TEST ACTION APPLICABILITY
6 NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
NOTE: Closely inspect the EGR tube(s) for obstructions, damage and holes.
Also, inspect the gasket(s) for leaks.
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.
With the engine running at normal operating temperature, monitor the DRBIIIt
parameters related to the DTC while wiggling the wire harness. Look for parameter
values to change and/or a DTC to set.
Review the DRBIIIt Freeze Frame information. 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 wire harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes → Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Test Complete.
7 Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
Measure the voltage of the EGR Sensor Signal circuit at the EGR Solenoid harness
connector.
Is the voltage above 4.30 volts?
All
Yes → Go To 8
No → Go To 9
8 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 Sensor Ground circuit from the EGR Solenoid harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes → Replace the EGR Assembly.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Repair the open in the Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
151
DRIVEABILITY - NGC
P0404 - EGR POSITION SENSOR PERFORMANCE — Continued
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