DEFINITION OF TERMS
| Terms | Definition |
|---|---|
| Monitor Description | Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details). |
| Related DTCs | 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 stores a DTC when monitored values exceed the malfunction thresholds. |
| 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 when the previous detection operation is completed. |
| Required Sensor/Components | Sensors and components used by the ECM to detect each malfunction. |
| Frequency of Operation | Number of times the ECM checks for each malfunction during each driving cycle. "Once per driving cycle" means the ECM only performs checks for that malfunction once during a single driving cycle. "Continuous" means the ECM performs checks for that malfunction whenever the enabling conditions are met. |
| Duration | Minimum time for which the ECM must detect a continuous deviation in monitored values in order to store a DTC. Timing begins when the Typical Enabling Conditions are met. |
| Malfunction Thresholds | Beyond this value, the ECM will conclude that there is a malfunction and store a DTC. |
| MIL Operation | Timing of MIL illumination after a malfunction is detected. "Immediate" means the ECM illuminates the MIL as soon as a malfunction is detected. "2 driving cycles" means the ECM illuminates the MIL if the same malfunction is detected a second time during the next sequential driving cycle. |
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CHECK FOR INTERMITTENT PROBLEMS
HINT
Inspect the ECM using check mode. Intermittent problems are easier to detect with 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.
- Clear the DTCs, refer to «DTC CHECK / CLEAR»(ref-421952-S20670569172011092600000) .
- Switch the ECM from normal mode to check mode using the Techstream, refer to «CHECK MODE PROCEDURE»(ref-421952-S25071577192011092600000) .
- 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: This process allows the VIN stored in the ECM to be read in order to confirm that the two VINs, the one provided with the vehicle and the one stored in the ECM, are the same. Write VIN: 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 to ON. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Utility / VIN / VIN Read.
- WRITE VIN Confirm the vehicle VIN. 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 / VIN / VIN Write.
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 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 Lexus/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 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-421952-S20670569172011092600000) . Operate the vehicle in accordance with the applicable drive pattern described in Readiness Monitor Drive Pattern, refer to «READINESS MONITOR DRIVE PATTERN»(ref-421952-S03184105072011092600000) . 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: 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 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 When using a generic scan tool, multiply the test value by the scaling value listed below. A/F 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 A/F sensor current A/F 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 A/F sensor current HO2 SENSOR (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 $8F Multiply by 0.0003 g Maximum oxygen storage capacity $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 HO2 SENSOR (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 $8F Multiply by 0.0003 g Maximum oxygen storage capacity $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 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 ADVANCE/RETARDED INTAKE SIDE (BANK 1) Monitor ID Test ID Scaling Unit Description $35 $81 Multiply by 0.01 Second Forced movement of oil control valve time ADVANCE/RETARDED INTAKE SIDE (BANK 2) Monitor ID Test ID Scaling Unit Description $36 $81 Multiply by 0.01 Second Forced movement of oil control valve time ADVANCE/RETARDED EXHAUST SIDE (BANK 1) Monitor ID Test ID Scaling Unit Description $35 $85 Multiply by 0.01 Second Forced movement of oil control valve time ADVANCE/RETARDED EXHAUST SIDE (BANK 2) Monitor ID Test ID Scaling Unit Description $36 $85 Multiply by 0.01 Second Forced movement of oil control valve 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 bank 1 sensor 2 $46 $91 Multiply by 0.001 Ohm Oxygen sensor heater resistance bank 2 sensor 2 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 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 of 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 of 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 of 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 of 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. $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 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 Time Total EWMA* misfire count of cylinder 6 in last ten driving cycles $A7 $0C Multiply by 1 Time 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. 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
READINESS MONITOR DRIVE PATTERN
- PURPOSE OF READINESS TESTS The On-Board Diagnostic (OBD) II system is designed to monitor the performance of emissions-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 Readiness Monitor status reads Compl (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 a vehicle's Readiness Monitor status to show Compl (complete) before beginning emissions tests. The Readiness Monitor will be reset to Incmpl (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 Incmpl (incomplete), follow the appropriate Readiness Monitor Drive Pattern to change the status to Compl (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) Refer to Confirmation Driving Pattern [P0420], refer to «CONFIRMATION DRIVING PATTERN»(ref-422120-S30405703352011092600000) .
