P2102-EGR AIR FLOW CONTROL VALVE CIRCUIT LOW
 |
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Exhaust Gas Recirculation (EGR) Air Flow Control Valve is an electrically operated throttle valve motor used to assist the EGR system function by creating a vacuum in the intake system to draw exhaust gas into the intake manifold. The Solenoid receives 12 Volts from the ASD relay and is controlled by the Powertrain Control Module (PCM). With the solenoid de-energized (off) the throttle valve is in the open (full flow) position. When the PCM energizes (grounds) the throttle motor, the throttle valve closes creating a low pressure (vacuum) in the intake system. This low pressure effect helps draw exhaust gases from the EGR Valve into the intake system. When this DTC is active, the EGR System and DPF regeneration is disabled.
-
When Monitored:
With the ignition on and the PCM EGR Air Flow Control Valve command off.
-
Set Condition:
The PCM detects a short ground on the EGR Air Flow Control Valve Control circuit for 0.5 second.
Possible Causes |
|---|
| (F344) ASD RELAY OUTPUT CIRCUIT OPEN/HIGH RESISTANCE |
| (K312) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO GROUND |
| (K312) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO THE (Z904) GROUND CIRCUIT |
| (Z904) GROUND CIRCUIT OPEN/HIGH RESISTANCE |
| EGR AIR FLOW CONTROL VALVE |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Turn the ignition on. |
| 2. | Using the scan tool, erase PCM DTCs. |
| 3. | Perform several ignition cycles, turning the ignition off for at least 10 seconds between each ignition cycle. |
| 4. | Monitor the scan tool for PCM DTCs. |
Did this DTC return?
Yes
- Go To 2
No
- Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK THE (Z904) GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
 |
| 1. | Turn the ignition off. |
| 2. | Disconnect the EGR Air Flow Control Valve harness connector. |
| 3. | Turn the ignition on. |
| 4. | Using a 12-volt test light connected to 12 Volts, check the (Z904) Ground circuit at the EGR Air Flow Control Valve harness connector. |
Does the test light illuminate brightly?
Yes
- Go To 3
No
- Repair the (Z904) Ground circuit for an open or high resistance.
-
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
3. CHECK THE (F344) ASD RELAY OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE
|
| 1. | Turn the ignition on. |
| 2. | Using a 12-volt test light connected to ground, check the (F344) ASD Relay Output circuit at the EGR Air Flow Control Valve harness connector. |
Does the test light illuminate brightly?
Yes
- Go To 4
No
- Repair the (F344) ASD Relay Output circuit for an open or high resistance.
-
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
4. CHECK THE (K312) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT FOR A SHORT TO GROUND
 |
| 1. | Turn the ignition off. |
| 2. | Disconnect the PCM C1 harness connector. |
| 3. | Measure the resistance between ground and the (K312) EGR Air Flow Control Valve Control circuit at the EGR Air Flow Control Valve harness connector. |
Is the resistance above 10k Ohms?
Yes
- Go To 5
No
- Repair the (k312) EGR Air Flow Control Valve Control circuit for a short to ground.
-
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
5. CHECK FOR THE (K312) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT SHORTED TO THE (Z904) GROUND CIRCUIT
 |
| 1. | Measure the resistance between the (K312) EGR Air Flow Control Valve Control circuit and the (Z904) Ground circuit at the EGR Air Flow Control Valve harness connector. |
Is the resistance above 10k Ohms?
Yes
- Go To 6
No
- Repair the (K312) EGR Air Flow Control Valve Control circuit for a short to the (Z904) Ground circuit.
-
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
| 1. | Reconnect the EGR Air Flow Control Valve harness connector. |
| 2. | Reconnect the PCM C1 harness connector. |
| 3. | Turn the ignition on. |
| 4. | Using the scan tool, erase PCM DTCs. |
| 5. | Turn the ignition off. |
| 6. | Disconnect the EGR Air Flow Control Valve harness connector. |
| 7. | Connect a jumper between the (K312) EGR Air Flow Control Valve Control circuit and the (F344) ASD Relay Output circuit. |
| 8. | Turn the ignition on. |
| 9. | Using the scan tool, view PCM DTCs. |
Did the P2103-ELECTRONIC THROTTLE CONTROL MOTOR CIRCUIT HIGH DTC set as active with the jumper in place?
Yes
- Replace the EGR Air Flow Control Valve in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace and program the Powertrain Control Module in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).