P1140-EGR AIR FLOW CONTROL VALVE OPEN CKT
For a complete wiring diagram Refer to Section 8W
- When Monitored:
With the ignition on and the ECM EGR Air Flow Control Valve command off.
- Set Condition:
The ECM does not detect voltage on the EGR Air Flow Control Valve Control circuit.
| Possible Causes |
| INTERMITTENT CONDITION |
| ASD RELAY OUTPUT CIRCUIT OPEN |
| EGR AIR FLOW CONTROL VALVE CIRCUIT SHORTED TO GROUND |
| EGR AIR FLOW CONTROL VALVE CIRCUIT OPEN |
| EGR AIR FLOW CONTROL VALVE |
| ENGINE CONTROL MODULE |
Diagnostic Test
1. CHECK FOR ACTIVE DTCNOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the scan tool , erase ECM DTCs.
Test drive the vehicle.
Monitor the scan tool for ECM DTCs.
Did this DTC set again?
Yes
- Go To2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2. ASD OUTPUT CKT OPEN
Turn the ignition off.
Disconnect the EGR Air Flow Control Valve harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit.
Does the test light illuminate brightly?
Yes
- Go To3
No
- Repair the ASD Relay Output circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3. EGR AIR FLOW CONTROL VALVE SHORTED TO GROUND
Disconnect the ECM harness connectors.
Measure the resistance between ground and the EGR Air Flow Control Valve Control circuit.
Is the resistance above 1000 ohms?
Yes
- Go To4
No
- Repair the EGR Air Flow Control Valve circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4. EGR AIR FLOW CONTROL VALVE CIRCUIT OPEN
Measure the resistance of the EGR Air Flow Control Valve Control circuit.
Is the resistance below 10.0 ohms?
Yes
- Go To5
No
- Repair the EGR Air Flow Control Valve Control circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5. EGR AIR FLOW CONTROL VALVE
Install a substitute EGR Air Flow Control Valve in place of the vehicle's EGR Air Flow Control Valve.
NOTE: Ensure the ECM and EGR Air Flow Control Valve harness connectors are connected.
Turn the ignition on.
With the scan tool , check for this DTC to set again.
Did this DTC set again?
Yes
- Replace and program the Engine Control Module in accordance with the Service Information.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Replace the EGR Air Flow Control Valve.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).