PRECAUTION
- INITIALIZATION NOTE: If the ECM is replaced, register the ECU communication ID for Engine Immobiliser System. Refer to «REGISTRATION»(ref-493955-S21275878882012081000000) . Perform Registration (VIN registration) when replacing the ECM. Refer to «REGISTRATION»(ref-493953-S08840987992012081000000) . Perform initialization (throttle position) after replacing the throttle body assembly or cleaning any throttle body components. Refer to «INSTALLATION - Step 13»(ref-493956-S18906655992012081000000) . Perform initialization (throttle position) after reconnecting the battery cable or replacing the ECM. Refer to «INSTALLATION - Step 13»(ref-493956-S18906655992012081000000) . HINT: Initialization cannot be completed by only disconnecting and reconnecting the cable of the negative (-) battery terminal.
- WHEN USING TECHSTREAM WARNING: Observe the following items for safety reasons: Before using the Techstream, read the instruction manual. Prevent the Techstream cable from being caught on the pedals, shift lever or steering wheel when driving with the Techstream connected to the vehicle. When driving the vehicle for testing purposes using the Techstream, 2 persons are required. One is for driving the vehicle, and the other operates the Techstream.
DEFINITION OF TERMS
| Term | Definition |
|---|---|
| Monitor Description | Description of what ECM monitors and how it detects malfunctions (monitoring purpose and details). |
| Related DTCs | Group of diagnostic trouble codes that are output by ECM based on same malfunction detection logic. |
| Typical Enabling Condition | Preconditions that allow ECM to detect malfunctions. With all preconditions satisfied, ECM stores 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 is monitored in turn, when 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 ECM only performs checks for that malfunction once during single driving cycle. "Continuous" means ECM performs checks for that malfunction whenever enabling conditions are met. |
| Duration | Minimum time for which ECM must detect continuous deviation in monitored value(s) in order to store DTC. Timing begins when Typical Enabling Conditions are met. |
| Malfunction Thresholds | Value beyond which ECM determines malfunctions exist and stores DTCs. |
| MIL Operation | Timing of MIL illumination after malfunction is detected. "Immediate" means ECM illuminates MIL as soon as malfunction is detected. "2 driving cycles" means ECM illuminates MIL if same malfunction is detected second time during next sequential driving cycle. |
Scheme 24
Scheme 25
Scheme 26
Scheme 27
Scheme 28
Scheme 29
Scheme 30
Scheme 31
CHECK FOR INTERMITTENT PROBLEMS
HINT
Inspect the vehicle 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-493953-S27327777792012081000000) .
- Switch the ECM from normal mode to check mode using the Techstream. Refer to «CHECK MODE PROCEDURE»(ref-493953-S07819423712012081000000) .
- Perform a simulation test. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-493943-S22682551262012081000000) .
- Check and wiggle the harness(es), connector(s) and terminal(s). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-493943-S22682551262012081000000) .
REGISTRATION
Note. The Vehicle Identification Number (VIN) must be input into a replacement ECM.
HINT
The VIN is a 17-digit alphanumeric vehicle identification number. The Techstream is required to register the VIN.
- DESCRIPTION (Using the Techstream) HINT: This registration section consists of 2 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 2 VINs, provided with the vehicle and stored in the vehicle ECM, are the same. Write VIN: This process allows the VIN to be input into the ECM. If the ECM is replaced, 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 / 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 / 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 and turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(ref-493953-S27327777792012081000000) . Operate the vehicle in accordance with the applicable drive pattern described in Readiness Monitor Drive Pattern. Refer to «READINESS MONITOR DRIVE PATTERN»(ref-493953-S21290844122012081000000) . 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 / 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 and test values for a monitor by selecting the icon in the Details column for that monitor.
- 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 value by the scaling value listed below. ADVANCE/RETARDED INTAKE SIDE Monitor ID Test ID Scaling Unit Description $35 $81 Multiply by 0.01 Seconds Forced movement of oil control valve time ADVANCE/RETARDED EXHAUST SIDE Monitor ID Test ID Scaling Unit Description $35 $85 Multiply by 0.01 Seconds Forced movement of oil control valve time AIR FUEL RATIO SENSOR (SENSOR 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 HEATED OXYGEN SENSOR (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 CATALYST Monitor ID Test ID Scaling Unit Description $21 $A9 Multiply by 0.0003 No dimension Oxygen storage capacity of catalyst 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 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 $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. 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 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 status, enter the following menus: Powertrain / Engine / 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 Monitor is 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).
