PRECAUTION
Note. When disconnecting the battery terminal, initialize the following systems after the terminal is reconnected. System Name See Procedure Intuitive Parking Assist System Refer to INITIALIZATION Variable Gear Ratio Steering System Theft Deterrent System Perform the RESET MEMORY (A/T initialization) operation after replacing the automatic transmission assembly, engine assembly or ECM.
HINT
RESET MEMORY cannot be completed by only disconnecting the battery terminal.
DEFINITION OF TERMS
| Terms | Definition |
|---|---|
| Monitor Description | Description of what ECM monitors and how to detect malfunctions (monitoring purpose and its details). |
| Related DTCs | A group of diagnostic trouble codes that are output by ECM based on the same malfunction detection logic. |
| Typical Enabling Condition | Preconditions that allow ECM to detect malfunctions. With all preconditions satisfied, ECM sets DTC when monitored value(s) exceeds malfunction threshold(s). |
| Sequence of Operation | Order of monitor priority, applied if multiple sensors and components involved in single malfunction detection process. Each sensor and component monitored in turn and not monitored until previous detection operation is completed. |
| Required Sensor/Components | Sensors and components used by ECM to detect each malfunction. |
| Frequency of Operation | Number of times ECM checks for each malfunction during each driving cycle. "Once per driving cycle" means that ECM only checks for malfunctions once during single driving cycle. "Continuous" means that ECM checks for malfunctions whenever enabling conditions met. |
| Duration | Minimum time for which ECM must detect continuous deviation in monitored value(s) in order to set DTC. Timing begins when Typical Enabling Conditions are met. |
| Malfunction Thresholds | Value beyond which ECM determines malfunctions exist and sets DTCs. |
| MIL Operation | Timing of MIL illumination after a malfunction is detected. "Immediately" means that ECM illuminates MIL as soon as a malfunction detected. "2 driving cycle" means that ECM illuminates MIL if the same malfunction is detected second time during next sequential driving cycle. |
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CHECK FOR INTERMITTENT PROBLEMS
HINT
Inspect the vehicle's 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.
- Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-382723-S32023580312011012800000) .
- Switch the ECM from normal mode to check mode using the Techstream. Refer to «CHECK MODE PROCEDURE»(ref-382723-S26645782532011012800000) .
- 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 replaced ECM.
- DESCRIPTION HINT: This registration section 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 engine switch on (IG). Turn the Techstream 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 engine switch on (IG). Turn the Techstream 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 catalyst, evaporative emission (EVAP) and thermostat.
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 test limit and maximum test limit, the ECM (PCM) interprets this as a malfunction. When the component is not malfunctioning, if the difference of the test value and test limit is very small, the component will malfunction in the near future.
Perform the following instructions to view the monitor status. Although the Lexus diagnostic tester is used in the following instructions, it can be checked using a generic OBD II scan tool. Refer to your scan tool operator's manual for specific procedures.
- PERFORM MONITOR DRIVE PATTERN Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Clear the DTCs. Run the vehicle in accordance with the applicable drive pattern described in READINESS MONITOR DRIVE PATTERN. Refer to «READINESS MONITOR DRIVE PATTERN»(ref-382723-S37214641022011012800000) . Do not turn the engine switch off. NOTE: The test results will be lost if the engine switch is turned off.
- ACCESS MONITOR RESULT Select the following menu items: Powertrain / Engine and ECT / 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.
- CHECK COMPONENT STATUS Compare the test value with the minimum test limit (Minimum Limit) and maximum test limit (Maximum 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 will 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 that the system was malfunctioning in the 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 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 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 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 $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 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 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 $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 $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 EWMA: Exponential Weighted Moving Average $A1 $0C Multiply by 1 Time When engine switch is on (IG), 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 engine switch is on (IG), 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 engine switch is on (IG), 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 engine switch is on (IG), 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 engine switch is on (IG), 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 engine switch is on (IG), 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 engine switch is on (IG), 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.
READINESS MONITOR DRIVE PATTERN
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 with 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 status, select the following menu items: Powertrain / Engine and ECT / Monitor / Status 2.
