EGR Control Solenoid Valve
- Start engine, and bring to full operating temperature. Disconnect vacuum hose from EGR valve, and connect a vacuum gauge. If vacuum does not exist, go to step 3). If vacuum is present, disconnect 4-pin connector from control box, and recheck.
- If vacuum is no longer present, inspect for a short to ground (in Pink wire for Accord, Orange/Blue wire for Civic or Red wire for Prelude) between EGR control solenoid valve and ECU terminal A11. See Fig 1. If wire is okay, check for faulty ECU. If vacuum is still present, check vacuum hose routing of EGR system. If hoses are routed properly, replace EGR control solenoid valve.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
- On Accord, disconnect 4-pin harness connector at control box. On all others, disconnect 2-pin harness connector at control box. On all models, use jumper wires to connect battery voltage to positive terminal of control box connector. See Fig 2. While observing vacuum gauge, ground terminal B of harness connector. If within one second vacuum gauge does not read approximately 8 in. Hg, go to next step. If specified vacuum reading exists, solenoid valve is okay.
- Turn off ignition. Check vacuum hoses to solenoid valve for improper routing, bad connections, leaks and restrictions. If hoses are okay, disconnect lower hose on EGR control solenoid valve, and connect a vacuum gauge to hose. Start engine, and allow to idle.
- If vacuum gauge reads 6-10 in. Hg, replace EGR control solenoid valve. If specified vacuum does not register on gauge, replace CVC valve.
Courtesy of AMERICAN HONDA MOTOR CO., INC.