Diagnostic Procedure
DIAGNOSTIC PROCEDURE - O2 SENSOR HEATER CIRCUIT OPEN
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Turn the ignition on. With the DRBIII®, read DTCs. Does the Good Trip Indicator display NO? Yes --> Go To 3 No --> Go To 2 |
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| 2 |
NOTE:
Allow the O2 Sensor voltage to stabilize between 0.4 and 0.6 volts before continuing the test. Turn the ignition on.With the DRBIII®, actuate the O2 Heater Relay.With the DRBIII®, monitor O2 Sensor voltage for at least 2 minutes.Does the voltage stay between 0.4 and 0.6 volts?Yes --> Go To 3No --> Go To 7 |
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| 3 |
NOTE:
Allow the O2 Sensor voltage to stabilize between 0.4 and 0.6 volts before continuing the test. Turn the ignition off.Disconnect the O2 Sensor harness connector.Measure the resistance across the O2 Sensor Heater element at the component side of the connector.
NOTE:
Heater Resistance Specification for 1/1 and 1/2 O2 Sensor is from 3 to 20 ohms. Is the O2 Sensor Heater element within specification?Yes --> Go To 4No --> Replace the O2 Sensor.Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L
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| 4 | Turn the ignition off. Disconnect the O2 Sensor harness connector. Disconnect the PCM harness connector. Measure the resistance of the O2 Sensor Heater Control circuit between the O2 Sensor harness connector and the PCM harness connector. Is the resistance below 5.0 ohms? Yes --> Go To 5 No --> Repair the O2 Sensor Heater Control circuit for an open. Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L . |
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| 5 | Turn the ignition off. Disconnect the O2 Sensor harness connector. With the DRBIII®, actuate the O2 Heater Relay. Measure the voltage of the ASD Relay Output circuit in the O2 Sensor harness connector. Is the voltage above 11.0 volts? Yes --> Go To 6 No --> Repair the ASD Relay Output circuit for an open. Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L . |
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| 6 |
NOTE:
Before Continuing: Disconnect the PCM harness connector and check the related wiring 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.RepairReplace and program the Powertrain Control Module in accordance with the Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L
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| 7 |
WARNING:
WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE:
The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRB parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set.Refer to any EXTXREF Technical Service Bulletins (TSB) that may apply.Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.Were any of the above conditions present?Yes --> Repair as necessaryPerform POWERTRAIN VERIFICATION TEST VER - 5 - 1.6L
.No --> Test Complete. |
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