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Home >> Volvo >> 1995 >> 850 Base, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Turbo >> Diagnostic Trouble Code Testing >> MOTRONIC 4.3 Control System >> Code 3-1-4: Camshaft Position Sensor Signal

Code 3-1-4: Camshaft Position Sensor Signal

  1. Check for other codes. If no other codes are present, go to next step. If Codes 1-2-3, 4-1-1, and possibly 4-1-3 are stored, check TP sensor, ECT sensor, camshaft position sensor, and EGR temperature sensor connection at ECM connector terminal A18 for signs of contact resistance and oxidation.
  2. Using Volvo Scan Tool (998-8686 ) check status message to determine whether fault is permanent or intermittent. If fault is permanent, go to next step. If fault is intermittent, go to step 12).
  3. Turn ignition off. Wait about 2 minutes. Disconnect camshaft position sensor. Connect an ohmmeter between camshaft position sensor connector terminal No. 1 and ground. If ohmmeter reads about zero ohms, go to step 5). If ohmmeter does not read about zero ohms, go to next step.
  4. Turn ignition off. Disconnect ECM connector. Disconnect camshaft position sensor connector. Ensure ECM connector terminals are clean and free of oxidation. Reconnect ECM connector. Connect an ohmmeter between camshaft position sensor terminal No. 1 and ground. If ohmmeter reads about zero ohms, source of code is poor contact in ECM connector. If ohmmeter does not read about zero ohms, check wiring between camshaft position sensor connector terminal No. 1 and ECM connector A18 for an open circuit.
  5. Turn ignition on. Disconnect camshaft position sensor connector. Connect voltmeter between camshaft position sensor connector terminal No. 3 and ground. If battery voltage is present, go to step 7). If battery voltage is not present, go to next step.
  6. Turn ignition off. Disconnect camshaft position sensor. Ensure ECM connector terminals are clean and free of oxidation. Reconnect ECM. Turn ignition on. Connect voltmeter between camshaft position sensor connector terminal No. 3 and ground. If voltmeter shows battery voltage, source of DTC is poor contact in ECM connector. If voltmeter does not show battery voltage, check wiring between CMP sensor connector terminal No. 3 and ECM terminal A36 for an open circuit.
  7. Turn ignition on. Disconnect camshaft position sensor connector. Connect voltmeter between camshaft position sensor connector terminal No. 2 and ground. If voltmeter reads about 5 volts, go to step 10). If voltmeter reads more than about 5 volts, check wiring between camshaft position sensor connector terminal No. 2 and ECM terminal A21 for a short circuit to voltage, then go to step 11). If voltmeter reads less than about 5 volts, go to next step.
  8. Turn ignition off. Wait about 2 minutes. Disconnect camshaft position sensor. Connect an ohmmeter between camshaft position sensor connector terminal No. 2 and ground. If ohmmeter reads infinite resistance, go to next step. If ohmmeter reads about zero ohms, check wiring between camshaft position sensor connector terminal No. 2 and ECM connector terminal A21 for a short circuit to ground.
  9. Turn ignition off. Disconnect camshaft position sensor. Disconnect ECM connector. Ensure ECM connector terminals are clean and free of oxidation. Reconnect ECM. Connect an ohmmeter between camshaft position sensor connector terminal No. 2 and ground. If ohmmeter reads .5-3 k/ohms, check for poor contact at ECM connector. If ohmmeter does not read .5-3 k/ohms, check wiring between camshaft position sensor connector terminal No. 2 and ECM connector terminal A21 for an open circuit.
  10. Reconnect camshaft position sensor. Attempt to start engine. If engine starts, code is caused by poor contact at camshaft position sensor connector or ECM connector. If engine starts, retest using new camshaft position sensor.
  11. Ensure camshaft position sensor is connected. If engine starts, camshaft position sensor is okay. If engine does not start, retest using new camshaft position sensor.
  12. If fault is intermittent, check camshaft position sensor and ECM connectors for loose connection, contact resistance, or oxidation. Check wiring between camshaft position sensor connector terminal No. 1 and ECM terminal A18 for an intermittent open circuit. Check wiring between camshaft position sensor connector terminal No. 2 and ECM terminal A21 for an intermittent open circuit, short circuit to ground, or short circuit to voltage. Also check wiring between camshaft position sensor connector terminal No. 3 and ECM terminal A36 for an intermittent open circuit.
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