Engine Control (diagnostic Codes (p1604-u0101) & Circuit Tests) Lexus IS F I

DESCRIPTION

This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.

Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.

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1. Reference waveforms showing a normal cold engine start
2. Reference waveforms showing a normal warm engine start
3. Reference waveforms showing an engine stop after normal idling
4. Reference values when there is an air leak in the intake system during starting difficulty FREEZE FRAME DATA P1604 STARTABILITY MALFUNCTION Engine Current P1604: Startability Malfunction Time Freeze Frame Data Item Data1 Data2 Data3 Data4 Data5 Unit Engine Speed 1489 769 364 197 114 rpm Calculate Load 25.0 26.6 31.7 28.6 89.0 % Vehicle Load 13.7 12.9 15.2 8.2 12.1 % MAF 10.12 5.04 2.79 0.81 0.68 gm/sec Atmosphere Pressure 101 101 101 101 101 kPa Coolant Temp 93 93 93 93 93 °C Intake Air 37 37 37 37 37 °C Battery Voltage 13.281 13.398 12.792 12.675 12.695 V Throttle Sensor Volt % 17.6 16.0 20.3 17.6 17.6 % Throttle Sensor #2 Volt % 49.8 47.4 52.9 49.4 49.4 % Throttle Sensor Position 0.0 0.0 1.1 0.0 0.0 % Throttle Motor DUTY 17.6 16.0 20.3 17.6 17.6 % Injector (Port) 2604 0 0 0 0 μs Injection Volume (Cylinder 1) 0.155 0.100 0.100 0.100 0.184 ml Fuel Pump/Speed Status ON ON ON ON ON Injection Time (D4) 943 1173 2492 2135 2135 μs EVAP (Purge) VSV 0.0 0.0 0.0 0.0 0.0 % Evap Purge Flow 0.0 0.0 0.0 0.0 0.0 % Purge Density Learn Value 0.000 0.000 0.000 -0.617 0.000 EVAP System Vent Valve OFF OFF OFF OFF OFF EVAP purge VSV OFF OFF ON OFF ON Purge Cut VSV Duty 0.0 0.0 0.0 0.0 0.0 % Target Air-Fuel Ratio 0.940 0.992 0.992 0.992 0.874 AF Lambda B1S1 1.002 0.990 1.232 1.026 1.232 AF Lambda B2S1 0.993 0.993 1.232 1.014 1.232 AFS Voltage B1S1 3.317 3.268 4.996 3.488 4.996 V AFS Voltage B2S1 3.288 3.278 4.996 3.454 4.996 V O2S B1S2 0.055 0.115 0.075 0.115 0.055 V O2S B2S2 0.055 0.115 0.075 0.115 0.055 V Short FT #1 0.000 8.593 19.531 9.375 0.000 % Long FT #1 0.000 0.000 0.000 0.000 -6.250 % Total FT #1 0.117 0.000 0.000 0.000 0.000 Sort FT #2 0.000 7.812 19.531 10.937 0.000 % Long FT #2 0.000 0.000 0.000 0.000 -4.688 % Total FT #2 0.109 0.000 0.000 0.000 0.000 Fuel System Status #1 CL CL CL CL CL Fuel System Status #2 CL CL CL CL CL IGN Advance 16.5 15.0 16.0 18.0 11.5 deg Knock Feedback Value -3.0 -3.0 -3.0 -3.0 -3.0 CA Knock Correct Learn Value 15.6 15.6 15.6 15.6 15.6 CA Starter Signal Close Close Close Close Close Ambient Temp for A/C 26 26 26 26 26 °C

INSPECTION PROCEDURE

HINT

1. In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as starting difficulty. As these DTCs can be stored as a result of certain user actions, even if these DTCs are output, if the customer makes no mention of problems, clear these DTCs without performing any troubleshooting and return the vehicle to the customer.
2. If any other DTCs are output, perform troubleshooting for those DTCs first.
3. When the Data List item "Immobiliser Fuel Cut" is ON, the engine cannot be started.
4. 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. This information can be useful when troubleshooting.
5. When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data. Refer to «FREEZE FRAME DATA»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) .
6. When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
7. Try to start the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and compare it with the freeze frame data.
8. If the malfunction does not reoccur, carefully check the vehicle conditions from when the malfunction occurred using freeze frame data.
9. When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
10. If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is not necessary to repeat the procedure the second time.

