Chrysler 300M 2002 Service Manual page 2459

DRIVEABILITY - NGC
P0030-O2 SENSOR 1/1 HEATER CIRCUIT —
TEST
5 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance between and engine ground and the O2 Sensor Heater
ground circuit in the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes → Replace the O2 Sensor.
→ Repair the open in the O2 Sensor Heater ground circuit.
No
6 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the O2 Sensor Heater Control circuit at the O2 Sensor
harness connector.
Does the voltmeter indicate any voltage present?
Yes → Repair the short to voltage in the O2 Sensor Heater Control
→ Go To 7
No
7 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 02 Sensor Heater Control circuit from the O2 Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 8
→ Repair the open in the O2 Heater Control circuit.
No
8 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the O2 Sensor Heater Control circuit in
the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes → Repair the short to ground in the O2 Sensor Heater Control
→ Go To 9
No
9 If there are no possible causes remaining, view repair.
Repair
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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