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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Connectivity Master Unit >> DTC U3003:16 [Connectivity Master Unit] >> Diagnostic Procedure

Diagnostic Procedure

DTC U3003:16 DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY PCM DTCs Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .)
No Go to the next step.
2 INSPECT BATTERY Yes Go to the next step.
No Recharge or replace the battery, then go to Step 6.
(See BATTERY RECHARGING .) (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
3 INSPECT GENERATOR Yes Go to the next step.
No Replace the generator, then go to Step 6.
(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
4 INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the negative battery terminal.
  • (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Disconnect the connectivity master unit (CMU) connector.
  • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
  • Is the connector normal?
 Yes Go to the next step.
No Repair or replace the connector, then go to Step 6.
5 VERIFY CONNECTIVITY MASTER UNIT (CMU) ACC POWER SUPPLY VOLTAGE
  • Verify that the connectivity master unit (CMU) connector is disconnected.
  • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Measure the voltage at connectivity master unit (CMU) terminal 2Q (wiring harness-side).
  • Is the voltage B+?
 Yes Go to the next step.
No Inspect the MIRROR 7.5 A fuse.
  • If the fuse is blown:
    • Refer to the wiring diagram and verify if there is a common connector between MIRROR 7.5 A fuse and connectivity master unit (CMU) terminal 2Q.

      If there is a common connector:

  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
    • Repair or replace the malfunctioning location.

    If there is no common connector:

  • Repair or replace the wiring harness which is shorted to ground.
    • Replace the fuse.
    • If the fuse is damaged:
      • Replace the fuse.
  • If the fuse is normal:
    • Refer to the wiring diagram and verify if there is a common connector between ACC relay and connectivity master unit (CMU) terminal 2Q.

    If there is a common connector:

  • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
    • Repair or replace the malfunctioning location. If there is no common connector:
    • Repair or replace the wiring harness which has an open circuit.

Go to the next step.
6 VERIFY THAT REPAIRS HAVE BEEN COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
7 VERIFY IF OTHER DTCs DISPLAYED
  • Are any other DTCs displayed?
 Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [CONNECTIVITY MASTER UNIT] .)
No DTC troubleshooting completed.
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