| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001GKC8 |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 11/2022] |
| Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: Fuel Injector Circuit; 2020 - 2023 MY Corolla [01/2019 - 11/2022] | ||
|
Fuel Injector Circuit |
DESCRIPTION
The fuel injectors are located on the intake manifold. They inject fuel into the cylinders based on the signals from the ECM.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY) |
|
*a |
Front view of wire harness connector (to Fuel Injector Assembly) |
|
*b |
No. 1 Fuel Injector Assembly |
|
*c |
No. 2 Fuel Injector Assembly |
|
*d |
No. 3 Fuel Injector Assembly |
|
*e |
No. 4 Fuel Injector Assembly |
(a) Disconnect the fuel injector assembly connectors.
(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 |
|---|---|---|
|
C33-1 (#1) - Body ground |
Ignition switch ON |
11 to 14 V |
|
C34-1 (#2) - Body ground |
Ignition switch ON |
11 to 14 V |
|
C35-1 (#3) - Body ground |
Ignition switch ON |
11 to 14 V |
|
C36-1 (#4) - Body ground |
Ignition switch ON |
11 to 14 V |
| NG |
|
|
|
2. |
INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME) |
(a) Inspect the fuel injector assembly.
Click here
![2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (FUEL): FUEL INJECTOR: INSPECTION](/t3Portal/stylegraphics/info.gif)
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
| NG |
|
REPLACE FUEL INJECTOR ASSEMBLY
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) |
(a) Disconnect the fuel injector assembly connectors.
(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 |
|---|---|---|
|
C33-2 (#10) - C77-98 (#10) |
Always |
Below 1 Ω |
|
C34-2 (#20) - C77-95 (#20) |
Always |
Below 1 Ω |
|
C35-2 (#30) - C77-96 (#30) |
Always |
Below 1 Ω |
|
C36-2 (#40) - C77-97 (#40) |
Always |
Below 1 Ω |
|
C33-2 (#10) or C77-98 (#10) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C34-2 (#20) or C77-95 (#20) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C35-2 (#30) or C77-96 (#30) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C36-2 (#40) or C77-97 (#40) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - FUEL INJECTOR ASSEMBLY) |
(a) Disconnect the No. 1 integration relay connector.
(b) Disconnect the fuel injector assembly connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1B-4 - C33-1 (#1) |
Always |
Below 1 Ω |
|
1B-4 - C34-1 (#2) |
Always |
Below 1 Ω |
|
1B-4 - C35-1 (#3) |
Always |
Below 1 Ω |
|
1B-4 - C36-1 (#4) |
Always |
Below 1 Ω |
|
1B-4 or C33-1 (#1) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
1B-4 or C34-1 (#2) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
1B-4 or C35-1 (#3) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
1B-4 or C36-1 (#4) - Body ground and other terminals |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 INTEGRATION RELAY) |
|
*a |
Front view of wire harness connector (to No. 1 Integration Relay) |
(a) Disconnect the No. 1 integration relay connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1B-3 - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - NO. 1 INTEGRATION RELAY) |
|
|
6. |
INSPECT NO. 1 INTEGRATION RELAY (EFI-MAIN RELAY) |
(a) Inspect the No. 1 integration relay (EFI-MAIN relay).
Click here
| NG |
|
REPLACE NO. 1 INTEGRATION RELAY
|
|
|
7. |
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND) |
(a) Disconnect the No. 1 integration relay connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1B-6 - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY - NO. 1 INTEGRATION RELAY) |
(a) Remove the EFI-MAIN relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the No. 1 integration relay connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (EFI-MAIN relay) - 1B-5 |
Always |
Below 1 Ω |
|
3 (EFI-MAIN relay) or 1B-5 - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
GO TO ECM POWER SOURCE CIRCUIT
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|