Sfi System Fuel Injector Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)
INSPECT FUEL INJECTOR ASSEMBLY
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
CHECK HARNESS AND CONNECTOR (INJ NO. 2 RELAY - FUEL INJECTOR ASSEMBLY)
INSPECT INJ NO. 2 RELAY
CHECK HARNESS AND CONNECTOR (INJ NO. 2 RELAY - BATTERY)
CHECK HARNESS AND CONNECTOR (INJ NO. 2 RELAY - BODY
GROUND)
CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (EFI RELAY) - INJ NO. 2 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.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE) |
Disconnect the fuel injector assembly connectors.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
C50-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
C2-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
C51-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
C4-1 - Body ground
| Ignition switch ON
| 11 to 14 V
|
Text in Illustration*a
| Front view of wire harness connector
(to Fuel Injector Assembly)
|
ResultResult
| Proceed to
|
OK
| A
|
NG
| B
|
| 2.INSPECT FUEL INJECTOR ASSEMBLY |
Inspect the fuel injector assembly (LandCruiser RM000000WQQ0BIX.html).
- HINT:
- Perform "Inspection After Repair" after replacing the fuel injector assembly (LandCruiser RM000004NJC03XX.html).
| 3.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) |
Disconnect the fuel injector assembly connectors.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance :
Tester Connection
| Condition
| Specified Condition
|
C50-2 - C154-4 (#10)
| Always
| Below 1 Ω
|
C2-2 - C154-3 (#20)
| Always
| Below 1 Ω
|
C51-2 - C154-2 (#30)
| Always
| Below 1 Ω
|
C4-2 - C154-1 (#40)
| Always
| Below 1 Ω
|
C50-2 or C154-4 (#10) - Body ground
| Always
| 10 kΩ or higher
|
C2-2 or C154-3 (#20) - Body ground
| Always
| 10 kΩ or higher
|
C51-2 or C154-2 (#30) - Body ground
| Always
| 10 kΩ or higher
|
C4-2 or C154-1 (#40) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) |
|
|
| 4.CHECK HARNESS AND CONNECTOR (INJ NO. 2 RELAY - FUEL INJECTOR ASSEMBLY) |
Disconnect the fuel injector assembly connectors.
Remove the INJ NO. 2 relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
C50-1 - INJ NO. 2 relay terminal 3
| Always
| Below 1 Ω
|
C2-1 - INJ NO. 2 relay terminal 3
| Always
| Below 1 Ω
|
C51-1 - INJ NO. 2 relay terminal 3
| Always
| Below 1 Ω
|
C4-1 - INJ NO. 2 relay terminal 3
| Always
| Below 1 Ω
|
C50-1 or INJ NO. 2 relay terminal 3 - Body ground
| Always
| 10 kΩ or higher
|
C2-1 or INJ NO. 2 relay terminal 3 - Body ground
| Always
| 10 kΩ or higher
|
C51-1 or INJ NO. 2 relay terminal 3 - Body ground
| Always
| 10 kΩ or higher
|
C4-1 or INJ NO. 2 relay terminal 3 - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ NO. 2 RELAY - FUEL INJECTOR ASSEMBLY) |
|
|
| 5.INSPECT INJ NO. 2 RELAY |
Inspect the INJ NO. 2 relay (LandCruiser RM000003BLB03PX_01_0018.html).
| 6.CHECK HARNESS AND CONNECTOR (INJ NO. 2 RELAY - BATTERY) |
Remove the INJ NO. 2 relay from the engine room relay block.
Disconnect the cable from the negative (-) battery terminal.
Disconnect the cable from the positive (+) battery terminal.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
INJ NO. 2 relay terminal 5 - Positive battery terminal
| Always
| Below 1 Ω
|
INJ NO. 2 relay terminal 5 or Positive battery terminal - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ NO. 2 RELAY - BATTERY) |
|
|
| 7.CHECK HARNESS AND CONNECTOR (INJ NO. 2 RELAY - BODY
GROUND) |
Remove the INJ NO. 2 relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
INJ No. 2 relay terminal 1 - Body ground
| Always
| Below 1 Ω
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ NO. 2 RELAY - BODY GROUND) |
|
|
| 8.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (EFI RELAY) - INJ NO. 2 RELAY) |
Remove the INJ NO. 2 relay from the engine room relay block.
Remove the integration relay (EFI relay) from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1B-4 - INJ NO. 2 relay terminal 2
| Always
| Below 1 Ω
|
1B-4 or INJ NO. 2 relay terminal 2 - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY (EFI RELAY) - INJ NO. 2 RELAY) |
|
|
