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	INSPECT FUSE Switch the ignition to off Disconnect the negative battery cable Remove the following fuses MAIN 125 A fuse ABS MOTOR 60 A fuse IG KEY1 40 A fuse ABS SOL 30 A fuse SAS 5 A fuse Inspect the fuses Are there any malfunction?	Yes	Replace the malfunctioning fuse, then go to Step 8
1		No	Install the fuses, then go to the next step.
2	INSPECT BATTERY Inspect the battery (See BATTERY INSPECTION [L5] .) (See BATTERY INSPECTION [MZI-3.7] .) Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 8. (See BATTERY RECHARGING [L5] .) (See BATTERY RECHARGING [MZI-3.7] .) (See BATTERY REMOVAL/INSTALLATION [L5] .) (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)
2		No	Go to the next step.
3	INSPECT GENERATOR Inspect the generator (See GENERATOR INSPECTION [L5] .) (See GENERATOR INSPECTION [MZI-3.7] .) Is there any malfunction?	Yes	Replace the generator, then go to Step 8. (See GENERATOR REMOVAL/INSTALLATION [L5] .) (See GENERATOR REMOVAL/INSTALLATION [MZI-3.7] .)
3		No	Go to the next step.
4	INSPECT IGNITION SWITCH CONNECTOR CONDITION Disconnect the ignition switch connector Inspect the connector and terminals (corrosion, damage, pin disconnection) Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 8.
4		No	Go to the next step.
5	INSPECT IGNITION SWITCH Inspect the ignition switch (See IGNITION SWITCH INSPECTION [WITHOUT ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] .) Is there any malfunction?	Yes	Replace the ignition switch, then go to Step 8 (See IGNITION SWITCH REMOVAL/INSTALLATION [WITHOUT ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM] .)
5		No	Go to the next step.
6	INSPECT ABS/TCS HU/CM CONNECTOR CONDITION Disconnect the ABS/TCS HU/CM connector Inspect the connector and terminals (corrosion, damage, pin disconnection) Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 8
6		No	Go to the next step.
7	INSPECT BATTERY POWER SUPPLY CIRCUIT FOR SHORT OR OPEN CIRCUIT Reconnect the ignition switch connector Reconnect the negative battery cable Switch the ignition to ON Measure the voltage between following terminals and body ground ABS/TCS HU/CM terminal AG (wiring harness-side) ABS/TCS HU/CM terminal AH (wiring harness-side) ABS/TCS HU/CM terminal AF (wiring harness-side) Is the voltage B+ ?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible short to ground or open circuit, then go to the next step.
8	VERIFY DTC TROUBLESHOOTING COMPLETED Make sure to reconnect the disconnected connectors Reconnect the negative battery cable Clear the DTC from the ABS/TCS HU/CM memory using the M-MDS (See ON-BOARD DIAGNOSIS [ABS/TCS] .) Drive the vehicle at speed of 20 km/h {12 mph} or more Gradually slow down and stop the vehicle. Perform the ABS/TCS HU/CM DTC inspection. (See ON-BOARD DIAGNOSIS [ABS/TCS] .) Is the same DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the ABS/TCS HU/CM, then go to the next step. (See ABS/TCS HU/CM REMOVAL/INSTALLATION .)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [ABS/TCS] .)
9	VERIFY AFTER REPAIR PROCEDURE Are any DTCs present?	No	DTC troubleshooting completed