TEST ACTION APPLICABILITY
9 Ignition on, engine not running.
Disconnect the O2 Sensor harness connector.
With the DRBIIIt, monitor the O2 Sensor voltage.
The O2 Sensor voltage should read 5.0 volts on the DRBIIIt 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?
All
Yes → Replace the O2 Sensor
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 10
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?
All
Yes → Check the O2 Signal 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.
No → Go To 11
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?
All
Yes → NOTE: Before continuing, check the PCM harness connector
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.
No → 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.
111
DRIVEABILITY - NGC
P0172-FUEL SYSTEM 1/1 RICH — Continued
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