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DRIVEABILITY - DIESEL
P0403-EGR SOLENOID CIRCUIT NEGATIVE DEVIATION —
TEST
3
NOTE: The engine must be at operating temperature for this test to be valid.
Turn the ignition off.
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 and observe the vacuum gauge reading for 1 minute.
NOTE: The vacuum reading should increase to above 18 inches approxi-
mately 5 seconds after the engine is started. The vacuum should decrease to
below 2 inches within 40 seconds of engine run time.
Did the vacuum reading increase to above 18 inches then decrease below 2 inches as
described?
Yes → Go To 4
→ Replace the EGR Solenoid.
No
4
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.
Test drive the vehicle and note the vehicles performance.
NOTE: With the connection tee in place the EGR valve will receive full
vacuum supply with the engine running. This should cause a severe
reduction in engine power.
Does the vehicle exhibit a severe loss of power?
Yes → Replace and program the Engine Control Module in accordance
→ Replace the EGR Valve.
No
5
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
Yes → Repair as necessary.
→ Test Complete.
No
ACTION
Perform ROAD TEST VERIFICATION - VER-2.
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
Perform ROAD TEST VERIFICATION - VER-2.
88
Continued
APPLICABILITY
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