Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026ZD4 |
Model Year Start: 2023 |
Model: Corolla |
Prod Date Range: [09/2022 -
] |
Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: Fuel Injector Circuit; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] |
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
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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
|
OK
|
|
|
2.
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INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)
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(a) Inspect the fuel injector assembly.
Click here
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
OK
|
|
|
3.
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CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
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(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) - C147-34 (#10)
|
Always
|
Below 1 Ω
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C34-2 (#20) - C147-35 (#20)
|
Always
|
Below 1 Ω
|
C35-2 (#30) - C147-36 (#30)
|
Always
|
Below 1 Ω
|
C36-2 (#40) - C147-37 (#40)
|
Always
|
Below 1 Ω
|
C33-2 (#10) or C147-34 (#10) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
C34-2 (#20) or C147-35 (#20) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
C35-2 (#30) or C147-36 (#30) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
C36-2 (#40) or C147-37 (#40) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
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4.
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CHECK HARNESS AND CONNECTOR (IGP-MAIN RELAY - FUEL INJECTOR ASSEMBLY)
|
(a) Disconnect the IGP-MAIN relay from No. 1 engine room relay block and No. 1 junction block assembly.
(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
|
3 (IGP-MAIN relay) - C33-1 (#1)
|
Always
|
Below 1 Ω
|
3 (IGP-MAIN relay) - C34-1 (#2)
|
Always
|
Below 1 Ω
|
3 (IGP-MAIN relay) - C35-1 (#3)
|
Always
|
Below 1 Ω
|
3 (IGP-MAIN relay) - C36-1 (#4)
|
Always
|
Below 1 Ω
|
3 (IGP-MAIN relay) or C33-1 (#1) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
3 (IGP-MAIN relay) or C34-1 (#2) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
3 (IGP-MAIN relay) or C35-1 (#3) - Body ground and other terminals
|
Always
|
10 kΩ or higher
|
3 (IGP-MAIN relay) 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.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|