Inspection Procedure

1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG) and press the intelligent tester main switch on.
3. Read the Data List according to the displays on the tester.

   PWR SOURCE CTRL (Power source control ECU): 

   DATA LIST (POWER SOURCE CONTROL ECU)
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   ACC RELAY MON	Status of ACC Relay Monitor / ON or OFF	ON: Engine switch ON (ACC) OFF: Engine switch OFF	-

   OK: 

   "ON" (engine switch on (ACC)) appears on the screen. 

   Result 

   RESULT REFERENCE
   
   

   Condition	Proceed to
   NG	C
   OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)	B
   OK (When troubleshooting according to the DTC chart)	A

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

C: Go to step 2 

A: REPLACE POWER SOURCE CONTROL ECU 

1. Remove the ACC relay for the instrument panel J/B.
2. Measure the resistance according to the value(s) in the table below.

   Resistance 

   CONNECTOR TERMINALS RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

   Fig 1: Inspecting Relay (Marking ACC)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RELAY 

OK: Go to Next Step 

1. Disconnect the D44 ECU connector.
   Fig 2: Disconnecting D44 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Resistance 

   CONNECTOR TERMINALS RESISTANCE SPECIFICATION
   
   

   Terminal No. (Symbol)	Specified Condition
   R/B ACC relay terminal 2 - D44-11 (ACCD)	Below 1 Ω
   R/B ACC relay terminal 2 - Body ground	10 kΩ or higher
   R/B ACC relay terminal 1 - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying ACC Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE POWER SOURCE CONTROL ECU