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MAZDA6 (2.3L)

  1. Turn ignition switch to ON position, engine off.
  2. Using DVOM, back probe PCM 30-pin harness connector terminal No. 2A and 27-pin harness connector terminal No. 3D. See Fig 1. Ensure voltage readings change smoothly while throttle valve is gradually opened. If voltage readings change smoothly, go to next step. If voltage readings do not change smoothly, go to step  4.
  3. Check PCM 30-pin harness connector terminal No. 2A and 27-pin harness connector terminal No. 3D voltage readings. See ACCELERATOR PEDAL POSITION SENSOR VOLTAGE SPECIFICATIONS  table. If voltage readings are as specified, replace throttle body. If voltage readings are not as specified, go to next step.
    ACCELERATOR PEDAL POSITION SENSOR VOLTAGE SPECIFICATIONS

    Accelerator Pedal Position PCM Terminal No. 3D (Volts) PCM Terminal No. 2A (Volts)
    Released 1.55-1.62 1.01-1.07
    Depressed 3.49-4.09 2.94-3.54
  4. Backprobe APP sensor 6-pin harness connector. See Fig 2. Check for short or open circuit. Using DVOM, check continuity between following terminals:

    Open Circuit

    • APP sensor 6-pin harness connector terminal "A" and PCM 30-pin harness connector terminal No. 2K (Red/Black wire) through common connector.
    • APP sensor 6-pin harness connector terminal "B" and PCM 30-pin harness connector terminal No. 2H (Brown wire) through common connector.
    • APP sensor 6-pin harness connector terminal "C" and PCM 30-pin harness connector terminal No. 2A (Blue/Yellow wire) through common connector.
    • APP sensor 6-pin harness connector terminal "D" and PCM 27-pin harness connector terminal No. 3G (Gray wire).
    • APP sensor 6-pin harness connector terminal "E" and PCM 27-pin harness connector terminal No. 3A (Red/Green wire) through common connector.
    • APP sensor 6-pin harness connector terminal "F" and PCM 27-pin harness connector terminal No. 3D (White wire) through common connector.

    If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

    Short Circuit

    • APP sensor 6-pin harness connector terminal "A" and power supply (Red/Black wire).
    • APP sensor 6-pin harness connector terminal "A" and body ground (Red/Black wire).
    • APP sensor 6-pin harness connector terminal "B" and power supply (Brown wire).
    • APP sensor 6-pin harness connector terminal "C" and power supply (Blue/Yellow wire).
    • APP sensor 6-pin harness connector terminal "C" and body ground (Blue/Yellow wire).
    • APP sensor 6-pin harness connector terminal "D" and power supply (Gray wire).
    • APP sensor 6-pin harness connector terminal "D" and body ground (Gray wire).
    • APP sensor 6-pin harness connector terminal "E" and power supply (Red/Green wire).
    • APP sensor 6-pin harness connector terminal "F" and power supply (White wire).
    • APP sensor 6-pin harness connector terminal "F" and body ground (White wire).

    If continuity is present, repair short circuit in suspect wire or replace wire harness. If open or short circuits are not present, accelerator pedal. See ACCELERATOR PEDAL POSITION SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL OVERHAUL & INSTALLATION article.

Fig 1: Identifying PCM Harness Connectors & Terminals - Mazda6 (2.3L)
G00193599Courtesy of MAZDA MOTORS CORP.
Fig 2: Identifying APP Sensor 6-Pin Harness Connector Terminals
G00193596Courtesy of MAZDA MOTORS CORP.
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