Toyota Tundra Service Manual: Checking Monitor Status

CHECKING MONITOR STATUS

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

1. PERFORM MONITOR DRIVE PATTERN

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (See page ).

(e) Operate the vehicle in accordance with the applicable drive pattern described in Readiness Monitor Drive Pattern (See page ). Do not turn the ignition switch off.

HINT:

The test results will be lost if the ignition switch is turned off.

2. ACCESS MONITOR RESULT

(a) Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Result.

(b) 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.

(c) Display the test results for a monitor by selecting the icon in the Details column for that monitor.

(d) Display the test value for an item listed under Test Results by selecting the icon in the Details column for that item.

3. CHECK COMPONENT STATUS

(a) Compare the test value with the minimum test limit (Min Limit) and maximum test limit (Max Limit).

(b) 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.

4. MONITOR RESULT INFORMATION

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

A/F Sensor (for Bank 1 Sensor 1)

Monitor ID

Test ID

Scaling

Unit

Description

$01

$93

Multiply by 0.00012

V

Rich to Lean response rate deterioration level

$01

$94

Multiply by 0.00012

V

Lean to Rich response rate deterioration level

$01

$95

Multiply by 0.001

Seconds

Rich to Lean delay level

$01

$96

Multiply by 0.001

Seconds

Lean to Rich delay level

$01

$91

Multiply by 0.004

mA

A/F sensor current

A/F Sensor (for Bank 2 Sensor 1)

Monitor ID

Test ID

Scaling

Unit

Description

$05

$93

Multiply by 0.00012

V

Rich to Lean response rate deterioration level

$05

$94

Multiply by 0.00012

V

Lean to Rich response rate deterioration level

$05

$95

Multiply by 0.001

Seconds

Rich to Lean delay level

$05

$96

Multiply by 0.001

Seconds

Lean to Rich delay level

$05

$91

Multiply by 0.004

mA

A/F sensor current

HO2 Sensor (for Bank 1 Sensor 2)

Monitor ID

Test ID

Scaling

Unit

Description

$02

$08

Multiply by 0.001

V

Maximum sensor voltage

$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

No dimension

Maximum oxygen storage capacity

$02

$90

Multiply by 0.001

No dimension

Response rate during fuel cut from rich condition (Normalization)

HO2 Sensor (for Bank 2 Sensor 2)

Monitor ID

Test ID

Scaling

Unit

Description

$06

$08

Multiply by 0.001

V

Maximum sensor voltage

$06

$8D

Multiply by 0.001

Seconds

Duration that sensor voltage drops to 0.2 V during fuel-cut

$06

$8F

Multiply by 0.0003

No dimension

Maximum oxygen storage capacity

$06

$90

Multiply by 0.001

No dimension

Response rate during fuel cut from rich condition (Normalization)

Catalyst (for Bank 1)

Monitor ID

Test ID

Scaling

Unit

Description

$21

$AF

Multiply by 0.001

No dimension

Oxygen storage capacity of catalyst bank 1 (Normalization)

Catalyst (for Bank 2)

Monitor ID

Test ID

Scaling

Unit

Description

$22

$AF

Multiply by 0.001

No dimension

Oxygen storage capacity of catalyst bank 2 (Normalization)

Exhaust Gas Recirculation System

Monitor ID

Test ID

Scaling

Unit

Description

$31

$BD

Multiply by 0.01

kPa

Delta Manifold Absolute Pressure

Advance/Retarded VVT Intake Side (for Bank 1)

Monitor ID

Test ID

Scaling

Unit

Description

$35

$81

Multiply by 0.01

Second

Forced movement of cam timing control actuator time

Advance/Retarded VVT Intake Side (for Bank 2)

Monitor ID

Test ID

Scaling

Unit

Description

$36

$81

Multiply by 0.01

Second

Forced movement of cam timing control actuator time

Advance/Retarded VVT Exhaust Side (for Bank 1)

Monitor ID

Test ID

Scaling

Unit

Description

$35

$85

Multiply by 0.01

Second

Forced movement of cam timing control actuator time

Advance/Retarded VVT Exhaust Side (for Bank 2)

Monitor ID

Test ID

Scaling

Unit

Description

$36

$85

Multiply by 0.01

Second

Forced movement of cam timing control actuator time

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 stuck OFF (P2401)

$3D

$CD

Multiply by 0.001

kPa

Test value for leak detection pump stuck ON (P2402)

$3D

$CE

Multiply by 0.001

kPa

Test value for vent valve stuck OFF (P2420)

$3D

$CF

Multiply by 0.001

kPa

Test value for vent valve stuck ON (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 stuck closed (P0441)

$3D

$D5

Multiply by 0.001

kPa

Test value for purge VSV stuck open (P0441)

$3D

$D7

Multiply by 0.001

kPa

Test value for purge flow insufficient (P0441)

Rear Oxygen Sensor Heater

Monitor ID

Test ID

Scaling

Unit

Description

$42

$91

Multiply by 0.001

Ohm

Oxygen sensor heater resistance for bank 1 sensor 2

$46

$91

Multiply by 0.001

Ohm

Oxygen sensor heater resistance for bank 2 sensor 2

Secondary Air Injection (AIR) - for Bank 1

Monitor ID

Test ID

Scaling

Unit

Description

$71

$E1

Multiply by 0.01

g/sec.

