Diagnostic Procedure
- If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
- Verify Related Repair Information Availability - Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
- Classify TP Sensor Or Harness Malfunction - Connect WDS or equivalent to DLC-2. Access TP1 PID. Disconnect throttle body 6-pin harness connector. Connect a jumper wire between throttle body 6-pin harness connector terminals "A" (Brown wire) and "B" (White wire). See Fig 1. If voltage reading is more than 4.9 volts, go to next step. If voltage reading is not more than 4.9 volts, go to step 5.
- Inspect TP Sensor - Turn ignition off and remove fused jumper wire. Check TP sensor operation. See THROTTLE POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If TP sensor is okay, check for poor connection at throttle body 6-pin harness connector terminal "B". Repair or replace as necessary. After repair, go to step 8. If TP sensor is faulty, replace throttle body. After repair, go to step 8.
- Inspect Power Supply Circuit Voltage At Throttle Body Connector - Turn ignition off and remove fused jumper wire. Turn ignition on, engine off. Measure voltage between ground and throttle body 6-pin harness connector terminal "B" (White wire). See Fig 1. If 4.5-5.5 volts are present, go to next step. If 4.5-5.5 volts are not present, repair or replace open circuit between throttle body 6-pin harness connector terminal "B" (White wire) and PCM 27-pin harness connector terminal "3N" (Violet/Red wire). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step 8.
- Verify TP1 Signal Circuit For Open Circuit - Turn ignition off. Check for continuity between throttle body 6-pin harness connector terminal "A" (Brown wire) and PCM 27-pin harness connector terminal "3M" (Brown/Yellow wire). If continuity is present, go to next step. If continuity is not present, repair open circuit or replace harness between throttle body 6-pin harness connector terminal "A" (Brown wire) and PCM 27-pin harness connector terminal "3M" (Brown/Yellow wire). After repair, go to step 8.
- Verify TP1 Signal Circuit For Short To Ground - Check continuity between throttle body 6-pin harness connector terminal "A" and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground between 6-pin harness connector terminal "A" (Brown wire) and PCM 27-pin harness connector terminal "3M" (Brown/Yellow wire). After repair, go to next step.
- Verify Trouble Shooting Of DTC P0122 Is Completed - Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm it up completely. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
- Verify After Repair Procedure - Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
NOTE:
If DTCs P0107 and P2228 are also retrieved with P0122, go to CONSTANT VOLTAGE troubleshooting procedure under SYSTEM TESTS.
NOTE:
All wires in harness between throttle body 6-pin harness connector and PCM 27-pin harness connector, change color at 16-pin in-line harness connector "X-09".