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Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Tests W/Codes - Turbo - MOTRONIC 4.3) >> Circuit Tests >> DTC 5-3-5 - Turbocharger Control Valve Signal

DTC 5-3-5 - Turbocharger Control Valve Signal

WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check status message on Volvo Scan Tool (998-8686 ). To obtain correct status message, it may be necessary to floor, then release accelerator quickly several 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 DTC. Start engine. Floor accelerator a couple of times. If fault remains, DTC will return within one minute. If DTC returns, retest using new TC control valve. If DTC does not return, DTC 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.
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