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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0661 [L3] DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online 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 INSPECT VARIABLE INTAKE AIR SOLENOID VALVE CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect variable intake air solenoid valve connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 9.
No Go to the next step.
4 INSPECT VARIABLE INTAKE AIR SOLENOID VALVE MALFUNCTION 
 Yes Go to the next step.
No Replace variable intake air solenoid valve, then go to step 9.
5 INSPECT VARIABLE INTAKE AIR SOLENOID VALVE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT 
  • Turn ignition switch to ON (Engine off).
  • Measure voltage between variable intake air solenoid valve terminal A (harness-side) and body ground.
  • Is voltage B+  ?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to Step 9.
6 INSPECT VARIABLE INTAKE AIR SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND 
  • Inspect continuity between variable intake air solenoid valve terminal B (harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace harness for short to ground, then go to Step 9.
No Go to the next step.
7 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Disconnect PCM connector.
  • Inspect for poor connection at terminal 4R. (such as damaged, pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair terminal, then go to Step 9.
No Go to the next step.
8 INSPECT VARIABLE INTAKE AIR SOLENOID VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT 
  • Inspect for continuity between variable intake air solenoid valve terminal A (harness-side) and PCM terminal 48(1), 4R(2) (harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to the next step.
9 VERIFY TROUBLESHOOTING OF DTC P0661 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Turn ignition switch to ON (Engine off).
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Turn the ignition switch off.
  • Start engine and run engine speed above 4,400 rpm  few times.
  • Retrieve any DTC.
  • Is PENDING CODE for this DTC present?
 Yes Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
No Go to the next step.
10 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection. (See DTC TABLE .)
No Troubleshooting completed.
(1) California emission regulation applicable ATX model
(2) Except for California emission regulation applicable ATX model
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