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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> Diagnostic Tests >> DTC P0345: Left Side Camshaft Position Sensor Circuit - Malfunction >> Diagnostic Procedure

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 Left Side CMP Sensor Voltage -  Disconnect left side CMP sensor harness connector. Connect voltmeter between left side CMP sensor connector terminals. Check voltage in AC range while cranking engine. If a voltage reading is present, go to next step. If a voltage reading is not present, go to step  9.
  4. Verify Left Side CMP Sensor Resistance -  Measure right side CMP sensor resistance. Refer to CAMSHAFT POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If CMP sensor resistance reading is okay, check left side CMP sensor pulse wheel for damage. If there is any malfunction, replace left side CMP sensor pulse wheel. Refer to appropriate article in ENGINES. After repair, go to step  10. If left side CMP sensor resistance reading is zero ohm, go to next step. If left side CMP sensor resistance reading is infinity, go to step  7.
  5. Inspect Left Side CMP Sensor Circuit For Short To Ground -  Turn ignition off. Check for continuity between following circuits:
    • Left side CMP sensor harness connector terminal "A" (White/Green wire) and body ground
    • Left side CMP sensor harness connector terminal "B" (Brown/White wire) and body ground
    If no continuity is present, go to next step. If continuity is present, repair short circuit to ground in suspected wire between left side CMP sensor 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  10.
  6. Inspect Left Side CMP Sensor Circuit For Short With Each Other -  Turn ignition off. Disconnect left side CMP sensor harness connector. Check for continuity between left side CMP sensor harness connector terminal "A" (White/Green wire) and terminal "B" (Brown/White wire). See Fig 1. If no continuity is present, go to next step. If continuity is present, repair short between left side CMP sensor circuits or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
    Fig 1: Identifying Left Side CMP Sensor Circuits & Harness Connector Terminals
    G00221548Courtesy of MAZDA MOTORS CORP.
  7. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If no malfunction is found, go to next step. If any malfunction is present, repair or replace terminal or replace wire harness. After repair, go to step  10.
  8. Inspect Left Side CMP Sensor Circuit For Open Circuit -  Turn ignition off. Check for continuity between following circuits:
    • Left side CMP sensor harness connector terminal "A" (White/Green wire) and PCM 104-pin harness connector terminal No. 58 (Brown wire)
    • Left side CMP sensor harness connector terminal "B" (Brown/White wire) and PCM 104-pin harness connector terminal No. 59 (Yellow wire)
    If continuity is present, go to next step. If no continuity is present, repair open circuit in suspected wire or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
  9. Inspect Left Side CMP Sensor -  Inspect left side CMP sensor. Refer to CAMSHAFT POSITION SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If left side CMP sensor is okay, go to next step. If left side CMP sensor is faulty, replace left side CMP sensor. Refer to CAMSHAFT POSITION SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0340 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. Access MAF PID using WDS or equivalent. MAF PID should indicate 0.36 lb./min. (2.7 grams/sec.) or more during this test. 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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