DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

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Symptom:
P0403-EGR SOLENOID CIRCUIT NEGATIVE DEVIATION
When Monitored and Set Condition:
P0403-EGR SOLENOID CIRCUIT NEGATIVE DEVIATION
When Monitored: With the engine running.
Set Condition: The ECM detects EGR flow is less than the requested flow.
POSSIBLE CAUSES
EGR VALVE
INTERMITTENT CONDITION
CHECKING VACUUM SUPPLY
EGR SOLENOID
ENGINE CONTROL MODULE - INTERNAL
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle and monitor the DRB for ECM DTCs.
Did this DTC set again? All
Yes
→
Go To 2
No
→
Go To 5
2 Turn the ignition off.
Disconnect both vacuum lines at the EGR Solenoid.
Using a vacuum line connection tee, connect the vacuum supply line to the EGR
Solenoid Output line at the EGR Solenoid.
Disconnect the vacuum line at the EGR Valve.
Connect a vacuum gauge to the EGR Solenoid Output line at the EGR Valve.
Start the engine.
With the engine at idle, note the vacuum gauge reading.
Is the vacuum above 22 inches? All
Yes
→
Go To 3
No
→
Inspect the vacuum hoses/tubes for damage, restriction and leaks.
If o.k. refer to the Service Information to check the Vacuum Pump
operation.
Perform ROAD TEST VERIFICATION - VER-2.
87
DRIVEABILITY - DIESEL
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