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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Connect voltmeter between body ground and terminal No. 10 (Orange wire) at ECM electrical connector E9. See Figure. This is the SPHV terminal on ECM. Drive vehicle at 12 MPH and note voltage. Voltage should pulsate between zero volts and 4.5-5.5 volts. If voltage does not pulsate as specified, go to next step. If voltage pulsates as specified, replace ECM.
  2. Check for open and short in Orange wire and electrical connectors between terminal No. 10 at ECM electrical connector E9 and terminal No. 6 at HV ECU electrical connector H14. For HV ECU electrical terminal identification, see Figure. HV ECU is located below carpet on floor panel, just below passenger's side of instrument panel. See Figure.
  3. If wiring harness or electrical connector is defective, repair as necessary. If wiring harness and electrical connectors are okay, replace HV ECU. If HV ECU is replaced, the HV ECU must be reprogrammed for the engine immobilizer system. Engine immobilizer system may also be referred to as Hybrid Vehicle (HV) immobilizer system. For programming procedures, see HYBRID VEHICLE ELECTRONIC CONTROL UNIT PROGRAMMING  under PROGRAMMING.
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