Engine Control (diagnostic Codes (p0201-p0657) Lexus IS F I

DESCRIPTION

The D-4S system has two fuel injection methods. One is the in-cylinder direct injection method that directly injects pressurized fuel into the combustion chamber. The other is the intake port injection method. The ECM determines which fuel injection method to use in accordance with the engine conditions. For the in-cylinder direction injection method, the 2 injector drivers in the engine compartment operate the fuel injectors (for direct injection) at high speeds.

Each injector driver receives fuel injection request signals from the ECM and converts the signals to high voltage / high current injector operation signals to operate the fuel injectors (for direct injection). The fuel injection sequence occurs in the following order: No. 1, No. 8, No. 7, No. 3, No. 6, No. 5, No. 4, No. 2. The ECM monitors each injector driver at all times. If drivers or injectors are malfunctioning, the injector driver sends fuel injector operation condition fail signals (INJ1 to INJ4) to the ECM.

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INJ1 TO INJ4 SIGNAL GROUP

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208

P062D, P062E

TYPICAL MALFUNCTION THRESHOLDS

P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208

P062D, P062E

Scheme 269

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Idle the engine for 15 seconds or more [B].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0201,P0202, P0203, P0204, P0205, P0206, P0207, P0208, P062D, P062E.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

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INSPECTION PROCEDURE

HINT

1. If the current from the INJ relay is cut because DTC P062D is stored, DTC P1235 will be stored even if the fuel pump for high pressure (Bank 1) is normal.
2. If the current from the INJ2 relay is cut because DTC P062E is stored, DTC P1236 will be stored even if the fuel pump for high pressure (Bank 2) is normal.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

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1. CLEAR DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If DTC P062D is stored, current to the INJ relay will be shut off. If DTC P062E is stored, current the INJ2 relay will be shut off. NEXT: Go to next step
2. INSPECT INJECTOR DRIVER (POWER SOURCE OF ECU) Disconnect the injector driver connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage (No. 1) Tester Connection Switch Condition Specified Condition E27-3 (+B) - Engine ground Engine switch on (IG) 11 to 14 V E27-2 (+B2) - Engine ground Engine switch on (IG) 11 to 14 V Standard Voltage (No. 2) Tester Connection Switch Condition Specified Condition E68-3 (+B) - Engine ground Engine switch on (IG) 11 to 14 V E68-2 (+B2) - Engine ground Engine switch on (IG) 11 to 14 V Result Result Proceed To OK A NG (for injector driver No. 1) B NG (for injector driver No. 2) C Reconnect the injector driver connector. C --> See step 12 B --> See step 7 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) Disconnect injector driver connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (No. 1) Tester Connection Condition Specified Condition E27-6 (GND) - Body ground Always Below 1 ohms E27-5 (GND2) - Body ground Always Below 1 ohms Standard Resistance (No. 2) Tester Connection Condition Specified Condition E68-6 (GND) - Body ground Always Below 1 ohms E68-5 (GND2) - Body ground Always Below 1 ohms Reconnect the injector driver connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) OK: Go to next step
4. CHECK FOR DTC Interchange the injector driver No. 1 and No. 2. Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . NOTE: Before deleting the DTCs, write them down. Start the engine. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Display (DTC Output) Proceed to DTCs do not change A DTCs change (change in malfunctioning cylinder or injector driver code) B B --> See step 17 A: Go to next step
5. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR DIRECT INJECTION) Disconnect the injector driver (No. 1) connector. Disconnect the injector driver (No. 2) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (No. 1) Tester Connection Condition Specified Condition G3-1 (IJ1+) - G3-3 (IJ1-) 20°C (68°F) 2.01 to 2.43 ohms G3-2 (IJ7+) - G3-4 (IJ7-) 20°C (68°F) 2.01 to 2.43 ohms G5-1 (IJ5+) - G5-3 (IJ5-) 20°C (68°F) 2.01 to 2.43 ohms G5-2 (IJ3+) - G5-4 (IJ3-) 20°C (68°F) 2.01 to 2.43 ohms Standard Resistance (No. 2) Tester Connection Condition Specified Condition G4-1 (IJ4+) - G4-3 (IJ4-) 20°C (68°F) 2.01 to 2.43 ohms G4-2 (IJ6+) - G4-4 (IJ6-) 20°C (68°F) 2.01 to 2.43 ohms G6-1 (IJ2+) - G6-3 (IJ2-) 20°C (68°F) 2.01 to 2.43 ohms G6-2 (IJ8+) - G6-4 (IJ8-) 20°C (68°F) 2.01 to 2.43 ohms Reconnect the injector driver connectors. NG --> See step 11 OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (INJECTOR DRIVER - ECM) Disconnect the ECM connectors. Disconnect the injector driver connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition E26-6 (IJF1) - E4-13 (INJ1) Always Below 1 ohms E26-5 (IJF2) - E4-12 (INJ2) Always Below 1 ohms E67-6 (IJF3) - E4-15 (INJ3) Always Below 1 ohms E67-5 (IJF4) - E4-14 (INJ4) Always Below 1 ohms E26-4 (IJT1) - E6-20 (#1) Always Below 1 ohms E67-2 (IJT2) - E6-10 (#2) Always Below 1 ohms E67-3 (IJT3) - E6-9 (#3) Always Below 1 ohms E26-2 (IJT4) - E6-19 (#4) Always Below 1 ohms E67-4 (IJT5) - E6-8 (#5) Always Below 1 ohms E26-1 (IJT6) - E6-18 (#6) Always Below 1 ohms E26-3 (IJT7) - E6-17 (#7) Always Below 1 ohms E67-1 (IJT8) - E6-7 (#8) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E26-6 (IJF1) or E4-13 (INJ1) - Body ground Always 10 kohms or higher E26-5 (IJF2) or E4-12 (INJ2) - Body ground Always 10 kohms or higher E67-6 (IJF3) or E4-15 (INJ3) - Body ground Always 10 kohms or higher E67-5 (IJF4) or E4-14 (INJ4) - Body ground Always 10 kohms or higher E26-4 (IJT1) or E6-20 (#1) - Body ground Always 10 kohms or higher E67-2 (IJT2) or E6-10 (#2) - Body ground Always 10 kohms or higher E67-3 (IJT3) or E6-9 (#3) - Body ground Always 10 kohms or higher E26-2 (IJT4) or E6-19 (#4) - Body ground Always 10 kohms or higher E67-4 (IJT5) or E6-8 (#5) - Body ground Always 10 kohms or higher E26-1 (IJT6) or E6-18 (#6) - Body ground Always 10 kohms or higher E26-3 (IJT7) or E6-17 (#7) - Body ground Always 10 kohms or higher E67-1 (IJT8) or E6-7 (#8) - Body ground Always 10 kohms or higher Reconnect the injector driver connector and ECM connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJECTOR DRIVER - ECM) OK --> See step 18
7. CHECK FUSE (INJ FUSE) Remove the INJ fuse from the integration relay. Measure the resistance according the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition INJ fuse Always Below 1 ohms Reinstall the INJ fuse. NG --> REPLACE FUSE (INJ FUSE) OK: Go to next step
8. INSPECT INTEGRATION NO. 1 RELAY (INJ RELAY) Remove the integration relay from the engine room No. 2 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2C-1 - 2A-4 When no battery voltage applied to terminals 2A-3 and 2A-1 10 kohms or higher When battery voltage applied to terminals 2A-3 and 2A-1 Below 1 ohms Reinstall the integration relay. NG --> See step 19 OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (INJ RELAY - EFI MAIN RELAY) Remove the integration relay from the engine room No. 2 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2A-8 - 2A-1 Always Below 1 ohms Reinstall the integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - INJ RELAY) OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (INJ RELAY - ECM) Remove the integration relay from the engine room No. 2 relay block. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition INJ Relay (2A-3) - A5-4 (IREL) Always Below 1 ohms Reinstall the integration relay. Reconnect the ECM Connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ RELAY - ECM) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ RELAY - P/I-B FUSE)
11. INSPECT FUEL INJECTOR ASSEMBLY FOR DIRECT INJECTION Check the resistance of the fuel injector for direct injection. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information) NG --> See step 20 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJECTOR DRIVER - ECM)
12. CHECK FUSE (INJ2 FUSE) Remove the INJ2 fuse from the engine room No. 2 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition INJ2 fuse Always Below 1 ohms Reinstall the INJ2 fuse. NG --> REPLACE FUSE (INJ2 FUSE) OK: Go to next step
13. INSPECT RELAY (INJ2 RELAY) Remove the INJ2 relay from the engine room No. 2 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 When no battery voltage applied to terminals 1 and 2 10 kohms or higher When battery voltage applied to terminals 1 and 2 Below 1 ohms Reinstall the INJ2 relay. NG --> REPLACE RELAY (INJ2 RELAY) OK: Go to next step
14. CHECK HARNESS AND CONNECTOR (INJ2 RELAY POWER SOURCE) Remove the INJ2 relay from the engine room No. 2 relay block. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition INJ2 relay (1) - Body ground Engine switch on (IG) 11 to 14 V Reinstall the INJ2 relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ2 RELAY - EFI MAIN RELAY) OK: Go to next step
15. CHECK HARNESS AND CONNECTOR (INJ2 RELAY - ECM) Remove the INJ2 relay from the engine room No. 2 relay block. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition INJ2 relay (1) - A5-4 (IREL) Always Below ohms Reinstall the INJ2 relay. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ2 RELAY - ECM) OK: Go to next step
16. CHECK HARNESS AND CONNECTOR (INJ2 RELAY - BATTERY) Remove the INJ2 relay from the engine room No. 2 relay block. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition 2 - Body ground Engine switch on (IG) 11 to 14 V Reinstall the INJ2 relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ2 RELAY - BATTERY) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INJ2 RELAY - E/G-B FUSE)
17. REPLACE INJECTOR DRIVER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
18. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
19. REPLACE INTEGRATION NO. 1 RELAY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
20. REPLACE FUEL INJECTOR ASSEMBLY FOR DIRECT INJECTION. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)

When the engine is cranked, a signal is sent from the main body ECU STSW terminal to the ECM STSW terminal. Then voltage travels from the ECM STAR terminal through the park/neutral position switch to the ST relay coil. The STAR terminal also sends a signal to the STA terminal. When the STA signal and NE signal are input to the ECM, the ECM internal transistor Tr1 turns ON, which causes power to be supplied to the C/OPN relay coil (C/OPN relay turns ON). As a result, the F/PMP relay actuates, which causes the fuel pump to operate. If the engine is operating and NE signals are being output, the ECM internal transistor Tr1 is kept ON (C/OPN relay turns ON), and the fuel pump will continue operating. The fuel pump has a high and low speed setting. When the engine is starting or operating with a heavy load, the ECM internal transistor Tr2 turns OFF so that the F/PMP relay will close and the fuel pump will operates at the high speed setting. When the engine is idling or operating with a light load, Tr2 turns ON, operating the F/PMP relay and causing current to flow through the fuel pump resistor to the fuel pump. This operates the fuel pump at the low speed setting.

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1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. After starting the engine, wait 5 seconds [B].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0230.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [B] again.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 281

This troubleshooting procedure is based on the premise that engine cranking is possible. If the engine does not crank, proceed to the Problem Symptoms Table. Refer to PROBLEM SYMPTOMS TABLE .