- When the Readiness Monitor Status 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 a vehicle's Readiness Monitor Status to show Complete before beginning emission tests.
The Readiness Monitor 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).
Contents
| Step | Section Title |
|---|---|
| 1 | Catalyst Monitor (Active Air-Fuel Ratio Control Type) |
| 2 | EVAP System Monitor (Key-Off Type) |
| 3 | Air-Fuel Ratio (A/F) and Heated Oxygen (HO2) Sensor Monitors (Active Air-Fuel Ratio Control Type) |
| 4 | Air-Fuel Ratio (A/F) and Heated Oxygen (HO2) Sensor Heater Monitors (Front A/F and Rear HO2 Sensor Type) |
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- 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 engine switch on (IG). Turn the Techstream or scan tool ON. Clear DTCs (if set). Refer to «DTC CHECK / CLEAR»(ref-382723-S32023580312011012800000) . Start the engine and warm it up (Procedure "A"). Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes (Procedure "B"). Monitor Status Check the Readiness Monitor Status displayed on the Techstream or scan tool. If the status does not switch to Complete, extend the driving time.
- EVAP SYSTEM MONITOR (KEY-OFF TYPE) Preconditions The monitor will not run unless: The fuel tank is less than 90% full. The altitude is less than 8000 ft (2450 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). Vehicle was driven in the city area (or on freeway) for 10 minutes or more. Monitor Conditions Turn the engine switch off and wait for 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 engine switch on (IG). Turn the Techstream or scan tool on. Check the Readiness Monitor Status displayed on the Techstream or scan tool. 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 (A/F) AND HEATED OXYGEN (HO2) SENSOR MONITORS (ACTIVE AIR-FUEL RATIO CONTROL TYPE) Preconditions The monitor will not run unless: 2 minutes or more have elapsed since the engine was started. The Engine Coolant Temperature (ECT) 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. Fuel-cut control is performed for 8 seconds or more (for the Rear HO2 Sensor Monitor) Drive Pattern for front A/F sensor and HO2 sensor (1) Connect the Techstream to the DLC3. (2) Turn the engine switch on (IG). (3) Turn the Techstream on. (4) Clear DTCs. Refer to «DTC CHECK / CLEAR»(ref-382723-S32023580312011012800000) . (5) Start the engine, and warm it up until the ECT reaches 75°C (167°F) or higher (Procedure "A"). (6) Drive the vehicle at 38 mph (60 km/h) or more for at least 10 minutes (Procedure "B"). (7) Change the transmission to 2nd gear (Procedure "C"). (8) Accelerate the vehicle to 40 mph (64 km/h) or more by depressing the accelerator pedal for at least 10 seconds (Procedure "D"). (9) Soon after performing Procedure "D" above, release the accelerator pedal for at least 4 seconds without depressing the brake pedal, in order to execute fuel-cut control (Procedure "E"). (10) Allow the vehicle to decelerate until the vehicle speed declines to less than 6 mph (10 km/h) (Procedure "F"). (11) Repeat procedure "D" through "F" above at least 3 times in one driving cycle (Procedure "G"). Monitor Status (1) Check the Readiness Monitor Status displayed on the Techstream. (2) If the status does not switch to Complete, make sure that the preconditions have been met, and then perform procedure "A" through "G" in Drive Pattern above.
- AIR-FUEL RATIO (A/F) AND HEATED OXYGEN (HO2) SENSOR HEATER MONITORS (FRONT A/F AND REAR HO2 SENSOR TYPE) Preconditions The monitor will not run unless: The MIL is OFF Drive Pattern (1) Connect the Techstream to the DLC3. (2) Turn the engine switch on (IG). (3) Turn the Techstream or scan tool on. (4) Clear DTCs. Refer to «DTC CHECK / CLEAR»(ref-382723-S32023580312011012800000) . (5) Start the engine (Procedure "A"). (6) Allow the engine to idle for 10 minutes or more (Procedure "B"). (7) Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes (Procedure "C"). Monitor Status (1) Check the Readiness Monitor Status displayed on the Techstream or scan tool. If the status does not switch to Complete, make sure that the preconditions have been met, and repeat procedure through "A" to "C" described in the Drive Pattern above.
