Ecd System (W/ Urea Scr System) Ecm Power Source Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK TERMINAL VOLTAGE (+B, +B2 AND +B3 TERMINAL VOLTAGE)
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
CHECK TERMINAL VOLTAGE (IGSW TERMINAL VOLTAGE)
CHECK TERMINAL VOLTAGE (MREL TERMINAL VOLTAGE)
INSPECT NO. 1 INTEGRATION RELAY (EFI MAIN1)
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM)
INSPECT NO. 1 INTEGRATION RELAY (IG2)
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM)
CHECK TERMINAL VOLTAGE (NO. 1 INTEGRATION RELAY)
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)
ECD SYSTEM (w/ Urea SCR System) - ECM Power Source Circuit |
DESCRIPTION
When the engine switch is turned on (IG), the battery voltage is applied to terminal IGSW of the ECM. The MREL output signal from ECM causes a current to flow to the coil, closing the contacts of the EFI MAIN1 relay and supplying power to terminal +B, +B2 and +B3 of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AUX.html) and initialization (LandCruiser RM000000TIN08HX.html).
- Inspect the fuses of circuits related to this system before performing the following inspection procedure.
| 1.CHECK TERMINAL VOLTAGE (+B, +B2 AND +B3 TERMINAL VOLTAGE) |
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
G185-2 (+B) - C152-1 (E1)
| Engine switch on (IG)
| 11 to 14 V
|
G185-3 (+B2) - C152-1 (E1)
| Engine switch on (IG)
| 11 to 14 V
|
G185-4 (+B3) - C152-1 (E1)
| Engine switch on (IG)
| 11 to 14 V
|
Text in Illustration*a
| Component with harness connected
(ECM)
|
| 2.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::
Tester Connection
| Condition
| Specified Condition
|
C152-1 (E1) - Body ground
| Always
| Below 1 Ω
|
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK TERMINAL VOLTAGE (IGSW TERMINAL VOLTAGE) |
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
G185-18 (IGSW) - C152-1 (E1)
| Engine switch on (IG)
| 11 to 14 V
|
Text in Illustration*a
| Component with harness connected
(ECM)
|
| 4.CHECK TERMINAL VOLTAGE (MREL TERMINAL VOLTAGE) |
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
G184-14 (MREL) - C152-1 (E1)
| Engine switch on (IG)
| 11 to 14 V
|
Text in Illustration*a
| Component with harness connected
(ECM)
|
| 5.INSPECT NO. 1 INTEGRATION RELAY (EFI MAIN1) |
Inspect the No. 1 integration relay (EFI MAIN1) (LandCruiser RM00000469101AX_01_0006.html).
| | REPLACE NO. 1 INTEGRATION RELAY (EFI MAIN1) |
|
|
| 6.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM) |
Remove the No. 1 integration relay from the engine room relay block.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1K-7 - G184-14 (MREL)
| Always
| Below 1 Ω
|
1J-10 - G185-2 (+B)
| Always
| Below 1 Ω
|
1J-10 - G185-3 (+B2)
| Always
| Below 1 Ω
|
1J-10 - G185-4 (+B3)
| Always
| Below 1 Ω
|
1J-3 - Body ground
| Always
| Below 1 Ω
|
1K-7 or G184-14 (MREL) - Body ground and other terminals
| Always
| 10 kΩ or higher
|
1J-10 or G185-2 (+B) - Body ground and other terminals
| Always
| 10 kΩ or higher
|
1J-10 or G185-3 (+B2) - Body ground and other terminals
| Always
| 10 kΩ or higher
|
1J-10 or G185-4 (+B3) - Body ground and other terminals
| Always
| 10 kΩ or higher
|
Reinstall the No. 1 integration relay.
Reconnect the ECM connector.
| |
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 7.INSPECT NO. 1 INTEGRATION RELAY (IG2) |
Inspect the No. 1 integration relay (IG2 relay) (LandCruiser RM00000469101AX_01_0006.html).
| | REPLACE NO. 1 INTEGRATION RELAY (IG2) |
|
|
| 8.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM) |
Remove the No. 1 integration relay from the engine room relay block.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
1J-7 - G185-18 (IGSW)
| Always
| Below 1 Ω
|
1J-3 - Body ground
| Always
| Below 1 Ω
|
1J-7 or G185-18 (IGSW) - Body ground and other terminals
| Always
| 10 kΩ or higher
|
Reinstall the No. 1 integration relay.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 9.CHECK TERMINAL VOLTAGE (NO. 1 INTEGRATION RELAY) |
Remove the No. 1 integration relay from the engine room relay block.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Condition
| Specified Condition
|
1C-1 - Body ground
| Engine switch on (IG)
| 11 to 14 V
|
Text in Illustration*a
| Front view of wire harness connector
(to No. 1 Integration Relay)
|
Reinstall the No. 1 integration relay.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - NO. 1 INTEGRATION RELAY) |
|
|
| 10.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY) |
Disconnect the power management control ECU connector.
Remove the No. 1 integration 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
|
G50-8 (IG2D) - 1J-6
| Always
| Below 1 Ω
|
G50-8 (IG2D) or 1J-6 - Body ground and other terminals
| Always
| 10 kΩ or higher
|
Reconnect the power management control ECU connector.
Reinstall the No. 1 integration relay.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