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

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1. CHECK FUEL PUMP OPERATION Check if there is pressure in the fuel inlet hose. HINT: If there is fuel pressure, you will hear the sound of fuel flowing. NG --> See step 5 OK: Go to next step
2. CHECK ECM (FRP VOLTAGE) Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A5-6 (FPR) - E6-1 (E1) STA signal ON 11 to 14 V A5-6 (FPR) - E6-1 (E1) STA signal OFF 0 to 3 V NG --> See step 3 OK --> See step 6
3. INSPECT F/PMP RELAY Remove the F/PMP relay from the engine room No. 2 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 4 When no battery applied to terminals 1 and 2 Below 1 ohms 3 - 4 When battery voltage is applied to terminals 1 and 2 10 kohms or more Reinstall the F/PMP relay. NG --> REPLACE F/PMP RELAY OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (F/PMP RELAY - ECM) Remove the F/PMP relay from the engine room No. 2 relay block. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition F/PMP relay (2) - A5-6 (FPR) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition F/PMP relay (2) or A5-6 (FPR) - Body Ground Always 10 kohms or higher Reinstall the F/PMP relay. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - ECM) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - C/OPN RELAY)
5. GO TO FUEL PUMP CONTROL CIRCUIT. Refer to «Fuel Pump Control Circuit»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p1604-u0101-circuit-tests)
6. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbons concentration levels can cause an increase in exhaust emission levels. High concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire count. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds.

If the misfire exceeds the threshold levels and may cause emission deterioration, the ECM illuminates the MIL and sets a DTC.

If DTCs that indicate misfires are set for different cylinders, but DTC P0300 is not set, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only set when several misfiring cylinders are detected at the same time.

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The ECM illuminates the MIL and sets a DTC when either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic)

1. Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfire count (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs once.
2. After the first 1000 crankshaft revolutions, an excessive misfire count (approximately 20 to 60 misfires per 1000 crankshaft revolutions) occurs 4 times in sequential crankshaft revolutions.

The ECM flashes the MIL and sets a DTC when either one of the following conditions, which could cause the three-way catalytic converter damage, is detected (2 trip detection logic)

1. In every 200 crankshaft revolutions at a high engine rpm, the threshold misfire percentage is recorded once.
2. In every 200 crankshaft revolutions at a normal engine rpm, the threshold misfire percentage is recorded 3 times.

MISFIRE

MONITOR PERIOD OF EMISSION-RELATED MISFIRE

MONITOR PERIOD OF CATALYST-DAMAGING MISFIRE (MIL BLINKS)

MONITOR PERIOD OF EMISSION-RELATED MISFIRE

MONITOR PERIOD OF CATALYST-DAMAGING MISFIRE (MIL BLINKS)

MONITOR RESULT

Refer to Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Record the DTC(s) and freeze frame data.
5. Using the Techstream, switch the ECM from normal mode to check mode. Refer to «CHECK MODE PROCEDURE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-mode-procedure) .
6. Read the misfire counts of each cylinder (Cylinder #1 Misfire Count to Cylinder #8 Misfire Count) with the engine in an idling condition. If any misfire count is displayed, skip the following confirmation driving pattern.
7. Drive the vehicle several times with the conditions, such as engine rpm and engine load, shown in Misfire RPM and Misfire Load in the Data List. HINT: In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, using the Misfire RPM and Misfire Load in the Data List. Engine RPM Duration Idling 8 minutes or more 1000 4 minutes or more 2000 2 minutes or more 3000 1.5 minute or more
8. Check whether misfires have occurred by checking DTCs and freeze frame data. HINT: Do not turn the engine switch off until the stored DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data will be erased.
9. Record the DTC(s), freeze frame data and misfire counts.
10. Turn the engine switch off and wait for at least 5 seconds.

HINT

1. If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
3. If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
4. If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem: There was insufficient fuel in the tank. Improper fuel is used. The spark plugs have been contaminated. The problem requires further diagnosis.
5. After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #8 Misfire Count).
6. Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after finishing repairs.
7. For 8 cylinder engine, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine speed. If misfires occur only in high engine speed areas, only DTC P0300 is set. In the event of DTC P0300 being present, perform the following operations: Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Start the engine and conduct the confirmation driving pattern. Read the misfire count of each cylinder or DTC(s) using the Techstream. Repair the cylinder(s) that has a high misfiring count or is indicated by the DTC. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.
8. When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be Rich (-20% or less) or Lean (+20% or more).
9. When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfire have occurred only while warming up the engine.
10. An extremely unbalanced drive wheel which causes body vibration may cause misfire DTCs to be detected.

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1. CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO MISFIRE DTCS) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output A DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 and other DTCs are output B HINT: If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308 are output, troubleshoot those DTCs first. B --> See step 45 A: Go to next step
2. CHECK PCV HOSE (HOSE CONNECTIONS) OK PCV hose is connected correctly and is not damaged. NG --> See step 46 OK: Go to next step
3. READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Misfire / Misfire RPM and Misfire Load. Read and note the Misfire RPM and Misfire Load values. HINT: The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred. NEXT: Go to next step
4. CHECK MISFIRE COUNT OF PORT INJECTION Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port. (Procedure "A") Allow the engine to idle. Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count. If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B") Move the shift lever to D. Repeat procedure "A" to "B" above. Monitor all of the misfire count values that are displayed on the tester. Result Misfire count Proceed to There are no misfire counts A 1 or 2 cylinders have misfire counts B 3 cylinders or more have misfire counts B B --> See step 9 A: Go to next step
5. CHECK MISFIRE COUNT OF DIRECT INJECTION Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. (Procedure "A") Allow the engine to idle. Monitor all of the misfire count values that are displayed on the Techstream. (1)Enter the following menus: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count Cylinder #8 Misfire Count. If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B") Move the shift lever to D. Repeat procedure "A" to "B" above. Monitor all of the misfire count values that are displayed on the Techstream. Result Misfire Count Proceed to Port Direct There are no misfire counts 1 or 2 cylinders have misfire counts A There are no misfire counts 3 cylinders or more have misfire counts B There are no misfire counts There are no misfire counts C C --> See step 7 B --> See step 32 A --> See step 6
6. REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
7. CHECK MISFIRE COUNT Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Enter the following menus: Powertrain / Engine / Data List / Misfire RPM, Misfire Load, Cylinder #1 Misfire Count to Cylinder #8 Misfire Count and Injection Way. Drive the vehicle with Misfire RPM and Misfire Load. Monitor all of the misfire count values or DTCs and Injection Way displayed on the Techstream. Result Misfire count Injection Way Proceed to There are no misfire counts - A 1 or 2 cylinders have misfire counts Port or Either B 3 cylinders or more have misfire counts Port or Either C 1 or 2 cylinders have misfire counts Direct D 3 cylinders or more have misfire counts Direct E E --> See step 32 D --> See step 54 C --> See step 20 B --> See step 10 A --> See step 8
8. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
9. CHECK MISFIRE COUNT Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. (Procedure "A") Allow the engine to idle. Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count. If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B") Move the shift lever to D. Repeat procedure "A" to "B" above. Monitor all of the misfire count values that are displayed on the Techstream. Result Misfire Count Proceed to Port Direct 1 or 2 cylinders have misfire counts 1 or 2 cylinders have misfire counts A 3 cylinders or more have misfire counts 3 cylinders or more have misfire counts B 1 or 2 cylinders have misfire counts There are no misfire counts C 3 cylinders or more have misfire counts There are no misfire counts D D --> See step 30 C --> See step 47 B --> See step 20 A: Go to next step
10. CHECK SPARK PLUG Remove the ignition coil and the spark plug of the misfiring cylinder. Measure the spark plug electrode gap. Maximum Electrode Gap for Used Spark Plug 1.4 mm (0.0551 in.) If the gap is grater than the maximum, replace the spark plug. Electrode Gap for New Spark Plug 1.0 to 1.1 mm (0.0394 to 0.0433 in.) Check the electrode for carbon deposits. RECOMMENDED SPARK PLUG Manufacturer Product DENSO FK20HBR11 NOTE: If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap. Reinstall the ignition coil and spark plug. NG --> See step 48 OK: Go to next step
11. CHECK FOR SPARK AND IGNITION Remove the ignition coil assemblies. Remove the spark plugs. Install the spark plug to the ignition coil. Disconnect the 2 fuel delivery pipe connectors. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers. Attach the spark plug assembly to the cylinder head cover. Crank the engine for less than 2 seconds and check the spark. OK Sparks jump across the electrode gap. Reconnect the 4 connectors with wire harness locks to the 2 injector drivers. Reconnect the 2 fuel delivery pipe connectors. Reinstall the spark plugs. Reinstall the ignition coil assemblies. NG --> See step 35 OK: Go to next step
12. CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER) Measure the cylinder compression pressure of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 9»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION OK: Go to next step
13. CHECK VALVE CLEARANCE (MISFIRING CYLINDER) Check the valve clearance. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> See step 49 OK: Go to next step
14. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK No leaks in the intake system. NG --> See step 50 OK: Go to next step
15. CHECK VALVE TIMING Remove the cylinder head cover bank 1 and bank 2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration. OK Timing marks on camshaft timing gears are aligned as shown in the illustration. Reinstall the cylinder head covers. NG --> See step 51 OK: Go to next step
16. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Check the fuel pressure (low pressure side). Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . NG --> See step 39 OK: Go to next step
17. READ VALUE USING TECHSTREAM (COOLANT TEMP) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the Data List twice, when the engine is both cold and warmed up. Standard With cold engine Same as ambient air temperature. With warm engine Between 75°C and 95°C (167°F and 203°F). NG --> See step 52 OK: Go to next step
18. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY Inspect the mass air flow meter sub-assembly. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NG --> See step 53 OK --> See step 19
19. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
20. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK No leaks in the intake system. NG --> See step 50 OK: Go to next step
21. CHECK VALVE TIMING Remove the cylinder head cover bank 1 and bank 2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration. OK Timing marks on camshaft timing gears are aligned as shown in the illustration. Reinstall the cylinder head covers. NG --> See step 51 OK: Go to next step
22. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Check the fuel pressure (low pressure side). Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . NG --> See step 39 OK: Go to next step
23. READ VALUE USING TECHSTREAM (COOLANT TEMP) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the Data List twice when the engine is both cold and warmed up. Standard With cold engine Same as ambient air temperature. With warm engine Between 75°C and 95°C (167°F and 203°F). NG --> See step 52 OK: Go to next step
24. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY Inspect the mass air flow meter sub-assembly. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NG --> See step 53 OK: Go to next step
25. CHECK SPARK PLUG Remove the ignition coil and the spark plug of the misfiring cylinder. Measure the spark plug electrode gap. Maximum Electrode Gap for Used Spark Plug 1.4 mm (0.0551 in.) If the gap is grater than the maximum, replace the spark plug. Electrode Gap for New Spark Plug 1.0 to 1.1 mm (0.0394 to 0.0433 in.) Check the electrode for carbon deposits. RECOMMENDED SPARK PLUG Manufacturer Product DENSO FK20HBR11 NOTE: If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap. Reinstall the ignition coil and spark plug. NG --> See step 48 OK: Go to next step
26. CHECK FOR SPARK AND IGNITION Remove the ignition coil assemblies. Remove the spark plugs. Install the spark plug to the ignition coil. Disconnect the 2 fuel delivery pipe connectors. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers. Attach the spark plug assembly to the cylinder head cover. Crank the engine for less than 2 seconds and check the spark. OK Sparks jump across the electrode gap. Reconnect the 4 connectors with wire harness locks to the 2 injector drivers. Reconnect the 2 fuel delivery pipe connectors. Reinstall the spark plugs. Reinstall the ignition coil assemblies. NG --> See step 35 OK: Go to next step
27. CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER) Measure the cylinder compression pressure of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 9»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION OK: Go to next step
28. CHECK VALVE CLEARANCE (MISFIRING CYLINDER) Check the valve clearance. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> See step 49 OK --> See step 29
29. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
30. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Check the fuel pressure (low pressure side). Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . NG --> See step 39 OK --> See step 31
31. REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information__removal)
32. CHECK FUEL PRESSURE SENSOR Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. While revving the engine, check that the fuel pressure fluctuates. Standard Idling 3500 to 4500 kPa 2000 rpm (No load) 7000 to 9000 kPa HINT: The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up. NG --> See step 41 OK: Go to next step
33. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection way / Direct. HINT: The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up. Read the value. Enter the following menus: Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4). Result Item Proceed to Fuel Pump Duty (D4) Short FT #1 + Long FT #1 Short FT #2 + Long FT #2 40% or more -20% or less -20% or less A 10% or less +20% or more +20% or more A 40% or more +20% or more +20% or more B 10% or less -20% or less -20% or less C 10% to 40% - - D D --> See step 54 C --> See step 19 B --> See step 34 A --> See step 34
34. REPLACE FUEL PRESSURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
35. CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Change the installed spark plug to a spark plug that functions normally. Perform a spark test. WARNING: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. Install the spark plug to the ignition coil and connect the ignition coil connector. Disconnect the 2 fuel delivery pipe connectors.. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers. Ground the spark plug. Check if sparks occur while the engine is being cranked. OK Sparks jump across the electrode gap. NG --> See step 37 OK --> See step 36
36. REPLACE SPARK PLUG. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
37. CHANGE TO NORMAL IGNITION COIL AND SPARK OF MISFIRING CYLINDER Change the installed ignition coil to a ignition coil that functions normally. Perform a spark test. WARNING: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. Install the spark plug to the ignition coil and connect the ignition coil connector. Disconnect the 2 fuel delivery pipe connectors.. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers. Ground the spark plug. Check if sparks occur while the engine is being cranked. OK Sparks jump across the electrode gap. NG --> See step 19 OK --> See step 38
38. REPLACE IGNITION COIL ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
39. CHECK FUEL PUMP OPERATION Check the fuel pump operation. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . NG --> See step 55 OK: Go to next step
40. CHECK FUEL LINE Check the fuel line for leakage and blockage. NG --> REPAIR OR REPLACE FUEL LINE OK --> CHECK AND REPLACE FUEL SYSTEM (FUEL PUMP REGULATOR, FUEL FILTER)
41. CHECK MISFIRE COUNT Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. Allow the engine to idle. Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count. If no misfire counts occur for any of the cylinders, perform the following procedure: Move the shift lever to D. Monitor all of the misfire count values that are displayed on the Techstream. Result Misfire Count Proceed to No misfire counts, or misfire counts occur randomly in all cylinders A Misfire counts occur in particular cylinder B B --> See step 56 A: Go to next step
42. INSPECT INJECTOR DRIVER Turn the engine switch off. Replace the No. 1 and No. 2 injector drivers with normal ones from another vehicle. NOTE: Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged. Connect the Techstream to the DLC3. Start the engine. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Perform the driving test. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output A DTC is not output B B --> See step 57 A: Go to next step
43. INSPECT FUEL RELIEF VALVE ASSEMBLY Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. Record the Fuel Press value. Turn the engine switch off. Wait for 10 seconds. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the Techstream. Result Inspection Result Proceed to Fuel Press value drops A Fuel Press value is maintained B B --> See step 58 A --> See step 44
44. REPLACE FUEL PUMP ASSEMBLY (HIGH PRESSURE). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
45. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)
46. REPAIR OR REPLACE PCV HOSE. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection)
47. REPLACE INJECTOR ASSEMBLY (MALFUNCTIONING CYLINDER). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information__removal)
48. REPLACE SPARK PLUG. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
49. ADJUST VALVE CLEARANCE. Refer to «ADJUSTMENT»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
50. REPAIR OR REPLACE INTAKE SYSTEM. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection)
51. ADJUST VALVE TIMING. Refer to «REASSEMBLY - Step 24»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
52. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
53. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
54. REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION MALFUNCTIONING CYLINDER). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
55. REPAIR OR REPLACE FUEL PUMP CONTROL CIRCUIT. Refer to «Fuel Pump Control Circuit»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p1604-u0101-circuit-tests)
56. REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
57. REPLACE INJECTOR DRIVER (NO. 1 AND NO. 2). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
58. REPLACE FUEL RELIEF VALVE ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)

