Main Relay Operation Check
Precautions: General safety (00)
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B2: | ECM power supply circuit | 1. | ECM |
| A1: | Main relay power supply circuit (coil side) | B3: | ECM power supply circuit | 2. | Main relay |
| A2: | Main relay power supply circuit (switch side) | C1: | ECM ground circuit | 3. | “FI” fuse (30 A) |
| A3: | Main relay drive circuit | C2: | ECM ground circuit | ||
| B1: | ECM power supply circuit | C3: | ECM ground circuit |
Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Main relay power supply circuit check
1)When ignition is “OFF”, remove main relay.
2)Check for proper terminal connection to main relay connector.
3)If connections are OK, set ignition “ON”.
4)Check that voltage between each of “A1” and “A2” circuits and ground is battery voltage.
Is check result OK?
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Go to Step 2.
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Repair or replace defective wire harness.
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| 2 |
Main relay drive circuit check
1)When ignition is “OFF”, disconnect “E01” connector from ECM.
2)Check for proper terminal connection to “E01” connector.
3)If connections are OK, check the following points.
•Resistance of “A3” circuit: less than 1 Ω
•Resistance between “A3” circuit and ground: infinity •Resistance between “A3” circuit terminal and other terminal at main relay connector: infinity •Voltage of “A3” circuit: approx. 0 V (When ignition is “ON”) Is check result OK?
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Go to Step 3.
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Repair or replace defective wire harness.
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| 3 |
ECM power supply circuit
1)Check the following points.
•Resistance of “B1”, “B2” and “B3” circuits: less than 1 Ω
•Resistance between each of “B1”, “B2” and “B3” circuits and ground: infinity •Resistance between “B1” circuit terminal and other terminal at “E01” connector: infinity •Resistance between “B2” circuit terminal and other terminal at “E01” connector: infinity •Resistance between “B3” circuit terminal and other terminal at “E01” connector: infinity •Voltage of “B1”, “B2” and “B3” circuits: approx. 0 V (When ignition is “ON”) Is check result OK?
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Go to Step 4.
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Repair or replace defective wire harness.
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| 4 |
ECM ground circuit check
1)Check the following points.
•Resistance of “C1”, “C2” and “C3” circuits: less than 1 Ω
•Resistance between each of “C1”, “C2” and “C3” circuits and ground: infinity •Resistance between “C1” circuit terminal and other terminal at “E01” connector: infinity •Resistance between “C2” circuit terminal and other terminal at “E01” connector: infinity •Resistance between “C3” circuit terminal and other terminal at “E01” connector: infinity •Voltage of “C1”, “C2” and “C3” circuits: approx. 0 V (When ignition is “ON”) Is check result OK?
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Go to Step 5.
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Repair or replace defective wire harness.
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| 5 |
Main relay check
1)Check main relay.
Is check result OK?
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End.
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Replace main relay.
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