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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 687 (ON-BOARD DIAGNOSTIC (ENGINE CONTROL SYSTEM L3) (2 OF 5))DTC P0122DIAGNOSTIC PROCEDURE
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Diagnostic Procedure

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2007 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0122 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 M-MDS or equivalent.
  • Access TP1 PID.
  • Disconnect throttle body connector.
  • Connect a jumper wire between throttle body terminals A and B (wiring 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:
  • If DTC P0107 and P2228 are also retrieved with P0122, go to troubleshooting procedure.

  • Turn ignition switch to ON (Engine off).
  • Measure voltage at throttle body terminal B (wiring 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 (wiring harness-side) and PCM connector terminal 2AO (wiring 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 (wiring harness-side) and PCM terminal 2AK (wiring 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 (wiring harness-side) and body ground.
  • Inspect continuity between throttle body terminal B (wiring 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 M-MDS 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.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.