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Home >> Mitsubishi >> 1997 >> Montero LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P0340: Camshaft Position (CMP) Sensor Circuit Failure >> Test Procedures
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Test Procedures

NOTE: Procedures are provided by manufacturer for component testing using an engine analyzer with oscilloscope capability. Refer to manufacturer's operation manual for instructions in use of oscilloscope. If using scan tool, go to step  3 .
  1. Disconnect CMP sensor connector. Install Test Harness (MB991348 ) between CMP sensor and connector. Using engine analyzer with oscilloscope capability, connect special patterns probe to CMP sensor connector terminal No. 2. Go to next step.
  2. Start engine. Compare oscilloscope wave pattern with known-good wave pattern. See Figure . Verify wavelength (time) decreases as engine RPM increases. If wave pattern fluctuates to left or right, check for loose timing belt or an abnormality in sensor pick-up disc. If a rectangular wave pattern is generated even when engine is not started, substitute known-good CMP sensor. Repeat test. If wave pattern is still abnormal, go to next step.
    Fig 1: Identifying Known-Good CMP Sensor Wave Pattern
    G93C80277Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
  3. Disconnect CMP sensor connector. Turn ignition switch to ON position. Check voltage between chassis ground and CMP sensor connector terminal No. 3. If battery voltage does not exist, repair wiring harness as necessary. If battery voltage exists, go to step 5).
  4. Disconnect CMP sensor connector and MFI relay connector. Using DVOM, check for continuity between CMP sensor connector terminal No. 3 and MFI relay connector terminal No. 1. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  5. Check for continuity between chassis ground and CMP sensor connector terminal No. 1 . If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  6. Check for continuity between ECM connector terminal No. 88 and CMP sensor connector terminal No. 2. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  7. Turn ignition switch to OFF position. With CMP sensor connector disconnected, disconnect ECM connector. Check for continuity between ECM connector terminal No. 88 and CMP sensor connector terminal No. 2. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
  8. Test is complete. Intermittent problem may exist. Road test vehicle (if necessary) and attempt to duplicate conditions that caused original complaint. Recheck for DTCs. If no DTCs are displayed, go to INTERMITTENT DTCS  .
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