DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT INTEGRATION RELAY (INTEGRATION RELAY - BODY GROUND)
INSPECT INTEGRATION RELAY (EFI AND IG2 RELAY)
CHECK HARNESS AND CONNECTOR (+B, +B2 AND MREL CIRCUIT)
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
INSPECT ECM (IGSW VOLTAGE)
CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM, INTEGRATION RELAY - BODY GROUND)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ENGINE ROOM RELAY BLOCK)
CHECK ENTRY AND START SYSTEM (POWER SOURCE MODE DOES NOT CHANGE)
SFI SYSTEM - ECM Power Source Circuit
DESCRIPTION
When the engine switch is turned on (IG), battery voltage is applied to the IGSW of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI) and supplying power to either terminal +B or +B2 of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.INSPECT INTEGRATION 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 |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 2.INSPECT INTEGRATION RELAY (EFI AND IG2 RELAY) |
Remove the 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 |
| 1C-1 - 1B-4 |
Battery voltage is not applied to terminals 1B-2 and 1B-3 | 10 kΩ or higher |
| Battery voltage is applied to terminals 1B-2 and 1B-3 | Below 1 Ω |
| 1C-1 - 1B-8 |
Battery voltage is not applied to terminals 1B-7 and 1B-6 | 10 kΩ or higher |
| Battery voltage is applied to terminals 1B-7 and 1B-6 | Below 1 Ω |
| | REPLACE INTEGRATION RELAY |
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| 3.CHECK HARNESS AND CONNECTOR (+B, +B2 AND MREL CIRCUIT) |
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:
| Tester Connection | Condition | Specified Condition |
| A38-34 (MREL) - 1B-2 | Always | Below 1 Ω |
| A38-3 (+B) - 1B-4 | Always | Below 1 Ω |
| A38-2 (+B2) - 1B-4 | Always | Below 1 Ω |
| A38-34 (MREL) or 1B-2 - Body ground | Always | 10 kΩ or higher |
| A38-3 (+B) or 1B-4 - Body ground | Always | 10 kΩ or higher |
| A38-2 (+B2) or 1B-4 - Body ground | Always | 10 kΩ or higher |
Check the harness and connectors between the integration relay and body ground.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 1B-3 - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 4.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 |
| C45-81 (E1) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 5.INSPECT ECM (IGSW VOLTAGE) |
Disconnect the ECM connectors.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| A38-28 (IGSW) - C45-81 (E1) | Engine switch on (IG) | 11 to 14 V |
| 6.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECM, INTEGRATION RELAY - BODY GROUND) |
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:
| Tester Connection | Condition | Specified Condition |
| 1B-8 - A38-28 (IGSW) | Always | Below 1 Ω |
| 1B-8 or A38-28 (IGSW) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 7.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ENGINE ROOM RELAY BLOCK) |
Remove the integration relay from the engine room relay block.
Disconnect the E2 main body ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E2-11 (IG2D) - 1B-6 | Always | Below 1 Ω |
| E2-11 (IG2D) or 1B-6 - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 8.CHECK ENTRY AND START SYSTEM (POWER SOURCE MODE DOES NOT CHANGE) |
Check the entry and start system ().
| | REPAIR ENTRY AND START SYSTEM |
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