A flat type knock sensor (non-resonant type) has a structure that can detect vibrations between approximately 6 kHz and 15 kHz.

Knock sensors are fitted onto the engine block to detect engine knocking.

The knock sensor contains a piezoelectric element which generates a voltage when it becomes deformed.

The voltage is generated when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

HINT

When any of DTCs P0327, P0328, P032C, P032D, P0332, P0333, P033C and P033D are set, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the engine switch is turned off.

Reference: Inspection using an oscilloscope

Scheme 289

The correct waveform is as shown.

MONITOR DESCRIPTION

The knock sensor, located on the cylinder block, detects spark knock. When spark knock occurs, the piezoelectric element of the sensor vibrates. When the ECM detects a voltage in this frequency range, it retards the ignition timing to suppress the spark knock.

The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the knock sensor signal level is too low for more than 10 seconds, or if the knock sensor output voltage is outside the normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.

KNOCK SENSOR RANGE CHECK (LOW VOLTAGE): P0327, P032C, P0332 AND P033C

KNOCK SENSOR RANGE CHECK (HIGH VOLTAGE): P0328, P032D, P0333 AND P033D

COMPONENT OPERATING RANGE

Scheme 290

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and wait 10 seconds [B].
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0327, P0328, P032C, P032D, P0332, P0333, P033C or P033D.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] and [E].
12. Idle the engine for 5 minutes [D].
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result [E]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 291

HINT

1. DTCs P0327 and P0328 are for the bank 1 sensor 1 knock sensor circuit.
2. DTCs P032C and P032D are for the bank 1 sensor 2 knock sensor circuit.
3. DTCs P0332 and P0333 are for the bank 2 sensor 1 knock sensor circuit.
4. DTCs P033C and P033D are for the bank 2 sensor 2 knock sensor circuit.
5. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 292

Scheme 293

1. INSPECT KNOCK SENSOR Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E6-26 (KNK1) - E6-33 (EKNK) 20°C (68°F) 120 to 280 kohms E6-25 (KNK2) - E6-32 (EKN2) 20°C (68°F) 120 to 280 kohms E6-24 (KNK3) - E6-31 (EKN3) 20°C (68°F) 120 to 280 kohms E6-23 (KNK4) - E6-30 (EKN4) 20°C (68°F) 120 to 280 kohms Result Result Proceed to NG A OK B Reconnect the ECM connector. B --> See step 3 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (KNOCK SENSOR - ECM) Disconnect the knock sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition G16-2 - E6-26 (KNK1) Always Below 1 ohms G16-1 - E6-33 (EKNK) Always Below 1 ohms G12-2 - E6-25 (KNK2) Always Below 1 ohms G12-1 - E6-32 (EKN2) Always Below 1 ohms G14-2 - E6-24 (KNK3) Always Below 1 ohms G14-1 - E6-31 (EKN3) Always Below 1 ohms G9-2 - E6-23 (KNK4) Always Below 1 ohms G9-1 - E6-30 (EKN4) Always Below 1 ohms Standard Resistance (Check for Open) Tester Connection Condition Specified Condition G16-2 or E6-26 (KNK1) - Body ground Always 10 kohms or higher G16-1 or E6-33 (EKNK) - Body ground Always 10 kohms or higher G12-2 or E6-25 (KNK2) - Body ground Always 10 kohms or higher G12-1 or E6-32 (EKN2) - Body ground Always 10 kohms or higher G14-2 or E6-24 (KNK3) - Body ground Always 10 kohms or higher G14-1 or E6-31 (EKN3) - Body ground Always 10 kohms or higher G9-2 or E6-23 (KNK4) - Body ground Always 10 kohms or higher G9-1 or E6-30 (EKN4) - Body ground Always 10 kohms or higher Reconnect the knock sensor connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 5
3. INSPECT ECM Disconnect the knock sensor connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition G16-2 - G16-1 Engine switch on (IG) 4.5 to 5.5 V G12-2 - G12-1 Engine switch on (IG) 4.5 to 5.5 V G14-2 - G14-1 Engine switch on (IG) 4.5 to 5.5 V G9-2 - G9-1 Engine switch on (IG) 4.5 to 5.5 V Reconnect the knock sensor connector. NG --> See step 4 OK --> See step 6
4. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
5. REPLACE KNOCK SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)

The crankshaft position sensor consists of a crank angle sensor plate and magnetic resistance element type sensor. The crank angle sensor plate has 34 teeth at 10° intervals (2 teeth are missing for detecting top dead center), and is installed to the rear end of the crankshaft. The crank position sensor outputs 34 rotation signals per engine revolution. The ECM uses the G2 signal to distinguish between the cylinders, and uses the NE signal to detect the crankshaft position and engine speed.

Scheme 294

1. Reference: Inspection using an oscilloscope. HINT: The correct waveform is as shown. The wavelength becomes shorter as the engine speed increases. NE+ stands for the crankshaft position sensor signal. Item Content Terminal NE+ - NE- Equipment Setting 5 V/DIV., 20 msec./DIV. Condition Cranking or idling

If there is no signal from the crankshaft position sensor despite the engine revolving, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 4 seconds, the ECM sets a DTC.

ALL

P0335 CASE 1

P0335 Case 2

P0337, P0038 CRANKSHAFT POSITION SENSOR RANGE CHECK (LOW VOLTAGE, HIGH VOLTAGE)

P0335 CASE 1

P0335 Case 2

P0337 CRANKSHAFT POSITION SENSOR RANGE CHECK (LOW VOLTAGE)

P0338 CRANKSHAFT POSITION SENSOR RANGE CHECK (HIGH VOLTAGE)

Scheme 295

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Idle the engine for 20 seconds or more [B].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0335, P0337, P0338 or P0339.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 296

HINT

1. If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
2. Check the engine speed. The engine speed can be checked by using the Techstream. To check, follow the operation below: Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Engine Speed. The engine speed may be indicated as zero despite the engine revolving normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed, if the crankshaft position sensor output voltage is insufficient.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 297

Scheme 298

1. READ VALUE USING TECHSTREAM (ENGINE SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Engine Speed. Star the engine. Read the values displayed on the Techstream while the engine is running. Standard Correct values are displayed. HINT: To check the engine speed change, display the graph on the Techstream. If the engine does not start, check the engine speed while cranking. If the engine speed indicated on the Techstream remains zero (0), there may be an open or short in the crankshaft position sensor circuit. Result Result Proceed to NG A OK B B --> See step 9 A: Go to next step
2. INSPECT CRANKSHAFT POSITION SENSOR (SENSOR POWER SOURCE) Disconnect the crankshaft position sensor connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition z4-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.0 V Reconnect the crankshaft position sensor connector. NG --> See step 8 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Disconnect the crankshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition z4-1 (NE) - E3-27 (NE+) Always Below 1 ohms z4-2 (NE-) - E3-34 (NE-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition z4-1 (NE) or E3-27 (NE+) - Body ground Always 10 kohms or higher z4-2 (NE-) or E3-34 (NE-) - Body ground Always 10 kohms or higher Reconnect the crankshaft position sensor connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR) Check the crankshaft position sensor installation. OK Sensor is installed correctly. NG --> See step 10 OK: Go to next step
5. CHECK CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE) Check the teeth of the sensor plate. OK Sensor plate does not have any crack or deformation. NG --> See step 11 OK: Go to next step
6. REPLACE CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0335, P0337, P0338 AND/OR P0339) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Start the engine. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Display (DTC Output) Proceed to No output A P0335, P0337, P0338 and/or P0339 B HINT: If the engine does not start, replace the ECM. B --> See step 12 A --> END
8. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Disconnect the crankshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition z4-3 (VC) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher Reconnect the crankshaft position sensor connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 13
9. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
10. REPAIR OR REPLACE CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
11. REPLACE CRANKSHAFT ANGLE SENSOR ROTOR. Refer to «REMOVAL - Step 84»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
12. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
13. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The VVT sensors use a timing rotor (installed on each camshaft) and a magnetic resistance Element type VVT sensor. The timing rotor (camshaft) has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the VVT sensor magnetic resistance element varies, which causes its resistance to vary. This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs. As a result, the actual camshaft position is detected and the position is output to the ECM.

