| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AWD4 |
| Model Year Start: 2019 | Model: Avalon | Prod Date Range: [04/2018 - ] |
| Title: 2GR-FKS (ENGINE CONTROL): SFI SYSTEM: Fuel Pump Control Circuit; 2019 - 2022 MY Avalon [04/2018 - ] | ||
|
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 (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. Based on the signal sent from the ECM, the fuel pump control ECU 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 |
|
*1 |
Fuel Pump Control ECU |
- |
- |
(a) Remove the fuel pump control ECU.
Click here
![2019 - 2021 MY Avalon [04/2018 - 08/2021]; 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 |
|---|---|---|
|
K15-1 (+B) - K15-3 (GND) |
Always |
200 Ω or higher |
|
K15-1 (+B) - K15-2 (FPC) |
Always |
2 kΩ or higher |
|
K15-2 (FPC) - K15-3 (GND) |
Always |
10 kΩ or higher |
|
K14-1 (FPG) - K15-3 (GND) |
Always |
1 kΩ or higher |
|
K14-2 (FPU) - K15-3 (GND) |
Always |
2 kΩ or higher |
|
K14-3 (FPV) - K15-3 (GND) |
Always |
2 kΩ or higher |
|
K14-4 (FPW) - K15-3 (GND) |
Always |
2 kΩ or higher |
HINT:
This procedure checks for an internal short of the fuel pump control ECU when its transistor is stuck on.
| NG |
|
REPLACE FUEL PUMP CONTROL ECU
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE OF FUEL PUMP CONTROL ECU) |
|
*a |
Front view of wire harness connector (to Fuel Pump Control ECU) |
(a) Disconnect the fuel pump control ECU connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K15-1 (+B) - K15-3 (GND) |
Engine switch on (IG) |
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 - ECM) |
(a) Disconnect the fuel pump control ECU assembly connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
K15-2 (FPC) - A18-18 (FPC) |
Always |
Below 1 Ω |
|
K15-2 (FPC) or A18-18 (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 |
- |
- |
(a) Disconnect the K14 fuel pump control ECU connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.
Powertrain > Engine > Active Test
|
Tester Display |
|---|
|
Fuel Pump Single Phase Energization |
(f) Operate the fuel pump control ECU 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 |
|---|---|---|
|
K14-2 (FPU) - Body ground |
U Phase |
4.4 to 8.4 V* |
|
K14-3 (FPV) - Body ground |
V Phase |
4.4 to 8.4 V* |
|
K14-4 (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 |
|
REPLACE FUEL PUMP CONTROL ECU
|
| C |
|
|
|
5. |
CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - FUEL PUMP (FOR LOW PRESSURE SIDE)) |
(a) Disconnect the fuel pump control ECU connector.
(b) Disconnect the 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 |
|---|---|---|
|
K14-2 (FPU) - K37-3 (BLPU) |
Always |
Below 1 Ω |
|
K14-3 (FPV) - K37-4 (BLPV) |
Always |
Below 1 Ω |
|
K14-4 (FPW) - K37-2 (BLPW) |
Always |
Below 1 Ω |
|
K14-2 (FPU) or K37-3 (BLPU) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
K14-3 (FPV) or K37-4 (BLPV) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
K14-4 (FPW) or K37-2 (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 |
|
REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
INSPECT ECM (FPC TERMINAL) |
|
*a |
Front view of wire harness connector (to Fuel Pump Control ECU) |
(a) Disconnect the fuel pump control ECU connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.
Powertrain > Engine > Active Test
|
Tester Display |
|---|
|
Fuel Pump Single Phase Energization |
(f) Operate the fuel pump control ECU 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 |
|---|---|---|
|
K15-2 (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 |
|
REPLACE FUEL PUMP CONTROL ECU
|
| NG |
|
REPLACE ECM
|
|
7. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE OF EFI-MAIN NO. 2 RELAY) |
(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (EFI-MAIN NO. 2 relay) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 2 RELAY) |
|
|
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 HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - ECM) |
(a) Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (EFI-MAIN NO. 1 relay) - A18-46 (MREL) |
Always |
Below 1 Ω |
|
2 (EFI-MAIN NO. 1 relay) or A18-46 (MREL) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY) |
(a) Remove the EFI-MAIN NO. 1 and EFI-MAIN NO. 2 relays from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
5 (EFI-MAIN NO. 1 relay) - 2 (EFI-MAIN NO. 2 relay) |
Always |
Below 1 Ω |
|
5 (EFI-MAIN NO. 1 relay) or 2 (EFI-MAIN NO. 2 relay) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
11. |
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND) |
(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (EFI-MAIN NO. 2 relay) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
12. |
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - FUEL PUMP CONTROL ECU) |
(a) Remove the EFI-MAIN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the fuel pump control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
5 (EFI-MAIN NO. 2 relay) - K15-1 (+B) |
Always |
Below 1 Ω |
|
5 (EFI-MAIN NO. 2 relay) or K15-1 (+B) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
13. |
CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - BODY GROUND) |
(a) Disconnect the 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 |
|---|---|---|
|
K15-3 (GND) - Body ground |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|