Checking Monitor Status

The purpose of the monitor result (mode 06) is to allow access to the results for on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalysts and evaporative emissions (EVAP) systems.

The monitor result allows the OBD II scan tool to display the monitor status, test value, minimum test limit and maximum test limit. These data are displayed after the vehicle has been driven to run the monitor.

When the test value is not between the minimum and maximum test limits, the ECM (PCM) interprets this as a malfunction. If the test value is on the borderline of the test limits, the component is likely to malfunction in the near future.

Perform the following procedures to view the monitor status. Although these procedures refer to the Toyota Techstream, the monitor status can be checked using a generic OBD II scan tool. Refer to your scan tool operator's manual for specific procedural information.

PERFORM MONITOR DRIVE PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear DTCs. Refer to DTC CHECK / CLEAR .
5. Operate the vehicle in accordance with the applicable drive pattern described in Readiness Monitor Drive Pattern. Refer to READINESS MONITOR DRIVE PATTERN . Do not turn the ignition switch off.
  NOTE:
  The test results will be lost if the ignition switch is turned off.
ACCESS MONITOR RESULT
1. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Result.
2. Confirm the monitor status for each component.
  HINT:
  
  The monitor status for each component is displayed in the Result column.
  - Pass: The component is functioning normally.
  - Fail: The component is malfunctioning.
3. Display the test results and test value for a monitor by selecting the icon in the Details column for that monitor.
CHECK COMPONENT STATUS
1. Compare the Test Value with the minimum test limit (Min Limit) and maximum test limit (Max Limit).
2. If the test value is between the minimum and maximum test limits, the component is functioning normally. If not, the component is malfunctioning. The test value is usually not near the test limits. If the test value is on the borderline of the test limits, the component is likely to malfunction in the near future.
  HINT:
  
  The monitor result might on rare occasions be Pass even if the Malfunction Indicator Lamp (MIL) is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be caused by an intermittent problem.

MONITOR RESULT INFORMATION

If you use a generic scan tool, multiply the test value by the scaling value listed below.

ADVANCE / RETARDED INTAKE SIDE

Monitor ID	Test ID	Scaling	Unit	Description
$35	$81	Multiply by 0.01	Second	Forced movement of oil control valve time

ADVANCE / RETARDED EXHAUST SIDE

Monitor ID	Test ID	Scaling	Unit	Description
$35	$85	Multiply by 0.01	Second	Forced movement of oil control valve time

AIR FUEL RATIO SENSOR (SENSOR 1)

Monitor ID	Test ID	Scaling	Unit	Description
$01	$8E	Multiply by 0.001	V	Air fuel ratio sensor deterioration level
$01	$91	Multiply by 0.004	mA	Air fuel ratio sensor current

HEATED OXYGEN SENSOR (SENSOR 2)

Monitor ID	Test ID	Scaling	Unit	Description
$02	$08	Multiply by 0.001	V	Maximum sensor voltage
$02	$8B	Multiply by 0.001	Seconds	0.35 - 0.2 V sensor switch time
$02	$8D	Multiply by 0.001	Seconds	Duration that sensor voltage drops to 0.2 V during fuel-cut
$02	$8F	Multiply by 0.0003	g	Maximum oxygen storage capacity

FUEL SYSTEM

Monitor ID	Test ID	Scaling	Unit	Description
$81	$81	Multiply by 0.00003	No dimension	Monitoring method using air fuel ratio sensor
$81	$82	Multiply by 0.001	No dimension	Monitoring method using crank angle sensor

CATALYST

Monitor ID	Test ID	Scaling	Unit	Description
$21	$A9	Multiply by 0.0003	No dimension	Oxygen storage capacity of catalyst

EVAP

Monitor ID	Test ID	Scaling	Unit	Description
$3D	$C9	Multiply by 0.001	kPa	Test value for small leak (P0456)
$3D	$CA	Multiply by 0.001	kPa	Test value for gross leak (P0455)
$3D	$CB	Multiply by 0.001	kPa	Test value for leak detection pump off stuck (P2401)
$3D	$CD	Multiply by 0.001	kPa	Test value for leak detection pump on stuck (P2402)
$3D	$CE	Multiply by 0.001	kPa	Test value for vent valve off stuck (P2420)
$3D	$CF	Multiply by 0.001	kPa	Test value for vent valve on stuck (P2419)
$3D	$D0	Multiply by 0.001	kPa	Test value for reference orifice low flow (P043E)
$3D	$D1	Multiply by 0.001	kPa	Test value for reference orifice high flow (P043F)
$3D	$D4	Multiply by 0.001	kPa	Test value for purge VSV close stuck (P0441)
$3D	$D5	Multiply by 0.001	kPa	Test value for purge VSV open stuck (P0441)
$3D	$D7	Multiply by 0.001	kPa	Test value for purge flow insufficient (P0441)

MISFIRE

Monitor ID	Test ID	Scaling	Unit	Description
$A1	$0B	Multiply by 1	Time	Total EWMA* misfire count of all cylinders in last ten driving cycles
$A1	$0C	Multiply by 1	Time	When ignition switch is ON, total misfire count of all cylinders in last driving cycle is displayed. While engine is running, total misfire count of all cylinders in current driving cycle is displayed.
$A2	$0B	Multiply by 1	Time	Total EWMA* misfire count for cylinder 1 in last ten driving cycles
$A2	$0C	Multiply by 1	Time	When ignition switch is ON, total misfire count of cylinder 1 in last driving cycle is displayed. While engine is running, total misfire count of cylinder 1 in current driving cycle is displayed.
$A3	$0B	Multiply by 1	Time	Total EWMA* misfire count for cylinder 2 in last ten driving cycles
$A3	$0C	Multiply by 1	Time	When ignition switch is ON, total misfire count of cylinder 2 in last driving cycle is displayed. While engine is running, total misfire count of cylinder 2 in current driving cycle is displayed.
$A4	$0B	Multiply by 1	Time	Total EWMA* misfire count for cylinder 3 in last ten driving cycles
$A4	$0C	Multiply by 1	Time	When ignition switch is ON, total misfire count of cylinder 3 in last driving cycle is displayed. While engine is running, total misfire count of cylinder 3 in current driving cycle is displayed.
$A5	$0B	Multiply by 1	Time	Total EWMA* misfire count for cylinder 4 in last ten driving cycles
$A5	$0C	Multiply by 1	Time	When ignition switch is ON, total misfire count of cylinder 4 in last driving cycle is displayed. While engine is running, total misfire count of cylinder 4 in current driving cycle is displayed.

HINT:

*: EWMA (Exponential Weighted Moving Average) misfire counts for last 10 driving cycles (calculated)

Calculation: 0.1 x (current counts) + 0.9 x (previous average)

Initial value for (previous average) = 0