DTC P1409: EGR System: Condition

Open or short circuit in EGR valve is detected. Possible causes are:

• EGR valve coil.
• EGR valve control signal open circuit.
• EGR valve control signal short circuit.

1. Inspect Connector Condition
   
   Disconnect and inspect condition of connector. Repair as needed and repeat QUICK TEST. See TESTS W/CODES - INTRODUCTION article. If connector is okay, go to next step.
2. Check EGR Valve VPWR Circuit
   
   Turn ignition off. Disconnect EGR valve connector. Turn ignition on. Measure voltage between VPWR terminal on EGR valve harness connector and negative battery terminal. If voltage is 10.5 volts or less, repair open VPWR circuit. If voltage is greater than 10.5 volts, go to next step.
3. Check EGR Valve Control Signal Circuit For Short To Ground
   
   Ensure EGR valve connector is disconnected. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Measure resistance between test pins No. 46, 56, 68, 72 and negative battery terminal. If resistance is greater than 10 k/ohms for all circuits, go to next step. If resistance is 10 k/ohms or less for any circuit, inspect and repair suspect short circuit and repeat QUICK TEST. See TESTS W/CODES - INTRODUCTION article.
4. Check Continuity Of EGR Valve Control Circuits
   
   Ensure EGR valve and PCM connectors are disconnected. Install Breakout Box (014-00950). Measure resistance between specified breakout box test pins and EGR valve harness connector terminals. See EGR VALVE-TO-PCM CIRCUIT IDENTIFICATION table. If resistance is less than 5 ohms for all circuits, replace EGR valve and repeat QUICK TEST. See TESTS W/CODES - INTRODUCTION article. If resistance is 5 ohms or greater on any circuit, inspect and repair suspect circuit. Repeat QUICK TEST. See TESTS W/CODES - INTRODUCTION article.