EGR cooler bypass control circuit low bank 1

The EGR cooler bypass flap lets exhaust gas skip the cooler when the engine is cold. The control circuit voltage is below the valid range.

• engine warning light
• usually no noticeable change
• may slow warm-up or affect emissions

1. 01Inspect the connector and wiring to the bypass solenoid or actuator.
2. 02On vacuum systems, check the vacuum hose and solenoid; on electric ones, run the actuator test.
3. 03Check the flap moves freely and is not seized with soot.
4. 04Replace the solenoid or actuator (sometimes only available with the EGR cooler).