DEFINITION OF TERMS
| Term | Definition |
|---|---|
| Monitor Description | Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details). |
| Related DTCs | A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic. |
| Typical Enabling Condition | Preconditions that allow the ECM to detect malfunctions. With all preconditions satisfied, the ECM sets the DTCs when monitored value(s) exceed malfunction threshold(s). |
| Sequence of Operation | Order of monitor priority, applied if multiple sensors and components are involved in a single malfunction detection process. Each sensor and component is monitored in turn and is not monitored until the previous detection operation is completed. |
| Required Sensor/Components | The sensors and components used by the ECM to detect each malfunction. |
| Frequency of Operation | The number of times the ECM checks for each malfunction during each driving cycle. "Once per driving cycle" means that the ECM only checks for malfunctions once during a single driving cycle. "Continuous" means that the ECM checks for malfunctions whenever enabling conditions are met. |
| Duration | The minimum time for which the ECM must detect a continuous deviation in monitored value(s) in order to set a DTC. Timing begins when Typical Enabling Conditions are met. |
| Malfunction Thresholds | Value, beyond which, the ECM determines that a malfunction exists and sets a DTC. |
| MIL Operation | Timing of MIL illumination after a malfunction is detected. "Immediate" means that the ECM illuminates the MIL as soon as a malfunction is detected. "2 driving cycle" means that the ECM illuminates the MIL if the same malfunction is detected a second time during next sequential driving cycle. |
Scheme 774
Scheme 775
Scheme 776
Scheme 777
Scheme 778
Scheme 779
Scheme 780
Scheme 781
CHECK FOR INTERMITTENT PROBLEMS
HINT
Inspect the ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Clear the DTCs, refer to «DTC CHECK / CLEAR»(ref-426655-S13741789592011101200000) .
- Switch the ECM from normal mode to check mode using the Techstream, refer to «CHECK MODE PROCEDURE»(ref-426655-S34553543612011101200000) .
- Perform a simulation test.
- Check and wiggle the harness(es), connector(s) and terminal(s).
REGISTRATION
Note. The Vehicle Identification Number (VIN) must be input into the replacement ECM.
HINT
The VIN is a 17-digit alphanumeric vehicle identification number. The Techstream is required to register the VIN.
- DESCRIPTION HINT: This registration service information consists of two parts: Read VIN and Write VIN. Read VIN: Explains the VIN reading process in a flowchart. This process allows the VIN stored in the ECM to be read in order to confirm that the two VINs, provided with the vehicle and stored in the vehicle's ECM, are the same. Write VIN: Explains the VIN writing process in a flowchart. This process allows the VIN to be input into the ECM. If the ECM is changed, or the ECM VIN and vehicle VIN do not match, the VIN can be registered, or overwritten in the ECM by following this procedure.
- READ VIN Confirm the vehicle VIN. Connect the Techstream to the DLC3. Turn the ignition switch ON. Turn the tester on. Select the following menu items: Powertrain / Engine and ECT / Utility / VIN / VIN Read.
- WRITE VIN Confirm the vehicle VIN. Connect the Techstream to the DLC3. Turn the ignition switch ON. Turn the tester on. Select the following menu items: Powertrain / Engine and ECT / Utility / VIN / VIN Write.
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 the catalysts and evaporative emission (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 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 Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Clear the DTCs, refer to «DTC CHECK / CLEAR»(ref-426655-S13741789592011101200000) . Run the vehicle in accordance with the applicable drive pattern described in Readiness Monitor Drive Pattern, refer to «READINESS MONITOR DRIVE PATTERN»(ref-426655-S22546860722011101200000) . Do not turn the ignition switch off. NOTE: The test results will be lost if the ignition switch is turned off.
- ACCESS MONITOR RESULT Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Result. 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. Display the test results for a monitor by selecting the icon in the Details column for that monitor. Display the test value for an item listed under Test Results by selecting the icon in the Details column for that item.
