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Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0122 [BP, BP WITH TC] 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 CHECK TP SENSOR CIRCUIT FOR OPEN CIRCUIT 
  • Turn the ignition switch off.
  • Check continuity between TP sensor terminals A and C (part-side).
  • Is there continuity?
 Yes Check for poor TP sensor connector terminal C connection. Repair or replace if necessary, then go to the next step.
No Replace TP sensor, then go to Step 7.
4 CHECK POWER SUPPLY CIRCUIT VOLTAGE AT TP SENSOR CONNECTOR 
NOTE:
  • If DTC P0107 and P0452 are also retrieved with P0122, go to REFERENCE VOLTAGE troubleshooting procedure.

    (See NO.30 REFERENCE VOLTAGE )

  • Turn ignition key to ON (Engine off).
  • Check voltage at TP sensor terminal A (harness-side).
  • Is voltage within 4.5-5.5 V  ?
 Yes Go to the next step.
No Repair or replace harness for open circuit, then go to Step 7.
5 VERIFY TP SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Turn the ignition switch off.
  • Disconnect PCM connector.
  • Check continuity between TP sensor terminal C (harness-side) and PCM terminal 4V (harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace suspected harness, then go to Step 7.
6 VERIFY TP SIGNAL CIRCUIT FOR SHORT TO GND 
  • Check continuity between PCM terminal 4V (harness-side) and body GND.
  • Is there continuity?
 Yes Repair or replace suspected harness, then go to the next step.
No Repair or replace short circuit between TP signal circuit and TP GND circuit, then go to the next step.
7 VERIFY TROUBLESHOOTING OF DTC P0122 COMPLETED 
  • Make sure to connect all disconnected connectors.
  • Start engine.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Depress and release accelerator pedal several times.
  • Is same DTC present?
 Yes Replace PCM, then go to the next step.
No Go to the next step.
8 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection.
(See DTC TABLE )
No Troubleshooting completed.
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