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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (On-Board Diagnostic - Dynamic Stability Control (DSC)) >> DTC C0020-11; C0020-12; C0020-13; C0020-71; Pump Motor, Motor Relay >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT FUSE CONDITION
  • Is the fuse (MAIN 200A, ABS/DSCM50A) normal?
 Yes Go to the next step.
No Replace the fuse, then go to Step 6.
2 VERIFY PUMP MOTOR OPERATION
  • Switch the ignition to off.
  • Connect the M-MDS to the DLC-2.
  • Switch the ignition ON (engine off).
  • Access PMP_MT_SP active command modes using the MMDS.
  • Does the pump motor operate?
 Yes Go to Step 6.
No Go to the next step.
3 INSPECT MOTOR RELAY POWER SUPPLY FOR OPEN CIRCUIT
  • Switch the ignition to off.
  • Disconnect the DSC HU/CM connector.
  • Inspect for continuity between DSC HU/CM terminal B (vehicle harness-side) and the positive battery terminal.
  • Is there continuity?
 Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal B and the positive battery terminal. 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 6.
4 INSPECT MOTOR RELAY POWER SUPPLY FOR SHORT CIRCUIT
  • Inspect for continuity between DSC HU/CM terminal B (vehicle harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace the wiring harness, then go to Step 6.
No Go to the next step.
5 INSPECT PUMP MOTOR GROUND FOR OPEN CIRCUIT
  • Inspect for continuity between DSC HU/CM terminal AL (vehicle harness-side) and body ground.
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness, then go to the next step.
6 VERIFY THAT THE SAME DTC IS NOT PRESENT 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.
7 VERIFY THAT NO OTHER DTCS ARE PRESENT
  • Are any other DTCs output?
 Yes Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .)
No DTC troubleshooting completed.
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