LEMON Manuals: Even more car manuals for everyone
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 U3003-08; U3003-16; U3003-17; Power Supply System >> 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.
DTC U3003:08/U3003:16/U3003:17 (DYNAMIC STABILITY CONTROL) - DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 INSPECT BATTERY VOLTAGE
  • Is the battery positive terminal voltage normal?
 Yes Inspect for normal connection of the battery terminals.
Go to the next step.
No Charge or replace the battery, then go to Step 7. (See BATTERY RECHARGING [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
2 INSPECT BATTERY GRAVITY
  • Is battery specific gravity as specified?
 Yes Go to the next step.
No Replace the battery, then go to Step 7.
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
3 INSPECT CHARGING SYSTEM
  • Are the generator and the drive belt tensions normal?
 Yes Go to the next step.
No Replace the generator and/or drive belt if necessary.
(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITHOUT i-ELOOP)] .)
(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5 (WITH i-ELOOP)] .)
(See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .) Go to Step 7.
4 INSPECT FUSE CONDITION:
  • Inspect the following fuses.
    • MAIN 200A
    • SRS17.5A
    • ABS/DSCS 30A
      • ABS/DSCM 50A
  • Is the fuse normal?
 Yes Go to the next step.
No Replace the fuse, then go to Step 7.
5 INSPECT DSC HU/CM POWER SUPPLY FOR OPEN CIRCUIT
  • Disconnect the DSC HU/CM connectors.
  • Switch the ignition ON (engine off).
  • Measure the voltage between following connector terminals of the DSC HU/CM (vehicle harness-side) and body ground:
    • DSC HU/CM: A-Body ground
    • DSC HU/CM: B-Body ground
    • DSC HU/CM: Q
    • 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 following connector terminals of the DSC HU/CM (vehicle harness-side) and positive battery terminal:
  • DSC HU/CM: A-Positive battery terminal
  • DSC HU/CM: B-Positive battery terminal
  • DSC HU/CM: Q-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 7.
6 INSPECT DSC HU/CM GROUND FOR POOR GROUND OR OPEN CIRCUIT
  • Switch the ignition to off.
  • Measure the resistance between the DSC HU/CM terminal AL (vehicle harness-side) and body ground.
  • Is the resistance within 0-1 ohm?
 Yes Go to the next step.
No
  • If there is open circuit:
    • Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and the 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 ne xt step.
  • If resistance is not within specification:
    • Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and the 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 poor ground.
    • Repair or replace the malfunctioning part. If there is no common connector:
    • Repair or replace the poor ground part.
      • Go to the next step.
7 VERIFY THAT THE SAME DTC IS NOT PRESENT Yes Repeat the inspection from Step 1.
No Go to the next step.
8 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.
scientia non olet · About LEMON Manuals