- 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 test limit and maximum test limit, the component is functioning normally. If not, the component is malfunctioning. The test value is usually significantly higher or lower than the test limit. If the test value is on the borderline of the test limit, the component may malfunction in near future. HINT: The monitor result might show a pass on rare occasions 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 BANK 1 Monitor ID Test ID Scaling Unit Description $35 $81 Multiply by 0.01 Second Time of forced movement of oil control valve Advance / Retarded Intake Side BANK 2 Monitor ID Test ID Scaling Unit Description $36 $81 Multiply by 0.01 Second Time of forced movement of oil control valve Exhaust Gas Recirculation System Monitor ID Test ID Scaling Unit Description $31 $BD Multiply by 0.01 kPa Delta Manifold Absolute Pressure Air Fuel Ratio Sensor Bank 1 Sensor 1 Monitor ID Test ID Scaling Unit Description $01 $8A Multiply by 0.00012 V Rich to Lean response rate deterioration level $01 $8A Multiply by 0.00012 V Lean to Rich response rate deterioration level $01 $90 Multiply by 0.001 Second Rich to Lean delay level $01 $90 Multiply by 0.001 Second Lean to Rich delay level $01 $91 Multiply by 0.004 mA Air fuel ratio sensor current Air Fuel Ratio Sensor Bank 2 Sensor 1 Monitor ID Test ID Scaling Unit Description $05 $8A Multiply by 0.00012 V Rich to Lean response rate deterioration level $05 $8A Multiply by 0.00012 V Lean to Rich response rate deterioration level $05 $90 Multiply by 0.001 Second Rich to Lean delay level $05 $90 Multiply by 0.001 Second Lean to Rich delay level $05 $91 Multiply by 0.004 mA Air fuel ratio sensor current Heated Oxygen Sensor Bank 1 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 Heated Oxygen Sensor Bank 2 Sensor 2 Monitor ID Test ID Scaling Unit Description $06 $08 Multiply by 0.001 V Maximum sensor voltage $06 $8B Multiply by 0.001 Seconds 0.35 - 0.2 V sensor switch time $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 g Maximum oxygen storage capacity Catalyst - Bank 1 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 Monitor ID Test ID Scaling Unit Description $22 $A9 Multiply by 0.0003 No dimension Oxygen storage capacity of catalyst bank 2 EVAP Monitor ID Test ID Scaling Unit Description $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) $3D $D8 Multiply by 0.001 kPa Test value for canister small leak (P1420) $3D $D9 Multiply by 0.001 kPa Test value for canister gross leak (P1421) $3D $DA Multiply by 0.001 kPa Test value for fuel tank small leak (P1422) $3D $DB Multiply by 0.001 kPa Test value for fuel tank gross leak (P1423) $3D $DC Multiply by 0.001 kPa Test value for tank closed valve close stuck (P2451) $3D $DD Multiply by 0.001 kPa Test value for tank closed valve open stuck (P2450) 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 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 air fuel ratio sensor Fuel System / ENGINE SPEED FLUCTUATION AVERAGE B1 Monitor ID Test ID Scaling Unit Description $81 $82 Multiply by 0.001 No dimension Monitoring method using crank angle 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 air fuel ratio sensor Fuel System / ENGINE SPEED FLUCTUATION AVERAGE B2 Monitor ID Test ID Scaling Unit Description $82 $82 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 Time Total EWMA* misfire count of all cylinders in last ten driving cycles EWMA: Exponential Weighted Moving Average $A1 $0C Multiply by 1 Time When ignition switch 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 of cylinder 1 in last ten driving cycles $A2 $0C Multiply by 1 Time When ignition switch 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 of cylinder 2 in last ten driving cycles $A3 $0C Multiply by 1 Time When ignition switch 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 of cylinder 3 in last ten driving cycles $A4 $0C Multiply by 1 Time When ignition switch 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 of cylinder 4 in last ten driving cycles $A5 $0C Multiply by 1 Time When ignition switch 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 Time Total EWMA* misfire count of cylinder 5 in last ten driving cycles $A6 $0C Multiply by 1 Time When ignition switch 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 Time Total EWMA* misfire count of cylinder 6 in last ten driving cycles $A7 $0C Multiply by 1 Time When ignition switch 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. 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
Scheme 782
Scheme 783
Scheme 784
- PURPOSE OF READINESS TESTS The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission related components, and indicate any detected abnormalities using DTCs (Diagnostic Trouble Codes). Since various components need to be monitored during different driving conditions, the OBD II system is designed to run separate monitoring programs called Readiness Monitors. To view the monitor status, enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Current. When the status of a Readiness Monitor reads Complete, the necessary conditions have been met for running the performance tests for that Readiness Monitor. A generic OBD II scan tool can also be used to view the Readiness Monitor status. HINT: Many state Inspection and Maintenance (I/M) programs require the status of vehicle Readiness Monitor to show Complete before beginning emission tests. The Readiness Monitors will be reset to Incomplete if: The ECM has lost battery power or blown a fuse. DTCs have been cleared. The conditions for running the Readiness Monitor have not been met. If the Readiness Monitor status shows Incomplete, follow the appropriate Readiness Monitor Drive Pattern to change the status to Complete. WARNING: Strictly observe posted speed limits, traffic laws, and road conditions when performing these drive patterns. NOTE: These drive patterns represent the fastest method of satisfying all conditions necessary to achieve complete status for each specific Readiness Monitor. In the event of a drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed. In most cases, the Readiness Monitor will still achieve complete status upon completion of the drive pattern. To ensure completion of the Readiness Monitors, avoid sudden changes in vehicle load and speed (driving up and down hills and/or sudden acceleration).