Scheme 299

1. Reference: Inspection using an oscilloscope

HINT

1. The correct waveform is as shown.
2. The wavelength becomes shorter as the engine speed increases.
3. VV1+ and VV2+ are the VVT sensor (for intake side) signals.

If no signal is transmitted by the VVT sensor despite the engine revolution, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 4 seconds, the ECM sets a DTC.

ALL

P0340 AND P0345

P0342, P0347, P0343, P0348

P0340 AND P0345: VVT SENSOR VERIFY PULSE INPUT

P0342 AND P0347: VVT SENSOR RANGE CHECK (LOW VOLTAGE)

P0343 AND P0348: VVT SENSOR RANGE CHECK (HIGH VOLTAGE)

Scheme 300

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Idle the engine for 10 seconds or more [B].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0340, P0342, P0343, P0345, P0347 or P0348.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
2. If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.

Scheme 301

Scheme 302

Scheme 303

1. CHECK ECM TERMINAL VOLTAGE Inspect the ECM using an oscilloscope. While the engine is idling, check the waveform between the terminals of the ECM connector. Standard Voltage Tester Connection Condition Specified Condition E4-25 (VV1+) - E4-33 (VV1-) Engine idling Correct waveform appears as shown E5-19 (VV2+) - E5-29 (VV2-) Result Result Proceed to NG A OK B B --> See step 9 A: Go to next step
2. CHECK VVT SENSOR FOR INTAKE SIDE (SENSOR POWER SOURCE) Disconnect the VVT sensor for intake side connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition E30-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.0 V E70-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.0 V Reconnect the VVT sensor connector. NG --> See step 8 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM) Disconnect the VVT sensor for intake side connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition E30-1 (VVL+) - E4-25 (VV1+) Always Below 1 ohms E30-2 (VVL-) - E4-33 (VV1-) Always Below 1 ohms E70-1 (VVR+) - E5-19 (VV2+) Always Below 1 ohms E70-2 (VVR-) - E5-29 (VV2-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E30-1 (VVL+) or E4-25 (VV1+) - Body ground Always 10 kohms or higher E30-2 (VVL-) or E4-33 (VV1-) - Body ground Always 10 kohms or higher E70-1 (VVR+) or E5-19 (VV2+) - Body ground Always 10 kohms or higher E70-2 (VVR-) or E5-29 (VV2-) - Body ground Always 10 kohms or higher Reconnect the VVT sensor connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK SENSOR INSTALLATION (VVT SENSOR FOR INTAKE SIDE) Check the VVT sensor installation. OK Sensor is installed correctly. NG --> See step 10 OK: Go to next step
5. CHECK INTAKE CAMSHAFT Check the teeth of the signal plate. OK Signal plate teeth do not have any cracks or deformation. NG --> See step 11 OK: Go to next step
6. REPLACE VVT SENSOR FOR INTAKE SIDE Replace the VVT sensor for intake side. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342, P0343, P0345, P0347 AND/OR P0348) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Start the engine. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Display (DTC Output) Proceed to No output A P0340, P0342, P0343, P0345, P0347 and/or P0348 B HINT: If the engine does not start, replace the ECM. B --> See step 12 A --> END
8. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM) Disconnect the VVT sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition E30-3 (VC) - E3-18 (VC) Always Below 1 ohms E70-3 (VC) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E30-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher E70-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher Reconnect the VVT sensor connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 13
9. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
10. REPAIR OR REPLACE VVT SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
11. REPLACE INTAKE CAMSHAFT. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
12. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
13. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

HINT

1. These DTCs indicate malfunctions relating to the primary circuit.
2. If DTC P0351 is set, check the No. 1 ignition coil circuit.
3. If DTC P0352 is set, check the No. 2 ignition coil circuit.
4. If DTC P0353 is set, check the No. 3 ignition coil circuit.
5. If DTC P0354 is set, check the No. 4 ignition coil circuit.
6. If DTC P0355 is set, check the No. 5 ignition coil circuit.
7. If DTC P0356 is set, check the No. 6 ignition coil circuit.
8. If DTC P0357 is set, check the No. 7 ignition coil circuit.
9. If DTC P0358 is set, check the No. 8 ignition coil circuit.

A direct ignition system is used on this vehicle.

The direct ignition system is a ignition system in which each cylinder is ignited by one ignition coil and spark plug is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is applied directly to each spark plug. The sparks of the spark plugs pass from the center electrode to the ground electrodes.

The ECM determines the ignition timing and transmits the ignition signals (IGT) to each cylinder. Using the IGT signal, the ECM turns the power transistor inside the igniter on and off. The power transistor, in turn, switches on and off the current to the primary coil. When the current to the primary coil is cut off, a powerful voltage is generated in the secondary coil. This voltage is applied to the spark plugs, causing them to spark inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back an ignition confirmation signal (IGF) to the ECM, for each cylinder ignition.

Scheme 304

Scheme 305

1. Reference: Inspection using an oscilloscope.
2. While cranking or idling the engine, check the waveform between terminals IGT (1 to 8) and E1, and IGF1, IGF2 and E1 of the ECM connectors. HINT: The wavelength becomes shorter as the engine speed increases. Item Content Terminal CH1: IGT1, IGT4, IGT6 or IGT7 - E1 CH2: IGF1 - E1 CH1: IGT2, IGT3, IGT5 or IGT8 - E1 CH2: IGF2 - E1 Equipment Setting 2 V/DIV. 20 msec./DIV. Condition Cranking or idling

Scheme 306

If the ECM does not receive any IGF signals despite transmitting the IGT signal, it interprets this as a fault in the igniter and sets a DTC.

If the malfunction is not repaired successfully, a DTC is set 1 second after the engine is next started.

Scheme 307

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Idle the engine for 10 seconds or more [B].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0351, P0352, P0353, P0354, P0355, P0356, P0357 or P0358.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 308

Scheme 309

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 310

Scheme 311

Scheme 312

1. READ OUT PUT DTC Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to One of DTCs P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358 is output. A Some of DTCs P0351, P0352, P0353, P0354, P0355, P0356, P0358 are output. B B --> See step 7 A: Go to next step
2. PERFORM SIMULATION TEST Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Change the arrangement of the ignition coils (with igniters). NOTE: Do not change the location of the connectors. Perform a simulation test. Result Display (DTC Output) Proceed to Same DTCs (that have been cleared) A Other DTCs B B --> See step 8 A: Go to next step
3. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE) Disconnect the ignition coil connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition E22-1 (+B) - E22-4 (GND) Engine switch on (IG) 11 to 14 V E32-1 (+B) - E32-4 (GND) Engine switch on (IG) 11 to 14 V E23-1 (+B) - E23-4 (GND) Engine switch on (IG) 11 to 14 V E33-1 (+B) - E33-4 (GND) Engine switch on (IG) 11 to 14 V E24-1 (+B) - E24-4 (GND) Engine switch on (IG) 11 to 14 V E35-1 (+B) - E35-4 (GND) Engine switch on (IG) 11 to 14 V E78-1 (+B) - E78-4 (GND) Engine switch on (IG) 11 to 14 V E72-1 (+B) - E72-4 (GND) Engine switch on (IG) 11 to 14 V Reconnect the ignition coil connector. NG --> See step 7 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM) Disconnect the ignition coil connector. Disconnect the ECM connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition E22-3 (IGT1) - E5-27 (IGT1) Always Below 1 ohms E32-3 (IGT2) - E4-23 (IGT2) Always Below 1 ohms E23-3 (IGT3) - E5-26 (IGT3) Always Below 1 ohms E33-3 (IGT4) - E4-22 (IGT4) Always Below 1 ohms E24-3 (IGT5) - E5-25 (IGT5) Always Below 1 ohms E35-3 (IGT6) - E4-21 (IGT6) Always Below 1 ohms E78-3 (IGT7) - E5-24 (IGT7) Always Below 1 ohms E72-3 (IGT8) - E4-20 (IGT8) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E22-3 (IGT1) or E5-27 (IGT1) - Body ground Always 10 kohms or higher E32-3 (IGT2) or E4-23 (IGT2) - Body ground Always 10 kohms or higher E23-3 (IGT3) or E5-26 (IGT3) - Body ground Always 10 kohms or higher E33-3 (IGT4) or E4-22 (IGT4) - Body ground Always 10 kohms or higher E24-3 (IGT5) or E5-25 (IGT5) - Body ground Always 10 kohms or higher E35-3 (IGT6) or E4-21 (IGT6) - Body ground Always 10 kohms or higher E78-3 (IGT7) or E5-24 (IGT7) - Body ground Always 10 kohms or higher E72-3 (IGT8) or E4-20 (IGT8) - Body ground Always 10 kohms or higher Standard Resistance (Check for Open) Tester Connection Condition Specified Condition E22-2 (IGF1) - E5-32 (IGF1) Always Below 1 ohms E32-2 (IGF2) - E4-28 (IGF2) Always Below 1 ohms E23-2 (IGF2) - E4-28 (IGF2) Always Below 1 ohms E33-2 (IGF1) - E5-32 (IGF1) Always Below 1 ohms E24-2 (IGF2) - E4-28 (IGF2) Always Below 1 ohms E35-2 (IGF1) - E5-32 (IGF1) Always Below 1 ohms E78-2 (IGF1) - E5-32 (IGF1) Always Below 1 ohms E72-2 (IGF2) - E4-28 (IGF2) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E22-2 (IGF1) or E5-32 (IGF1) - Body ground Always 10 kohms or higher E32-2 (IGF2) or E4-28 (IGF2) - Body ground Always 10 kohms or higher E23-2 (IGF2) or E4-28 (IGF2) - Body ground Always 10 kohms or higher E33-2 (IGF1) or E5-32 (IGF1) - Body ground Always 10 kohms or higher E24-2 (IGF2) or E4-28 (IGF2) - Body ground Always 10 kohms or higher E35-2 (IGF1) or E5-32 (IGF1) - Body ground Always 10 kohms or higher E78-2 (IGF1) or E5-32 (IGF1) - Body ground Always 10 kohms or higher E72-2 (IGF2) or E4-28 (IGF2) - Body ground Always 10 kohms or higher Reconnect the ignition coil connector and ECM connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT ECM (IGT1, IGF1 SIGNAL) Connect the oscilloscope to ECM. Connect the CH1 to the terminal IGT (1 to 8) and E1. Connect the CH2 to the terminal IGF1, IGF2 and E1. Check the waveform according to the below. Item Content Terminal CH1: IGT1, IGT4, IGT6 or IGT7 - E1 CH2: IGF1 - E1 CH1: IGT2, IGT3, IGT5 or IGT8 - E1 CH2: IGF2 - E1 Equipment Setting 2 V/DIV. 20 msec./DIV. Condition Cranking or idling NG --> See step 9 OK: Go to next step
6. CHECK IF DTC OUTPUT RECURS Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Display (DTC Output) Proceed to P0351, P0352, P0353, P0354, P0355, P0356, P0357 and/or P0358 are output A No output B B --> See step 10 A --> See step 9
7. INSPECT IGNITION COIL ASSEMBLY (GROUND CIRCUIT) Disconnect the ignition coil connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E22-4 (GND) - Body ground Always Below 1 ohms E32-4 (GND) - Body ground Always Below 1 ohms E23-4 (GND) - Body ground Always Below 1 ohms E33-4 (GND) - Body ground Always Below 1 ohms E24-4 (GND) - Body ground Always Below 1 ohms E35-4 (GND) - Body ground Always Below 1 ohms E78-4 (GND) - Body ground Always Below 1 ohms E72-4 (GND) - Body ground Always Below 1 ohms Reconnect the ignition coil connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - GROUND) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - IG2 RELAY)
8. REPLACE IGNITION COIL ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
9. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
10. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)

The VVT sensors use a timing rotor (installed on each camshaft) and a magnetic resistance element type VVT sensor. The timing rotor (camshaft) has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the VVT sensor magnetic resistance element varies, which causes its resistance to vary. This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs. As a result, the actual camshaft position is detected and the position is output to the ECM.

