Chrysler Pacifica CS 2004 Service Manual page 97

P0131-O2 SENSOR 1/1 VOLTAGE LOW —
TEST
5 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the O2 Signal circuit in the O2 Sensor
harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the O2 Signal circuit.
→ Go To 6
No
6 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the O2 Signal circuit and the O2 Return circuit in
the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes → Repair the O2 Return circuit shorted to the O2 Signal circuit.
→ Go To 7
No
7 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the O2 Signal circuit and the Heater ground circuit
in the O2 Sensor harness connector.
Is the resistance below 100 ohms?
Yes → Repair the Heater Ground circuit shorted to the O2 Signal circuit.
→ Go To 8
No
8 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.
Repair
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
Continued
91
APPLICABILITY
All
All
All
All