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DTC B1318 [DSC]

DTC B1318 [DSC] DETECTION CONDITION AND POSSIBLE CAUSES

DTC B1318 DSC power supply
DETECTION CONDITION 
  • Low voltage is detected at the voltage monitor of solenoid valve monitor, or the motor monitor
POSSIBLE CAUSE 
  • Malfunction of fuse (SAS 10 A)
  • Open or short to power circuit in harness between DSC HU/CM terminal G and battery positive terminal
  • Open circuit in harness between body ground and DSC HU/CM terminal A
  • Battery and/or generator malfunction
G04325864Courtesy of MAZDA MOTORS CORP.
DTC B1318 [DSC] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT BATTERY VOLTAGE 
  • Is battery terminal voltage normal?
 Yes Make sure that battery terminal connection is normal.
Go to next step.
No Charge or replace battery, then go to Step 6.
2 INSPECT BATTERY GRAVITY 
  • Is battery specific gravity as specified?
 Yes Go to next step.
No Replace battery, then go to Step 6.
3 INSPECT CHARGING SYSTEM 
  • Are generator and drive belt tension normal?
 Yes Go to next step.
No Adjust drive belt tension as necessary.
Replace generator and/or drive belt as necessary.
4 INSPECT DSC HU/CM POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT 
  • Start engine.
  • Measure voltage between DSC HU/CM terminal G and ground.
  • Is voltage above 10 V  ?
 Yes Go to next step.
No Go to Step 6.
5 INSPECT DSC HU/CM GROUND CIRCUIT FOR POOR GROUND OR OPEN CIRCUIT 
  • Turn ignition key to OFF.
  • Measure resistance between ground and DSC HU/CM terminal A.
  • Is resistance within 0-1 ohm  ?
 Yes Go to next step.
No If there is no continuity:
  • Repair or replace harness for open circuit between DSC HU/CM and ground, then go to next step.

If resistance is not within 0-1 ohm: 
  • Repair or replace harness for poor ground then go to next step.
6 VERIFY TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear DTC from memory.

    (See CLEARING DTCS PROCEDURES ).

  • Is same DTC present?
 Yes Replace DSC HU/CM, then go to next step.
No Go to next step.
7 VERIFY THAT NO OTHER DTCS ARE PRESENT 
  • Are any other DTCs output?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No DTC troubleshooting completed.
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