- VVT SYSTEM MONITOR Refer to Confirmation Driving Pattern [P0011]. Refer to «CONFIRMATION DRIVING PATTERN»(ref-494127-S31396483512012081000000) . Refer to Confirmation Driving Pattern [P0014]. Refer to «CONFIRMATION DRIVING PATTERN»(ref-494127-S07551025842012081000000) .
- CATALYST MONITOR (ACTIVE AIR-FUEL RATIO CONTROL TYPE) Refer to Confirmation Driving Pattern [P0420]. Refer to «CONFIRMATION DRIVING PATTERN»(ref-494127-S01390841622012081000000) .
- EVAP SYSTEM MONITOR (KEY OFF TYPE) Refer to Confirmation Driving Pattern [EVAP System]. Refer to «CONFIRMATION DRIVING PATTERN»(ref-494125-S07322871642012081000000) .
- 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-494127-S26204886792012081000000) . Refer to Confirmation Driving Pattern [P2195]. Refer to «CONFIRMATION DRIVING PATTERN»(ref-494125-S04973705642012081000000) .
- 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-494127-S16851746442012081000000) . Refer to Confirmation Driving Pattern [P0037]. Refer to «CONFIRMATION DRIVING PATTERN»(ref-494127-S39476802102012081000000) .
CHECK MODE PROCEDURE
HINT
Techstream only
Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect 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 ON to ACC or off while in check mode. Before changing modes, always check and note any DTCs and freeze frame data.
Scheme 32
- CHECK MODE PROCEDURE Check and ensure the following conditions: Battery voltage is 11 V or higher. Throttle valve is fully closed. Shift lever is in P or N. A/C switch is 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 / Utility / Check Mode. Switch the ECM from normal mode to check mode. Check that the MIL flashes as shown in the illustration. Start the engine. Check that 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 or stops fuel injection.
| DTC Code | Component | Fail-Safe Operation | Fail-Safe Deactivation Condition |
|---|---|---|---|
| P0011 P0015 | VVT system | Idle up (Control of combustion worsening) Stopping fuel-cut control | Pass condition detected |
| P0031 P0032 P101D | Air fuel ratio sensor heater | The ECM turns off the air fuel ratio sensor heater. | Ignition switch off |
| P0037 P0038 P102D | Heated oxygen sensor heater | The ECM turns off the heated oxygen sensor heater. | Ignition switch off |
| P0102 P0103 | Mass air flow meter | The ECM calculates ignition timing according to the engine speed and throttle valve position. | Pass condition detected |
| P0112 P0113 | Intake air temperature sensor | The ECM estimates the intake air temperature to be 20°C (68°F). | Pass condition detected |
| P0115 P0117 P0118 | Engine coolant temperature sensor | The 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 P1607 P2102 P2103 P2111 P2112 P2118 P2119 P2135 | Electronic throttle control system | The ECM cuts off throttle actuator current and the throttle valve is returned to a 6° throttle position by the return spring. The ECM then adjusts the engine output by controlling fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal angle to allow the vehicle to continue at minimal speed*1. | Pass condition detected and then ignition switch turned off |
| P0300 P0301 P0302 P0303 P0304 *2 | Fuel injector assembly Electronic throttle control system | When a catalyst-damaging misfire occurs (MIL blinking), the following fail-safe operation is performed for catalyst overheat malfunction prevention. Under a low load and at a low engine speed: - Fuel cut is performed on the malfunctioning cylinder. Under a high load and at a high engine speed: - Throttle valve opening angle control is performed. - Fuel cut is performed on all cylinders or the malfunctioning cylinder. | Pass condition detected and then ignition switch turned off |
| P0327 P0328 | Knock sensor | The ECM sets the ignition timing to maximum retard. | Ignition switch off |
| P0351 P0352 P0353 P0354 | Ignition coil assembly | The ECM cuts the fuel. | Pass condition detected |
| P2120 P2121 P2122 P2123 P2125 P2127 P2128 P2138 | Accelerator pedal position sensor | The 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 is closed and the engine idles. | Pass condition detected and then ignition switch turned off |
| P2237 P2238 P2239 P2252 P2253 | Air Fuel Ratio Sensor | Air fuel ratio feedback control is stopped. Current to the air fuel ratio sensor heater is cut. | 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.