Dodge ZB 2005 Service Manual page 1189

DRIVEABILITY - GAS
P0135-O2 SENSOR 1/1 HEATER FAILURE —
TEST
4 Turn the ignition off.
Disconnect the PCM harness connectors.
Remove the O2 Heater Relay, if it applies to the O2 Sensor being tested.
* Measure the resistance of the O2 Heater Control circuit (PWM) from the O2 Sensor
to the PCM harness connector if it applies to the O2 Sensor being tested.
OR
* Measure the resistance of the (K512) O2 Heater Relay Control circuit from the O2
Heater Relay to the PCM harness connector, if it applies to the O2 Sensor being
tested.
Is the resistance below 5.0 ohms?
Yes → Go To 5
→ Repair the excessive resistance in the O2 Heater Control circuit.
No
5 NOTE: Before beginning this test, verify what type of Heated O2 Sensor is
being tested, either the PWM Heated O2 Sensor or the Heater Relay
controlled Heated O2 Sensor.
* Measure the resistance between ground and the O2 Heater Control (PWM) circuit
if it applies to the O2 Sensor being tested.
OR
* Measure the resistance between ground and the (K512) O2 Heater Relay Control
circuit at the PCM harness connector.
Is the resistance below 100 ohms?
Yes → Repair the short to ground in the O2 Heater Control circuit.
→ Go To 6
No
6 NOTE: If the O2 Sensor being tested does not use an O2 Heater Relay to
supply voltage to the O2 Sensor Heater, answer YES to this test and
continue.
Using a 12-volt test light connected to 12-volts, probe the (Z1) O2 Heater Ground
circuit.
Does the test light illuminate brightly?
Yes → Go To 7
→ Repair the open in the (Z1) O2 Sensor Heater ground circuit.
No
7 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
Repair
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Continued
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APPLICABILITY
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