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1. Malfunction Recurrence and Inspection Areas Freeze frame data exists, but the malfunction (starting difficulty) has not reoccurred and the malfunction conditions are unknown. The engine speed recorded in the freeze frame data is 0 rpm (the engine does not crank). HINT: One of the following problems may be present: battery depletion, excess engine friction, a starter malfunction or a crankshaft position sensor malfunction. If the battery voltage is less than 6 V during cranking, there is a high probability that engine friction is abnormal. If the battery voltage drops to 5 V or less when starting the engine, the battery may be malfunctioning. If the battery voltage fluctuates while cranking the engine, it can be concluded that cranking is being performed. When the engine speed is 0 rpm, the crankshaft position sensor and/or ECM may be malfunctioning. All engine speeds recorded in the freeze frame data are between 100 and 250 rpm (the engine cranks but there is no combustion). HINT: If the engine speed is between 100 and 250 rpm (no initial combustion), there may be a wiring problem or a complete failure of an ignition or fuel system part. Due to an engine coolant temperature sensor malfunction, the fuel injection volume is extremely high or low and the engine may not be able to be started. The engine speed recorded in the freeze frame data is 250 rpm or higher (the initial combustion and starter turnoff timing is too late). HINT: If the engine speed is 250 rpm or higher (combustion occurs but the initial combustion and starter turnoff timing is too late), the fuel injection volume is often incorrect (too low or too high) and determining the cause of the malfunction is often difficult. Due to an engine coolant temperature sensor malfunction, the fuel injection volume is extremely high or low and engine starting trouble may occur. If Long FT is incorrect, there may be a fuel supply problem due to the injectors or fuel pump being clogged, etc. If the engine cranking speed is too high, compression loss may have occurred due to carbon interfering with the valve operation. When the malfunction (starting difficulty) can be reproduced, or malfunction conditions are known, perform the following inspections ("Problem symptoms" and "Systems to inspect"). Problem symptoms The engine does not crank. HINT: The starter is normal if a noise that indicates the starter pinion gear is extending is heard. The battery may be fully depleted or there may be excess engine friction. The engine cranking speed is abnormal. HINT: If the engine cranking speed is too high (for example, 300 rpm or higher with no combustion), compression loss may have occurred because carbon interfered with valve operation, etc. There is no initial combustion. HINT: If there is no initial combustion, there is probably a wiring problem or an ignition or fuel system part malfunction. The engine stalls after starter turnoff. HINT: If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the VVT may have a problem returning. The initial combustion and starter turnoff occur late. HINT: If the initial combustion and starter turnoff occur late, the fuel injection volume is probably incorrect (too low or too high). HINT: Causes of fuel system malfunctions according to conditions present at the time of the malfunction. When 2 to 3 minutes have elapsed after stopping the engine: Fuel pressure loss due to the pressure regulator failing to maintain the fuel pressure. When 15 to 120 minutes have elapsed after stopping the engine: Problem with injector fuel seal. When a long time has elapsed after stopping the engine: Pressure regulator is stuck open. Systems to inspect Intake system Ignition system Fuel system
2. INSPECTION FLOW Freeze frame data exists, but the malfunction (starting difficulty) has not reoccurred and the malfunction conditions are unknown. Freeze Frame Data Item Result Suspected Area Procedure Engine Speed 0 rpm (no engine cranking at all) Battery fully depleted Engine assembly (excess friction) Starter assembly Immobiliser system Crankshaft position sensor ECM 4 to 9 100 to 250 rpm (engine cranks but no initial combustion*1) Fuel pump (for low pressure) control system Ignition system Engine coolant temperature sensor Fuel injection system 10 to 14 250 rpm or higher (combustion occurs but initial combustion and starter turnoff*2 occur late) Engine assembly (compression loss) Fuel injection system Fuel pump (for low pressure) control system 15 to 23 HINT: *1: First combustion after cranking begins. *2: Condition when engine speed increases and the starter can be turned off. When the malfunction (starting difficulty) can be reproduced, or when malfunction conditions are known. Problem symptoms Problem Symptom Suspected Area Suspected Component Procedure The engine does not crank Battery malfunction Battery fully depleted 26 to 31 Starting system Starter (includes pinion gear wear or tooth damage) Starting system Immobiliser system