Ecd System Ecm Power Source Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK ECM (+B VOLTAGE)
CHECK WIRE HARNESS (ECM - BODY GROUND)
CHECK ECM (IGSW VOLTAGE)
INSPECT FUSE (IGN FUSE)
INSPECT IGNITION SWITCH ASSEMBLY
CHECK ECM (MREL VOLTAGE)
INSPECT FUSE (EFI FUSE)
INSPECT INTEGRATION NO.1 RELAY (MAIN RELAY)
CHECK WIRE HARNESS (INTEGRATION RELAY (MAIN RELAY) - ECM)
ECD 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 a current to flow to the coil, closing the contacts of the MAIN relay and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- If the ECM is replaced, the new ECM needs initialization (Toyota Fortuner RM0000012X2005X.html).
Turn the ignition switch ON.
Measure the voltage of the ECM connectors.
- Standard voltage:
Tester Connection
| Specified Condition
|
E4-1 (+B) - E6-7 (E1)
| 9 to 14 V
|
| | PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
|
| 2.CHECK WIRE HARNESS (ECM - BODY GROUND) |
Disconnect the E6 ECM connector.
Measure the resistance of the wire harness side connector.
- Standard resistance:
Tester Connection
| Specified Condition
|
E6-7 (E1) - Body ground
| Below 1 Ω
|
| | REPAIR OR REPLACE HARNESS AND CONNECTOR |
|
|
| 3.CHECK ECM (IGSW VOLTAGE) |
Turn the ignition switch ON.
Measure the voltage of the ECM connectors.
- Standard voltage:
Tester Connection
| Specified Condition
|
E4-9 (IGSW) - E6-7 (E1)
| 9 to 14 V
|
| 4.INSPECT FUSE (IGN FUSE) |
Remove the IGN fuse from the instrument panel junction block.
Measure the resistance of the fuse.
- Standard resistance:
- Below 1 Ω
| | CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED TO FUSE, AND REPLACE FUSE |
|
|
| 5.INSPECT IGNITION SWITCH ASSEMBLY |
Disconnect the I9 ignition switch connector.
Measure the resistance of the ignition 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 |
|
|
| 6.CHECK ECM (MREL VOLTAGE) |
Turn the ignition switch ON.
Measure the voltage of the ECM connectors.
- Standard voltage:
Tester Connection
| Specified Condition
|
E4-8 (MREL) - E6-7 (E1)
| 9 to 14 V
|
| 7.INSPECT FUSE (EFI FUSE) |
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 HARNESS AND COMPONENTS CONNECTED TO FUSE, AND REPLACE FUSE |
|
|
| 8.INSPECT INTEGRATION NO.1 RELAY (MAIN RELAY) |
Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00JX.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 WIRE HARNESS (INTEGRATION RELAY (MAIN RELAY) - ECM) |
Disconnect the 1J integration relay connector from the engine room junction block (Toyota Fortuner RM0000014TJ00JX.html).
Disconnect the E5 ECM connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection
| Specified Condition
|
1J-4 - E5-1 (+B)
| Below 1 Ω
|
1J-4 or E5-1 (+B) - Body ground
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS AND CONNECTOR (INTEGRATION RELAY (MAIN RELAY) - ECM) |
|
|
| OK |
|
|
|
| REPAIR OR REPLACE HARNESS AND CONNECTOR (+B TERMINAL OF ECM - BATTERY POSITIVE TERMINAL) |
|
