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Checking Monitor Status

CHECKING MONITOR STATUS

Introduction

MONITOR RESULT refers to the monitor results of select engine components (thermostat, catalytic converter, evaporative emissions system, etc.). Various states (Test Item) of the components are monitored by the ECM. The value of the Test Items (Test Value) can be read using the hand-held tester or the generic OBD II scan tool after the vehicle has been driven to run the monitor.

However, the Test Value is the latest "Snapshot" of the vehicle's data from the last time it was driven and a monitor was run. The date is not dynamic. The Test Values are cleared when the ignition switch is turned OFF.




The Test Items are described in the table of each Inspection Procedure.
- Test ID (a code applied to each Test Item)
- Test Item
- Description of Test Value
- Unit Conversion (if necessary, multiply the Test Value displayed on the scan tool by the Unit Conversion value. The result will be the required value.)
- Unit
- Description of Test Limit (malfunction criteria for Test Item)

If the Test Value is out of the Test Limit, the Test Item is failure. If it is within Test Limit, the Test Item is normal. However, if the Test Value is on the borderline of the standard value, the Test Item may malfunction soon.

Procedure of MONITOR RESULT using hand-held tester

a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch ON.
c. Clear the DTCs.
d. Drive the vehicle according to the Monitor Drive Pattern to run the monitor of each engine component.

CAUTION: Strict observance of posted speed limits, traffic laws, and road conditions are required.

e. Enter the hand-held tester's menus: DIAGNOSIS, ENHANCED OBD II, MONITOR INFO, MONITOR RESULT.




f. The tester will display as shown in the illustration.
- The left side of the tester screen shows the status of the Test Item.
- The right side of the tester screen shows the status of the Test Item.
INCMP (incomplete): The monitor has not run yet.
PASS: The monitor has run and the Test Item is normal.
FAIL: The monitor has run and the Test Item has failed.

g. Select a Test Item (Label) and press ENTER.




h. The tester will display as shown in the illustration.
- VAL (Test Value)
- LMT (Test Limit)
- TLT (Test Limit Type): Either 0 or 1 is displayed.
TLT=0: If the Test Value is smaller than than the LMT, the Test Item is normal. If the Test Value is larger than than the LMT, the Test Item has failed. TLT=1: If the Test Value is larger than than the LMT, the Test Item is normal. If the Test Value is smaller than than the LMT, the Test Item has failed.

HINT:
- This illustration shows that the thermostat is normal.
- Test Value is recorded after the monitor runs.

i. If the Test Value is on the borderline of the standard value, the Test Item may malfunction soon.




j. If necessary, press the HELP button to see the information of the TLT.

NOTE: In rare cases, the monitor may have passed even though the DTC was set and the MIL was illuminated. The monitor may have detected the malfunction on a previous trip, and then the monitor passed on the most recent trip. This would indicate that an intermittent problem may be the cause of the DTC.
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