PRECAUTION
Note. When disconnecting the negative (-) battery cable, initialize the following systems after the cable is reconnected. System Name See procedure Smart Access System with Push Button Start (Door Lock) Refer to INITIALIZATION Perform the RESET MEMORY (AT) initialization operation after replacing the automatic transmission assembly, engine assembly or ECM. Refer to INITIALIZATION . Perform REGISTRATION (VIN registration) when replacing the ECM. Refer to REGISTRATION .
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 are 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 the 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 checks for malfunctions only once in single driving cycle. "Continuous" means that ECM checks for malfunctions whenever enabling conditions are 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. "Immediate" means that ECM illuminates MIL as soon as a malfunction is detected. "2 driving cycle" means that ECM illuminates MIL if the same malfunction is detected twice during next sequential driving cycle. |
Scheme 22
Scheme 23
Scheme 24
Scheme 25
Scheme 26
Scheme 27
Scheme 28
Scheme 29
Scheme 30
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.
- Switch the ECM from normal mode to check mode using the Techstream. Refer to «CHECK MODE PROCEDURE»(ref-396630-S36473134852011050900000) .
- Perform a simulation test. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-396530-S30973998832011050900000) .
- Check and wiggle the harness(es), connector(s) and terminal(s). Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-396530-S14650221532011050900000) .
REGISTRATION
Note. This Vehicle Identification Number (VIN) must be input into the replaced ECM.
- INPUT INSTRUCTIONS 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 (Vehicle Identification Number) 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 / 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 / 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 instruction to view the monitor status. Although this instruction references the Lexus diagnostic tester, 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. Turn the engine switch on (IG) 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-396630-S10402633792011050900000) . Do not turn the engine switch off. NOTE: The test results will be lost if the engine switch is turned off.
- ACCESS MONITOR RESULT Enter the following menus: 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.
- 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 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 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 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 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 $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 Heated Oxygen 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 $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 0.003 No dimension Oxygen storage capacity of catalyst-bank 1 Catalyst-Bank 2 Monitor ID Test ID Scaling Unit Description $22 $A9 Multiply by 0.003 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) 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 engine switch 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 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 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 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 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 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 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.
Scheme 31
Scheme 32
Scheme 33
- 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 in different driving conditions, the OBD II system is designed to run separate monitoring programs called Readiness Monitors. The Techstream software must be version 9.0 or newer to view the Readiness Monitor status. To view the status, select the following menu items: Powertrain / Engine / 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 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 broken 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. Turn the engine switch on (IG). Turn the Techstream on. Clear the DTCs. Start the engine and warm it up. Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes. 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 to 95°F). The intake air temperature is between 4.4°C and 35°C (40°F to 95°F). Vehicle was driven in the city area (or on free-way) for 10 minutes or more. Monitor Conditions Turn the engine 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 engine switch on (IG). 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.
- A/F SENSOR AND HO2S MONITORS 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 Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear the DTCs. Start the engine, and warm it up until the ECT reaches 75°C (167°F) or higher. Drive the vehicle at between 38 mph and 75 mph (60 km/h and 120 km/h) for at least 10 minutes. Change the transmission to the 2nd gear. Accelerate the vehicle to 40 mph (64 km/h) or more by depressing the accelerator pedal for at least 10 seconds (Procedure "A"). Soon after performing procedure "A" above, release the accelerator pedal for at least 4 seconds without depressing the brake pedal, in order to execute fuel-cut control (Procedure "B"). Allow the vehicle to decelerate until the vehicle speed declines to less than 6 mph (10 km/h) (Procedure "C"). Repeat procedures from "A" through "C" above at least 3 times in one driving cycle. 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 the Drive Pattern again.
- 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 Connect the Techstream to the DLC3. Turn the engine switch on (IG). Clear the DTCs. Start the engine. Allow the engine to idle for 10 minutes or more. Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes. Monitor Status 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 the Drive Pattern.
CHECK MODE PROCEDURE
HINT
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 34
- CHECK MODE PROCEDURE (Using Techstream) Check and ensure the following conditions: Battery voltage 11 V or more. Throttle valve fully closed. Shift lever is in P or N. 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. Enter the following menus: Powertrain / Engine / Utility / Check Mode. Switch the ECM from normal mode to check mode. Make sure that the MIL flashes as shown in the illustration. Start the engine. 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.
| DTCs | Components | Fail-Safe Operations | Fail-Safe Deactivation Conditions |
|---|---|---|---|
| P0031, P0032, P0051 and P0052 | Air-Fuel Ratio (A/F) Sensor Heater | The ECM turns off A/F sensor heater | Engine switch off |
| P0037, P0038, P0057 and P0058 | Heated Oxygen (HO2) Sensor Heater | The ECM turns off HO2 sensor heater | Engine switch off |
| P0102 and P0103 | Mass Air Flow (MAF) Meter | The ECM calculates ignition timing according to engine speed and throttle valve position | Pass condition detected |
| P0112 and P0113 | Intake Air Temperature (IAT) Sensor | The ECM estimates IAT to be 20°C (68°F) | Pass condition detected |
| P0115, P0117 and P0118 | Engine Coolant Temperature (ECT) Sensor | The ECM estimates ECT to be 80°C (176°F) | Pass condition detected |
| P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P060A, P060B, P060D, P060E, P0657, P2102, P2103, P2111, P2112, P2118, P2119 and P2135 | Electronic Throttle Control System (ETCS) | The ECM cuts off throttle actuator current and the throttle valve returned to the 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 angle, to allow vehicle to continue at minimal speed *1 | Pass condition detected and then engine switch turned off |
| P0300, P0301, P0302, P0303, P0304, P0305, P0306*2 | Fuel injector Electric Throttle Control System (ETCS) | When catalyst damage misfire occurs (MIL blinking), following fail-safe operation performed for catalyst overheat malfunction prevention Under low load and low engine speed Fuel cut performed on malfunctioning cylinder Under high load and high engine speed Throttle valve 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 | The ECM sets ignition timing to maximum retard | Engine switch off |
| P0351 to P0356 | Igniter | The ECM cuts fuel | Pass condition detected |
| 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 circuits malfunctions, the ECM controls engine using the other circuit If both of circuits malfunction, the 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
*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.