Scheme 313

Reference: Inspection using an oscilloscope

HINT

1. The correct waveform is as shown.
2. The wavelength becomes shorter as the engine speed increases.
3. EV1+ and EV2+ stand for the VVT sensor (for exhaust side) signal. Item Content Terminal EV1+ - EV1- EV2+ - EV2- Equipment Setting 5 V/DIV., 20 msec./DIV. Condition Cranking or idling

If no signal is transmitted by the VVT sensor despite the engine revolution, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 4 seconds, the ECM sets a DTC.

ALL

P0365 AND P0390

P0367, P0392, P0368, P0393

P0365 AND P0390: VVT SENSOR VERIFY PULSE INPUT

P0367 AND P0392: VVT SENSOR RANGE CHECK (LOW VOLTAGE)

P0368 AND P0393: VVT SENSOR RANGE CHECK (HIGH VOLTAGE)

Scheme 314

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Idle the engine for 10 seconds or more [B].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0365, P0367, P0368, P0390, P0392 or P0393.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 315

Scheme 316

1. CHECK ECM TERMINAL VOLTAGE Inspect the ECM using an oscilloscope. While the engine is idling, check the waveform between the terminals of the ECM connector. Standard Voltage Tester Connection Condition Specified Condition E3-26 (EV1+) - E3-33 (EV1-) Engine idling Correct waveform appears as shown E6-22 (EV2+) - E6-29 (EV2-) Engine idling Correct waveform appears as shown Result Result Proceed to NG A OK B B --> See step 9 A: Go to next step
2. CHECK VVT SENSOR (SENSOR POWER SOURCE) Disconnect the VVT sensor connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition E34-3 (VC2) - Body ground Engine switch on (IG) 4.5 to 5.0 V E25-3 (VC2) - Body ground Engine switch on (IG) 4.5 to 5.0 V Reconnect the VVT sensor connector. NG --> See step 8 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM) Disconnect the VVT sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition E34-1 (EX+) - E3-26 (EV1+) Always Below 1 ohms E34-2 (EX-) - E3-33 (EV1-) Always Below 1 ohms E25-1 (EX+) - E6-22 (EV2+) Always Below 1 ohms E25-2 (EX-) - E6-29 (EV2-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E34-1 (EX+) or E3-26 (EV1+) - Body ground Always 10 kohms or higher E34-2 (EX-) or E3-33 (EV1-) - Body ground Always 10 kohms or higher E25-1 (EX+) or E6-22 (EV2+) - Body ground Always 10 kohms or higher E25-2 (EX-) or E6-29 (EV2-) - Body ground Always 10 kohms or higher Reconnect the VVT sensor connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK SENSOR INSTALLATION (VVT SENSOR FOR EXHAUST SIDE) Check the VVT sensor installation. OK Sensor is installed correctly. NG --> See step 10 OK: Go to next step
5. CHECK EXHAUST CAMSHAFT Check the teeth of the signal plate. OK Signal plate teeth do not have any cracks or deformation. NG --> See step 11 OK: Go to next step
6. REPLACE VVT SENSOR FOR EXHAUST SIDE Replace the VVT sensor for exhaust side. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Start the engine. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Display (DTC Output) Proceed to No output A P0365, P0367, P0368, P0390, P0392 and/or P0393 B HINT: If the engine does not start, replace the ECM. B --> See step 12 A --> END
8. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM) Disconnect the VVT sensor for exhaust side connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition E34-3 (VC2) - E3-18 (VC) Always Below 1 ohms E25-3 (VC2) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E34-3 (VC2) or E3-18 (VC) - Body ground Always 10 kohms or higher E25-3 (VC2) or E3-18 (VC) - Body ground Always 10 kohms or higher Reconnect the VVT sensor connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 13
9. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
10. REPAIR OR REPLACE VVT SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
11. REPLACE EXHAUST CAMSHAFT. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
12. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
13. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The ECM uses sensors mounted in front of and behind the three way catalytic converter to monitor its efficiency.

The first sensor, the air fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to the ECM.

In order to detect any deterioration in the three way catalytic converter, the ECM calculates the oxygen storage capacity of the three way catalytic converter. This calculation is based on the voltage output of the heated oxygen sensor while performing active air fuel ratio control, rather than the conventional detecting method, which uses the locus ratio.

The oxygen storage capacity value is an indication of the oxygen storage capacity of the three way catalytic converter. When the vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 15 to 20 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If a rich-lean cycle of the heated oxygen sensor is long, the oxygen storage capacity becomes greater. There is a direct correlation between the oxygen storage capacities of the heated oxygen sensor and the three way catalytic converter.

The ECM uses the oxygen storage capacity value to determine the state of the three way catalytic converter. If any deterioration has occurred, it illuminates the MIL and sets a DTC.

HINT

1. Bank 1 refers to the bank that includes No. 1 cylinder.
2. Bank 2 refers to the bank that does not include No. 1 cylinder.
3. Sensor 1 refers to the sensor closest to the engine assembly.
4. Sensor 2 refers to the sensor farthest away from the engine assembly.

Scheme 317

Refer to Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

HINT

Performing this confirmation pattern will activate the catalyst monitor. This is very useful for verifying the completion of a repair.

Scheme 318

1. (a) Connect the Techstream to the DLC3.
2. (b) Turn the engine switch on (IG).
3. (c) Turn the Techstream on.
4. (d) Clear DTCs (if set). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
5. (e) Enter the following menus: Powertrain / Engine / Monitor.
6. (f) Check that Catalyst / Status2 is Incomplete.
7. (g) Start the engine and warm it up [A].
8. (h) Drive the vehicle at between 50 mph and 80 mph (80 km/h and 128 km/h) for at least 10 minutes [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
9. (i) Those items will change to Complete as Catalyst monitor operates.
10. (j) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending; then check if any DTCs (any pending DTCs) are set.

HINT

If Catalyst does not change to Complete and any pending DTCs fail to set, extend the driving time.

CONDITIONING FOR SENSOR TESTING

HINT

Perform the operation with the engine speeds and time durations described below prior to checking the waveforms of the air fuel ratio and heated oxygen sensors. This is in order to activate the sensors sufficiently to obtain the appropriate inspection results.

Scheme 319

1. (a) Connect the Techstream to the DLC3 [A].
2. (b) Start the engine and warm it up with all the accessories switched OFF, until the engine coolant temperature stabilizes [B].
3. (c) Run the engine at an engine speed of between 1000 rpm and 2000 rpm for at least 3 minutes [C].
4. (d) While running the engine at 2000 rpm for 2 seconds and 1000 rpm for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream [D].

HINT

1. If either of the voltage outputs of the air fuel ratio or heated oxygen sensor does not fluctuate, or either of the sensors makes a noise, the sensor may be malfunctioning.
2. If the voltage outputs of both the sensors remain lean or rich, the air fuel ratio may be extremely lean or rich. In such cases, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
3. If the three way catalytic converter has deteriorated, the heated oxygen sensor (located behind the three way catalytic converter) voltage output fluctuates up and down frequently, even under normal driving conditions (active air fuel ratio control is not performed).

Scheme 320

HINT

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the Techstream.

1. Connect the Techstream to the DLC3.
2. Start the engine and turn the Techstream on.
3. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
4. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
5. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume.)
6. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.

HINT

1. The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Note. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case Air Fuel Ratio Sensor (Sensor 1) Output Voltage Heated Oxygen Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit 3 Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit 4 Injector assembly Fuel pressure Gas leaks from exhaust system (Air fuel ratio extremely rich or lean)

Scheme 321

Scheme 322

Scheme 323

1. Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.
2. To display the graph, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420 AND/OR P0430) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Display (DTC Output) Proceed to P0420 and/or P0430 A P0420 and/or P0430 and other DTCs B HINT: If any DTCs other than P0420 or P0430 are output, troubleshoot those DTCs first. B --> See step 9 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (AIR FUEL RATIO CONTROL) Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor. Perform the Control the Injection Volume for A/F Sensor operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has maximum output delay of approximately 20 seconds. Standard Tester Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) +25% Rich Less than 3.1 AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) -12.5% Lean More than 3.4 O2S B1S2 or O2S B2S2 (Heated oxygen) +25% Rich More than 0.55 O2S B1S2 or O2S B2S2 (Heated oxygen) -12.5% Lean Less than 0.4 Result Status AFS Voltage B1S1 or AFS Voltage B2S1 Status O2S B1S2 or O2S B2S2 Air Fuel Ratio Condition and Air Fuel Ratio and Heated Oxygen Sensors Conditions Misfire Main Suspected Trouble Area Proceed to Lean/Rich Lean/Rich Normal - Three-Way Catalytic Converter (TWC) Gas leaks from exhaust system A Lean Lean/Rich Air fuel ratio sensor malfunction - Air fuel ratio sensor B Rich Lean/Rich Air fuel ratio sensor malfunction - Air fuel ratio sensor Lean/Rich Lean Heated oxygen sensor malfunction - Heated oxygen sensor Gas leaks from exhaust system C Lean/Rich Rich Heated oxygen sensor malfunction - Heated oxygen sensor Gas leaks from exhaust system Lean Lean Actual air fuel ratio lean May occur Extremely rich or lean actual air fuel ratio Gas leaks from exhaust system D Rich Rich Actual air fuel ratio rich - Extremely rich or lean actual air fuel ratio Gas leaks from exhaust system Lean: During Control the Injection Volume for A/F Sensor, the A/F sensor output voltage (AFS) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V. Rich: During Control the Injection Volume for A/F Sensor, the AFS is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V. Lean/Rich: During Control the Injection Volume for A/F sensor of the Active Test, the output voltage of the heated oxygen sensor alternates correctly. D --> See step 8 C --> See step 7 B --> See step 10 A: Go to next step
3. INSPECT EXHAUST GAS LEAK OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK: Go to next step
4. CHECK DTC OUTPUT (DTC P0420 AND/OR P0430) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Display (DTC Output) Proceed to P0420 A P0430 B P0420 and P0430 A and B B --> See step 6 A: Go to next step
5. REPLACE EXHAUST MANIFOLD SUB-ASSEMBLY LH (TWC: FRONT CATALYST) Replace the exhaust manifold sub-assembly LH (TWC: front catalyst). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/exhaust/#exhaust-service-information) . NEXT --> See step 11
6. REPLACE EXHAUST MANIFOLD SUB-ASSEMBLY RH (TWC: FRONT CATALYST) Replace the exhaust manifold sub-assembly RH (TWC: front catalyst). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/exhaust/#exhaust-service-information) . NEXT --> See step 11
7. INSPECT FOR EXHAUST GAS LEAK OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK --> See step 12
8. INSPECT FOR EXHAUST GAS LEAK OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK --> See step 13
9. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)
10. CHECK AND REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
11. REPLACE FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/exhaust/#exhaust-service-information)
12. REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
13. CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO. Refer to «DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2); DTC P1170: Port Injector Fuel Performance; DTC P117B: Direct Injector Fuel Performance»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193)

DTC SUMMARY

HINT

The reference orifice is located inside the canister pump module.

The description can be found in the EVAP (Evaporative Emission) System. Refer to DESCRIPTION .

HINT

Unit expressions

1. [kPa-a (mmHg-a)] denotes the absolute pressure.
2. [kPa-g (mmHg-g)] denotes the gauge pressure (relative pressure).
3. On the Techstream, convert the unit of measurement according to the inspection procedure.

