Last Modified: 05-13-2024 |
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] |
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
|
OK
|
|
|
2.
|
INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)
|
(a) Inspect the fuel injector assembly.
Click here
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
OK
|
|
|
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
|
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
|
OK
|
|
|
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)
|
OK
|
|
|
6.
|
INSPECT NO. 1 INTEGRATION RELAY (EFI-MAIN RELAY)
|
(a) Inspect the No. 1 integration relay (EFI-MAIN relay).
Click here
OK
|
|
|
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
|
OK
|
|
|
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
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|