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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (On-Board Diagnostic (Engine Control System (L3)) >> DTC P0122 >> Diagnostic procedure

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 P0122 [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 CLASSIFY TP SENSOR OR HARNESS MALFUNCTION 
  • Connect WDS or equivalent.
  • Access TP1 PID.
  • Disconnect throttle body connector.
  • Connect a jumper wire between throttle body terminals A and B (harness-side).
  • Is voltage above 4.9 V  ?
 Yes Go to the next step.
No Go to step 5.
4 INSPECT TP SENSOR 
 Yes Inspect for poor throttle body connector terminal B connection. Repair or replace if necessary, then go to Step 8.
No Replace throttle body, then go to Step 8.
5 INSPECT POWER SUPPLY CIRCUIT VOLTAGE AT THROTTLE BODY CONNECTOR 
NOTE:
  • Turn ignition switch to ON (Engine off).
  • Measure voltage at throttle body terminal B (harness-side).
  • Is voltage within 4.5-5.5 V  ?
 Yes Go to the next step.
No Repair or replace open circuit between throttle body connector terminal B (harness-side) and PCM connector terminal 35(1), 3N(2) (harness-side). Then, then go to Step 8.
6 VERIFY TP1 SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Turn the ignition switch off.
  • Inspect continuity between throttle body terminal A (harness-side) and PCM terminal 40(1), 3M(2) (harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace suspected harness, then go to Step 8.
7 VERIFY TP1 SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Inspect continuity between throttle body terminal A (harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace suspected harness, then go to the next step.
No Go to the next step.
8 VERIFY TROUBLESHOOTING OF DTC P0122 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.
9 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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