERIFY DTC TROUBLESHOOTING COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS Drive the vehicle Repeat deceleration 8 times under both of the following conditions: Vehicle speed: from above 30 km/h {19 mph} to 30 km/h {19 mph} or less Deceleration rate, exceed 3.8 km/h {2.4 mph} per 0.1 s Is the same DTC or PENDING CODE present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L5] .)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L5] .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L5] .)
10		No	DTC troubleshooting completed.