| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIB3 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: Cranking Holding Function Circuit; 2016 MY Sienna [12/2015 - 08/2016] | ||
|
Cranking Holding Function Circuit |
DESCRIPTION
The cranking holding control system keeps energizing the ST relay from when the power management control ECU detects the starter signal from the ignition switch assembly until the power management control ECU performs a judgement of "Engine started".
When the power management control ECU detects the STSW signal, the power management control ECU outputs the ST relay drive signal (STAR signal) to the ST relay through the park/neutral position switch, and then, the engine is cranked. When the power management control ECU receives a stable engine speed signal (NE signal), more specifically, when the NE signal reaches a predetermined value, the power management control ECU stops outputting the STAR signal.
Also, the power management control ECU monitors the ST relay operating conditions based on the STA terminal voltage status.
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) Check the result when the ignition switch is turned ON and the engine starts.
OK:
|
Condition |
Starter Signal |
|---|---|
|
Ignition switch ON |
OFF |
|
Engine start |
ON |
| NG |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM - ST RELAY) |
(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 Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A39-46 (STA) or B3-9 (L) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
INSPECT BATTERY |
(a) Check that the battery is not depleted.
OK:
Battery is not depleted.
| NG |
|
REPLACE BATTERY |
|
|
4. |
CHECK BATTERY TERMINAL |
(a) Check that the battery terminals 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 |
|
5. |
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](/t3Portal/stylegraphics/info.gif)
for 2WD,
for AWD).
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (for 2WD) |
B |
|
NG (for AWD) |
C |
| B |
|
| C |
|
|
|
6. |
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - PARK/NEUTRAL POSITION SWITCH) |
(a) Disconnect the power management control ECU 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 |
|---|---|---|
|
A35-3 (STAR) - B3-4 (B) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A35-3 (STAR) or B3-4 (B) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM - ST RELAY) |
(a) Remove the ST relay from the engine room relay block.
(b) Disconnect the ECM connector.
(c) Disconnect the park/neutral position switch 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 Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A39-46 (STA) or B3-9 (L) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|