TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the 5 volt supply circuit from the EGR Solenoid harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes → Go To 4
No → Repair the high resistance in the 5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
4 Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the EGR Sensor Signal circuit in the EGR Solenoid
harness connector to ground.
Is the resistance below 5.0 ohms?
All
Yes → Repair the short to ground in the EGR Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Replace the EGR Assembly.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
5 Turn the ignition on.
With the DRBIIIt, actuate the EGR Solenoid.
Allow the EGR Solenoid to actuate for least 15 seconds.
Feel the EGR solenoid for operation.
Stop actuation.
Does EGR Solenoid operate during actuation test and then turn off when actuation
test was stopped?
All
Yes → Go To 6
No → Refer to the Driveability category and perform P0403 - EGR
Control Circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
150
DRIVEABILITY - NGC
P0404 - EGR POSITION SENSOR PERFORMANCE — Continued
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