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Code 23: Camshaft Position Sensor

NOTE: For component terminal identification, see TERMINAL IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS article in this section.
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. Manufacturer does not provide procedures for testing component using a scan tester.
  1. Install Test Harness (MB991348 ) between sensor and connector. On all models, using engine analyzer with oscilloscope capability, connect special patterns probe to specified connector terminal. See CMP PATTERN PICKUP TERMINAL ID  table.
    CMP PATTERN PICKUP TERMINAL ID

    Application Terminal No.
    Eclipse 2.0L 1
    All Other Models 4
  2. Start engine. Compare oscilloscope wave pattern with known-good wave pattern. See Fig 1 . Verify that wave length (time) decreases as engine RPM increases. If a wave pattern is output and it fluctuates to left or right, check for loose timing belt or an abnormality in sensor pickup disc. If a rectangular wave pattern is output 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: Known-Good CMP Sensor Wave Pattern ID
    G93C80277Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
  3. On all models, disconnect CKP/CMP sensor connector. Turn ignition switch to ON position. Using DVOM, check voltage between chassis ground and specified CKP/CMP sensor connector terminal. See CMP SENSOR VOLTAGE TERMINAL ID  table. If battery voltage does not exist, repair ignition circuit between CKP/CMP sensor connector and Ignition switch. If battery voltage exists, go to next step.
    CMP SENSOR VOLTAGE TERMINAL ID

    Application Terminal No.
    Eclipse 1.8L, Galant 2
    All Other Models 3
  4. With CKP/CMP sensor connector disconnected, check for continuity between chassis ground and specified CKP/CMP sensor connector terminal. See CMP SENSOR GROUND CIRCUIT TERMINAL ID  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    CMP SENSOR GROUND CIRCUIT TERMINAL ID

    Application Terminal No.
    Eclipse 2.0L 4
    All Other Models 1
  5. On Eclipse, go to next step. On Galant, with CKP/CMP sensor connector and ECM connector disconnected, check for continuity between specified CKP/CMP sensor connector terminal and ECM connector terminal. See CMP TO ECM CONNECTOR TERMINAL ID  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
    CMP TO ECM CONNECTOR TERMINAL ID

    Application CMP Terminal No. ECM Terminal No.
    All Models 4 68
  6. With ignition switch in ON position, check for voltage between chassis ground and specified CKP/CMP sensor connector terminal. See CMP SENSOR SUPPLY CIRCUIT ID  table. If 4.8-5.2 volts do not exist, replace ECM. If voltage is as specified, condition required to set fault is not present at this time. Test is complete. Intermittent problem may exist. See TESTS W/O CODES article in this section.
    CMP SENSOR SUPPLY CIRCUIT ID

    Application Terminal No.
    All Models 4
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