| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001GIM6 |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: Fuel Injector Circuit; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
|
Fuel Injector Circuit |
DESCRIPTION
The fuel injector assemblies are located in each intake port and 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) |
(a) Disconnect the fuel injector assembly connector.
(b) Turn the power switch on (IG).
(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 |
Power switch on (IG) |
11 to 14 V |
|
C34-1 (#2) - Body ground |
Power switch on (IG) |
11 to 14 V |
|
C35-1 (#3) - Body ground |
Power switch on (IG) |
11 to 14 V |
|
C36-1 (#4) - Body ground |
Power switch on (IG) |
11 to 14 V |
| NG |
|
|
|
2. |
INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME) |
(a) Inspect the fuel injector assembly.
Click here
![2020 - 2025 MY Corolla Corolla HV [01/2019 - ]; 2ZR-FXE (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 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 |
|---|---|---|
|
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 connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2A-9 - C33-1 (#1) |
Always |
Below 1 Ω |
|
2A-9 - C34-1 (#2) |
Always |
Below 1 Ω |
|
2A-9 - C35-1 (#3) |
Always |
Below 1 Ω |
|
2A-9 - C36-1 (#4) |
Always |
Below 1 Ω |
|
2A-9 or C33-1 (#1) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
2A-9 or C34-1 (#2) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
2A-9 or C35-1 (#3) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
2A-9 or C36-1 (#4) - Body ground and other terminals |
Always |
10 kΩ or higher |
HINT:
If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|