- VVT SYSTEM MONITOR Refer to Confirmation Driving Pattern [P0011], refer to «CONFIRMATION DRIVING PATTERN»(ref-422121-S00222709012011092600000) . Refer to Confirmation Driving Pattern [P0014], refer to «CONFIRMATION DRIVING PATTERN»(ref-422121-S42320228012011092600000) .
- EVAP SYSTEM MONITOR (KEY OFF TYPE) Refer to Confirmation Driving Pattern [EVAP System], refer to «CONFIRMATION DRIVING PATTERN»(ref-422119-S11068411932011092600000) .
- AIR-FUEL RATIO (A/F) AND HEATED OXYGEN (HO2) SENSOR MONITORS (ACTIVE AIR-FUEL RATIO CONTROL TYPE) Refer to Confirmation Driving Pattern [P0136], refer to «CONFIRMATION DRIVING PATTERN»(ref-422121-S37248739752011092600000) . Refer to Confirmation Driving Pattern [P2195], refer to «CONFIRMATION DRIVING PATTERN»(ref-422119-S12432644422011092600000) .
- AIR-FUEL RATIO (A/F) AND HEATED OXYGEN (HO2) SENSOR HEATER MONITORS (FRONT A/F AND REAR HO2 SENSOR TYPE) Refer to Confirmation Driving Pattern [P0031], refer to «CONFIRMATION DRIVING PATTERN»(ref-422121-S18402373222011092600000) . Refer to Confirmation Driving Pattern [P0037], refer to «CONFIRMATION DRIVING PATTERN»(ref-422121-S14399004892011092600000) .
CHECK MODE PROCEDURE
HINT
Techstream only
Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect malfunctions that may not be detected in normal mode.
Note. The freeze frame data and all the stored DTCs other than permanent DTCs 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 ON to ACC or off while in check mode. Before changing modes, always check and make a note of the freeze frame data and any DTCs other than permanent DTCs.
Scheme 34
- CHECK MODE PROCEDURE (Using Techstream) Check that the following conditions are met: Battery positive voltage 11 V or higher. Throttle valve fully closed. Shift lever in P or N. 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 the MIL flashes as shown in the illustration. Start the engine. Make sure the MIL turns off. Simulate the conditions of the malfunction described by the customer. Check DTCs and freeze frame data using the Techstream.
FAIL-SAFE CHART
If any of the following DTCs are stored, 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 the air fuel ratio sensor heater. | Ignition switch off |
| P0037, P0038, P0057, P0058, P102D and P105D | Heated Oxygen Sensor Heater | ECM turns off the heated oxygen sensor heater. | Ignition switch off |
| P0102 and P0103 | Mass Air Flow Meter | ECM calculates the ignition timing according to the engine speed and throttle valve position. | Pass condition detected |
| P0112 and P0113 | Intake Air Temperature Sensor | ECM estimates the intake air temperature to be 20°C (68°F). | Pass condition detected |
| P0115, P0117 and P0118 | Engine Coolant Temperature Sensor | ECM estimates the engine coolant temperature to be 80°C (176°F). | Pass condition detected |
| P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P2102, P2103, P2111, P2112, P2118, P2119 and P2135 | Electronic Throttle Control System (ETCS) | ECM cuts off the throttle actuator current and the throttle valve returns to a throttle position of 7° by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal position to allow the vehicle to continue at minimal speed.*1 | Pass condition detected and then ignition switch turned off |
| P0300, P0301, P0302, P0303, P0304, P0305 and P0306*2 | Fuel Injector Electronic Throttle Control System | When a misfire occurs, fuel cut is performed for catalyst overheat malfunction prevention. During normal load and normal engine speed (MIL is blinking): - Fuel cut is performed on the malfunctioning cylinder. During high load and high engine speed (MIL is blinking): - Throttle valve opening angle control is performed. - All cylinder fuel cut or malfunctioning cylinder fuel cut is performed. | Pass condition detected and then ignition switch turned off |
| P0327, P0328, P0332 and P0333 | Knock Sensor | ECM sets the ignition timing to maximum retard. | Ignition switch off |
| P0351 to P0356 | Igniter | ECM cuts the fuel. | Pass condition detected |
| P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 | Accelerator Pedal Position Sensor | Accelerator pedal position sensor has 2 sensor circuits: Main and Sub. If either circuit malfunctions, the ECM controls the engine using the other circuit. If both circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve closes and the engine idles. | Pass condition detected and then ignition switch turned off |
HINT
- *1: The vehicle can be driven slowly when the accelerator pedal is depressed firmly and 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.