Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001GKC7
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 11/2022]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: Fuel Pump Control Circuit; 2020 - 2023 MY Corolla [01/2019 - 11/2022]

Fuel Pump Control Circuit

DESCRIPTION

When the engine is cranked, the ST relay drive signal output from the ignition or starter switch assembly*1 or certification ECU (smart key ECU assembly)*2 is input into the STA terminal of the ECM, and the NE signal generated by the crank position sensor is also input into the NE+ terminal. The ECM interprets that the engine is cranked, and turns transistor Tr1 in the ECM internal circuit on. Current flows to the C/OPN relay by turning Tr1 on. Then, the fuel pump operates.

While the NE signal is input into the ECM with the engine running, the ECM turns Tr1 on continuously.

  • *1: w/o Smart Key System
  • *2: w/ Smart Key System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

(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 and ECT / Active Test / Control the Fuel Pump/Speed.

Powertrain > Engine and ECT > Active Test

Tester Display

Control the Fuel Pump / Speed

(e) Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream.

Result

Proceed to

Fuel pump operating sound does not occur

A

Fuel pump operating sound occurs

B
B

GO TO STEP 10

A

2.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY)

(a) Remove the C/OPN relay from the No. 1 engine room relay block and No. 1 junction block assembly.

*1

No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

*2

C/OPN Relay

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

1 (C/OPN relay) - Body ground

Ignition switch ON

11 to 14 V
NG

GO TO STEP 9

OK

3.

INSPECT C/OPN RELAY

(a) Inspect the C/OPN relay.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): RELAY: ON-VEHICLE INSPECTION+

NG

REPLACE C/OPN RELAY
OK

4.

CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)

(a) Remove the C/OPN 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 (C/OPN relay) - A46-41 (FC)

Always

Below 1 Ω

2 (C/OPN relay) or A46-41 (FC) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP)

(a) Remove the C/OPN relay from the No. 1 engine room relay block and No. 1 junction block assembly.

(b) Disconnect the fuel pump connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (C/OPN relay) - O44-4 (B)

Always

Below 1 Ω

3 (C/OPN relay) or O44-4 (B) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

(a) Disconnect the fuel pump connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O44-5 (E) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

INSPECT FUEL PUMP

(a) Inspect the fuel pump.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (FUEL): FUEL PUMP (w/ Canister Pump Module): INSPECTION

HINT:

Perform "Inspection After Repair" after replacing the fuel pump.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE FUEL PUMP 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (FUEL): FUEL PUMP (w/ Canister Pump Module): REMOVAL 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (FUEL): FUEL PUMP (w/ Canister Pump Module): REMOVAL 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (FUEL): FUEL PUMP (w/ Canister Pump Module): REMOVAL

OK

8.

CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY - C/OPN RELAY)

(a) Remove the EFI-MAIN relay and C/OPN 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

3 (EFI-MAIN relay) - 5 (C/OPN relay)

Always

Below 1 Ω

3 (EFI-MAIN relay) or 5 (C/OPN relay) - Body ground and other terminals

Always

10 kΩ or higher
OK

GO TO ECM POWER SOURCE CIRCUIT 2020 - 2022 MY Corolla [01/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: ECM Power Source Circuit 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: ECM Power Source Circuit

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - C/OPN RELAY)

(a) Disconnect the No. 1 integration relay connector.

(b) Remove the C/OPN relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1A-9 - 1 (C/OPN relay)

Always

Below 1 Ω

1A-9 or 1 (C/OPN relay) - Body ground and other terminals

Always

10 kΩ or higher
OK

GO TO ECM POWER SOURCE CIRCUIT 2020 - 2022 MY Corolla [01/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: ECM Power Source Circuit 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: ECM Power Source Circuit

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

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 and ECT / Data List / Starter Signal.

Powertrain > Engine and ECT > Data List

Tester Display

Starter Signal

(e) Check the result when the ignition switch is ON and the engine starts.

OK:

Condition

Starter Signal

Ignition switch ON

OFF

Engine started

ON
NG

CHECK STARTER SIGNAL CIRCUIT 2020 - 2022 MY Corolla [01/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: Starter Signal Circuit 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: Starter Signal Circuit

OK

11.

READ VALUE USING TECHSTREAM (ENGINE SPEED)

(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 and ECT / Data List / Engine Speed.

Powertrain > Engine and ECT > Data List

Tester Display

Engine Speed

(e) Read the values displayed on the Techstream while cranking.

OK:

Values are displayed continuously.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 2020 - 2022 MY Corolla [01/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: PROBLEM SYMPTOMS TABLE

NG

CHECK CRANK POSITION SENSOR CIRCUIT 2020 MY Corolla [01/2019 - 03/2019]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0335,P0339; Crankshaft Position Sensor "A" Circuit 2020 MY Corolla [03/2019 - 04/2020]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0335,P0339; Crankshaft Position Sensor "A" Circuit 2021 - 2023 MY Corolla [04/2020 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0335,P0339; Crankshaft Position Sensor "A" Circuit