Main Relay Circuit Diagnosis Non European Emissions
Circuit Description
When the ignition is turned ON or to the START position, the main relay is energized. The main relay then supplies voltage to the engine fuse box fuse EF24 and the engine fuse box fuse EF27. The direct ignition system ignition coil, the fuel pump relay, coil side. The fuel injectors are supplied voltage through the engine fuse box fuse EF24.
Diagnostic Aids
| • | An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation. |
| • | A faulty main relay will cause a no start condition. There will be no voltage supplied to the direct ignition system ignition coil, the fuel pump relay, coil side, or the fuel injectors. Without voltage supplied to these components, they will not operate. |
Step | Action | Yes | No |
|---|---|---|---|
1 |
Is the test light ON at both terminals? | System OK | Go to Step 2 |
2 | Inspect the test light. Is the test light ON at only one terminal? | Go to Step 9 | Go to Step 3 |
3 | Inspect the test light. Is the test light OFF at both terminals? | Go to Step 4 | -- |
4 |
Is the fuse OK? | Go to Step 5 | Go to Step 10 |
5 |
Is the test light ON? | Go to Step 6 | Go to Step 11 |
6 | Connect a test light between the main relay connector terminal 86 and battery voltage. Is the test light ON? | Go to Step 7 | Go to Step 12 |
7 | Connect a test light between the main relay connector terminal 87 and ground. Is the test light ON? | Go to Step 8 | Go to Step 13 |
8 | Inspect for an open in the wiring between the main relay connector terminal 30 and the engine fuse block terminals for fuses EF24 and EF27. Is the problem found? | Go to Step 9 | Go to Step 14 |
9 | Repair the open in the wiring between the main relay connector terminal 30 and the engine fuse block terminals for fuses EF24 and/or EF27. Is the repair complete? | System OK | -- |
10 | Replace the instrument panel fuse block fuse F3. Is the repair complete? | System OK | -- |
11 | Repair the open in the wiring between the main relay connector terminal 85 and the ignition switch. Is the repair complete? | System OK | -- |
12 | Repair the open in the wiring between the main relay connector terminal 86 and ground. Is the repair complete? | System OK | -- |
13 | Repair the open in the wiring between the main relay connector terminal 87 and the battery. Is the repair complete? | System OK | -- |
14 | Replace the main relay. Is the repair complete? | System OK | -- |
Main Relay Circuit Diagnosis European Emissions
Circuit Description
When the ignition is turned ON or to the START position, the ignition 1 relay is energized. The ignition 1 relay then supplies voltage to the engine fuse block fuse Ef24 and Ef27. The electronic ignition (EI) system ignition coil, the evaporative emission (EVAP) canister purge solenoid, and the heated oxygen sensor (HO2S) are supplied voltage through the engine fuse block fuse Ef27. The fuel injectors are supplied voltage through the engine fuse block fuse Ef24.
Diagnostic Aids
| • | An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation. |
| • | A faulty ignition 1 relay will cause a no start condition. There will be no voltage supplied to the EI system ignition coil, or the fuel injectors. Without voltage supplied to these components, they will not operate. |
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 |
Is the light ON at both terminals? | -- | System OK | Go to Step 2 | ||||
2 | Is the light ON at only 1 terminal? | -- | Go to Step 3 | Go to Step 4 | ||||
3 | Repair the open in the wiring between the main relay connector terminal 30 and the fuse Ef27 or Ef24 as needed. Is the repair complete? | -- | System OK | -- | ||||
4 |
Is the light ON at both terminals? | -- | Go to Step 8 | Go to Step 5 | ||||
5 |
Is the fuse open? | -- | Go to Step 6 | Go to Step 7 | ||||
6 |
Is the repair complete? | -- | System OK | -- | ||||
7 | Repair the open circuit between terminal 86 of the main relay and fuse F3. Is the repair complete? | -- | System OK | Go to Step 8 | ||||
8 |
Is the resistance within the specified value? | 0 ohms | Go to Step 10 | Go to Step 9 | ||||
9 | Repair the open circuit. Is the repair complete? | -- | System OK | -- | ||||
10 | Replace the main relay. Is the repair complete? | -- | System OK | -- |
