| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM1000000019SS5 |
| Model Year Start: 2018 | Model: Sienna | Prod Date Range: [11/2017 - ] |
| Title: 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: ECM Power Source Circuit; 2018 - 2020 MY Sienna [11/2017 - ] | ||
|
ECM Power Source Circuit |
DESCRIPTION
When the ignition switch is turned ON, the battery voltage is applied to the IGSW terminal of the ECM.
The output signal from the MREL terminal of the ECM causes a current to flow to the coil of the semiconductor pwr integration ECU (EFI MAIN relay), closing the contacts and supplying power to terminals +B and +B2 of the ECM.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) |
(a) Disconnect the B67 ECM connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B67-53 (E1) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
2. |
INSPECT ECM (IGSW VOLTAGE) |
|
(a) Disconnect the ECM connector. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A69-4 (IGSW) - Body ground |
Ignition switch ON |
11 to 14 V |
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (w/ Smart Key System) |
B |
|
NG (w/o Smart Key System) |
C |
| B |
|
| C |
|
|
|
3. |
INSPECT ECM (MREL VOLTAGE) |
|
(a) Remove the EFI MAIN relay from the engine room relay block. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
1 (EFI MAIN relay holder) - Body ground |
Ignition switch ON |
11 to 14 V |
| NG |
|
|
|
4. |
INSPECT EFI MAIN RELAY |
(a) Inspect the EFI MAIN relay.
Click here
![2017 - 2020 MY Sienna [08/2016 - ]; 2GR-FKS (ENGINE CONTROL): RELAY: ON-VEHICLE INSPECTION](/t3Portal/stylegraphics/info.gif)
| NG |
|
REPLACE EFI MAIN RELAY |
|
|
5. |
CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY) |
(a) Remove the EFI MAIN relay from the engine room relay block.
(b) Remove the EFI-MAIN No. 2 relay from the engine room relay block.
HINT:
Remove the EFI-MAIN NO. 2 relay connected between the checked terminals as the coil inside the relay influences the measurement value.
(c) Disconnect the A69 ECM connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (EFI MAIN relay holder) - A69-2 (+B) |
Always |
Below 1 Ω |
|
3 (EFI MAIN relay holder) - A69-3 (+B2) |
Always |
Below 1 Ω |
|
3 (EFI MAIN relay holder) or A69-2 (+B) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
3 (EFI MAIN relay holder) or A69-3 (+B2) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - ECM) |
|
|
6. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI MAIN RELAY) |
|
(a) Remove the EFI MAIN relay from the engine room relay block. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
5 (EFI MAIN relay holder) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - BATTERY) |
|
|
7. |
CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY - BODY GROUND) |
(a) Remove the EFI MAIN relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (EFI MAIN relay holder) - Body ground |
Always |
Below 1 Ω |
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY TERMINAL - ECM) |
(a) Disconnect the A69 ECM connector.
(b) Remove the EFI MAIN relay from the engine room relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A69-46 (MREL) - 1 (EFI MAIN relay holder) |
Always |
Below 1 Ω |
|
A69-46 (MREL) or 1 (EFI MAIN relay holder) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - ECM) |
|
9. |
INSPECT IG2 RELAY |
(a) Inspect the IG2 relay.
Click here
| NG |
|
REPLACE IG2 RELAY |
|
|
10. |
CHECK HARNESS AND CONNECTOR (IG2 RELAY - ECM) |
(a) Remove the IG2 relay from the engine room relay block.
(b) Disconnect the A69 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (IG2 relay holder) -A69-4 (IGSW) |
Always |
Below 1 Ω |
|
3 (IG2 relay holder) or A69-4 (IGSW) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
11. |
CHECK HARNESS AND CONNECTOR (IG2 RELAY POWER SOURCE) |
|
(a) Remove the IG2 relay from the engine room relay block. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
5 (IG2 relay holder) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BATTERY) |
|
|
12. |
CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND) |
(a) Remove the IG2 relay from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (IG2 relay holder) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
13. |
CHECK HARNESS AND CONNECTOR (IG2 RELAY - POWER MANAGEMENT CONTROL ECU) |
(a) Disconnect the A35 management control ECU connector.
(b) Remove the IG2 relay from the engine room relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (IG2 relay holder) -A35-8 (IG2D) |
Always |
Below 1 Ω |
|
1 (IG2 relay holder) - A35-8 (IG2D) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
14. |
INSPECT IGNITION SWITCH ASSEMBLY |
(a) Inspect the ignition switch assembly.
Click here
| NG |
|
|
|
15. |
CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - ECM) |
(a) Disconnect the D27 ignition or starter switch assembly connector.
(b) Remove the IG2 relay from the engine room relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D27-6 (IG2) - 1 (IG2 relay holder) |
Always |
Below 1 Ω |
|
D27-6 (IG2) or 1 (IG2 relay holder) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|