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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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.
  2. 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.
  3. Verify Related Pending Code Or Stored DTCs -  Turn ignition off, then on (engine off). Verify pending code or stored DTCs using WDS or equivalent. If no other DTCs are present, go to next step. If any DTC is present, go to appropriate DTC trouble shooting procedure. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  4. Identify Trigger DTC For FREEZE FRAME DATA -  If only DTC P2101 is on FREEZE FRAME DATA, go to next step. If any other DTC triggered FREEZE FRAME DATA, go to appropriate trouble shooting procedure for DTC that triggered FREEZE FRAME DATA. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  5. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Inspect for poor connection (such as damaged, pulled-out terminals or corrosion). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  17.
  6. Inspect Main Relay Output Voltage -  Turn ignition off. Connect PCM 104-pin harness connector. Turn ignition on, engine off. Measure voltage between following harnesses:
    • PCM 104-pin harness connector terminal No. 71 (White/Blue wire) and body ground
    • PCM 104-pin harness connector terminal No. 97 (White/Blue wire) and body ground
    See Fig 1. If battery voltage is not present, go to next step. If battery voltage is present, go to step  11.
    Fig 1: Identifying Throttle Actuator Control Motor Relay Circuits & Harness Connector Terminals
    G00256840Courtesy of MAZDA MOTORS CORP.
  7. Inspect Main Relay Connector For Poor Connection -  Turn ignition off. Disconnect main relay. Inspect for poor connection (such as damaged, pulled-out terminals or corrosion). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  17.
  8. Inspect Main Relay Power Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between following harnesses:
    • Main relay harness connector terminal "A" (White/Green wire) and body ground
    • Main relay harness connector terminal "D" and body ground
    If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit between main relay and battery or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  17.
  9. Inspect Main Relay -  Inspect main relay. Refer to MAIN RELAY under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If no malfunction is present, go to next step. If main relay is faulty, replace main relay. After repair, go to step  17.
  10. Inspect Main Relay Circuit For Open Circuit -  Turn ignition off. Check for continuity between following harnesses:
    • Main relay harness connector terminal "C" and PCM 104-pin harness connector terminal No. 71 (White/Blue wire)
    • Main relay harness connector terminal "C" and PCM 104-pin harness connector terminal No. 97 (White/Blue wire)
    • Main relay harness connector terminal "E" and PCM 104-pin harness connector terminal No. 28 (Black/Yellow wire)
    See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in suspected wire between main relay harness connector and PCM 104-pin harness connector or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  17.
  11. Inspect ET Control Relay Output Voltage -  Turn ignition on, engine off. Measure voltage between PCM 104-pin harness connector terminal No. 92 (Pink wire) and body ground. If battery voltage is not present, go to next step. If battery voltage is present, go to step  17.
  12. Inspect ET Control Relay Connector For Poor Connection -  Turn ignition off. Disconnect ET control relay harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If no malfunction is present, go to next step. If any malfunction is present, repair or replace faulty terminal. After repair, go to step  17.
  13. Inspect ET Control Relay Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between ET control relay harness connector terminal "D" and body ground. See Fig 1. If battery voltage is present, go to next step. If is not present, repair open circuit between ET control relay and battery or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  17.
  14. Inspect ET Control Relay Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between ET control relay terminal "A" (White/Blue wire) and body ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in White/Blue wire between ET control relay harness connector terminal "A" and main relay harness connector terminal "C" or replace wire harness. After repair, go to step  17.
  15. Inspect ET Control Relay -  Inspect ET control relay. Refer to MAIN RELAY under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If no malfunction is present, go to next step. If ET control relay is faulty, replace ET control relay. After repair, go to step  17.
  16. Inspect ET Control Relay Circuit For Open Circuit -  Turn ignition off. Check for continuity between following harnesses:
    • ET control relay harness connector terminal "C" and PCM 104-pin harness connector terminal No. 92 (Pink wire)
    • ET control relay harness connector terminal "E" and PCM 104-pin harness connector terminal No. 19 (Blue wire)
    See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in suspected wire between ET control relay harness connector and PCM 104-pin harness connector or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  17. Verify Trouble Shooting Of DTC P2101 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from PCM memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and run at idle. 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.
  18. 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.
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