Power Management Control ECU Communication Stop Mode: Procedure

CHECK CAN BUS LINE FOR DISCONNECTION (POWER MANAGEMENT CONTROL ECU BRANCH LINE)

Turn the power switch off.
Disconnect the H4 power management control ECU connector.

Fig 1: Identifying H4 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Switch Condition	Specified Value
H4-25 (CA1H) - H4-24 (CA1L)	Power switch off	54 to 69 Ω

TEXT IN ILLUSTRATION

*a	Rear view of wire harness connector (to Power Management Control ECU)

NG → REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (POWER MANAGEMENT CONTROL ECU)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

Measure the voltage according to the value(s) in the table below.

Fig 2: Identifying H4 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

Tester Connection	Switch Condition	Specified Value
A20-5 (+B1) - Body ground	Power switch on (IG)	11 to 14 V
A19-2 (+B2) - Body ground	Power switch on (IG)	11 to 14 V

TEXT IN ILLUSTRATION

*a	Component with harness connected (Power Management Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE TERMINAL)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

Measure the resistance according to the value(s) in the table below.

Fig 3: Identifying A19 And A20 Connector Terminals

Standard Resistance

Tester Connection	Condition	Specified Value
H3-6 (E1) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*a	Rear view of wire harness connector (to Power Management Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND TERMINAL)

OK → See step 4