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Home >> Volvo >> 1995 >> 850 GLT, 4D Sedan, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Controls - Tests W/Codes - Non-Turbo (M/T) - MOTRONIC 4.4) >> Circuit Tests >> DTC 223 - IAC Valve Signal Opening Or DTC 245 - IAC Valve Signal Closing

DTC 223 - IAC Valve Signal Opening Or DTC 245 - IAC Valve Signal Closing

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. If fault is permanent and signal is too high, go to next step. If fault is permanent and signal is too low, go to step 3). If fault is intermittent and signal is too high, go to step 6). If fault is intermittent and signal is too low, go to step 7). If fault is permanent and signal is missing, go to step 9). If fault is intermittent and signal is missing, check all connectors for good terminal contact. Repair as necessary.
  2. Turn ignition off. Disconnect IAC valve. Turn ignition on. Connect voltmeter between ground and IAC valve connector terminal No. 3 (DTC 223) or terminal No. 1 (DTC 245). If voltmeter shows less than one volt, replace valve. If voltmeter show more than one volt on DTC 223, check wiring between IAC valve connector terminal No. 3 and ECM connector terminal A11 for a short circuit to voltage. On DTC 245, if voltmeter shows more than one volt, check wiring between IAC valve connector terminal No. 1 and ECM connector terminal A25 for a short circuit to voltage.
  3. If fault is permanent and signal is too low, turn ignition off. Disconnect IAC valve. Turn ignition on. Connect voltmeter between IAC valve connector terminal No. 2 and ground. If voltmeter shows battery voltage, go to next step. If voltmeter does not show battery voltage, check wiring between main relay connector terminal No. 3 and IAC valve connector terminal No. 2 for an open circuit. If there is an open circuit in voltage lead, both DTCs 223 and 245 will be set.
  4. Turn ignition off. Wait about 2 minutes. Disconnect IAC valve connector. Connect an ohmmeter between IAC valve connector terminals No. 1 and 3. If ohmmeter reads 20-40 k/ohms, go to next step. If ohmmeter reads infinite resistance, check wiring between IAC valve terminal No. 3 and ECM connector terminal A11 for a short to ground. Repair as necessary. If ohmmeter shows about zero ohms on DTC 223, check wiring between IAC valve connector terminal No. 3 and ECM connector terminal A11 for a short to wiring between IAC valve connector terminal No. 1 and ECM connector terminal A25. Repair as necessary.
  5. Turn ignition off. Disconnect IAC valve. Connect ohmmeter between IAC valve connector terminals No. 1 and 2, then between terminals No. 2 and 3. If ohmmeter reads 9-14 ohms in both cases, cause of DTC is poor contact in IAC valve connector. Repair as necessary. If ohmmeter does not read 9-14 ohms in both cases, test using new IAC valve.
  6. If fault is intermittent and signal is too high on DTC 223, check wiring between IAC valve connector terminal No. 3 and ECM connector terminal A11 for an intermittent short to voltage or intermittent short circuit to coil signal voltage. On DTC 245, check wiring between IAC valve connector terminal No. 1 and ECM connector terminal A25 for an intermittent short to voltage or intermittent short circuit to coil signal voltage.
  7. If fault is intermittent and signal is too low on DTC 245, go to next step. On DTC 223, check IAC valve and ECM connectors for contact resistance and oxidation. Repair as necessary. Check wiring between main relay connector terminal No. 3 and IAC valve connector terminal No. 2 for an intermittent open circuit. Also check wiring between IAC valve connector terminal No. 3 and ECM connector terminal A11 for an intermittent open circuit or short circuit to ground.
  8. On DTC 245, check IAC valve and ECM connectors for contact resistance and oxidation. Repair as necessary. Check wiring between main relay connector terminal No. 3 and IAC valve connector terminal No. 2 for an intermittent open circuit. Also check wiring between IAC valve connector terminal No. 1 and ECM connector terminal A25 for an intermittent open circuit or short circuit to ground.
  9. If fault is permanent and signal is missing, turn ignition off. Wait about 2 minutes. Disconnect IAC valve. Connect ohmmeter between ground and ICA valve connector terminal No. 3. If ohmmeter does not read 10-20 k/ohms, go to next step. If ohmmeter reads 10-20 k/ohms, measure resistance between IAC valve connector terminals No. 1 and 2, then between terminals No. 2 and 3. If ohmmeter reads 9-14 ohms in both cases, DTC was caused by poor terminal contact at IAC valve connector. If ohmmeter does not read 9-14 ohms, replace IAC valve.
  10. Check IAC valve connector terminals and ECM connector terminals for good terminal contact. Repair as necessary. Repeat test. If ohmmeter now reads 10-20 k/ohms, problem was poor terminal contact. If ohmmeter does not read 10-20 k/ohms, check wiring between IAC valve terminal No. 3 and ECM connector terminal A11 for an open circuit.
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