TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
Measure the voltage of the EGR Sensor Signal circuit in the EGR Position Sensor
harness connector.
Is the voltage above 5.2 volts?
All
Yes → Repair the short to battery voltage in the EGR Position Sensor
Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 4
4 Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Connect a jumper wire between the EGR Position Sensor Signal circuit and the
Sensor ground circuit.
With the DRBIIIt, monitor the EGR Position Sensor voltage.
Turn the ignition on.
Is the voltage below 0.5 of a volt?
All
Yes → Replace the EGR Solenoid Assembly.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 5
5 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 EGR Position Sensor Signal 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 6
No → Repair the open in the EGR Position Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
6 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 30 ohms?
All
Yes → Go To 7
No → Repair the open in the Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
157
DRIVEABILITY - NGC
P0406 - EGR POSITION SENSOR HIGH — Continued
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