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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 P0327 [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 KNOCK SENSOR CONNECTOR TERMINAL FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect knock sensor connector.
  • Check for poor connection at terminals A and B (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.
4 INSPECT KNOCK SENSOR 
 Yes Go to the next step.
No Replace knock sensor, then go to the next step.
5 INSPECT KNOCK SENSOR CIRCUITS FOR OPEN CIRCUIT 
  • Disconnect knock sensor connector.
  • Inspect continuity between the following circuits:
    • Knock sensor female terminal A (harness-side) and PCM terminal 81(1), 2S(2) (harness-side)
    • Knock sensor female terminal B (harness-side) and PCM terminal 3(1), 2P(2) (harness-side)
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace suspected wiring harness, then go to Step 9.
6 INSPECT KNOCK SENSOR CIRCUITS FOR SHORT TO GROUND 
  • Inspect continuity between following circuits:
    • Knock sensor female terminal A (harness-side) and body ground
    • Knock sensor female terminal B (harness-side) and body ground
  • Is there continuity?
 Yes Repair or replace suspected wiring harness, then go to Step 9.
No Go to the next step.
7 INSPECT FOR SHORT CIRCUITS 
  • Inspect continuity between knock sensor female terminals A and B (harness-side).
  • Is there continuity?
 Yes Repair or replace suspected harness, then go to Step 9.
No Go to the next step.
8 INSPECT PCM CONNECTOR TERMINAL FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Inspect for poor connection at terminals 3 and 81(1), 2P and 2S(2) (such as damaged, pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair terminal, then go to the next step.
No Go to the next step.
9 VERIFY TROUBLESHOOTING OF DTC P0327 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.
  • Start engine and warm it up completely.
  • Is same 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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