Test value of AIR insufficient

$71

$E2

Multiply by 0.01

kPa

Test value of AIR pump stuck ON

$71

$E3

Multiply by 0.01

kPa

Test value of AIR pump stuck OFF

$71

$E4

Multiply by 0.01

kPa

Test value of AIR control valve ON

$71

$E5

Multiply by 0.01

kPa

Test value of AIR control valve OFF

Secondary Air Injection (AIR) - for Bank 2

Monitor ID

Test ID

Scaling

Unit

Description

$72

$E1

Multiply by 0.01

g/sec.

Test value of AIR insufficient

$72

$E2

Multiply by 0.01

kPa

Test value of AIR pump stuck ON

$72

$E3

Multiply by 0.01

kPa

Test value of AIR pump stuck OFF

$72

$E4

Multiply by 0.01

kPa

Test value of AIR control valve ON

$72

$E5

Multiply by 0.01

kPa

Test value of AIR control valve OFF

Fuel System / A/F SENSOR DETERMINATION B1

Monitor ID

Test ID

Scaling

Unit

Description

$81

$81

Multiply by 0.00003

No dimension

Monitoring method using A/F sensor

Fuel System / A/F SENSOR DETERMINATION B2

Monitor ID

Test ID

Scaling

Unit

Description

$82

$81

Multiply by 0.00003

No dimension

Monitoring method using A/F sensor for Bank 2

Fuel System / ENGINE SPEED FLUCTUATION AVERAGE #1

Monitor ID

Test ID

Scaling

Unit

Description

$81

$85

Multiply by 0.001

No dimension

Monitoring method using crank angle sensor

Fuel System / ENGINE SPEED FLUCTUATION AVERAGE #2

Monitor ID

Test ID

Scaling

Unit

Description

$82

$86

Multiply by 0.001

No dimension

Monitoring method using crank angle sensor

Fuel System / ENGINE SPEED FLUCTUATION AVERAGE #3

Monitor ID

Test ID

Scaling

Unit

Description

$81

$87

Multiply by 0.001

No dimension

Monitoring method using crank angle sensor

Fuel System / ENGINE SPEED FLUCTUATION AVERAGE #4

Monitor ID

Test ID

Scaling

Unit

Description

$82

$88

Multiply by 0.001

No dimension

Monitoring method using crank angle sensor

Fuel System / ENGINE SPEED FLUCTUATION AVERAGE #5

Monitor ID

Test ID

Scaling

Unit

Description

$81

$89

Multiply by 0.001

No dimension

Monitoring method using crank angle sensor

Fuel System / ENGINE SPEED FLUCTUATION AVERAGE #6

Monitor ID

Test ID

Scaling

Unit

Description

$82

$8A

Multiply by 0.001

No dimension

Monitoring method using crank angle sensor

Fuel System / ENGINE SPEED FLUCTUATION AVERAGE #7

Monitor ID

Test ID

Scaling

Unit

Description

$81

$8B

Multiply by 0.001

No dimension

Monitoring method using crank angle sensor

Fuel System / ENGINE SPEED FLUCTUATION AVERAGE #8

Monitor ID

Test ID

Scaling

Unit

Description

$82

$8C

Multiply by 0.001

No dimension

Monitoring method using crank angle sensor

Misfire

Monitor ID

Test ID

Scaling

Unit

Description

$A1

$0B

Multiply by 1

Count

Total EWMA* misfire count of all cylinders in last ten driving cycles

$A1

$0C

Multiply by 1

Count

  • 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

Count

Total EWMA* misfire count of cylinder 1 in last ten driving cycles

$A2

$0C

Multiply by 1

Count

  • 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

Count

Total EWMA* misfire count of cylinder 2 in last ten driving cycles

$A3

$0C

Multiply by 1

Count

  • 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

Count

Total EWMA* misfire count of cylinder 3 in last ten driving cycles

$A4

$0C

Multiply by 1

Count

  • 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

Count

Total EWMA* misfire count of cylinder 4 in last ten driving cycles

$A5

$0C

Multiply by 1

Count

  • 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.

$A6

$0B

Multiply by 1

Count

Total EWMA* misfire count of cylinder 5 in last ten driving cycles

$A6

$0C

Multiply by 1

Count

  • When ignition switch is ON, total misfire count of cylinder 5 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 5 in current driving cycle is displayed.

$A7

$0B

Multiply by 1

Count

Total EWMA* misfire count of cylinder 6 in last ten driving cycles

$A7

$0C

Multiply by 1

Count

  • When ignition switch is ON, total misfire count of cylinder 6 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 6 in current driving cycle is displayed.

$A8

$0B

Multiply by 1

Count

Total EWMA* misfire count of cylinder 7 in last ten driving cycles

$A8

$0C

Multiply by 1

Count

  • When ignition switch is ON, total misfire count of cylinder 7 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 7 in current driving cycle is displayed.

$A9

$0B

Multiply by 1

Count

Total EWMA* misfire count of cylinder 8 in last ten driving cycles

$A9

$0C

Multiply by 1

Count

  • When ignition switch is ON, total misfire count of cylinder 8 in last driving cycle is displayed.
  • While engine is running, total misfire count of cylinder 8 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

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