Dodge 2004 Neon SX2 Diagnostic Manual page 437

P0135-O2 SENSOR 1/1 HEATER PERFORMANCE —
TEST
2 Turn the ignition off.
NOTE: Allow the O2 Sensor to cool down before continuing the test. The O2
voltage should stabilize at 5.0 volts. Raising the hood may help in reducing
under hood temps.
Ignition on, engine not running.
With the DRBIII , actuate the O2 Heater Test.
With the DRBIII , monitor O2 Sensor voltage for at least 2 minutes.
Does the voltage stay above 4.5 volts?
Yes → Go To 3
→ Refer to the INTERMITTENT CONDITION symptom in the
No
3 NOTE: Allow the O2 sensor to cool down to room temperature.
Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance across the O2 Sensor Heater element component side.
NOTE: Heater Resistance Specification: 3 to 20 ohms for Upstream and
Downstream O2 Sensors.
Is the resistance within the specifications?
Yes → Go To 4
→ Replace the O2 Sensor.
No
4 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance between an engine ground and the O2 Heater Ground circuit
in the O2 Sensor harness connector.
Is the resistance below 0.5 of an ohm?
Yes → Go To 5
→ Repair the open/high resistance in the O2 Heater Ground circuit.
No
5 Turn the ignition off.
Disconnect the O2 Sensor 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 O2 Heater Control circuit from the O2 Sensor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 0.5 of an ohm?
Yes → Go To 6
→ Repair the open/high resistance in the O2 Heater Control circuit.
No
ACTION
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
101
Continued
APPLICABILITY
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