Reno L4-2.0L (2006)
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The H025 Heater Tests will normally run within the 2 minutes allotted in the procedure. If there is an indeterminate condition, the test may take up
to 8 minutes on some vehicles before a decision of pass or fail is made. If the test does not update within the allotted time, continue operation
within the enable conditions until the readiness status updates to YES. If the readiness status does not update to YES, it may have failed or aborted
due to the loss of enabling conditions. Extremely high ambient temperatures may prevent the H025 Heater Test from initiating.
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The readiness status does not indicate whether the test has passed or failed, only that a decision was made. When all of the diagnostics for a
specific system have run and passed, the readiness status will update to YES. If a test for a specific system has failed, the readiness status will
update to YES, indicating a determination was made, even if all of the required tests have not run. When a failure occurs, the scan tool will output
the DTC and malfunction indicator lamp (MIL) status.
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The first failure of a type B DTC does not constitute a final determination of pass or fail, and will not update the readiness status to YES. A second
trip is required, and all the conditions to run must be met in order for the test to run again. These conditions may include a partial to complete
engine cool down. The readiness status will update only when the DTC fails the second time, or all of the tests pass.
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If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the set procedure. If the test does not
run after numerous attempts and no DTC is set, review the appropriate scan tool data list and review the service information for an indication of
why the test does not complete. Some tests may abort due to changes in the conditions while the test is running. For example, changes in the
engine load, such as a cooling fan or an A/C compressor clutch turning on, may cause the test to abort.
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If a diagnostic test is difficult to run, observe the scan tool display while maintaining the necessary enable conditions until the readiness status
updates to YES.
Step Action (Detecting Condition)
1. Connect scan tool to DLC with ignition switch OFF
2. Start engine.
3. Idle vehicle for 2 minutes.
4. Check DTC by using scan tool.
BB. MY06~MY08:
Oxygen Sensor Heater
Description
The purpose of this procedure is to satisfy the enable criteria necessary in order to execute the Heated Oxygen Sensor (HO2S) Heater System
diagnostics. Ensure the vehicle meets the requirements listed in Conditions for Running before performing this test. Failure to meet the necessary
requirements may produce inaccurate test results.
Conditions for Running
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION
PROCEDURE:
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Ignition voltage > 10 volts
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Runtime > 60 seconds
Diagnostic Aids
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The H025 Heater Tests will normally run within the 2 minutes allotted in the procedure. If there is an indeterminate condition, the test may take up
to 8 minutes on some vehicles before a decision of pass or fail is made. If the test does not update within the allotted time, continue operation
within the enable conditions until the test updates to YES. If the test does not update to YES, it may have failed or aborted due to the loss of
enabling conditions. Extremely high ambient temperatures may prevent the H025 Heater Test from initiating.
>
The readiness status does not indicate whether the test has passed or failed, only that a decision was made. When all of the diagnostics for a
specific system have run and passed, the readiness status will update to YES. If a test for a specific system has failed, the readiness status will
update to YES, indicating a determination was made, even if all of the required tests have not run. When a failure occurs, the scan tool will output
the DTC and malfunction indicator lamp (MIL) status. The first failure of a type B DTC does not constitute a final determination of pass or fail,
and will not update the readiness status to YES. A second trip is required, and all the conditions to run must be met in order for the test to run
again. These conditions may include a partial to complete engine cool down. The readiness status will update only when the DTC fails the second
