DTC P0403: Exhaust Gas Recirculation Solenoid Malfunction

TECHNICAL DESCRIPTION
• The EGR solenoid power is supplied from the MFI relay (terminal 1).
• The PCM controls the EGR solenoid ground by turning the power transistor in the PCM "ON" and "OFF."
BACKGROUND
• The PCM checks current flows in the EGR solenoid drive circuit when the EGR solenoid is "ON" and "OFF."
DTC SET CONDITIONS

Check Conditions
Battery positive voltage is higher than 10 volts.

Judgment Criteria
• The EGR solenoid coil surge voltage (battery positive voltage + 2 volts) is not detected when the EGR solenoid is turned from "ON" to "OFF."
• Only one monitor during one drive cycle
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
• EGR solenoid failed.
• Open or shorted EGR solenoid circuit, or loose connector.
• PCM failed.