| One of the following conditions is met |
Conditions A, B, C or D |
| A. All of the conditions are met |
Conditions 1 and 2 |
| 1. EGR1 output terminal voltage |
Low voltage |
| 2. Either of the following conditions is met |
Condition (a) or (b) |
| (a) Step motor |
Driving |
| (b) EGR1 |
Not operating |
| B. All of the following conditions are met |
Conditions 1 and 2 |
| 1. EGR2 output terminal voltage |
Low voltage |
| 2. Either of the following conditions is met |
Condition (c) or (d) |
| (c) Step motor |
Driving |
| (d) EGR2 |
Not operating |
| C. All of the following conditions are met |
Conditions 1 and 2 |
| 1. EGR3 output terminal voltage |
Low voltage |
| 2. Either of the following conditions is met |
Condition (e) or (f) |
| (e) Step motor |
Driving |
| (f) EGR3 |
Not operating |
| D. All of the following conditions are met |
Conditions 1 and 2 |
| 1. EGR4 output terminal voltage |
Low voltage |
| 2. Either of the following conditions is met |
Condition (g) or (h) |
| (g) Step motor |
Driving |
| (h) EGR4 |
Not operating |