DTC P0489 / P0490
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detection condition | Trouble area |
|---|---|
|
P0489: Exhaust Gas Recirculation “A” Control Circuit Low Any of the following conditions is met.
•EGR-1 valve (+) drive circuit is open. (3 D/C detection logic)•EGR-1 valve (+) drive circuit is overload. |
•EGR-1 valve and/or its circuit
•ECM |
|
P0490: Exhaust Gas Recirculation “A” Control Circuit High Any of the following conditions is met.
•EGR-1 valve (–) drive circuit is open. (3 D/C detection logic)•EGR-1 valve (–) drive circuit is shorted to power supply. •EGR-1 valve (–) drive circuit is overload. |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | B1: | EGR-1 valve position sensor power supply circuit | 1. | ECM |
| A1: | EGR-1 valve (+) drive circuit | B2: | EGR-1 valve position sensor signal circuit | 2. | EGR-1 valve motor |
| A2: | EGR-1 valve (–) drive circuit | B3: | EGR-1 valve position sensor ground circuit | 3. | EGR-1 valve position sensor |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
EGR-1 valve (+) drive circuit and (–) drive circuit check
1)Check “A1” and “A2” circuits according to Step 2 of EGR-1 Valve Operation Check:D16AA.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
EGR-1 valve check
1)Check EGR-1 valve.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Replace EGR-1 valve.
|