Sfi System Ecm Power Source Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK ECM (+B VOLTAGE)
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
CHECK ECM (IGSW VOLTAGE)
INSPECT FUSE (IGN)
INSPECT IGNITION SWITCH ASSEMBLY
CHECK ECM (MREL VOLTAGE)
INSPECT FUSE (EFI)
CHECK INTEGRATION NO.1 RELAY (MAIN RELAY)
CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (MAIN RELAY) - ECM, BODY GROUND)
SFI SYSTEM - ECM Power Source Circuit |
DESCRIPTION
When the ignition switch is turned ON, the battery voltage is applied to terminal IGSW of the ECM. The ECM "MREL" output signal causes current to flow to the MAIN relay coil, closing the contacts of the MAIN relay and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
Turn the ignition switch ON.
Measure the voltage of the ECM connectors.
- Standard voltage:
Tester Connection
| Specified Condition
|
E8-1 (+B) - E11-3 (E1)
| 9 to 14 V
|
| | PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
| 2.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) |
Disconnect the E11 ECM connector.
Measure the resistance of the wire harness side connector.
- Standard resistance:
Tester Connection
| Specified Condition
|
E11-3 (E1) - Body ground
| Below 1 Ω
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK ECM (IGSW VOLTAGE) |
Turn the ignition switch ON.
Measure the voltage of the ECM connectors.
- Standard voltage:
Tester Connection
| Specified Condition
|
E8-9 (IGSW) - E11-3 (E1)
| 9 to 14 V
|
Remove the IGN fuse from the instrument panel junction block.
Measure the resistance of the fuse.
- Standard:
- Below 1 Ω
| | CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE |
|
|
| 5.INSPECT IGNITION SWITCH ASSEMBLY |
Disconnect the I8 ignition switch connector.
Measure the resistance of the switch.
- Standard resistance:
Tester Connection
| Switch Condition
| Specified Condition
|
5 (AM2) - 6 (IG2)
| LOCK
| 10 kΩ or higher
|
5 (AM2) - 6 (IG2)
| ON
| Below 1 Ω
|
| | REPLACE IGNITION SWITCH ASSEMBLY |
|
|
| OK |
|
|
|
| REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM) |
|
| 6.CHECK ECM (MREL VOLTAGE) |
Turn the ignition switch ON.
Measure the voltage of the ECM connectors.
- Standard voltage:
Tester Connection
| Specified Condition
|
E8-8 (MREL) - E11-3 (E1)
| 9 to 14 V
|
Remove the EFI fuse from the engine room junction block.
Measure the resistance of the fuse.
- Standard resistance:
- Below 1 Ω
| | CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE |
|
|
| 8.CHECK INTEGRATION NO.1 RELAY (MAIN RELAY) |
Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).
Measure the voltage of the MAIN relay.
- Standard voltage:
Tester Connection
| Condition
| Specified Condition
|
1J-4 - Body ground
| Ignition switch ON
| 10 to 14 V
|
| | REPLACE INTEGRATION NO.1 RELAY |
|
|
| 9.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (MAIN RELAY) - ECM, BODY GROUND) |
Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).
Disconnect the 1J integration relay connector.
Disconnect the E8 ECM connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection
| Specified Condition
|
1J-2 - E8-8 (MREL)
| Below 1 Ω
|
1J-4 - E8-1 (+B)
| Below 1 Ω
|
1J-3 - Body ground
| Below 1 Ω
|
1J-2 or E8-8 (MREL) - Body ground
| 10 kΩ or higher
|
1J-4 or E8-1 (+B) - Body ground
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK |
|
|
|
| REPAIR OR REPLACE HARNESS OR CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL) |
|