Immobiliser system Engine assembly Engine assembly (excess friction) Drive plate wear or tooth damage Cranking speed too low Battery malfunction Battery fully depleted 32 to 34 Starting system Starter assembly Engine assembly Engine assembly (excess friction) Cranking speed too high Engine assembly Engine assembly (compression loss) There is no initial combustion Fuel supply problem Maintenance of fuel pressure by pressure regulator Fuel injector leak Fuel leak from fuel line Fuel pump (for low pressure) control system Fuel pump (for low pressure) 35 to 50 Ignition system malfunction Spark plug Crankshaft position sensor Ignition coil Engine stalls after starter turnoff Air suction Intake system connections 51 to 57 Deposits in throttle body assembly Throttle body assembly VVT valve does not return properly Camshaft timing oil control valve assembly VVT-iE system Mass air flow meter malfunction Mass air flow meter The initial combustion and starter turnoff occur late Engine coolant temperature sensor malfunction Engine coolant temperature sensor 58 to 71 Mass air flow meter malfunction Mass air flow meter Abnormal air fuel ratio learning value Air fuel ratio sensor Deviation from fuel injection characteristics Fuel injector for port injection Wet-fouled or dry-fouled spark plug Spark plug Lack of fuel pressure Pressure regulator Fuel pump (for low pressure) Fuel pump (for low pressure) control system Systems to inspect Troubleshooting by System Suspected Area Suspected Component Procedure Fuel system troubleshooting A Abnormal air fuel ratio learning value Fuel injector for port injection 92 to 99 100 to 107 Rough idling Crankshaft position sensor Abnormal fuel pressure Fuel Fuel leak from fuel line Fuel pump (for low pressure) Pressure regulator Fuel system troubleshooting B Abnormal concentration of HC in surge tank Purge VSV system Fuel injector for port injection 108 to 110 Fuel system troubleshooting C Injection signal system malfunction Fuel injector for port injection Crankshaft position sensor Camshaft position sensor VVT sensor ECM 73 to 78 Intake system troubleshooting Difference between ISC target value and opening angle when idling Engine assembly (compression loss) Valve timing Engine coolant temperature sensor ECM 89 to 91 111 to 113 Ignition system troubleshooting Camshaft and/or crankshaft position sensor signal malfunction Crankshaft position sensor system (including sensor installation) Camshaft position sensor system (including sensor installation) VVT sensor system (including sensor installation) ECM 79 to 88 114 to 123 NOTE: Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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1. CHECK ANY OTHER DTCS OUTPUT AND RECORD FREEZE FRAME DATA (IN ADDITION TO DTC P1604) 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 and record the freeze frame data. HINT: This freeze frame data shows the actual engine conditions when engine starting trouble occurred. When confirming the freeze frame data, be sure to check all 5 data sets of freeze frame data. The fourth set of freeze frame data is the data recorded when the DTC is stored. RESULT Result Proceed to Only DTC P1604 is output A DTCs other than P1604 are output B B --> See step 124 A: Go to next step
2. CHECK ENGINE IMMOBILISER SYSTEM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / All Data / Immobiliser Fuel Cut. Read the value displayed on the Techstream. OK Immobiliser Fuel Cut is OFF. HINT: If the engine is cranked immediately after reconnecting the battery cable (key verification for immobiliser system not completed), the engine cannot be started. Key verification needs to wait for several seconds after turning the engine switch on (IG). NG --> See step 125 OK: Go to next step
3. CHECK MALFUNCTION CONDITION Confirm the problem symptoms. RESULT Result Proceed to Freeze frame data exists, but the problem symptoms cannot be reproduced and the malfunction conditions are unknown A The problem symptoms can be reproduced, or the malfunction conditions are known B B --> See step 25 A: Go to next step
4. READ FREEZE FRAME DATA Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored. Refer to «FREEZE FRAME DATA»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Result Freeze Frame Data Item for DTC P1604 Suspected Area Proceed to Engine Speed Battery Voltage All 0 rpm (no engine cranking at all) Minimum voltage is less than 5 V Battery fully depleted A Minimum voltage is 5 V or higher Starter malfunction Crankshaft position sensor system Excess engine friction Immobiliser system ECM B 100 to 250 rpm (engine cranks but no initial combustion) - Fuel pump (for low pressure) control system Ignition system Engine coolant temperature sensor Immobiliser system Fuel injection system C 250 rpm or higher (combustion occurs but initial combustion and starter turnoff occur late) - Engine assembly Fuel injection system Fuel pump (for low pressure) control system D HINT: When DTC P1604 is stored, either "Engine Start Hesitation"*1 or "Low Rev for Eng Start"*2 in the Freeze Frame Data will be ON. If "Low Rev for Eng Start" is ON, proceed to E. *1: "Engine Start Hesitation" turns ON when the engine speed does not reach a certain value for a certain period of time when starting the engine. *2: "Low Rev for Eng Start" turns ON when the engine stalls immediately after starting the engine. If "Low Rev for Eng Start" is ON, as there is a possibility that the low engine speed or engine stall was caused by the user, confirm the following freeze frame data items. Immobiliser Fuel Cut Engine Speed (Starter OFF) Shift SW Status (R, D Range) E --> See step 51 D --> See step 15 C --> See step 10 B --> See step 5 A --> CHARGE OR REPLACE BATTERY
