Inspection Procedure

1. Remove the AM2 fuse from the main body ECU 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 resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

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

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

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

   Fig 1: Identifying K73 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO Next Step 

Fig 2: Identifying K66 And K73 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

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

   Result 

   RESULT REFERENCE CHART
   
   

   Result	Proceed to
   Both are OK	A
   One is OK	B
   Both are NG	C

B: REPAIR OR REPLACE POWER SOURCE CONTROL ECU AND WIRE HARNESS OR CONNECTOR 

C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

A: REPLACE POWER SOURCE CONTROL ECU