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

5 hours* after the engine switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT

*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the engine switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the engine switch is turned off, the monitor check starts 2.5 hours later.

*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

Scheme 324

The leak detection pump creates negative pressure through the reference orifice. When the system is normal, the EVAP pressure is 724 to 752 mmHg* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM will illuminate the MIL and set a DTC if this malfunction is detected in consecutive drive cycles.

*: Typical value.

Scheme 325

"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa (2.14 mmHg) in 60 seconds.

Refer to Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

Scheme 326

Note. The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on.
6. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [A].
7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
8. Read the pending DTC [B]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P043E, P043F, P2401, P2402 or P2419.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

The description can be found in the EVAP (Evaporative Emission) System. Refer to DESCRIPTION .

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

The two monitors, key-off and purge flow, are used to detect malfunctions relating to DTC P0441. The key-off monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours* after the engine switch is turned off. The purge flow monitor runs while the engine is running.

Scheme 327

Scheme 328

Scheme 329

1. KEY-OFF MONITOR 5 hours* after the engine switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure. HINT: *: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the engine switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the engine switch is turned off, the monitor check starts 2.5 hours later. Sequence Operation Description Duration - ECM activation Activated by soak timer 5, 7 or 9.5 hours after engine switch turned off. - A Atmospheric pressure measurement Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to register atmospheric pressure. If pressure in EVAP system not between 70 kPa-a and 110 kPa-a (525 mmHg-a and 825 mmHg-a), ECM cancels EVAP system monitor. 60 seconds B First reference pressure measurement In order to determine reference pressure, leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if leak detection pump and vent valve operate normally. 60 seconds C EVAP system pressure measurement Vent valve turned ON (closed) to shut EVAP system. Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then measured. Write down measured value as it will be used in leak check. If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor. 15 minutes * D Purge VSV monitor Purge VSV opened and then EVAP system pressure measured by ECM. Large increase indicates normality. 10 seconds E Second reference pressure measurement After second reference pressure measurement, leak check performed by comparing first and second reference pressure. If stabilized system pressure higher than second reference pressure, ECM determines that EVAP system leaking. 60 seconds - Final check Atmospheric pressure measured and then monitoring result recorded by ECM. - *: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize. Purge VSV stuck open In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The EVAP system pressure is then measured by the ECM using the canister pressure sensor. If the stabilized system pressure is higher than [second reference pressure x 0.2], the ECM interprets this as the purge VSV (Vacuum Switching Valve) being stuck open. The ECM illuminates the MIL and sets the DTC (2 trip detection logic). Purge VSV stuck closed In operation D, the canister pressure sensor measures the EVAP system pressure. The pressure measurement for the purge VSV monitor is begun when the purge VSV is turned ON (open) after the EVAP leak check. When the measured pressure indicates an increase of 0.3 kPa-g (2.25 mmHg-g) or more, the purge VSV is functioning normally. If the pressure does not increase, the ECM interprets this as the purge VSV being stuck closed. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).
2. PURGE FLOW MONITOR The purge flow monitor consists of the two step monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.

1. The 1st monitor While the engine is running and the purge VSV is ON (open), the ECM monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd monitor.
2. The 2nd monitor The vent valve is turned ON (closed) and the EVAP pressure is then measured. If the variation in the pressure is less than 0.3 kPa-g (2.25 mmHg-g), the ECM interprets this as the purge VSV being stuck closed, illuminates the MIL and sets DTC P0441 (2 trip detection logic).

Atmospheric pressure check

In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ECM.

KEY-OFF MONITOR

PURGE FLOW MONITOR

PURGE VSV STUCK OPEN

PURGE VSV STUCK CLOSED

PURGE FLOW

Refer to Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

Scheme 330

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and wait 15 minutes or more [B].
7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
8. Read the pending DTC [C]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0441.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit NOTE: The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).
12. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
13. Turn the engine switch off and wait for 30 seconds.
14. Turn the engine switch on (IG).
15. Turn the Techstream on.
16. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [D].
17. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
18. Read the pending DTC [E]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
19. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
20. Input the DTC: P0441.
21. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [D] again.
22. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
23. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
24. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

The canister pressure sensor is built into the canister pump module.

The description can be found in the EVAP (Evaporative Emission) System. Refer to DESCRIPTION .

Scheme 331

1. DTC P0451: Canister pressure sensor noise or fixed/flat If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as noise from the canister pressure sensor, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC. Alternatively, if the sensor voltage output does not change for 10 seconds, the ECM interprets this as the sensor being fixed/flat, and stops the monitor. The ECM then illuminates the MIL and sets the DTC. (Both the malfunctions are detected by 2 trip detection logic).
2. DTC P0452: Canister pressure sensor voltage low If the canister pressure sensor voltage output [pressure] is below 0.45 V [42.1 kPa-a (315.9 mmHg-a)], the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
3. DTC P0453: Canister pressure sensor voltage high If the canister pressure sensor voltage output [pressure] is more than 4.9 V [123.8 kPa-a (928.4 mmHg-a)] , the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).

P0451: NOISE MONITOR

P0451: FIXED/FLAT MONITOR

P0452 AND P0453

P0451: CANISTER PRESSURE SENSOR NOISE

P0451: CANISTER PRESSURE SENSOR FIXED/FLAT

P0452: CANISTER PRESSURE SENSOR LOW VOLTAGE

P0453: CANISTER PRESSURE SENSOR HIGH VOLTAGE

Scheme 332

Note. The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine / Data List / Intake Air.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
5. Turn the engine switch off and wait for 30 seconds.
6. Turn the engine switch on (IG) and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [A].
8. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
9. Read the pending DTC [B]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0451, P0452 or P0453.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 333

Note. When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel cap. Do not disassemble the canister pump module. The Techstream is required to conduct the following diagnostic troubleshooting procedure.

Scheme 334

1. CONFIRM DTC AND EVAP PRESSURE Connect the Techstream to the DLC3. Turn the engine switch on (IG) (do not start the engine). Turn the Techstream ON. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Enter the following menus: Powertrain / Engine / Data List / EVAP / Vapor Pressure Pump. Read the EVAP (Evaporative Emission) pressure displayed on the Techstream. Result Display (DTC Output) Test Result Suspected Trouble Area Proceed to P0451 - Canister pressure sensor C P0452 Less than 45 kPa-a (430 mmHg-a) Wire harness/connector (ECM - canister pressure sensor) Canister pressure sensor Short in ECM circuit A P0453 More than 120 kPa-a (900 mmHg-a) Wire harness/connector (ECM - canister pressure sensor) Canister pressure sensor Open in ECM circuit B C --> See step 4 B --> See step 5 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Turn the engine switch off. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Test Result Suspected Trouble Area Proceed to E3-31 (PPMP) - Body ground Always Below 10 ohms Wire harness/connector (ECM - canister pressure sensor) Short in canister pressure sensor circuit A 10 kohms or higher Wire harness/connector (ECM - canister pressure sensor) Short in ECM circuit B Reconnect the ECM connector. B --> See step 8 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Disconnect the canister pump module connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Test Result Suspected Trouble Area Proceed to E3-31 (PPMP) - Body ground Always 10 kohms or higher Short in canister pressure sensor circuit A Below 10 ohms Short in wire harness/connector (ECM - canister pressure sensor) B Reconnect the canister pump module connector. Reconnect the ECM connector. B --> See step 7 A --> See step 6
4. GO TO EVAP SYSTEM. Refer to «EVAP System»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p1604-u0101-circuit-tests)
5. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Disconnect the canister pump module connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition Q49-4 (VCC) - Body ground Engine switch on (IG) 4.5 to 5.5 V Q49-3 (VOUT) - Body ground Engine switch on (IG) 4.5 to 5.5 V Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Q49-2 (SGND) - Body ground Always Below 100 ohms Result Test Result Suspected Trouble Area Proceed to Voltage and resistance within standard ranges Open in canister pressure sensor circuit A Voltage and resistance outside standard ranges Open in wire harness/connector (ECM - canister pressure sensor) B Reconnect the canister pump module connector. B --> See step 7 A: Go to next step
6. REPLACE CANISTER ASSEMBLY Replace the canister assembly. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/auxiliary-emission-control-systems/#emission-control-service-information) . NOTE: When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. NEXT --> See step 9
7. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM) NEXT --> See step 9
8. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
9. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Wait for at least 60 seconds. Enter the following menus: Powertrain / Engine / Trouble Codes. HINT: If no pending DTCs are displayed on the Techstream, the repair has been successfully completed. NEXT --> COMPLETED

The description can be found in the EVAP (Evaporative Emission) System. Refer to DESCRIPTION .

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

HINT

Unit expressions

1. [kPa-a (mm Hg-a)] denotes the absolute pressure.
2. [kPa-g (mm Hg-g)] denotes the gauge pressure (relative pressure).
3. On the Techstream, convert the unit of measurement according to the inspection procedure.

5 hours* after the engine switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT

*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the engine switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the engine switch is turned off, the monitor check starts 2.5 hours later.

*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

Scheme 335

1. (a) P0455: EVAP gross leak In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second reference pressure x 0.32] (near atmospheric pressure), the ECM determines that the EVAP system has a large leakage, illuminates the MIL and sets the DTC (2 trip detection logic).
2. (b) P0456: EVAP very small leak In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than the second reference pressure, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets the DTC (2 trip detection logic).

P0455 (PATTERN A), P0456

P0455 (PATTERN B)

P0455: EVAP GROSS LEAK

P0456: EVAP SMALL LEAK

Refer to Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

Scheme 336

Note. The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on.
6. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [A].
7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
8. Read the pending DTC [B]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0455 or P0456.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of these pulse signals.

Scheme 337

The ECM assumes that the vehicle is being driven when the transmission counter gear indicates more than 300 rpm and over 30 seconds have passed since the park/neutral position switch was turned OFF. If there is no signal from the vehicle speed sensor with these conditions satisfied, the ECM concludes that the vehicle speed sensor is malfunctioning. The ECM will turn on the MIL and a DTC will be set.

Scheme 338

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Drive the vehicle at 15 mph (24 km/h) or more for a total of 30 seconds or more [B]. WARNING: When performing the confirmation driving pattern, obey all speed and traffic laws.
8. Stop the vehicle.
9. Enter the following menus: Powertrain / Engine / Trouble Codes.
10. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P0500.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [B] again.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
16. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 339

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 340

1. READ VALUE USING TECHSTREAM (VEHICLE SPEED) Drive the vehicle check whether the operation of the speedometer in the combination meter is normal. HINT: The vehicle speed sensor is operating normally if the speedometer reading is normal. If the speedometer does not operate, check it by following the procedure described in speedometer malfunction. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Vehicle Speed. Drive the vehicle. Read the value displayed on the Techstream. OK Vehicle speeds displayed on the Techstream and speedometer display are equal. NG --> See step 2 OK --> See step 5
2. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM) Inspect the combination meter assembly using an oscilloscope. More the shift lever to N. Jack up the vehicle. Turn the engine switch on (IG). Measure the voltage between the terminal of the combination meter and body ground while the while is turned slowly. Standard Voltage Tester Connection Switch Condition Specified Condition J34-5 (+S) - Body ground Engine switch on (IG) Voltage generated intermittently HINT: The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly. NG --> See step 4 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM) Disconnect the combination meter connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition J34-5 (+S) - A5-24 (SPD) Always Below 1 ohms Reconnect the combination meter connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM) Disconnect the combination meter connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Short) Tester Connection Condition Specified Condition J34-5 (+S) or A5-24 (SPD) - Body ground Always 10 kohms or higher Reconnect the combination meter connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 7
5. CHECK INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
6. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
7. REPLACE COMBINATION METER ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/gauges-instrument-panels/#meter-gauge-display-service-information)

The stop light switch is a duplex system that transmits two signals: STP and ST1-. These two signals are used by the ECM to monitor whether or not the brake system is working properly. If the signals, which indicate the brake pedal is being depressed and released, are detected simultaneously, the ECM interprets this as a malfunction in the stop light switch and sets the DTC.