- CATALYST MONITOR (ACTIVE AIR FUEL RATIO CONTROL TYPE) Preconditions The monitor will not run unless: The MIL is off. Drive Pattern Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Clear the DTCs, refer to «DTC CHECK / CLEAR»(ref-426655-S13741789592011101200000) . Put the engine in inspection mode, refer to «INSPECTION MODE PROCEDURE»(ref-426649-S00975887492011101200000) . Start the engine and warm it up [A]. Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes [B]. Monitor Status Check the Readiness Monitor status displayed on the Techstream. If the status does not switch to Complete, extend the driving time.
- EVAP MONITOR (KEY OFF TYPE) Preconditions The monitor will not run unless: The fuel tank is less than 90% full. The altitude is less than 7874 ft. (2400 m). The vehicle is stationary. The engine coolant temperature is between 4.4°C and 35°C (40°F and 95°F). The intake air temperature is between 4.4°C and 35°C (40°F and 95°F). The vehicle was driven in a city area (or on a freeway) for 10 minutes or more. Monitor Conditions Turn the ignition switch off and wait for 5 to 10 hours. HINT: Do not start the engine until checking Readiness Monitor status. If the engine is started, the step described above must be repeated. Monitor Status Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Check the Readiness Monitor status displayed on the Techstream. If the status does not switch to Complete, restart the engine, make sure that the preconditions have been met, and then perform the Monitor Conditions again.
- AIR FUEL RATIO SENSOR AND HEATED OXYGEN SENSOR MONITORS Preconditions The monitor will not run unless: 2 minutes or more have elapsed since the engine was started. The engine coolant temperature is 75°C (167°F) or more. Cumulative driving time at a vehicle speed of 30 mph (48 km/h) or more exceeds 6 minutes. Air fuel ratio feedback control is performed. Drive Pattern for the air fuel ratio sensor and heated oxygen sensor Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Clear the DTCs, refer to «DTC CHECK / CLEAR»(ref-426655-S13741789592011101200000) . Put the engine in inspection mode, refer to «INSPECTION MODE PROCEDURE»(ref-426649-S00975887492011101200000) . Start the engine, and warm it up until the engine coolant temperature reaches 75°C (167°F) or more [A]. Drive the vehicle at between 37 mph and 75 mph (60 km/h and 120 km/h) or more for at least 10 minutes [B]. Shift the shift lever to S, select the S2 range [C]. Accelerate the vehicle to 40 mph (64 km/h) or more by depressing the accelerator pedal for at least 10 seconds [D]. Soon after performing step [D] above, release the accelerator pedal for at least 4 seconds without depressing the brake pedal, in order to execute fuel cut control [E]. Allow the vehicle to decelerate until the vehicle speed declines to less than 6 mph (10 km/h) [F]. Repeat steps from [D] through [F] above at least 3 times in one driving cycle [G]. Monitor Status Check the Readiness Monitor status displayed on the Techstream. If the status does not switch to Complete, make sure that the preconditions have been met, and then perform steps [A] through [G] in Drive Pattern above.
