Dodge Dakota (ND). Manual — part 665
P0159-O2 SENSOR 2/2 SLOW RESPONSE (CONTINUED)
3.
(K243) O2 2/2 SIGNAL CIRCUIT
Turn the ignition off
Disconnect the 2/2 O2 Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (K243) O2 2/2 Signal circuit in the O2
Sensor harness connector.
Is the voltage approximately 5.0 volts?
Yes
>> Go To 4
No
>> Check the (K243) O2 2/2 Signal circuit for a short to
ground, open, or short to voltage. If OK, replace and pro-
gram the Powertrain Control Module per Service Informa-
tion.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
4.
(K904) O2 RETURN DOWNSTREAM CIRCUIT
Measure the voltage on the (K904) O2 Return Downstream circuit in
the O2 Sensor harness connector.
Is the voltage at 2.5 volts?
Yes
>> Go To 5
No
>> Check the (K904) O2 Return Downstream circuit for a
short to ground, open, or short to voltage. If OK, replace
and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
5.
O2 SENSOR
If there are no possible causes remaining, view repair.
Repair
Replace the O2 Sensor
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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P0161-O2 SENSOR 2/2 HEATER PERFORMANCE
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 199
P0161-O2 SENSOR 2/2 HEATER PERFORMANCE (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
This diagnostic provides a continuous check of the O2 heater circuit during operation. The heater circuit is momen-
tarily disabled to allow a resistance measurement to be taken to infer heater temperature. The current delivery to
the heater is duty cycled to maintain a specific target temperature. The error from the target temperature is contin-
uously monitored to assess heater performance.
•
When Monitored:
Engine running and heater duty cycle greater than 0%. Battery voltage greater than 11.0 volts.
•
Set Condition:
No sensor output is received when the PCM powers up the sensor heater. Two trip fault. Three good trips to
turn off the MIL.
Possible Causes
(K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN
(Z922) O2 2/2 HEATER GROUND CIRCUIT OPEN
O2 SENSOR HEATER ELEMENT
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING.
Diagnostic Test
1.
O2 SENSOR HEATER OPERATION
Turn the ignition off.
NOTE: Wait a minimum of 8 minutes to allow the O2 Sensor to cool down before continuing the test. Allow
the O2 Sensor voltage to stabilize between 4.6 and 5.0 volts.
Ignition on, engine not running.
With a scan tool, actuate the O2 Heater Test.
With a scan tool, monitor 2/2 O2 Sensor voltage for at least 2 minutes.
Does the voltage stay above 4.5 volts?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 200
ENGINE ELECTRICAL DIAGNOSTICS
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P0161-O2 SENSOR 2/2 HEATER PERFORMANCE (CONTINUED)
2.
O2 SENSOR HEATER ELEMENT
Turn the ignition off.
NOTE: Allow the O2 sensor to cool down to room temperature.
Disconnect the O2 Sensor harness connector.
Measure the resistance of the 2/2 O2 Heater Element, between the O2 Heater Control terminal and the O2 Heater
ground terminal in the O2 Sensor connector.
NOTE: O2 Heater Element resistance values should be measured at 70°F (21.1°C). The resistance value will
vary with different temperature values.
Is the resistance of the O2 Sensor Heater Element between 2.0 and 30.0 ohms?
Yes
>> Go To 3
No
>> Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
3.
(K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN
Disconnect the PCM harness connectors.
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (K399) O2 2/2 Heater Control circuit
from the O2 harness connector to the appropriate terminal of special
tool #8815.
Is the resistance below 0.5 of an ohm?
Yes
>> Go To 4
No
>> Repair the excessive resistance in the (K399) O2 2/2
Heater Control circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 201
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