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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 CMP Sensor Voltage -  Disconnect CMP sensor 2-pin harness connector. Connect voltmeter between CMP sensor connector terminals "A" and "B". See Fig 1. Inspect voltage in AC range while cranking engine. If any voltage reading is present, go to next step. If AC voltage reading is not present, go to step  9.
    Fig 1: Identifying CMP Sensor Circuits & Harness Connector Terminals
    G00221506Courtesy of MAZDA MOTORS CORP.
  4. - Inspect CMP Sensor Connector For Poor Connection  Verify CMP sensor connector is connected securely. Is connector okay, go to next step. If connector is not okay, reconnect connector securely. After repair, go to step  10.
    5. NOTE: Wire color changes at in-line connector "X-09" between CMP sensor and PCM harness connectors.
  5. Inspect CMP Circuit For Short To Power -  Turn ignition off. Disconnect CMP sensor harness connector. See Fig 1. Turn ignition on, engine off. Measure voltage between ground and following:
    • CMP sensor harness connector terminal "A" (Brown/White wire)
    • CMP sensor harness connector terminal "B" (White/Violet wire)
    If voltage reading is not present, go to next step. If any voltage reading is present, repair short circuit to power in suspected wire or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
  6. Inspect CMP Circuit For Short To Ground -  Check for continuity between following terminals and body ground:
    • CMP sensor harness connector terminal "A" (Brown/White wire)
    • CMP sensor harness connector terminal "B" (White/Violet wire)
    If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in suspected wire or replace wire harness. After repair, go to step  10.
  7. Inspect Poor Connection Of PCM Connector -  Disconnect PCM harness connectors. Check for poor connection (damaged, pulled-out terminals, corrosion, etc.). If malfunction is not present, go to next step. If there is any malfunction, repair or replace terminal. After repair, go to step  10.
    8. NOTE: Wire color changes at in-line connector "X-09" between CMP sensor and PCM harness connectors.
  8. Inspect CMP Circuit For Open Circuit -  Check for continuity between following terminals:
    • CMP sensor harness connector terminal "A" (Brown/White wire) and PCM 30-pin harness connector terminal "2M" (White wire)
    • CMP sensor harness connector terminal "B" (White/Violet wire) and PCM 30-pin harness connector terminal "2J" (Black wire)
    If continuity is present, go to step  10. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
  9. Inspect CMP Sensor -  Turn ignition off. Perform CMP sensor inspection. Refer to CAMSHAFT POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If CMP sensor is faulty, replace CMP sensor. After repair, go to next step. If CMP sensor is okay, check CMP sensor pulse wheel for damage. If CMP sensor pulse wheel is okay, go to next step. If CMP pulse wheel is damaged, replace CMP sensor pulse wheel. After repair, go to next step.
    10. NOTE: MAF PID should indicate 0.25 lb/min. (1.95 grams/sec.) or more during this test.
  10. Verify Trouble Shooting Of DTC P0335 Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from PCM memory using WDS or equivalent. Start engine. Access MAF PID using WDS or equivalent. If same DTC is not present, go to next step. If 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.
  11. 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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