| One of the following conditions is met for 1 second or more: |
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 (a) or (b) |
| (a) Step motor |
Driving |
| (b) 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 (a) or (b) |
| (a) Step motor |
Driving |
| (b) 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 (a) or (b) |
| (a) Step motor |
Driving |
| (b) EGR4 |
Not operating |