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Diagnosis & Repair (Using Toyota Scan Tool)

  1. Connect Toyota scan tool to DLC No. 3. See Figure. Start and run engine. Using scan tool, select ACTIVE TEST mode. Turn on supercharger magnetic clutch relay and check operation of magnetic clutch.
  2. If clutch operates correctly, go to step 7). If clutch does not operate, check supercharger magnetic clutch relay. See SYSTEM/COMPONENT TESTS article. Replace as necessary. If relay is okay, go to next step.
  3. Disconnect magnetic clutch connector. See Fig 1. Using ohmmeter, measure resistance between magnetic clutch connector terminals. If resistance is 3.4-3.8 ohms at 68°F (20°C), go to next step. If resistance is not 3.4-3.8 ohms, replace magnetic clutch.
  4. Ensure ignition is off. Access ECM under driver's seat. Turn ignition on. Using DVOM, measure voltage between ground and terminal No. 5 (Red/Green wire) at ECM E9 connector. See Figure. If voltage is 9-14 volts, go to next step. If voltage is not 9-14 volts, go to step 6).
  5. Check for an open or short in wiring harness between EFI main relay and magnetic clutch, magnetic clutch and supercharger magnetic clutch relay and between supercharger magnetic clutch relay and ground. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary. If wiring harness is okay, replace ECM and retest.
  6. Check for an open or short in wiring harness between EFI main relay and supercharger magnetic clutch relay and between supercharger magnetic clutch relay and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary. If wiring harness is okay, check supercharger pressure. See SYSTEM/COMPONENT TESTS article.
  7. Check operation of supercharger by-pass valve. See SYSTEM/COMPONENT TESTS article. Replace valve as necessary. If valve is okay, go to next step.
  8. Check for open or short circuit in wiring harness between EFI main relay and supercharger by-pass valve and between supercharger by-pass valve and ECM. Repair wiring as necessary. If wiring harness is okay, replace ECM and retest.
Fig 1: Measuring Magnetic Clutch Resistance
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