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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 P0123 [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 THROTTLE BODY CONNECTOR 
  • Turn the ignition switch off.
  • Verify that the throttle body connector is connected securely.
  • Is connector normal?
 Yes Go to the next step.
No Connect the connector securely, then go to Step 10.
4 INSPECT THROTTLE BODY CONNECTION FOR POOR CONNECTION 
  • Disconnect throttle body 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 10.
No Go to the next step.
5 INSPECT TP SENSOR 
 Yes Go to the next step.
No Replace throttle body, then go to Step 10.
6 INSPECT TP1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Turn ignition switch to ON (Engine off).
  • Measure voltage between throttle body terminal A (harness-side) and body ground.
  • Is voltage above 4.9 V? 
 Yes Repair or replace short to power supply. Then, go to Step 10.
No Go to the next step.
7 VERIFY TP SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Inspect continuity between throttle body connector terminal B (harness-side) and PCM connector terminal 35(1), 3N(2).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace open circuit between TP sensor connector terminal B (harness-side) and PCM connector terminal 35(1), 3N(2) (harness-side). Then, go to Step 10.
8 INSPECT PCM CONNECTOR FOR POOR CONNECTION 
  • Disconnect PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair terminal, then go to Step 10.
No Go to Step 10.
9 VERIFY TP SIGNAL CIRCUIT FOR SHORT TO CONSTANT VOLTAGE CIRCUIT 
  • Inspect continuity between throttle body terminals A and B (harness-side).
  • Is there continuity?
 Yes Repair or replace suspected harness, then go to the next step.
No Go to the next step.
10 VERIFY TROUBLESHOOTING OF DTC P0123 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.
11 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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