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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> On-Board Diagnostic [HVAC System - Full-Auto Air Conditioner System] >> DTC U3003:16, U3003:17 [Full-Auto Air Conditioner] >> Diagnostic Procedure

Diagnostic Procedure

STEP INSPECTION ACTION
1 INSPECT PCM DTC (INSPECT GENERATOR CIRCUIT) 
  • Switch the ignition to off.
  • Connect the M-MDS to the DLC-2.
  • Perform the PCM DTC inspection using the M-MDS.

    (See ON-BOARD DIAGNOSTIC TEST [MZR 2.5] .)

  • Are any DTCs present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [MZR 2.5] )
No Go to the next step.
2 INSPECT FUSE 
  • Switch the ignition to off.
  • Disconnect the negative battery cable.
  • Remove the ROOM 15 A fuse.
  • Is the fuse normal?
 Yes Install the ROOM 15 A fuse, then go to the next step.
No Replace the ROOM 15 A fuse, then go to Step 6.
3 INSPECT BATTERY  Yes Go to the next step.
No Replace/charge the battery, then go to the next step.
4 INSPECT CLIMATE CONTROL UNIT TERMINAL VOLTAGE 
  • Switch the ignition to ON.
  • Measure the voltage of climate control unit connector terminals 1I (IG2) and 1G (B+) of climate control unit harness side connector.
  • Is the voltage normal?
 Yes The system is normal at present.
Go to the Step 8.
No Go to the next step.
5 VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION 
  • Inspect the connector and terminals (corrosion, damage, pin disconnection).
  • Are the connector and terminals normal?
 Yes Go to the next step.
No Repair/replace the malfunctioning vehicle wiring harness, connector, or terminal.
After repair procedure, go to the next step.
6 INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR SHORT CIRCUIT TO GROUND 
  • Disconnect the climate control unit connector.
  • Inspect for continuity between climate control unit terminal 1G and body ground.
  • Is there continuity?
 Yes Repair the wiring harness, then go to Step 8.
No Go to the next step.
7 INSPECT CLIMATE CONTROL UNIT POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT 
  • Inspect for continuity between climate control unit terminal 1G and battery positive terminal.
  • Is there continuity?
 Yes Go to the next step.
No Repair the wiring harness, then go to the next step.
8 INSPECT CLIMATE CONTROL UNIT  Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
9 VERIFY THAT NO OTHER DTCs ARE PRESENT 
  • Verify other DTCs displayed.
  • Are any other DTCs output?
 Yes Perform the corresponding DTC inspection.
No DTC troubleshooting completed.
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