| One of the following conditions is met |
Conditions A, B, C or D |
| A. All of the following conditions are met |
Conditions 1 and 2 |
| 1. EGR1 output terminal voltage level |
Low |
| 2. Either of the following conditions is met |
Condition (a) or (b) |
| (a) Step motor |
Driving |
| (b) Command to step motor phase 1 |
Off |
| B. All of the following conditions are met |
Conditions 1 and 2 |
| 1. EGR2 output terminal voltage level |
Low |
| 2. Either of the following conditions is met |
Condition (a) or (b) |
| (a) Step motor |
Driving |
| (b) Command to step motor phase 2 |
Off |
| C. All of the following conditions are met |
Conditions 1 and 2 |
| 1. EGR3 output terminal voltage level |
Low |
| 2. Either of the following conditions is met |
Condition (a) or (b) |
| (a) Step motor |
Driving |
| (b) Command to step motor phase 3 |
Off |
| D. All of the following conditions are met |
Conditions 1 and 2 |
| 1. EGR4 output terminal voltage level |
Low |
| 2. Either of the following conditions is met |
Condition (a) or (b) |
| (a) Step motor |
Driving |
| (b) Command to step motor phase 4 |
Off |