P0403

(P0403) EGR CONTROL CIRCUIT





When Monitored and Set Condition
^ When Monitored: A constant engine speed between 900 and 1700 RPM and no other EGR or MAP sensor faults.
^ Set Condition: The PCM commands the EGR valve to open. The MAP sensor value must drop by a minimum of 54 mbar (1.6 inHg) when EGR is commanded open or a fault is set.

POSSIBLE CAUSES
- EGR SOLENOID CONTROL CIRCUIT OPEN
- EGR SOLENOID CONTROL CIRCUIT SHORT TO GROUND
- EGR SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE
- FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT OPEN
- EGR SOLENOID
- POWERTRAIN CONTROL MODULE



Diagnostic Test
1. CHECK FOR CURRENT DTC





Turn the ignition on. With the DRBIII, read PCM DTCs.
Is this DTC present?
Yes >> For complete diagnosis of this DTC, refer to (P0400) EGR SYSTEM PERFORMANCE. P0400
No >> Go To 2

2. INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.

Note: Check connectors - Clean/repair as necessary. Poor pin to terminal connections can set DTCs. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors specific to this DTC. Wiggle the wires while checking for shorts and open circuits.

Note: Check for any Technical Service Bulletins that may apply.

Were there any problems found?
Yes >> Repair as necessary.