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Diagnostic procedure

DTC P0446 [AJ] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED 
  • Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (EVAP related) been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnostic according to the available repair information.
  • If the vehicle is not repaired, then go to the next step.
No Go to the next step.
3 INSPECT EVAP SYSTEM LEAK DETECTION PUMP CONTROL CIRCUIT FOR SHORT TO POWER 
  • Turn ignition switch to ON (Engine off).
  • Disconnect EVAP system leak detection pump connector.
  • Measure voltage between EVAP system leak detection pump terminal C and body ground.
  • Is voltage B+  ?
 Yes Repair or replace harness for short to power, then go to Step 5.
No Go to the next step.
4 INSPECT CHANGE OVER VALVE (IN EVAP SYSTEM LEAK DETECTION PUMP) 
 Yes Replace EVAP system leak detection pump, then go to the next step.
(See EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM COMPONENT REMOVAL/INSTALLATION ).
No Go to the next step.
5 VERIFY TROUBLESHOOTING OF DTC P0446 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear DTC from PCM memory using M-MDS.
  • Perform the KOER SELF TEST using the M-MDS.

    (See KOEO/KOER SELF TEST ).

  • Is the PENDING CODE same DTC present?
 Yes Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION ).
No Go to the next step.
6 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE .
No Troubleshooting completed.
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