2Tr-Fe Engine Control. Sfi System Starter Signal Circuit

While the engine is being cranked, current flows from terminal ST1 of the ignition switch to the park/neutral position switch (for automatic transmission) or clutch start switch (for manual transmission) and also flows to terminal STA of the ECM (STA Signal).

WIRING DIAGRAM

Refer to DTC P0617 (LandCruiser RM000000TA01KOX_05.html).

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

This chart is based on the premise that the engine can be cranked normally. If the engine does not crank normally, proceed to Problem Symptoms Table (LandCruiser RM000000PDG10AX.html).

1.CHECK IF VEHICLE IS EQUIPPED WITH ENTRY AND START SYSTEM

Confirm the vehicle specifications.

Result:

Result	Proceed to
w/o Entry and Start System	A
w/ Entry and Start System	B

Go to step 14

A

2.READ VALUE USING GTS

Connect the GTS to DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Starter Signal.

Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

OK:

Ignition Switch Position	Starter Signal
ON	OFF
START	ON

Go to step 3

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000000VNL00AX.html)

3.CHECK ST RELAY (POWER SOURCE)

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.2Tr-Fe Engine Control.Sfi System.Sfi System Starter Signal Circuit

Remove the ST relay from the engine room relay block assembly.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
ST relay terminal 2 - Body ground	Engine cranking	11 to 14 V

HINT:

The engine does not crank because the relay is not installed.

Text in Illustration
*1	Engine Room Relay Block Assembly
*2	ST Relay

Result:

Result	Proceed to
OK	A
NG (for Manual Transmission Models)	B
NG (for Automatic Transmission Models)	C

Go to step 6

Go to step 10

A

4.INSPECT RELAY (ST RELAY)

Inspect the ST relay (LandCruiser RM000001FFP05EX_01_0001.html).

REPLACE RELAY (ST RELAY)

OK

5.CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

Remove the ST relay from the engine room relay block assembly.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ST relay terminal 1 - Body ground	Always	Below 1 Ω

Result:

Result	Proceed to
OK (for Manual Transmission Models)	A
OK (for Automatic Transmission Models)	B
NG	C

REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH)

REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - CLUTCH PEDAL SWITCH)

6.CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH ASSEMBLY, ECM)

Remove the ST relay from the engine room relay block assembly.

Disconnect the clutch start switch assembly connector.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ST relay terminal 2 - A41-1	Always	Below 1 Ω
ST relay terminal 2 - C154-17 (STA)	Always	Below 1 Ω
ST relay terminal 2, A41-1 or C154-17 (STA) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.INSPECT CLUTCH START SWITCH ASSEMBLY

Inspect the clutch start switch assembly (See page)LandCruiser RM0000032S300DX.html.

REPLACE CLUTCH START SWITCH ASSEMBLY (LandCruiser RM00000176C00OX.html)

OK

8.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY)

Disconnect the ignition switch assembly connector.

Disconnect the clutch start switch assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G2-1 (ST1) - A41-2	Always	Below 1 Ω
G2-1 (ST1) or A41-2 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

Inspect the ignition switch assembly (LandCruiser RM00000474M00DX.html).

REPLACE IGNITION OR STARTER SWITCH ASSEMBLY (LandCruiser RM000000YK103JX.html)

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY)

10.CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY, ECM)

Remove the ST relay from the engine room relay block assembly.

Disconnect the park/neutral position switch assembly connector.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C159-5 (L) - ST relay terminal 2	Always	Below 1 Ω
C154-17 (STA) - ST relay terminal 2	Always	Below 1 Ω
C159-5 (L), C154-17 (STA) or ST relay terminal 2 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

Inspect the park/neutral position switch assembly (LandCruiser RM000000OD401HX.html).

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY (LandCruiser RM000000O5O01MX.html)

OK

12.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY, ECM)

Disconnect the park/neutral position switch assembly connector.

Disconnect the ignition switch assembly connector.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G2-1 (ST1) - C159-4 (B)	Always	Below 1 Ω
G2-1 (ST1) - C154-15 (NSW)	Always	Below 1 Ω
G2-1 (ST1), C159-4 (B) or C154-15 (NSW) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

13.INSPECT IGNITION OR STARTER SWITCH ASSEMBLY

Inspect the ignition switch assembly (LandCruiser RM00000474M00DX.html).

REPLACE IGNITION OR STARTER SWITCH ASSEMBLY (LandCruiser RM000000YK103JX.html)

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY)

14.READ VALUE USING GTS (STARTER SIGNAL)

Connect the GTS to DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Starter Signal.

Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

OK:

Ignition Switch Position	Starter Signal
ON	OFF
START	ON

Result:

Result	Proceed to
NG	A
OK	B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000000PDG10AX.html)

A

15.INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

Inspect the park/neutral position switch assembly (LandCruiser RM000000OD401HX.html).

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY (LandCruiser RM000000O5O01MX.html)

OK

16.CHECK HARNESS AND CONNECTOR (ST RELAY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY, ECM)

Remove the ST relay from the engine room relay block assembly.

Disconnect the park/neutral position switch assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ST relay terminal 2 - C159-5(L)	Always	Below 1 Ω
ST relay terminal 2 - C154-17 (STA)	Always	Below 1 Ω
ST relay terminal 2, C159-5 (L) or C154-17 (STA) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

17.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY, ECM)

Disconnect the park/neutral position switch assembly connector.

Disconnect the certification ECU (smart key ECU assembly) connector.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G50-3 (STAR) - C159-4 (B)	Always	Below 1 Ω
G50-3 (STAR) - C154-15 (NSW)	Always	Below 1 Ω
G50-3 (STAR) or C159-4 (B) or C154-15 (NSW) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

GO TO ENTRY AND START SYSTEM (LandCruiser RM000000YEF0MNX.html)