Chrysler Concorde 2004 Service Manual page 779

P0172-FUEL SYSTEM 1/1 RICH —
TEST
11 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Turn the ignition on.
Measure the voltage on the O2 Return circuit in the O2 Sensor harness connector.
Is the voltage at 2.5 volts?
Yes → NOTE: Before continuing, check the PCM harness connector
No
ACTION
terminals for corrosion, damage, or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
→ Check the O2 Return circuit for damage, short to ground, open, or
short to voltage. Inspect the O2 Sensor connector and the PCM
harness connector. If OK, replace the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
Continued
121
APPLICABILITY
All