CHECK MODE PROCEDURE
HINT
The Techstream only
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 erased if: 1) the ECM is changed from normal mode to check mode or vice versa; or 2) the engine switch is turned from on (IG) to on (ACC) or off while in check mode. Before changing modes, always check and note any DTCs and freeze frame data.
Scheme 36
- CHECK MODE PROCEDURE (Using the Techstream) Check and ensure the following condition: Battery positive voltage 11 V or more. Throttle valve fully closed. Transmission in the P or N position. A/C switch off. Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Select the following menu items: 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 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 and P0052 | Air-Fuel Ratio (A/F) Sensor Heater | ECM turns off A/F sensor heater | Engine switch off |
| P0037, P0038, P0057 and P0058 | Heated Oxygen Sensor (HO2S) Heater | ECM turns off HO2 sensor heater | Engine switch off |
| P0087, P0088 | Fuel Pump for High Pressure | Stop the fuel pump for high pressure Limit the engine speed to 2000 RPM or less | Pass condition detected |
| P0100, P0102 and P0103 | Mass Air Flow (MAF) Meter | ECM calculates ignition timing according to engine speed and throttle valve position | Pass condition detected |
| P0110, P0112 and P0113 | Intake Air Temperature (IAT) Sensor | ECM estimates IAT to be 20°C (68°F) | Pass condition detected |
| P0115, P0117 and P0118 | Engine Coolant Temperature (ECT) Sensor | ECM estimates ECT to be 80°C (176°F) | Pass condition detected |
| P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P0657, P2102, P2103, P2111, P2112, P2118, P2119 and P2135 | Electronic Throttle Control System (ETCS) | ECM cuts off throttle actuator current and throttle valve returns to 6° throttle position by return spring. 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*. | Pass condition detected and then engine switch turned off |
| P0171, P0172, P0174, P0175 | Fuel trim | Air-fuel ratio feedback control is stopped | Pass condition detected and then engine switch turned off |
| P0190, P0192, P0193 | Fuel Pressure Sensor | Stop the fuel pump for high pressure Limit the engine speed to 2000 RPM or less | Pass condition detected and then engine switch turned off |
| P0201, P0202, P0203, P0204, P0205, P0206, P12FF | Injector Driver (EDU) | INJ relay is shut off | Pass condition detected and then engine switch turned off |
| P0300, P0301, P0302, P0303, P0304, P0305 and P0306*2 | Fuel injector Electronic throttle control system | When 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 malfunctioning cylinder During high load and high engine speed (MIL is blinking) Throttle valve opening angle control is performed All cylinder fuel cut or malfunction cylinder fuel cut | Pass condition detected and then engine switch turned off |
| P0327, P0328, P0332 and P0333 | Knock Sensor | ECM sets ignition timing to maximum retard | Engine switch off |
| P0351 to P0356 | Ignition Coil | ECM cuts fuel | Pass condition detected |
| P0504 | Stop light switch | Accelerator pedal angle is fixed | Pass condition detected |
| P062D | Injector Driver (EDU) | INJ relay is shut off | Pass condition detected and then engine switch turned off |
| P1235 | Fuel Pump for High Pressure (spill control valve) | Stop the fuel pump for high pressure Limit the engine speed to 2000 RPM or less | Pass condition detected |
| P1276, P1277, P1278, P1279, P127A, P127B | Fuel injector for port injection | Limit the engine speed to 2000 RPM or less Fuel cut of malfunction cylinder | Pass condition detected and then engine switch turned off |
| P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256 | A/F sensor | Air-fuel ratio feedback control is stopped | Pass condition detected and then engine switch turned off |
| P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 | Accelerator Pedal Position (APP) Sensor | APP sensor has 2 sensor circuits: Main and Sub. If either of the circuits malfunctions, ECM controls engine using the other circuit. If both of the circuits malfunction, ECM regards accelerator pedal as being released. As a result, throttle valve is closed and engine idles. | Pass condition detected and then engine switch turned off |
Note. *: 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.