Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN BUS LINE FOR DISCONNECTION (HYBRID VEHICLE CONTROL ECU BRANCH WIRE)

Disconnect the H14 hybrid vehicle control ECU connector.

Measure the resistance of the wire harness side connector.

Standard resistance

TESTER CONNECTION - SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
H14-8 (CANH) - H14-9 (CANL)	Power switch OFF	54 to 69 Ω

Fig 1: Checking CAN Bus Line Disconnection (Hybrid Vehicle Control ECU Branch Wire)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE HYBRID VEHICLE CONTROL ECU BRANCH WIRE AND CONNECTOR (CANH, CANL)

OK : GO TO NEXT STEP

CHECK WIRE HARNESS (HYBRID VEHICLE CONTROL ECU - BATTERY AND BODY GROUND)

Disconnect the H16 hybrid vehicle control ECU connector.

Measure the resistance of the wire harness side connector.

Standard resistance

TESTER CONNECTION - SPECIFIED CONDITION

Tester Connection	Specified Condition
H14-1 (GND1) - Body ground	Below 1 Ω
H14-4 (GND2) - Body ground	Below 1 Ω

Measure the voltage of the wire harness side connectors.

Standard voltage

TESTER CONNECTION - SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
H16-7 (+B1) - Body ground	Power switch ON (IG)	10 to 14 V
H16-6 (+B2) - Body ground	Power switch ON (IG)	10 to 14 V

Fig 2: Checking Wire Harness (Hybrid Vehicle Control ECU - Battery And Body Ground)

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR

OK : REPLACE HYBRID VEHICLE CONTROL ECU