Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 27 (ENGINE CONTROL SYSTEM (2UZ-FE) - DIAGNOSTIC INTRODUCTION)SFI SYSTEMCHECKING MONITOR STATUS
2009 Toyota Sequoia Limited, 5.7 Y, RWD
Checking Monitor Status
2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Checking Monitor Status
WARNING: This page is about a different variant/trim than selected.
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) and thermostats.
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 tester, 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
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream ON.
- Clear the DTCs (See DTC CHECK/CLEAR ).
- Run the vehicle in accordance with the applicable drive pattern described in Readiness Monitor Drive Pattern (See READINESS MONITOR DRIVE PATTERN
). Do not turn the ignition switch off.
HINT:
The test results will be lost if the ignition switch is turned off.
- ACCESS MONITOR RESULT
- Enter the following menus using the Techstream: Powertrain/Engine/Monitor/Result. The monitor status appears after the component name.
- PASS: The component is functioning normally.
- FAIL: The component is malfunctioning.
- Confirm that the component is either PASS or FAIL.
- Select the component and press ENTER. The accuracy test value appears if the monitor status is either PASS or FAIL.
- Enter the following menus using the Techstream: Powertrain/Engine/Monitor/Result. The monitor status appears after the component name.
- CHECK COMPONENT STATUS
- Compare the test value with the minimum test limit (MIN LIMIT) and maximum test limit (MAX LIMIT).
- 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.
A/F Sensor Bank 1
RESULT INFORMATION - A/F SENSOR BANK 1
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $01 | $8E | Multiply by 0.001 | V | A/F sensor deterioration level |
| $01 | $91 | Multiply by 0.004 | mA | A/F sensor current |
A/F Sensor Bank 2
RESULT INFORMATION - A/F SENSOR BANK 2
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $05 | $8E | Multiply by 0.001 | V | A/F sensor deterioration level |
| $05 | $91 | Multiply by 0.004 | mA | A/F sensor current |
HO2S Bank 1 Sensor 2
RESULT INFORMATION - HO2S BANK 1 SENSOR 2
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $02 | $07 | Multiply by 0.001 | V | Minimum sensor voltage |
| $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 | g | Maximum oxygen storage capacity |
HO2S Bank 2 Sensor 2
RESULT INFORMATION - HO2S BANK 2 SENSOR 2
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $06 | $07 | Multiply by 0.001 | V | Minimum sensor voltage |
| $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 | 9 | Maximum oxygen storage capacity |
Catalyst - Bank 1
RESULT INFORMATION (BANK 1) - CATALYST
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $21 | $A9 | Multiply by 0.0003 | No dimension | Oxygen storage capacity of catalyst Bank 1 |
Catalyst - Bank 2
RESULT INFORMATION (BANK 2) - CATALYST
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $22 | $A9 | Multiply by 0.0003 | No dimension | Oxygen storage capacity of catalyst Bank 2 |
EVAP
RESULT INFORMATION - 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) |
Rear Oxygen Sensor Heater
RESULT INFORMATION - 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) - Bank 1
RESULT INFORMATION - SECONDARY AIR INJECTION (AIR) - BANK 1
| Monitor ID | Test ID | Seating | Unit | Description |
|---|---|---|---|---|
| $71 | $E1 | Multiply by 0.01 | g/sec | Test value for AIR insufficient |
| $71 | $E2 | Multiply by 0.01 | kPa | Test value for AIR pump ON stuck |
| $71 | $E3 | Multiply by 0.01 | kPa | Test value for AIR pump OFF stuck |
| $71 | $E4 | Multiply by 0.01 | kPa | Test value for AIR control valve(s) ON stuck |
| $71 | $E5 | Multiply by 0.01 | kPa | Test value for AIR control valve(s) OFF stuck |
Secondary Air Injection (AIR) - Bank 2
RESULT INFORMATION - SECONDARY AIR INJECTION (AIR) - BANK 2
| Monitor ID | Test ID | Scaling | Unit | Description |
|---|---|---|---|---|
| $72 | $E1 | Multiply by 0.01 | g/sec | Test value for AIR insufficient |
| $72 | $E2 | Multiply by 0.01 | kPa | Test value for AIR pump ON stuck |
| $72 | $E3 | Multiply by 0.01 | kPa | Test value for AIR pump OFF stuck |
| $72 | $E4 | Multiply by 0.01 | kPa | Test value for AIR control valve(s) ON stuck |
| $72 | $E5 | Multiply by 0.01 | kPa | Test value for AIR control valve(s) OFF stuck |
Misfire
RESULT INFORMATION - 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 EWMA: Exponential Weighted Moving Average |
| $A1 | $0C | Multiply by 1 | Time |
|
| $A2 | $0B | Multiply by 1 | Time | Total EWMA misfire count of cylinder 1 in last ten driving cycles |
| $A2 | $0C | Multiply by 1 | Time |
|
| $A3 | $0B | Multiply by 1 | Time | Total EWMA misfire count of cylinder 2 in last ten driving cycles |
| $A3 | $0C | Multiply by 1 | Time |
|
| $A4 | $0B | Multiply by 1 | Time | Total EWMA misfire count of cylinder 3 in last ten driving cycles |
| $A4 | $0C | Multiply by 1 | Time |
|
| $A5 | $0B | Multiply by 1 | Time | Total EWMA misfire count of cylinder 4 in last ten driving cycles |
| $A5 | $0C | Multiply by 1 | Time |
|
| $A6 | $0B | Multiply by 1 | Time | Total EWMA misfire count of cylinder 5 in last ten driving cycles |
| $A6 | $0C | Multiply by 1 | Time |
|
| $A7 | $0B | Multiply by 1 | Time | Total EWMA misfire count of cylinder 6 in last ten driving cycles |
| $A7 | $0C | Multiply by 1 | Time |
|
| $A8 | $0B | Multiply by 1 | Time | Total EWMA misfire count of cylinder 7 in last ten driving cycles |
| $A8 | $0C | Multiply by 1 | Time |
|
| $A9 | $0B | Multiply by 1 | Time | Total EWMA misfire count of cylinder 8 in last ten driving cycles |
| $A9 | $0C | Multiply by 1 | Time |
|
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.