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Home >> Mazda >> 2013 >> 6 i Touring Plus >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System MZR 2.5] >> DTC P0446:00 >> Diagnostic Procedure

Diagnostic Procedure

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA HAS BEEN RECORDED 
  • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?
 Yes Go to the next step.
No Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 VERIFY RELATED PENDING AND STORED DTC 
  • Switch the ignition to off, then to ON (engine off).
  • Verify pending and stored DTCs using the M-MDS.

    (See ON-BOARD DIAGNOSTIC TEST .)

  • Are any other DTCs present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No Go to the next step.
4 INSPECT CV SOLENOID VALVE CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the CV solenoid valve connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal and/or connector, then go to Step 11.
No Go to the next step.
5 INSPECT CV SOLENOID VALVE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT 
  • CV solenoid valve connector is disconnected.
  • Measure the voltage between CV solenoid valve terminal A (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 Yes Go to the next step.
No Inspect the ENG+B 10 A fuse.
  • If the fuse is melt:
    • Repair or replace the wiring harness for a possible short to ground.
    • Replace the fuse.
  • If the fuse is deterioration:
    • Replace the fuse.
  • If the fuse is normal:
    • Repair or replace the wiring harness for a possible open circuit.

Go to Step 11.
6 INSPECT CV SOLENOID VALVE CIRCUIT FOR SHORT TO GROUND 
  • CV solenoid valve connector is disconnected.
  • Inspect for continuity between CV solenoid valve terminal B (wiring harness-side) and body ground.
  • Is there continuity?
 Yes If the short to ground circuit could be detected:
  • Repair or replace the wiring harness for a possible short to ground.

If the short to ground circuit could not be detected:

Go to Step 11.
No Go to the next step.
7 INSPECT PCM CONNECTOR CONDITION 
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal and/or connector, then go to Step 11.
No Go to the next step.
8 INSPECT CV SOLENOID VALVE CIRCUIT FOR SHORT TO POWER SUPPLY 
  • CV solenoid valve and PCM connectors are disconnected.
  • Switch the ignition to ON (engine off).
  • Measure the voltage between CV solenoid valve terminal B (wiring harness-side) and body ground.
  • Is there any voltage?
 Yes Repair or replace the wiring harness for a possible short to power supply, then go to Step 11.
No Go to the next step.
9 INSPECT CV SOLENOID VALVE 
 Yes Replace the CV solenoid valve, then go to Step 11.
(See CHARCOAL CANISTER, CANISTER VENT (CV) SOLENOID VALVE, AIR FILTER COMPONENT REMOVAL/INSTALLATION .)
No Go to the next step.
10 INSPECT CV SOLENOID VALVE CIRCUIT FOR OPEN CIRCUIT 
  • CV solenoid valve and PCM connectors are disconnected.
  • Switch the ignition to off.
  • Inspect for continuity between CV solenoid valve terminal B (wiring harness-side) and PCM terminal 1M (wiring harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to the next step.
11 VERIFY DTC TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.

    (See AFTER REPAIR PROCEDURE .)

  • Start the engine and warm it up completely.
  • Perform the Pending Trouble Code Access Procedure.

    (See ON-BOARD DIAGNOSTIC TEST .)

  • Is the PENDING CODE for this DTC present?
 Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
12 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No DTC troubleshooting completed.
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