- AIR FUEL RATIO SENSOR AND HEATED OXYGEN SENSOR HEATER MONITORS (FRONT AIR FUEL RATIO SENSOR AND REAR HEATED OXYGEN SENSOR TYPE) Preconditions The monitor will not run unless: The MIL is off. Drive Pattern Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Clear the DTCs, refer to «DTC CHECK / CLEAR»(ref-426655-S13741789592011101200000) . Put the engine in inspection mode, refer to «INSPECTION MODE PROCEDURE»(ref-426649-S00975887492011101200000) . Start the engine. Allow the engine to idle for 10 minutes or more [A]. Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes [B]. Monitor Status Check the Readiness Monitor status displayed on the Techstream. If the status does not switch to Complete, make sure that the preconditions have been met, and repeat the Drive Pattern above.
CHECK MODE PROCEDURE
HINT
Compared to the normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected in normal mode.
Note. All the stored DTCs and freeze frame data are cleared if: 1) the ECM is changed from normal mode to check mode or vice versa; or 2) the ignition switch is turned from to ON to ACC or off while in check mode. Before changing modes, always check and note any DTCs and freeze frame data.
Scheme 785
- CHECK MODE PROCEDURE Check and ensure the following conditions: Positive (+) battery voltage 11 V or more. Throttle valve fully closed. Shift lever in P. A/C switch off. Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Utility / Check Mode. Switch the ECM from normal mode to check mode. Make sure that the MIL flashes as shown in the illustration. Turn the ignition switch to ON (READY). Make sure that the MIL turns off. Duplicate the conditions of the malfunction described by the customer. Check for DTCs and freeze frame data using the Techstream.
FAIL-SAFE CHART
If any of the following DTCs are set, the ECM enters fail-safe mode to allow the vehicle to be driven temporarily.
| DTC | Component | Fail-Safe Operation | Fail-Safe Deactivation Condition |
|---|---|---|---|
| P0031, P0032, P0051, P0052, P101D and P103D | Air fuel ratio sensor heater | ECM turns off air fuel ratio sensor heater | Ignition switch off |
| P0037, P0038, P0057, P0058, P102D and P105D | Heated oxygen sensor heater | ECM turns off heated oxygen sensor heater | Ignition switch off |
| P0102 and P0103 | Mass air flow meter sub-assembly | ECM calculates ignition timing according to engine speed and throttle valve position | Pass condition detected |
| P0107 and P0108 | Manifold absolute pressure sensor | ECM calculates ignition timing according to engine speed and throttle valve position | Pass condition detected |
| P0112 and P0113 | Intake air temperature sensor | ECM estimates intake air temperature sensor to be 20°C (68°F) | Pass condition detected |
| P0115, P0117 and P0118 | Engine coolant temperature sensor | ECM estimates engine coolant temperature sensor to be 80°C (176°F) | Pass condition detected |
| P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P060A, P060B, P060E, P0657, P2102, P2103, P2111, P2112, P2118, P2119 and P2135 | Electronic throttle control system | The ECM cuts off throttle actuator current and the throttle valve returns to 6° throttle position by return spring The ECM then adjusts engine output by controlling fuel injection (intermittent fuel cut) and ignition timing in accordance with accelerator pedal opening angle to allow vehicle to continue at minimal speed*1 | Pass condition detected and then ignition switch turned off |
| P0327, P0328, P0332 and P0333 | Knock control sensor | The ECM sets ignition timing to maximum retard | Ignition switch off |
| P0351, P0352, P0353, P0354, P0355 and P0356 | Igniter | The ECM cuts fuel | Pass condition detected |
| P0401 | Exhaust Gas Recirculation Flow | ECM assumes that EGR valve is closed, and ignition advance is controlled to a safe value | Pass condition detected |
| P0403 | Exhaust Gas Recirculation Control Circuit | ECM assumes that EGR valve is closed, and ignition advance is controlled to a safe value | Pass condition detected |
Note. *1: The vehicle can be driven slowly when the accelerator pedal is depressed slowly. If the accelerator pedal is depressed quickly, the vehicle may speed up and slow down erratically. *2: Misfire related fail-safe operations occur when catalyst overheat malfunctions occur.