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Turbocharger Control Circuit

  1. Check exhaust by-pass valve Vacuum Switching Valve (VSV), exhaust gas control VSV and intake air control valve VSV. See EXHAUST GAS CONTROL VSV, EXHAUST BY-PASS VALVE (VSV), INTAKE AIR CONTROL VALVE VSV & WASTEGATE VSV under ENGINE SENSORS & SWITCHES .
  2. If all vacuum switching valves operate properly, ensure ignition is off. Raise floor mat on passenger's side for access to Engine Control Module (ECM). Turn ignition on.
  3. Using voltmeter, check voltage between terminal No. 38 (Green/Red) wire, No. 39 (Green/Yellow) wire and No. 40 (Green/Black) wire of E9 connector and chassis ground. See Figure.
  4. Voltage should be 9-14 volts with engine idling. If voltage is correct, proceed to step 6). If voltage is not within specification, check for defective EFI No. 2 relay or wiring harness between EFI No. 2 relay and ECM. See EFI NO. 2 RELAY under RELAYS . See appropriate wiring diagram in WIRING DIAGRAMS article.
  5. If EFI No. 2 relay and wiring harness are okay, check ECM ground circuit. If ECM ground circuit is okay, substitute another ECM and recheck system operation.
  6. Check exhaust gas control valve actuator, exhaust by-pass valve actuator and intake air control valve actuator. See EXHAUST GAS CONTROL VALVE ACTUATOR, EXHAUST BY-PASS VALVE ACTUATOR & VALVE and INTAKE AIR CONTROL VALVE ACTUATOR under TURBOCHARGERS .
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