| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000YSRE |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: Fuel Pump Control Circuit; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
Fuel Pump Control Circuit |
DESCRIPTION
The fuel pump (for low pressure side) circuit consists of the ECM, fuel pump (for low pressure side) and fuel pump control ECU assembly (which operates the fuel pump (for low pressure side)). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump control ECU assembly. Based on the signal sent from the ECM, the fuel pump control ECU assembly adjusts the fuel pump (for low pressure side) operation speed.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
INSPECT FUEL PUMP CONTROL ECU ASSEMBLY |
|
*1 |
Fuel Pump Control ECU Assembly |
- |
- |
(a) Remove the fuel pump control ECU assembly.
Click here
![2017 - 2020 MY Sienna [08/2016 - ]; 2GR-FKS (FUEL): FUEL PUMP ECU: REMOVAL](/t3Portal/stylegraphics/info.gif)
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K43-1 (+B) - K43-3 (GND) |
Always |
200 Ω or higher |
|
K43-1 (+B) - K43-2 (FPC) |
Always |
2 kΩ or higher |
|
K43-2 (FPC) - K43-3 (GND) |
Always |
10 kΩ or higher |
|
K42-1 (FPG) - K43-3 (GND) |
Always |
1 kΩ or higher |
|
K42-2 (FPU) - K43-3 (GND) |
Always |
2 kΩ or higher |
|
K42-3 (FPV) - K43-3 (GND) |
Always |
2 kΩ or higher |
|
K42-4 (FPW) - K43-3 (GND) |
Always |
2 kΩ or higher |
HINT:
This procedure checks for an internal short of the fuel pump control ECU assembly when its transistor is stuck on.
| NG |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE OF FUEL PUMP CONTROL ECU ASSEMBLY) |
|
*a |
Front view of wire harness connector (to Fuel Pump Control ECU Assembly) |
(a) Disconnect the fuel pump control ECU assembly 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 |
|---|---|---|
|
K43-1 (+B) - K43-3 (GND) |
Ignition switch ON |
11 to 14 V |
HINT:
Make a note of the measured voltage as it may be used in a following Active Test.
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU ASSEMBLY - ECM) |
(a) Disconnect the K43 fuel pump control ECU assembly connector.
(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 |
|---|---|---|
|
K43-2 (FPC) - A69-18 (FPC) |
Always |
Below 1 Ω |
|
K43-2 (FPC) or A69-18 (FPC) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP SINGLE PHASE ENERGIZATION) |
|
*1 |
Fuel Pump Control ECU Assembly |
- |
- |
(a) Disconnect the fuel pump control ECU assembly connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.
(f) Operate the fuel pump control ECU assembly using the Active Test function and measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Techstream Operation |
Specified Condition |
|---|---|---|
|
K42-2 (FPU) - Body ground |
U Phase |
4.4 to 8.4 V* |
|
K42-3 (FPV) - Body ground |
V Phase |
4.4 to 8.4 V* |
|
K42-4 (FPW) - Body ground |
W Phase |
4.4 to 8.4 V* |
HINT:
- *: This Active Test restricts the fuel pump control ECU assembly output duty cycle to 50%. Therefore, the output voltage of the fuel pump control ECU assembly will be approximately 50% of the power source voltage measured in a previous step.
- Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).
|
Result |
Proceed to |
|---|---|
|
The U phase, V phase and W phase are all normal |
A |
|
The U phase, V phase or W phase is abnormal |
B |
|
The U phase, V phase and W phase are all abnormal |
C |
| B |
|
| C |
|
|
|
5. |
CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU ASSEMBLY - FUEL PUMP (FOR LOW PRESSURE SIDE)) |
(a) Disconnect the K42 fuel pump control ECU assembly connector.
(b) Disconnect the g3 fuel pump (for low pressure side) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K42-2 (FPU) - g3-3 (BLPU) |
Always |
Below 1 Ω |
|
K42-3 (FPV) - g3-4 (BLPV) |
Always |
Below 1 Ω |
|
K42-4 (FPW) - g3-2 (BLPW) |
Always |
Below 1 Ω |
|
K42-2 (FPU) or g3-3 (BLPU) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
K42-3 (FPV) or g3-4 (BLPV) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
K42-4 (FPW) or g3-2 (BLPW) - Body ground and other terminals |
Always |
10 kΩ or higher |
HINT:
Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).
Click here
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
INSPECT ECM (FPC TERMINAL) |
|
*a |
Front view of wire harness connector (to Fuel Pump Control ECU Assembly) |
(a) Disconnect the fuel pump control ECU assembly connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.
(f) Operate the fuel pump control ECU assembly using the Active Test function and measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Techstream Operation |
Specified Condition |
|---|---|---|
|
K43-2 (FPC) - Body ground |
Before Active Test → During Active Test |
Before Active Test: Resistance is stable → During Active Test: Resistance fluctuates* |
HINT:
*: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the FPC terminal will be unstable during the Active Test. If the resistance is stable before the Active Test and fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.
| OK |
|
| NG |
|
|
7. |
CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - BODY GROUND) |
(a) Disconnect the K43 fuel pump control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K43-3 (GND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
INSPECT EFI MAIN NO. 2 RELAY |
(a) Inspect the EFI MAIN NO. 2 relay.
Click here
| NG |
|
REPLACE EFI MAIN NO. 2 RELAY |
|
|
9. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI MAIN NO. 2 RELAY) |
|
(a) Remove the EFI MAIN NO. 2 relay from the engine room relay block. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
5 (EFI MAIN NO. 2 relay holder) - Body ground |
Ignition switch ON |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
CHECK HARNESS AND CONNECTOR (EFI MAIN NO. 2 RELAY - EFI MAIN NO. 1 RELAY, FUEL PUMP CONTROL ECU, BODY GROUND) |
(a) Remove the EFI MAIN NO. 2 relay from the engine room relay block.
(b) Remove the EFI MAIN NO. 1 relay from the engine room relay block.
(c) Disconnect the K43 fuel pump control ECU connector.
(d) Disconnect the A69 ECM connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (EFI MAIN NO. 2 relay holder) - K43-1 (+B) |
Always |
Below 1 Ω |
|
3 (EFI MAIN NO. 1 relay holder) - 1 (EFI MAIN NO. 2 relay holder) |
Always |
Below 1 Ω |
|
2 (EFI MAIN NO. 2 relay holder) - Body ground |
Always |
Below 1 Ω |
|
3 (EFI MAIN NO. 2 relay holder) or K43-1 (+B) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
3 (EFI MAIN relay holder) or 1 (EFI MAIN NO. 2 relay holder) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
CHECK ECM POWER SOURCE CIRCUIT
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|