3Ur-Fe Engine Control. Sfi System Cranking Holding Function Circuit

The cranking holding control system provides current to the starter when the ECM detects the engine switch start signal (STSW). When the ECM performs a firing judgment, the system cuts current to the starter. When an ECM receives the STSW signal, it turns on the ACC cut, which prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to the ECM STAR terminal. Then the STAR output signal travels through the Park/Neutral Position (PNP) switch to the starter relay, causing the starter to activate.
When the engine is cranking, the starter operation signal is sent to the ECM STA terminal.

Land Cruiser. Urj200, 202 Grj200 Vdj200.3Ur-Fe Engine Control.Sfi System.Sfi System Cranking Holding Function Circuit

WIRING DIAGRAM

Refer to DTC P0617 (Click here).

INSPECTION PROCEDURE

1.CHECK CRANKING

Check the cranking of the engine.

Result
Result
Proceed to
Cranking possible and holding control operates
A
Does not crank
B
Cranking possible but holding control does not operate
C

Result
Result	Proceed to
Cranking possible and holding control operates	A
Does not crank	B
Cranking possible but holding control does not operate	C

Go to step 2

Go to step 11

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

2.READ VALUE USING INTELLIGENT TESTER (STARTER SIGNAL)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester on.

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

Check the value displayed on the tester when the engine switch is turned to the START.

Standard:

Engine Switch Position
Display (Starter Signal)
On (IG)
OFF
START
ON

Go to step 7

OK

3.INSPECT STARTER RELAY (ST)

Inspect the starter relay (ST) (Click here).

REPLACE STARTER RELAY

OK

4.CHECK HARNESS AND CONNECTOR (STARTER RELAY - PNP SWITCH)

Remove the starter relay (ST) from the engine room relay block.

Disconnect the C24 PNP switch.

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

Standard Resistance:

Tester Connection
Condition
Specified Condition
ST relay (2) - C24-5
Always
Below 1 Ω
ST relay (2) or C24-5 - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK STARTER RELAY (POWER SOURCE)

Remove the ST relay from the engine room relay block.

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

Standard Voltage:

Tester Connection
Condition
Specified Condition
ST relay (1) - ST relay (5)
Always
11 to 14 V

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

OK

6.INSPECT STARTER

Inspect the starter (Click here).

REPAIR OR REPLACE STARTER (Click here)

REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER - STARTER RELAY (ST), BATTERY)

7.INSPECT STARTER CUT RELAY (ST CUT)

Inspect the starter cut relay (ST CUT) (Click here).

REPLACE STARTER CUT RELAY

OK

8.CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM)

Remove the starter cut relay (ST CUT) from the engine room relay block.

Disconnect the C24 PNP switch connector.

Disconnect the C45 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ST CUT relay (5) - C45-16 (STAR)	Always	Below 1 Ω
ST CUT relay (3) - C24-4	Always	Below 1 Ω
ST CUT relay (5) or C45-16 (STAR) - Body ground	Always	10 kΩ or higher
ST CUT relay (3) or C24-4 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.INSPECT PARK/NEUTRAL POSITION SWITCH

Inspect the park/neutral position switch (Click here).

REPLACE PARK/NEUTRAL POSITION SWITCH (Click here)

OK

10.CHECK HARNESS AND CONNECTOR (PNP SWITCH - ECM)

Disconnect the C24 PNP switch connector.

Disconnect the A38 ECM connector.

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

Standard Resistance:

Tester Connection
Condition
Specified Condition
C24-5 - A38-46 (STA)
Always
Below 1 Ω
C24-5 or A38-46 (STA) - Body ground
Always
10 kΩ or higher

Result
Result
Proceed to
NG
A
OK
B

Go to step 13

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)

Disconnect the E4 main body ECU connector.

Disconnect the A38 ECM connector.

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

Standard Resistance:

Tester Connection
Condition
Specified Condition
E4-4 (STSW) - A38-14 (STSW)
Always
Below 1 Ω
E4-4 (STSW) or A38-14 (STSW) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

12.CHECK HARNESS AND CONNECTOR (STARTER CUT RELAY - PNP SWITCH, ECM)

Remove the starter cut relay (ST CUT) from the engine room relay block.

Disconnect the C24 PNP switch connector.

Disconnect the C45 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
ST CUT relay (5) - C45-16 (STAR)	Always	Below 1 Ω
ST CUT relay (3) - C24-4	Always	Below 1 Ω
ST CUT relay (5) or C45-16 (STAR) - Body ground	Always	10 kΩ or higher
ST CUT relay (3) or C24-4 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM (Click here)

13.REPLACE ECM

Replace the ECM (Click here).

NEXT

14.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Check the starter operation.
OK:
Malfunction has been repaired successfully.

GO TO ENTRY AND START SYSTEM (ENGINE DOES NOT START) (Click here)

END

Engine Switch Position	Display (Starter Signal)
On (IG)	OFF
START	ON