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Home >> Mazda >> 2017 >> CX-9 Touring, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> On-Board Diagnostic - Dynamic Stability Control (DSC) >> DTC U3003-16; U3003-17; U3003-1E; Power Supply Malfunction >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY PCM DTC Yes Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.5T)] .)
DTC troubleshooting completed, then go to the next step.
No Go to the next step.
2 INSPECT BATTERY Yes Charge or replace the battery, then go to Step 7.
(See BATTERY RECHARGING .) (See BATTERY REMOVAL/INSTALLATION .)
No Go to the next step.
3 INSPECT GENERATOR Yes Replace the generator, then go to Step 7.
(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
(See GENERATOR DISASSEMBLY/ASSEMBLY [SKYACTIV-G 2.5T] .)
No Go to the next step.
4 INSPECT FUSE CONDITION
  • Is the fuse (SRS1 7.5A, ABS/DSCS 30A, ABS/DSCM 50A) normal?
 Yes Go to the next step.
No
  • If the fuse is blown:
    • Refer to the wiring diagram and verify whether or not there is a common connector between fuse and DSC HU/CM terminal I, A and B.

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
    • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has a short to ground.
  • Replace the fuse.
  • If the fuse is damaged:
  • Replace the fuse.
Go to Step 7.
5 INSPECT DSC HU/CM POWER CIRCUIT FOR OPEN CIRCUIT
  • Switch the ignition OFF.
  • Disconnect the DSC HU/CM connector.
  • Switch the ignition ON (engine off).
  • Measure the voltage as followings:
    • DSC HU/CM terminal I (wiring harness-side)-body ground
    • DSC HU/CM terminal A (wiring harness-side)-body ground
    • DSC HU/CM terminal B (wiring harness-side)-body ground
  • Is the voltage 10 V or more?
 Yes Go to the next Step.
No Refer to the wiring diagram and verify whether or not there is a common connector in the followings.
  • Battery-DSC HU/CM terminal I
  • Battery-DSC HU/CM terminal A
  • Battery-DSC HU/CM terminal B

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to Step 7.
6 INSPECT DSC HU/CM GROUND CIRCUIT FOR OPEN CIRCUIT OR POOR GROUND
  • Switch the ignition OFF.
  • Disconnect the DSC HU/CM connector.
  • Measure the resistance between DSC HU/CM terminal AK (wiring harness-side) and body ground.
  • Is the resistance 0-1 ohm?
 Yes Go to the next step.
No
  • If the open circuit could be detected in the wiring harness:
    • Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AK and body ground.

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
    • Repair or replace the malfunctioning part.

    If there is no common connector:

    • Repair or replace the wiring harness which has an open circuit.
    • Go to the next step.
  • If the resistance is out of specification:
    • Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AK and body ground.

      If there is a common connector:

    • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit and a poor ground.
    • Repair or replace the malfunctioning part.

    If there is no common connector:

    • Repair or replace the wiring harness which has an open circuit and a poor ground.
    • Go to the next step.
7 VERIFY DTC TROUBLESHOOTING COMPLETED Yes Repeat the inspection from Step1 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.
8 VERIFY NO DTC IS PRESENT
  • Are any DTCs present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [DSC HU/CM] .)
No DTC troubleshooting completed.
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