Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VI9Y
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: Starter Signal Circuit; 2016 MY Sienna [12/2015 - 08/2016]

Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal ST2 of the ignition switch to the park/neutral position switch and also flows to terminal STA of the ECM (STA signal).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

READ VALUE USING TECHSTREAM (STARTER SIGNAL)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Starter Signal.

(e) Read the value displayed on the Techstream when the ignition switch is turned ON and the engine is started.

OK:

Condition

Techstream Display

Ignition switch ON

OFF

Engine started

ON

Result

Result

Proceed to

NG

A

OK

B

B

GO TO STEP 5

A

2.

INSPECT PARK/NEUTRAL POSITION SWITCH (B - L)

(a) Inspect the park/neutral position switch (See page 2016 MY Sienna [12/2015 - 08/2016]; U660E (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: INSPECTION for 2WD, 2016 MY Sienna [12/2015 - 08/2016]; U660F (AUTOMATIC TRANSMISSION / TRANSAXLE): PARK / NEUTRAL POSITION SWITCH: INSPECTION for AWD).

Result

Result

Proceed to

OK

A

NG

(for 2WD)

B

NG

(for AWD)

C

B

REPLACE PARK/NEUTRAL POSITION SWITCH (FOR 2WD)

C

REPLACE PARK/NEUTRAL POSITION SWITCH (FOR AWD)

A

3.

INSPECT IGNITION SWITCH ASSEMBLY (AM2 - ST2)

(a) Inspect the ignition switch assembly (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE STARTING: IGNITION SWITCH: INSPECTION ).

NG

REPLACE IGNITION SWITCH ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - PARK/NEUTRAL POSITION SWITCH)

(a) Disconnect the ignition switch assembly connector.

(b) Disconnect the park/neutral position switch connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

D27-8 (ST2) - B3-4 (B)

Always

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

D27-8 (ST2) or B3-4 (B) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST RELAY - ECM)

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

(b) Disconnect the park/neutral position switch connector.

(c) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

2 (ST relay holder) - A39-46 (STA)

Always

Below 1 Ω

2 (ST relay holder) - B3-9 (L)

Always

Below 1 Ω

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

2 (ST relay holder) or A39-46 (STA) - body ground

Always

10 kΩ or higher

2 (ST relay holder) or B3-9 (L) - body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

INSPECT BATTERY

(a) Check that the battery is not depleted.

OK:

Battery is not depleted.

NG

REPLACE BATTERY

OK

7.

CHECK BATTERY TERMINAL

(a) Check that the battery terminal are not loose or corroded.

OK:

Battery terminals are not loose or corroded.

OK

REPAIR OR REPLACE STARTER CIRCUIT (STARTER ASSEMBLY - ST RELAY)

NG

REPAIR OR REPLACE BATTERY TERMINAL