Sfi System Fuel Injector Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT FUEL INJECTOR (POWER SOURCE)
INSPECT FUEL INJECTOR (INJECTOR RESISTANCE)
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - ECM)
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
INSPECT FUEL INJECTOR (INJECTION AND VOLUME)
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - INTEGRATION RELAY)
SFI SYSTEM - 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
INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.INSPECT FUEL INJECTOR (POWER SOURCE) |
Disconnect the fuel injector connectors.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
B9-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
B10-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
B11-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
B12-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
Reconnect the fuel injector connectors.
| 2.INSPECT FUEL INJECTOR (INJECTOR RESISTANCE) |
Inspect the fuel injector (COROLLA_ZRE142 RM000000VZW035X.html).
| 3.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - ECM) |
Disconnect the ECM connector.
Disconnect the fuel injector connectors.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection
| Condition
| Specified Condition
|
B9-2 - B31-108 (#10)
| Always
| Below 1 Ω
|
B10-2 - B31-107 (#20)
| Always
| Below 1 Ω
|
B11-2 - B31-106 (#30)
| Always
| Below 1 Ω
|
B12-2 - B31-105 (#40)
| Always
| Below 1 Ω
|
- Standard Resistance (Check for Short):
Tester Connection
| Condition
| Specified Condition
|
B9-2 or B31-108 (#10) - Body ground
| Always
| 10 kΩ or higher
|
B10-2 or B31-107 (#20) - Body ground
| Always
| 10 kΩ or higher
|
B11-2 or B31-106 (#30) - Body ground
| Always
| 10 kΩ or higher
|
B12-2 or B31-105 (#40) - Body ground
| Always
| 10 kΩ or higher
|
Reconnect the fuel injector connectors.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR - ECM) |
|
|
| 4.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) |
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection
| Condition
| Specified Condition
|
B31-45 (E01) - Body ground
| Always
| Below 1 Ω
|
B31-44 (E02) - Body ground
| Always
| Below 1 Ω
|
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND) |
|
|
| 5.INSPECT FUEL INJECTOR (INJECTION AND VOLUME) |
Check the fuel injector injection and volume (COROLLA_ZRE142 RM000000VZW035X.html).
| 6.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - INTEGRATION RELAY) |
Disconnect the fuel injector connectors.
Remove the integration relay from the engine room relay block.
Disconnect the integration relay connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
Tester Connection
| Condition
| Specified Condition
|
B9-1 - 1A-4
| Always
| Below 1 Ω
|
B10-1 - 1A-4
| Always
| Below 1 Ω
|
B11-1 - 1A-4
| Always
| Below 1 Ω
|
B12-1 - 1A-4
| Always
| Below 1 Ω
|
- Standard Resistance (Check for Short):
Tester Connection
| Condition
| Specified Condition
|
B9-1 or 1A-4 - Body ground
| Always
| 10 kΩ or higher
|
B10-1 or 1A-4 - Body ground
| Always
| 10 kΩ or higher
|
B11-1 or 1A-4 - Body ground
| Always
| 10 kΩ or higher
|
B12-1 or 1A-4 - Body ground
| Always
| 10 kΩ or higher
|
Reconnect the fuel injector connectors.
Reconnect the integration relay connector.
Reinstall the integration relay.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR - INTEGRATION RELAY) |
|
|
