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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 P0108 [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 CONNECTION OF MAP SENSOR CONNECTOR 
  • Turn the ignition switch off.
  • Verify that the MAP sensor connector is connected securely.
  • Is connection normal?
 Yes Go to the next step.
No Reconnect the connector, then go to Step 9.
4 INSPECT MAP SENSOR CONNECTOR FOR POOR CONNECTION 
  • Disconnect the MAP sensor connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace suspected terminal, then go to Step 9.
No Go to the next step.
5 VERIFY MAP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Inspect continuity between MAP sensor terminal A (harness-side) and body ground.
  • Is there continuity?
 Yes Go to the next step.
No Inspect for open circuit between PCM terminal 20(1), 2H(2) (harness-side) and MAP sensor terminal A (harness-side). Repair or replace suspected harness, then go to Step 9.
6 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Disconnect PCM connector.
  • Inspect for poor connection at terminal 20(1), 2H(2) (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.
7 VERIFY MAP SENSOR SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT 
  • Inspect for continuity between MAP sensor terminal D and C (harness-side).
  • Is there continuity?
 Yes Repair or replace suspected harness, then go to Step 9.
No Go to the next step.
8 VERIFY MAP SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Inspect continuity between MAP sensor terminal D (harness-side) and PCM terminal 14(1), 1J(2) (harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace suspected harness, then go to the next step.
9 VERIFY TROUBLESHOOTING OF DTC P0108 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 applicable 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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