HINT

The normal conditions are as shown in the table below. The signals can be read using the Techstream.

Scheme 341

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Depress and release the brake pedal [B].
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0504.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [B] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 342

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 343

Scheme 344

Scheme 345

Scheme 346

1. READ VALUE USING TECHSTREAM (STP SIGNAL AND ST1- VOLTAGE) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Stop Light Switch. Check the STP signal when the brake pedal is depressed and released. Standard Brake Pedal Operation Specified Condition Depressed STP signal ON Released STP signal OFF Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A5-12 (ST1-) - E6-1 (E1) Brake pedal depressed Below 1.5 V Brake pedal released 7.5 to 14 V NG --> See step 2 OK --> See step 6
2. INSPECT STOP LIGHT SWITCH (POWER SOURCE) Disconnect the stop light switch. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A22-2 - Body ground Always 11 to 14 V A22-4 - Body ground Engine switch on (IG) 11 to 14 V Reconnect the stop light switch connector. NG --> See step 5 OK: Go to next step
3. INSPECT STOP LIGHT SWITCH ASSEMBLY Remove the stop light switch assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 1 - 2 Switch pin free Below 1 ohms 3 - 4 10 kohms or higher 1 - 2 Switch pin pushed in 10 kohms or higher 3 - 4 Below 1 ohms Reinstall the stop light switch assembly. NG --> See step 7 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) Disconnect the stop light switch connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition A22-1 - A5-13 (STP) Always Below 1 ohms A22-3 - A5-12 (ST1-) Always Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A22-1 or A5-13 (STP) - Body ground Always 10 kohms or higher A22-3 or A5-12 (ST1-) - Body ground Always Reconnect the stop light switch connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM) OK --> See step 8
5. INSPECT FUSE (STOP SW AND IGN FUSE) Remove the STOP SW fuse and IGN fuse from the cowl side junction block RH. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition STOP SW fuse Always Below 1 ohms IGN fuse Always Below 1 ohms Reinstall the STOP SW fuse and IGN fuse. NG --> REPLACE FUSE (STOP SW AND IGN FUSE) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH POWER SOURCE)
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
7. REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/exterior-lights/#lighting-exterior-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The idle speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position sensor, which detects the accelerator pedal position; 5) the ECM, which controls the electronic throttle control system. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

The ECM monitors the idle speed and idle air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the idle speed control system is malfunctioning if the following conditions are met

1. The learned idle air flow volume remains at the maximum or minimum 5 seconds during a driving cycle.
2. After driving at a vehicle speed of 6.25 mph (10 km/h) or more, the actual engine idle speed varies from the target idle speed by below -100 rpm or 150 rpm or more when the A/C and NSW are off, or below -100 rpm or 200 rpm or more when the A/C or NSW are on, 5 times or more during a driving cycle, the ECM illuminates the MIL and sets the DTC.

HINT

*: Threshold idle speed varies with engine load.

Scheme 347

Scheme 348

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or more) with all the accessories switched off [B].
7. Idle the engine for 10 minutes or more [C].
8. Accelerate the vehicle to 6.25 mph (10 km/h) or more, and then idle the engine [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
10. Read the pending DTC [E]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P0505.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, repeat step [D] 4 times, allowing 20 seconds or more between each repetition.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
16. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. The following conditions may also cause DTC P0505 to be set: The floor carpet overlapping onto the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open. The accelerator pedal being not fully released.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0505 is output A DTC P0505 and other DTCs are output B HINT: If any DTCs other than P0505 are output, troubleshoot those DTCs first. B --> See step 5 A: Go to next step
2. CHECK PCV HOSE (HOSE CONNECTIONS) Inspect the PCV hose connections. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK PCV hose is connected correctly and is not damaged. NG --> See step 6 OK: Go to next step
3. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. OK No leaks from intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
4. CHECK THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body assembly. And check that the throttle valve moves smoothly. OK Throttle valve is not contaminated with foreign objects and moves smoothly. NG --> See step 7 OK --> See step 8
5. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)
6. REPAIR OR REPLACE PCV HOSE. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection)
7. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

This monitor will run when the engine is started at -10 to 60°C (14 to 140°F) of the engine coolant temperature. The DTC will set after the engine idling for 13 seconds (2 trip detection logic).

The DTC is designed to monitor the idle air control at cold start. When the engine is started at lower than 60°C (140°F) of the engine coolant temperature, the ECM measures the accumulated mass air flow at the engine idling. If it does not reach the criteria within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

The electronic throttle control system controls the idle speed. The electronic throttle control system operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.

Note. When the negative (-) battery terminal is disconnected during inspection or repairs, the idle speed control learned values are cleared. Idle speed control learning needs to be performed before this DTC can be stored. To perform idle speed control learning, the engine must be warmed up by allowing it to idle for 5 minutes. For idle speed control learning to be successful, when the engine is started to warm it up. There must be at least 10 seconds of idling with the coolant temperature below 30 °C (86°F) before allowing it to continue running for the 5 minute learning period.

Scheme 349

Scheme 350

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
7. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).
8. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.
9. Idle the engine for 1 minute or more [B].
10. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
11. Read the pending DTC [C]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Input the DTC: P050A.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] and [B] again.
15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
16. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P050A is output A DTC P050A and other DTCs are output B HINT: If any DTCs other than P050A are output, troubleshoot those DTCs first. B --> See step 16 A: Go to next step
2. READ VALUE USING TECHSTREAM (FUEL TRIM) HINT: Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter. Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2. Read the values displayed on the Techstream at engine idle. Add together the Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values to obtain the total Fuel Trim. OK Total of Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values is between -20% and 20%. Result Result Proceed to NG A OK B B --> See step 12 A: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE MD VVT LINEAR) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2) / VVT-iE Aim Angle #1 and VVT Change Angle #1 or VVT-iE Aim Angle #2 and VVT Change Angle #2. Perform the Active Test operation with the engine speed at 1500 rpm. OK Active Test Movement Order Difference between "VVT-iE Aim Angle" and "VVT Change Angle" 0 deg --> 10 deg --> 20 deg --> 40 deg --> 10 deg --> 0 deg --> 10 deg --> END Within 5 DegFR NG --> See step 8 OK: Go to next step
4. CHECK PCV HOSE CONNECTIONS Inspect PCV hose connection. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK PCV hose is connected correctly and is not damaged. NG --> See step 9 OK: Go to next step
5. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK No leaks from intake system. NG --> See step 10 OK: Go to next step
6. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil. OK Air cleaner filter element is not excessively contaminated with dirt or oil. NG --> See step 11 OK: Go to next step
7. REPLACE MASS AIR FLOW METER Replace the mass air flow meter. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT --> See step 15
8. CHECK AND REPAIR VVT SYSTEM Check and repair VVT system. NEXT --> See step 15
9. REPAIR OR REPLACE PCV HOSE Repair or replace PCV hose. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . NEXT --> See step 15
10. REPAIR OR REPLACE INTAKE SYSTEM Repair or replace intake system. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . NEXT --> See step 15
11. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Replace air cleaner filter element sub-assembly. NEXT --> See step 15
12. CHECK THROTTLE VALVE Check for deposits around the throttle valve and throttle valve condition. OK No deposits around throttle valve and throttle valve moves smoothly. NG --> See step 14 OK: Go to next step
13. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT --> See step 15
14. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY Repair or replace throttle body assembly. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT --> See step 15
15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch off and wait for 30 seconds. Turn the engine switch on (IG) and turn the Techstream on. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P050A. Check the DTC judgment result. OK DTC judgment result is NORMAL. NEXT --> END
16. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)

This monitor will run when the engine is started at -10 to 60°C (14 to 140°F) of the engine coolant temperature. The DTC will set after the engine idling for 13 seconds (2 trip detection logic).

The DTC is designed to monitor the idle air control at cold start. When the engine is started at lower than 60°C (140°F) of the engine coolant temperature, the ECM measures the accumulated mass air flow at the engine idling. If it does not reach the criteria within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

The electronic throttle control system controls the idle speed. The electronic throttle control system operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.

Scheme 351

Scheme 352

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
7. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).
8. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.
9. Idle the engine for 1 minute or more [B].
10. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
11. Read the pending DTC [C]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Input the DTC: P050B.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] and [B] again.
15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
16. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. DTC P050B may be set when the engine shows the symptom as listed below. If necessary, check the trouble areas as listed below. Symptoms Factor Trouble Area Low idle speed at engine cold. Excessive engine friction Engine oil deterioration Drive belt tension A/C compressor Generator P/S pump Rough idle at engine cold. Abnormal combustion Fuel quality
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P050B is output A DTC P050B and other DTCs are output B HINT: If any DTCs other than P050B are output, troubleshoot those DTCs first. B --> See step 16 A: Go to next step
2. READ VALUE USING TECHSTREAM (FUEL TRIM) HINT: Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter. Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2. Read the values displayed on the Techstream at engine idle. Add together the Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values to obtain the total Fuel Trim. OK Total of Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values is between -20% and 20%. Result Result Proceed to NG A OK B B --> See step 12 A: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE MD VVT LINEAR) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2) / VVT-iE Aim Angle #1 and VVT Change Angle #1 or VVT-iE Aim Angle #2 and VVT Change Angle #2. Perform the Active Test operation with the engine speed at 1500 rpm. OK Active Test Movement Order Difference between "VVT-iE Aim Angle" and "VVT Change Angle" 0 deg --> 10 deg --> 20 deg --> 40 deg --> 10 deg --> 0 deg --> 10 deg --> END Within 5 DegFR NG --> See step 8 OK: Go to next step
4. CHECK PCV HOSE CONNECTIONS Inspect the PCV hose connections. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK PCV hose is connected correctly and is not damaged. NG --> See step 9 OK: Go to next step
5. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK No leaks from intake system. NG --> See step 10 OK: Go to next step
6. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil. OK Air cleaner filter element is not excessively contaminated with dirt or oil. NG --> See step 11 OK: Go to next step
7. REPLACE MASS AIR FLOW METER Replace the mass air flow meter. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT --> See step 15
8. CHECK AND REPAIR VVT SENSOR Check and repair VVT system. NEXT --> See step 15
9. REPAIR OR REPLACE PCV HOSE Repair or replace PCV hose. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . NEXT --> See step 15
10. REPAIR OR REPLACE INTAKE SYSTEM Repair or replace intake system. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . NEXT --> See step 15
11. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Replace the air cleaner filter element sub-assembly. NEXT --> See step 15
12. CHECK THROTTLE VALVE Check for deposits around the throttle valve and throttle valve condition. OK No deposits around throttle valve and throttle valve moves smoothly. NG --> See step 14 OK: Go to next step
13. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT --> See step 15
14. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY Repair or replace the throttle body assembly. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B) NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch off and wait for 30 seconds. Turn the engine switch on (IG) and turn the Techstream on. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P050B. Check the DTC judgment result. OK DTC judgment result is NORMAL. NEXT --> END
16. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)

The battery supplies electricity to the ECM even when the engine switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls below a minimum level, the stored ECM data is cleared and the ECM determines that there is a malfunction in the power supply circuit. When the engine is next started, the ECM will illuminate the MIL and sets the DTC.

HINT

If DTC P0560 is set, the ECM does not store other DTCs.

