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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 585 (On-Board Diagnostic [Dynamic Stability Control)) >> DTC C0040:13/C0040:64 [Dynamic Stability Control (DSC)] >> Diagnostic procedure

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 PID FOR BRAKE SWITCH MALFUNCTION 
 Yes Go to Step 11.
No The PID value is continuously On whether the brake pedal is depressed or not
  • Go to Step 8

The PID value is continuously Off whether the brake pedal is depressed or not
  • Go to the next step
2 INSPECT FUSE 
  • Switch the ignition to off
  • Disconnect the negative battery cable.
  • Remove the STOP 10 A fuse
  • Inspect the fuse.
  • Is there any malfunction?
 Yes Replace the fuse, then go to Step 11
No Install the fuse, then go to the next step.
3 INSPECT BRAKE SWITCH POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT 
  • Reconnect the negative battery cable
  • Measure the voltage between brake switch terminal B (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 Yes Go to Step 5.
No Go to the next step.
4 INSPECT BRAKE SWITCH CONNECTOR CONDITION 
  • Disconnect the negative battery cable.
  • Disconnect the brake switch connector
  • Inspect the connector and terminals (corrosion, damage, pin disconnection).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminals.
Replace the brake switch, then go to Step 11.
(See BRAKE PEDAL REMOVAL/INSTALLATION .)
No Repair or replace the wiring harness for a possible short to ground or open circuit.
Replace the brake switch, then go to Step 11.
(See BRAKE PEDAL REMOVAL/INSTALLATION .)
5 INSPECT DSC HU/CM CONNECTOR CONDITION 
  • Disconnect the negative battery cable
  • Disconnect the DSC 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 11
No Go to the next step.
6 INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Inspect for continuity between brake switch terminal D (wiring harness-side) and DSC HU/CM terminal C (wiring harness-side).
  • Is there continuity?
 Yes Replace the brake switch, then go to Step 11.
(See BRAKE PEDAL REMOVAL/INSTALLATION .)
No Go to the next step.
7 INSPECT BRAKE SWITCH CONNECTOR CONDITION 
  • Disconnect the brake switch connector.
  • Inspect the connector and terminals (corrosion, damage, pin disconnection).
  • Is there any malfunction?
 Yes Repair or replace the connector or terminals.
Replace the brake switch, then go to Step 11.
(See BRAKE PEDAL REMOVAL/INSTALLATION .)
No Repair or replace the wiring harness for a possible short to ground or open circuit.
Replace the brake switch, then go to Step 11.
(See BRAKE PEDAL REMOVAL/INSTALLATION .)
8 INSPECT DSC HU/CM CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Disconnect the DSC 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 11
No Go to the next step.
9 INSPECT BRAKE SWITCH CONNECTOR CONDITION 
  • Disconnect the brake switch connector
  • Inspect the connector and terminals (corrosion, damage, pin disconnection)
  • Is there any malfunction?
 Yes Repair or replace the connector or terminals.
Replace the brake switch, then go to Step 11.
(See BRAKE PEDAL REMOVAL/INSTALLATION .)
No Go to the next step.
10 INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Reconnect the negative battery cable.
  • Measure the voltage between DSC HU/CM terminal C (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 Yes Repair or replace the wiring harness for a possible short to power supply.
Replace the brake switch, then go to the next step.
(See BRAKE PEDAL REMOVAL/INSTALLATION .)
No Replace the brake switch, then go to the next step.
(See BRAKE PEDAL REMOVAL/INSTALLATION .)
11 VERIFY DTC TROUBLESHOOTING COMPLETED 
 Yes Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC HU/CM, then go to the next step
(See DSC HU/CM REMOVAL/INSTALLATION .)
No Go to the next step.
12 VERIFY AFTER REPAIR PROCEDURE 
  • Are any DTCs present?
 Yes Go to the applicable DTC inspection
(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] )
No DTC troubleshooting completed.
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