Inspection Procedure

1. Remove the AM2 fuse from the cowl side junction block RH.
2. Measure the resistance of the fuse.

   Standard resistance: 

   Below 1 Ω 

NG : REPLACE FUSE 

OK : Go to next step 

1. Disconnect the K73 ECU connector.
2. Measure the resistance and voltage of the wire harness side connector.

   Standard voltage 

   VOLTAGE SPECIFIED CONDITIONS
   
   

   Tester Connection	Specified Condition
   K73-33 (AM1) - Body ground	10 to 14 V
   K73-12 (AM2) - Body ground

   Standard resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   K73-6 (GND2) - Body ground	Below 1 Ω

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 1: Identifying K73 Power Source Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step 

Fig 2: Identifying K66 And K73 ECU With W6 Junction Block Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K66 and K73 ECU connectors.
2. Disconnect the W6 junction block connector.
3. Disconnect the Q13 switch connector.
4. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   K73-7 (MPX1) - W6-11 (MPX)	Below 1 Ω
   K73-7 (MPX1) - Q13-3 (MPX1)
   K73-24 (MPX2) - K66-3 (MPD1)

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   All are OK	A
   One or to is / are OK	B
   All are NG	C

B : REPLACE POWER SOURCE CONTROL ECU AND WIRE HARNESS CONNECTOR 

C : REPAIR OR REPLACE HARNESS AND CONNECTOR 

A : REPLACE POWER SOURCE CONTROL ECU