Inspection Procedure

READ VALUE OF TECHSTREAM

Connect Techstream to the DLC3.
Turn the engine switch on (IG) and press Techstream main switch on.

Select the items below in the Data List, and read the displays on the tester.

Power Source Control:

DIAGNOSTIC NOTE CHART

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
IG1 Relay Monitor (Outside)	Status of IG1 relay monitor (outer) / ON or OFF	ON: Engine switch ON (IG1 relay is ON) OFF: Engine switch OFF (IG1 relay is OFF)	-

OK: "OK" (engine switch on (IG)) appears on the screen.

Result

RESULT CHART

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

INSPECT RELAY (Marking: IG1)

Remove the IG1 relay from the instrument panel J/B.

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

Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

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: IG1 Relay Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RELAY

OK: Go to next step

CHECK WIRE HARNESS (INSTRUMENT PANEL J/B - POWER SOURCE CONTROL ECU)

Disconnect the II J/B connector.

Fig 2: Disconnecting II J/B Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the D44 ECU connector.

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

Resistance

TERMINAL SPECIFIED CONDITION CHART

Terminal No. (Symbol)	Specified Condition
II-9 - D44-34 (IG1D)	Below 1 Ω
D44-34 (IG1D) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Disconnecting D44 ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK WIRE HARNESS (INSTRUMENT PANEL J/B - BATTERY AND BODY GROUND)

Disconnect the IF and IA J/B connectors.

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

Resistance

TERMINAL SPECIFIED CONDITION CHART

Terminal No.	Condition	Specified value
IF-10 - Body ground	Always	Below 1 Ω

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

Voltage

TERMINAL SPECIFIED CONDITION CHART

Terminal No.	Condition	Specified value
IA-1 - Body ground	Always	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Disconnecting IF And IA J/B Connectors

OK: Go to next step

INSPECT INSTRUMENT PANEL J/B

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

Fig 5: Identifying Instrument Panel J/B

Resistance

TERMINAL SPECIFIED CONDITION CHART

Terminal No.	Condition	Specified value
IF-10 - IG1 relay terminal-1	Always	Below 1 Ω
II-9 - IG1 relay terminal-2	Always	Below 1 Ω

NG: REPLACE INSTRUMENT PANEL J/B

OK : REPLACE POWER SOURCE CONTROL ECU