P0405

Diagnostic Chart:

Schematic:

The Exhaust Gas Recirculation (EGR) valve consists of a pintle valve which moves by the use of an internal solenoid and an internal position sensor (potentiometer) used to determine pintle valve position. The PCM controls the solenoid by supplying it ignition voltage whenever exhaust gas needs to be recirculated into the intake manifold. The PCM monitors the EGR solenoid and position sensor circuits for correct voltage levels at certain times. DTC P0405 sets when the EGR sensor signal voltage is below the calibrated voltage value.

DTC PARAMETERS
DTC P0405 will set if EGR sensor voltage is less than 0.35 volts when:
^ Condition exist for longer than 5 seconds
^ Ignition voltage is greater than 11 volts

EGR is disabled for the entire ignition cycle if DTC P0405 fails within that ignition cycle.

PCM may command EGR solenoid On at any ECT regardless of loop status.

DTC P0405 diagnostic runs continuously with ignition On and battery voltage over 11 volts.

DTC P0405 is a type B DTC.

DIAGNOSTIC AIDS
To locate an intermittent problem, use Scan tool to monitor EGR SENSOR voltage with ignition On, engine Off. Wiggling wires while watching for a change in EGR SENSOR voltage may locate the area where an open or short to ground in the wiring could lie.

Normal closed position values from the EGR sensor should never be less than the calibrated value listed under DTC parameters.