Dodge ZB 2005 Service Manual page 1145

DRIVEABILITY - GAS
P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW —
TEST
1 Ignition on, engine not running.
With the DRBIII , read DTCs and record the related Freeze Frame data.
With the DRBIII , actuate the O2 Heater test.
Monitor the O2 Heater Voltage for 5 minutes.
Did the voltage drop down close to zero during the Heater test?
Yes → Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
No
NOTE: Stop the actuation before continuing.
2 Turn the ignition off.
Disconnect the O2 Sensor harness connector.
Measure the resistance of the O2 Heater element at the O2 Sensor connector
(component side).
On a four O2 Sensor system the resistance value for 1/1 and 2/1 O2 Heater elements
is between 3.3 and 4.1 ohms and the 1/2 and 2/2 O2 Heater elements is between 4.0
and 5.0 ohms at 70° F(21.1°C).
NOTE: The resistance value will increase with warmer temperatures.
Is the resistance within the listed specifications?
Yes → Go To 3
No
3 Ignition on, engine not running.
With the DRBIII , actuate the O2 Heater Test.
Using a 12-volt test light connected to ground, probe the (K342) Fused ASD Relay
Output circuit at the O2 Sensor harness connector.
Did the test light illuminate brightly?
Yes → Go To 4
No
NOTE: Stop the actuation before continuing.
4 Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance of the O2 Heater Control circuit (PWM) from the O2 Sensor
to the PCM harness connector.
Is the resistance below 5.0 ohms?
Yes → Go To 5
No
5 Measure the resistance between ground and the O2 Heater Control (PWM) circuit.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the Heater Control (PWM) circuit.
No
ACTION
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 2
→ Replace the O2 Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Repair the open or short to ground in the (K342) Fused ASD Relay
Output circuit. Inspect the related fuse and repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Repair the open in the O2 Heater Control (PWM) circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 6
Continued
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APPLICABILITY
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