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Home >> Mazda >> 2017 >> CX-3 Touring, AWD >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> On-Board Diagnostic - Dynamic Stability Control (DSC) >> DTC C0020-01; C0020-13; C0020-16; C0020-49; C0020-71; C0020-98; Pump Motor Malfunction >> Diagnostic Procedure

Diagnostic Procedure

DTC C0020-01; C0020-13; C0020-16; C0020-49; C0020-71; C0020-98; PUMP MOTOR MALFUNCTION DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT FUSE CONDITION
  • Is the fuse (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 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 5.
2 VERIFY PUMP MOTOR OPERATION Yes Go to Step 5.
No Go to the next step.
3 INSPECT PUMP MOTOR POWER SUPPLY CIRCUIT FOR OPEN OR SHORT TO GROUND CIRCUIT
  • Switch the ignition OFF.
  • Disconnect the DSC HU/CM connector.
  • Switch the ignition ON (engine off).
  • Measure the voltage between DSC HU/CM terminal B (wiring harness-side) and 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 between battery and 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 or short circuit.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has an open or short circuit.

Go to Step 5.
4 INSPECT PUMP MOTOR 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 AL (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 AL 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 AL 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 a poor ground.
    • Repair or replace the malfunctioning part. If there is no common connector:
    • Repair or replace the wiring harness which has a poor ground.
      • Go to the next step.
5 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.
6 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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