Scheme 353

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 5 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0560.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 354

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 355

Scheme 356

1. CHECK FUSE (EFI FUSE) Remove the EFI fuse from the engine room No. 2 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition EFI fuse Always Below 1 ohms Reinstall the EFI fuse. NG --> REPLACE FUSE (EFI FUSE) OK: Go to next step
2. INSPECT INTEGRATION NO. 1 RELAY Remove the integration relay from engine room relay block No. 2. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2A-5 - 2C-1 Always Below 1 ohms Reinstall the integration relay. NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY) Disconnect the cable from the battery negative terminal and positive terminal. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition A5-7 (BATT) - Battery positive terminal Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A5-7 (BATT) or Battery positive terminal - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the cable to the battery positive terminal and negative terminal. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - INTEGRATION RELAY) OK: Go to next step
4. INSPECT BATTERY Check that the battery is not depleted. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/charging-system/#charging-inspection) . OK Battery is not depleted. NG --> REPLACE BATTERY OK --> See step 6
5. REPLACE INTEGRATION NO. 1 RELAY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)

The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. It performs self diagnosis by internal "mirroring" of the main CPU and sub CPU to detect the Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standards, the ECM will illuminate the MIL and set a DTC immediately.

Scheme 357

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 16 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0604.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK DTC Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Connect the cable to the negative (-) battery terminal. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Turn the engine switch on (IG). Connect the Techstream to the DLC3. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Check for DTC. OK P0604 is not present. NG --> See step 3 OK --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from the CPUs are different and deviate from the standards, the ECM will illuminate the MIL and set the DTC immediately.

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 16 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0606.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

1. READ OUTPUT DTC (DTC P0606) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch to off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0606 is output B B --> See step 3 A --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The ECM continuously monitors its internal processors (CPUs), air fuel ratio sensor transistors and heated oxygen sensor transistors built into the ECM. This self-check ensures that the ECM is functioning properly. This is diagnosed by internal "mirroring" of the main and sub CPUs to detect processor errors. If outputs from the processors deviate from the standards, the ECM will illuminate the MIL and set the DTC immediately.

Note. An exhaust gas leak generates electrical noise in the heated oxygen sensor output. The ECM may interpret this as an heated oxygen sensor transistor malfunction and set P0607.

Scheme 358

1. Stop the engine for 30 minutes or more [A].
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and turn the Techstream on [B].
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
5. Turn the engine switch off and wait for 30 seconds.
6. Turn the engine switch on (IG) and turn the Techstream on [C].
7. Start the engine and wait 2 minutes [D].
8. Warm up the engine until the engine coolant temperature is 75°C (167°F) or higher [E].
9. Idle the engine for 1 minute [F].
10. Accelerate the vehicle to 50 mph (80 km/h) and stop the vehicle [G]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
11. Drive the vehicle at 35 to 50 mph (56 to 80 km/h) for 5 minutes or more [H]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
12. Enter the following menus: Powertrain / Engine / Trouble Codes.
13. Read the DTC [I]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Input the DTC: P0607, P0136, P0137, P0138, P0156, P0157 or P0158.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [E] through [H] again.
17. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
18. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
19. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 359

1. CHECK ANY OTHER DTCS OUTPUT Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0607 and P0136, P0137, P0138, P0156, P0157 or P0158 are output A DTC P0607 is output B B --> See step 3 A: Go to next step
2. INSPECT DTC (P0136,P0137,P0138,P0156,P0157 OR P0158) Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flow chart. HINT: If P0136 or P0156 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193) . Then proceed to "INSPECT ECM". If P0137or P0157 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193) . Then proceed to "INSPECT ECM". If P0138 or P0158 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193) . Then proceed to "INSPECT ECM". If DTC P0607 and P0136, P0137, P0138, P0156, P0157 or P0158 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or more). NEXT --> See step 6
3. CHECK FOR EXHAUST GAS LEAK Allow the engine to idle and rev the engine. Check for exhaust gas leaks around the heated oxygen sensor. If any exhaust gas leaks are present, repair it and proceed to "PERFORM CONFIRMATION DRIVING PATTERN". If no exhaust gas leaks are present, proceed to "PERFORM CONFIRMATION DRIVING PATTERN". HINT: If no exhaust gas leaks are present, a malfunction in the heated oxygen sensor circuit is suspected. If any exhaust gas leaks are present around the heated oxygen sensor, noise appears in the output voltage of the heated oxygen sensor. NEXT: Go to next step
4. PERFORM CONFIRMATION DRIVING PATTERN Clear the DTC. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Connect the Techstream to the DLC3. Warm up the engine until the engine coolant temperature becomes 75° (167°F) or more. Perform the driving pattern. Accelerate the vehicle until 50 mph (80 km/h) and stop the vehicle. Drive the vehicle by 38 to 50 mph (60 to 80 km/h) for 5 minutes or more. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0607 and P0136, P0137, P0138, P0156, P0157 or P0158 are output A DTC P0607 is output B DTC is not output C C --> See step 6 B --> See step 7 A: Go to next step
5. INSPECT DTC (P0136,P0137,P0138,P0156,P0157 OR P0158) Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flow chart. HINT: If P0136 or P0156 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193) . Then proceed to "INSPECT ECM". If P0137or P0157 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193) . Then proceed to "INSPECT ECM". If P0138 or P0158 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193) . Then proceed to "INSPECT ECM". If DTC P0607 and P0136, P0137, P0138, P0156, P0157 or P0158 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or more). NEXT: Go to next step
6. INSPECT ECM Clear the DTC. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Stop the engine and wait for 30 minutes. Connect the Techstream to the DLC3. Start the engine and allow it to idle for 2 minutes. Turn the tester on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0607 is output B B --> See step 7 A --> END
7. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The main CPU and sub CPU of the ECM perform data communication between each other. The main CPU monitors the communications and WDC pulses from the sub CPU. When the malfunction below is detected, the DTC is stored.

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 16 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P060A.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

1. READ OUTPUT DTC (DTC P060A) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch to off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P060A is output B B --> See step 3 A --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

This DTC is output when a communication error occurs in the ECM.

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 16 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P060B.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

1. READ OUTPUT DTC (DTC P060B) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch to off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P060B is output B DTC P060B and P0327, P0328, P032C, P032D, P0332, P0333, P033C, P033D are output C C --> See step 4 B --> See step 3 A --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
4. GO TO DTC (P0327, P0328, P032C, P032D, P0332, P0333, P033C and P033D). Refer to «DTC P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); DTC P0328: Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor); DTC P032C: Knock Sensor 3 Circuit Low; DTC P032D: Knock Sensor 3 Circuit High; DTC P0332: Knock Sensor 2 Circuit Low Input (Bank 2); DTC P0333: Knock Sensor 2 Circuit High Input (Bank 2); DTC P033C: Knock Sensor 4 Circuit Low Input; DTC P033D: Knock Sensor 4 Circuit High Input»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0201-p0657)

The ECM monitors the input signals of the accelerator pedal position sensor No. 1. When the input signals and control signals are deviated, the DTC is output.

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 16 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P060D.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

1. READ OUTPUT DTC (DTC P060D) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch to off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P060D is output B B --> See step 3 A --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The ECM monitors the signals of the throttle position sensor No. 1 and stop light switch. As the ECM monitors the input signals of the throttle position sensor No. 1 and the STP signals of the stop light switch, if the input signals and control signals are deviated, the DTC is output.

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 16 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P060E.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

1. READ OUTPUT DTC (DTC P060E) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch to off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P060E is output B B --> See step 3 A --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

While the engine is being cranked, positive battery voltage is applied to terminal STA of the ECM.

If the ECM detects the Starter Control (STA) signal while the vehicle is being driven, it determines that there is a malfunction in the STA circuit. The ECM then illuminates the MIL and sets the DTC.

This monitor runs when the vehicle is driven at 12.43 mph (20 km/h) for over 20 seconds.

Scheme 360

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Idle the engine for 5 seconds or more [B].
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [C]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0617.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] and [E].
12. Drive the vehicle at 15 mph (24 km/h) or more for 20 seconds or more [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Input the DTC: P0617.
15. Check the DTC judgment result [E]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
16. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 361

HINT

1. The following troubleshooting flowchart is based on the premise that the engine can crank normally. If the engine can not crank, proceed to the Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__problem-symptoms-table) .
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 362

1. READ VALUE USING TECHSTREAM (STARTER SIGNAL) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Starter Signal. Check the value displayed on the Techstream when the engine switch is turned on (IG) and the engine is started. OK Condition Techstream Display Engine switch on (IG) Close (Starter signal OFF) Engine started Open (Starter signal ON) NG --> See step 2 OK --> See step 3
2. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Inspect the park/neutral position switch. Disconnect the switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Shift Lever Position Specified Condition 4 - 5 P Below 1 ohms 4 - 5 N Below 1 ohms Reconnect the park/neutral position switch connector. NG --> See step 4 OK --> See step 5
3. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
4. REPLACE PARK/NEUTRAL POSITION SWITCH. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/automatic-trans/#automatic-transmission-service-information)
5. CHECK CRANKING HOLDING FUNCTION CIRCUIT. Refer to «Cranking Holding Function Circuit»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p1604-u0101-circuit-tests)

The ECM monitors its internal operation and it stores this DTC when it detects an internal malfunction.

The ECM monitors its internal operation. If the internal operation is malfunctioning, the ECM illuminates the MIL and stores a DTC.

Scheme 363

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 30 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P062F.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

1. READ OUTPUT DTC (DTC P062F) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read DTCs. RESULT Result Proceed to DTC is not output A DTC P062F is output B B --> See step 2 A --> See step 3
2. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
3. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)

DTC P0630 is set when the VIN is not stored in the ECM or the input VIN is not accurate. Input the VIN with the Techstream.

Scheme 364

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 5 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0630.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

1. READ DTC OUTPUT Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0630 is output A DTC P0630 and other DTCs are output B If any DTCs other than P0630 are output, troubleshoot those DTCs first. NOTE: If P0630 is set, the VIN must be input to the ECM using the Techstream. However, all DTCs are cleared automatically by the Techstream when inputting the VIN. If DTCs other than P0630 are set, check them first. B --> See step 3 A: Go to next step
2. INPUT VIN Input VIN. Refer to «REGISTRATION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__registration) . NEXT --> END
3. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)

The ECM monitors the output voltage to the throttle actuator. This self-check ensures that the ECM is functioning properly. The output voltage usually is 0 V when the engine switch is turned off. If the output voltage is higher than 7 V when the engine switch is turned off, the ECM will illuminate the MIL and set a DTC when the engine switch is turned on (IG).

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Wait 5 seconds or more.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
8. Read the DTC [B]. HINT: If a DTC is output, the system is malfunctioning. If a DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0657.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK DTC Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Turn the engine switch off. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG) for 10 seconds. Turn the engine switch off. Turn the engine switch on (IG). Connect the Techstream to the DLC3. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Check for DTC. OK P0657 is not present. NG --> See step 3 OK --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

See also:
• DTC CHECK / CLEAR
• INSPECTION
• REMOVAL
• PROBLEM SYMPTOMS TABLE
• Fuel Pump Control Circuit
• CHECKING MONITOR STATUS
• CHECK MODE PROCEDURE
• CHECK FOR INTERMITTENT PROBLEMS
• ON-VEHICLE INSPECTION - Step 9
• ON-VEHICLE INSPECTION
• ON-VEHICLE INSPECTION - Step 2
• REMOVAL
• DIAGNOSTIC TROUBLE CODE CHART
• REMOVAL
• DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2); DTC P1170: Port Injector Fuel Performance; DTC P117B: Direct Injector Fuel Performance
• REMOVAL
• REMOVAL
• REMOVAL
• ON-VEHICLE INSPECTION
• PRECAUTION
• REMOVAL
• REGISTRATION
• DTC P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); DTC P0328: Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor); DTC P032C: Knock Sensor 3 Circuit Low; DTC P032D: Knock Sensor 3 Circuit High; DTC P0332: Knock Sensor 2 Circuit Low Input (Bank 2); DTC P0333: Knock Sensor 2 Circuit High Input (Bank 2); DTC P033C: Knock Sensor 4 Circuit Low Input; DTC P033D: Knock Sensor 4 Circuit High Input