P0487-EGR AIRFLOW THROTTLE CONTROL CIRCUIT A OPEN
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the engine running and the EGR Airflow Control Valve Motor command off.
- Set Condition:
The Engine Control Module (ECM) detects an open or shorted (K601) EGR Airflow Control Valve Control circuit for 0.5 second.
| Possible Causes |
| INTERMITTENT DTC |
| (K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE |
| (K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO GROUND |
| (K604) EGR AIRFLOW CONTROL VALVE SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE |
| (K604) EGR AIRFLOW CONTROL VALVE SIGNAL CIRCUIT SHORTED TO GROUND |
| (K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO VOLTAGE |
| EGR AIRFLOW CONTROL VALVE |
| ENGINE CONTROL MODULE (ECM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Diagnostic Test
1.DTC IS ACTIVEIs the status Active for this DTC?
Yes
- Go To 2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2.(K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
Is the resistance below 10.0 ohms?
Yes
- Go to 6
No
- Repair the (K601) EGR Airflow Control Valve Control circuit for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
3.(K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO GROUND
Is the resistance below above 1000 ohms?
Yes
- Go to 4
No
- Repair the (K601) EGR Airflow Control Valve Control circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
4.(K604) EGR AIRFLOW CONTROL VALVE SIGNAL CIRCUIT SHORTED TO GROUND
Is the resistance above 1000 ohms?
Yes
- Go to 5
No
- Repair the (K604) EGR Airflow Control Valve Signal circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
5.(K604) EGR AIRFLOW CONTROL VALVE SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
Is the resistance below 10.0 ohms?
Yes
- Go to 6
No
- Repair the (K604) EGR Airflow Control Valve Signal for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
6.(K601) EGR AIRFLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO VOLTAGE
Is the voltage above 1.0 volt?
Yes
- Repair the (K601) EGR Airflow Control Valve Control circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
- Go to7
7.EGR AIRFLOW CONTROL VALVE
Is the status Active for this DTC?
Yes
- Go to 8
No
- Test complete.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
8.ENGINE CONTROL MODULE (ECM)
Were any problems found?
Yes
- Repair as necessary.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
- Replace the Engine Control Module (ECM) in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)