DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT INTEGRATION NO.1 RELAY (INTEGRATION RELAY - BODY GROUND)
INSPECT INTEGRATION NO.1 RELAY (EFI RELAY AND IG2 RELAY)
INSPECT ECM (IGSW VOLTAGE)
CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM)
CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY)
CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - INTEGRATION RELAY)
INSPECT IGNITION OR STARTER SWITCH ASSEMBLY
ECD SYSTEM (w/o DPF) - ECM Power Source Circuit
DESCRIPTION
When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil, closing the contacts of the integration relay (EFI MAIN relay) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.INSPECT INTEGRATION NO.1 RELAY (INTEGRATION RELAY - BODY GROUND) |
Remove the 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 | Always | 11 to 14 V |
Measure the voltage according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 1B-3 - Body ground | Always | Below 1 Ω |
| 1B-7 - Body ground | Always | Below 1 Ω |
Reinstall the integration relay.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 2.INSPECT INTEGRATION NO.1 RELAY (EFI RELAY AND IG2 RELAY) |
Remove the integration relay from the engine room relay block.
Inspect the EFI MAIN fuse and the IG2 MAIN fuse.
Remove the EFI MAIN fuse and IG2 MAIN fuse from the integration relay.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| EFI MAIN fuse | Always | Below 1 Ω |
| IG2 MAIN fuse | Always | Below 1 Ω |
Inspect the EFI relay and the IG2 relay.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 1C-1 - 1B-4 |
Battery voltage not applied to terminals 1B-2 and 1B-3 | 10 kΩ or higher |
| Battery voltage applied to terminals 1B-2 and 1B-3 | Below 1 Ω |
| 1C-1 - 1B-8 |
Battery voltage not applied to terminals 1B-7 and 1B-6 | 10 kΩ or higher |
| Battery voltage applied to terminals 1B-7 and 1B-6 | Below 1 Ω |
| | REPLACE INTEGRATION RELAY |
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| 3.INSPECT ECM (IGSW VOLTAGE) |
Disconnect the ECM connectors.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
for LHD| Tester Connection | Switch Condition | Specified Condition |
| A38-28 (IGSW) - C45-81 (E1) | Ignition switch ON | 11 to 14 V |
for RHD| Tester Connection | Switch Condition | Specified Condition |
| A52-28 (IGSW) - C46-81 (E1) | Ignition switch ON | 11 to 14 V |
| 4.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM) |
Check the harness and the connectors between the integration relay and the ECM.
Remove the 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 (Check for Open):
for LHD| Tester Connection | Condition | Specified Condition |
| A38-44 (MREL) - 1B-2 | Always | Below 1 Ω |
| A38-2 (+B) - 1B-4 | Always | Below 1 Ω |
for RHD| Tester Connection | Condition | Specified Condition |
| A52-44 (MREL) - 1B-2 | Always | Below 1 Ω |
| A52-2 (+B) - 1B-4 | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
for LHD| Tester Connection | Condition | Specified Condition |
| A38-44 (MREL) or 1B-2 - Body ground | Always | 10 kΩ or higher |
| A38-2 (+B) or 1B-4 - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| A52-44 (MREL) or 1B-2 - Body ground | Always | 10 kΩ or higher |
| A52-2 (+B) or 1B-4 - Body ground | Always | 10 kΩ or higher |
Reconnect the ECM connector.
Reinstall the integration relay.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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| 5.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM) |
Check the harness and the connectors between the integration relay and the ECM.
Remove the 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 (Check for Open):
for LHD| Tester Connection | Condition | Specified Condition |
| A38-28 (IGSW) - 1B-8 | Always | Below 1 Ω |
for RHD| Tester Connection | Condition | Specified Condition |
| A52-28 (IGSW) - 1B-8 | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
for LHD| Tester Connection | Condition | Specified Condition |
| A38-28 (IGSW) or 1B-8 - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| A52-28 (IGSW) or 1B-8 - Body ground | Always | 10 kΩ or higher |
Reconnect the ECM connector.
Reinstall the integration relay.
Result| Result | Proceed to |
| OK (w/ Entry and Start System) | A |
| OK (w/o Entry and Start System) | B |
| NG | C |
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| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 6.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY) |
Remove the integration relay from the engine room relay block.
Disconnect the IG2D main body ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
| E2-11 (IG2D) - 1B-6 | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
| Tester Connection | Condition | Specified Condition |
| E2-11 (IG2D) or 1B-6 - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
| |
| CHECK ENTRY AND START SYSTEM |
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| 7.CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - INTEGRATION RELAY) |
Remove the integration relay from the engine room relay block.
Disconnect the Ignition or Starter Switch Assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
| E93-6 (IG2) - 1B-6 | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
| Tester Connection | Condition | Specified Condition |
| E93-6 (IG2) or 1B-6 - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 8.INSPECT IGNITION OR STARTER SWITCH ASSEMBLY |
Inspect the Ignition or Starter Switch Assembly ().
| | REPLACE IGNITION OR STARTER SWITCH ASSEMBLY |
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| OK | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY) |
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