Inspection Procedure

1. Check the DATA LIST for proper functioning of the start switch 1 and 2.

   Power source control ECU 

   DATA LIST
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Start Switch 1	Start Switch 1 / ON or OFF	ON: Power switch pushed OFF: Power switch not pushed	-
   Start Switch 2	Start Switch 2 / ON or OFF	ON: Power switch pushed OFF: Power switch not pushed	-

   OK: ON (power switch ON (IG)) appears on the screen. 

OK: REPLACE POWER SOURCE CONTROL ECU 

NG: Go to Next Step 

1. Remove the power switch.
2. Measure the resistance of the switch.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   7 (SS1) - 5 (GND)	Pushed	Below 1 Ω
   2 (SS2) - 5 (GND)	Pushed	Below 1 Ω
   7 (SS1) - 5 (GND)	Not pushed	10 kΩ or higher
   2 (SS2) - 5 (GND)	Not pushed	10 kΩ or higher

Fig 1: Identifying Terminals Of Power Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE POWER SWITCH 

OK: Go to Next Step 

1. Disconnect the K29 switch connector.
2. Disconnect the K73 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   K29-7 (SS1) - K73-14 (SSW1)	Below 1 Ω
   K29-2 (SS2) - K73-37 (SSW2)	Below 1 Ω
   K29-5 (GND) - Body ground	Below 1 Ω
   K29-7 (SS1) or K73-14 (SSW1) - Body ground	10 kΩ or higher
   K29-2 (SS2) or K73-37 (SSW2) - Body ground	10 kΩ or higher

Fig 2: Identifying Terminals Of K73 ECU And K29 Power Switch Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE POWER SOURCE CONTROL ECU