LEMON Manuals: Even more car manuals for everyone
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 5-3-5: Turbocharger Control Valve Signal

Code 5-3-5: Turbocharger Control Valve Signal

  1. Check status message on Volvo Scan Tool (998-8686 ). To obtain correct status message, it may be necessary to floor accelerator quickly a couple of times. If fault is PERMANENT, SIGNAL TOO HIGH, go to step 2). If fault is PERMANENT, SIGNAL TOO LOW, go to step 3). If fault is INTERMITTENT, SIGNAL TOO HIGH, go to step 7). If fault is INTERMITTENT, SIGNAL TOO LOW, go to step 8).
  2. Turn ignition off. Disconnect Turbocharger (TC) control valve. Turn ignition on. Connect voltmeter between TC control valve connector terminal No. 2 and ground. If voltmeter reads less than one volt, retest using new TC control valve. If voltmeter does not read less than one volt, check wiring between TC control valve connector terminal No. 2 and ECM terminal B41 for a short circuit to voltage.
  3. Turn ignition off. Disconnect TC control valve. Turn ignition on. Connect voltmeter between TC control valve connector terminal No. 1 and ground. If voltmeter reads battery voltage, go to next step. If voltmeter does not read battery voltage, check wiring between main relay connector terminal No. 3 and TC control valve connector terminal No. 1 for an open circuit.
  4. Turn ignition off. Wait about 2 minutes. Disconnect TC control valve. Connect ohmmeter between TC control valve connector terminal No. 2 and ground. If ohmmeter reads 27-37 k/ohms, go to step 6). If ohmmeter reads about zero volts, check wiring between TC control valve connector terminal No. 2 and ECM terminal B41 for a short circuit to ground. If ohmmeter reads infinite resistance, go to next step.
  5. Turn ignition off. Disconnect TC control valve. Disconnect ECM connector. Ensure ECM connector terminals are clean and tight. Repair as necessary. Reconnect ECM connector. Connect ohmmeter between TC control valve connector terminal No. 2 and ground. If ohmmeter reads 27-37 k/ohms, problem is poor contact at ECM connector. If ohmmeter does not read 27-37 ohms, check wiring between TC control valve connector terminal No. 2 and ECM terminal B41 for an open circuit.
  6. Turn ignition off. Reconnect TC control valve. Turn ignition on. Erase code. Start engine. Floor accelerator a couple of times. If fault remains, code will return within one minute. If code returns, retest using new TC control valve. If code does not return, code is caused by poor contact in TC control valve connector. Repair as necessary.
  7. Check TC control valve and ECM connectors for loose connection or contact resistance. Also check wiring between TC control valve connector terminal No. 2 and ECM terminal B41 for an intermittent short circuit to voltage.
  8. Check TC control valve and ECM connectors for loose connection or contact resistance. Check wiring between TC control valve connector terminal No. 2 and ECM terminal B41 for an intermittent open circuit or short circuit to ground. Also check wiring between TC control valve connector terminal No. 1 and main relay connector terminal No. 3 for an intermittent open circuit.
scientia non olet · About LEMON Manuals