Dodge 2004 Neon SX2 Diagnostic Manual page 447

P0172-FUEL SYSTEM 1/1 RICH —
TEST
9 Ignition on, engine not running.
Disconnect the O2 Sensor harness connector.
With the DRBIII , monitor the O2 Sensor voltage.
The O2 Sensor voltage should read 5.0 volts on the DRBIII with the connector
disconnected.
Using a jumper wire, jump from the O2 Signal circuit to the O2 Return circuit in the
O2 Sensor harness connector.
NOTE: The voltage should drop from 5.0 volts down to 2.5 volts with the
jumper wire connected.
Did the O2 Sensor voltage drop from 5 volts to 2.5 volts?
Yes → Replace the O2 Sensor
No
10 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Turn the ignition on.
Measure the voltage of the O2 Signal circuit in the O2 Sensor harness connector.
Is the voltage above 4.8 volts?
Yes → Check the O2 Signal circuit for damage, short to ground, open, or
No
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
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
→ Go To 10
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.
→ Go To 11
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
111
APPLICABILITY
All
All
All