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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If PCM Quick Test was performed and engine starts, go to next step. If engine does not start, DTC P0340 is not the cause. Refer to NO START  testing under SYSTEM TESTS.
  2. Clear & Attempt To Re-Generate DTC P0340 -  Clear DTCs using PCM Reset Procedure. See CLEARING CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Increase engine speed to more than 1500 RPM for 10 seconds. Repeat 2 times. Turn ignition off. Retrieve Continuous Memory DTCs. If DTC P0340 is present, go to next step. If DTC P0340 is not present, problem is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS.
  3. Check For Open CMP Circuit Between PCM & CMP Sensor -  Disconnect PCM 104-pin harness connector and CMP sensor 2-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of CMP circuit between breakout box terminal No. 85 and CMP sensor harness connector terminal (Dark Blue/Orange wire). Measure resistance of SIG RTN circuit between breakout box terminal No. 23 (2.0L) or terminal No. 3 (3.0L) and CMP sensor harness connector terminal (Brown/Light Green wire). If resistance readings are less than 5 ohms, go to next step. If resistance readings are not as specified, repair open circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  8.
  4. Check CMP For Short To Power -  Reconnect CMP sensor harness connector. Turn ignition on, engine off. Measure voltage between breakout box terminal No. 85 (CMP) and terminals No. 51 and 103 (PWR GND). Turn ignition off. If voltage reading is less than one volt, go to next step. If voltage reading was more than one volt, repair short circuit to power in Dark Blue/Orange wire between PCM 104-pin harness connector terminal No. 85 and CMP sensor harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  8.
  5. Check CMP For Short To GND -  Disconnect CMP sensor harness connector. Measure resistance between breakout box terminal No. 85 (CMP) and terminal No. 23 (2.0L) or terminal No. 3 (3.0L) (SIG RTN). If resistance reading is more than 10,000 ohms, go to next step. If resistance reading is less than 10,000 ohms, repair short circuit in Dark Blue/Orange wire between PCM 104-pin harness connector and CMP sensor harness connector. After repair, go to step  8.
  6. Check For Shorts In PCM -  Connect PCM to breakout box 104-pin harness connector. Disconnect CMP sensor harness connector. Measure resistance between CMP (Dark Blue/Orange wire) and SIG RTN (Brown/Light Green wire) terminals at CMP sensor harness connector. If resistance reading is more than 500 ohms, go to next step. If resistance reading is 500 ohms or less, replace PCM. After repair, go to step  8.
  7. Check CMP Sensor Output -  Reconnect CMP sensor harness connector. Set multimeter to AC scale (to monitor less than 5 volts). Measure voltage between breakout box terminals No. 85 (CMP) and No. 103 (PWR GND) while running engine at varying RPM. If AC voltage reading varies more than 0.1 volt, replace PCM. After repair, go to next step. If AC voltage reading does not vary more than 0.1 volt, replace CMP sensor. After repair, go to next step.
  8. Verify Trouble Shooting Of DTCs Completed -  Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, trouble shooting is complete.
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