Mazda 6 Workshop Manual page 148

Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related repair information available?
3 VERIFY CURRENT SIGNAL STATUS: IS
CONCERN INTERMITTENT OR CONSTANT?
• Connect the WDS or equivalent to the DLC-2.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
4 INSPECT BRAKE SWITCH CONNECTOR FOR
POOR CONNECTION
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
5 INSPECT BRAKE SWITCH 1 POWER SUPPLY
CIRCUIT FOR OPEN
• Turn the engine switch to the ON position
(Engine off).
• Inspect the voltage between brake switch
terminal B and body GND.
• Is the voltage B+?
6 INSPECT BRAKE SWITCH 2 GND CIRCUIT FOR
OPEN
• Turn the engine switch off.
• Inspect for continuity between brake switch
terminal C and body GND.
• Is there continuity?
7 INSPECT BRAKE SWITCH 1 SIGNAL CIRCUIT
FOR SHORT TO POWER
• Turn the engine switch to the ON position
(Engine off).
• Inspect the voltage between brake switch
terminal D and body GND.
• Is the voltage less than 1.0 V?
8 INSPECT BRAKE SWITCH 2 SIGNAL CIRCUIT
FOR OPEN
• Turn the engine switch to the ON position
(Engine off).
• Inspect the voltage between brake switch
terminal A and body GND.
• Is the voltage less than 1.0 V?
9 INSPECT BRAKE SWITCH 2 SIGNAL CIRCUIT
FOR SHORT TO GND
• Turn the engine switch off.
• Inspect for continuity between brake switch
terminal A and body GND.
• Is there continuity?
10 INSPECT BRAKE SWITCH
• Inspect brake switch.
• Is there any malfunction?
11 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
F2–136
ON-BOARD DIAGNOSTIC
INSPECTION
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order,
then go to the next step.
Yes Perform repair or diagnosis according to the available
Service Information.
• If the vehicle is not repaired, go to the next step.
No Go to the next step.
Yes Go to the next step.
No Intermittent concern exists.
Perform the "INTERMITTENT CONCERNS
TROUBLESHOOTING".
Yes Repair or replace the suspected terminal, go to Step 15.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness for an open, go to
Step 15.
Yes Go to the next step.
No Repair or replace the wiring harness for an open, go to
Step 15.
Yes Go to the next step.
No Repair or replace the wiring harness for a short to power
supply, go to Step 15.
Yes Repair or replace the wiring harness for an open circuit, go
to Step 15.
No Go to the next step.
Yes Repair or replace the wiring harness for a short to GND, go
to Step 15.
No Go to the next step.
Yes Replace the brake switch, go to Step 15.
No Go to the next step.
Yes Repair or replace the suspected terminal, go to Step 15.
No Go to the next step.
ACTION