5. READ FREEZE FRAME DATA Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored. Refer to «FREEZE FRAME DATA»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Result Freeze Frame Data Item for DTC P1604 Result Suspected Area Proceed to Battery Voltage Minimum voltage is 6 V or higher and voltage does not fluctuate*1 Starter system A Minimum voltage is 6 V or higher and voltage fluctuates*2, *3 Crankshaft position sensor system ECM B Minimum voltage is 5 to 6 V*4 Excess engine friction Battery fully depleted C HINT: *1: The 5 sets of freeze frame data show approximately the same battery voltage. *2: The 5 sets of freeze frame data show different battery voltages. *3: If the voltage fluctuates, it can be determined that cranking is being performed normally. When the engine speed is 0 rpm, the crankshaft position sensor system and/or the ECM may be malfunctioning. *4: There may be excess engine friction. Make sure that the crankshaft rotates smoothly when turning it by hand. Excess engine friction may have occurred temporarily. Remove the cylinder head covers and oil pan, and check for foreign matter such as metal fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts. C --> CHECK AND REPAIR ENGINE OR BATTERY B --> See step 6 A --> See step 126
6. CHECK CRANKSHAFT POSITION SENSOR INSTALLATION Check the tightening and installation condition of the crankshaft position sensor bolt. Check the connection of the crankshaft position sensor connector. NG --> See step 127 OK: Go to next step
7. CHECK CRANKSHAFT POSITION SENSOR Disconnect the crankshaft position sensor connector. Check for oil on the connector terminals. OK No oil on the terminals. Reconnect the crankshaft position sensor connector. NG --> See step 128 OK: Go to next step
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 z4-1 (NE) - E3-27 (NE+) Always Below 1 ohms z4-2 (NE-) - E3-34 (NE-) Always Below 1 ohms z4-3 (VC) - E3-18 (VC) 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 z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the crankshaft position sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
9. CHECK CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 129 OK --> END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)
10. READ FREEZE FRAME DATA Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored. Refer to «FREEZE FRAME DATA»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Result Freeze Frame Data Item for DTC P1604 Suspected Area Proceed to Coolant Temp, Ambient Temp for A/C, Intake Air Coolant Temp, Ambient Temp for A/C Fuel Pump/Speed Status Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is 10°C (18°F) or more*1 Coolant Temp is 125°C (257°F) or more, or lower than Ambient Temp for A/C by 15°C (27°F) or more - Engine coolant temperature sensor A Other than above All 5 sets of freeze frame data are ON - B At least 1 of the 5 sets of freeze frame data is OFF Fuel pump (for low pressure) control system C Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is less than 10°C (18°F)*2 - At least 1 of the 5 sets of freeze frame data is OFF Fuel pump (for low pressure) control system C All 5 sets of freeze frame data are ON - B HINT: *1: A long time had not elapsed after stopping the engine. *2: A long time had elapsed after stopping the engine. C --> See step 131 B --> See step 11 A --> See step 130
11. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED) Connect the Techstream to the DLC3. Disconnect the fuel pump (for low pressure) connector. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition Q14-4 - Body ground Active Test is being performed 11 to 14 V HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the fuel pump (for low pressure) connector. NG --> See step 131 OK: Go to next step
12. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE) Disconnect the fuel injector for port injection connectors. 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 I9-2 - Ground Engine switch on (IG) 11 to 14 V I10-2 - Ground Engine switch on (IG) 11 to 14 V I11-2 - Ground Engine switch on (IG) 11 to 14 V I12-2 - Ground Engine switch on (IG) 11 to 14 V H9-2 - Ground Engine switch on (IG) 11 to 14 V H10-2 - Ground Engine switch on (IG) 11 to 14 V H11-2 - Ground Engine switch on (IG) 11 to 14 V H12-2 - Ground Engine switch on (IG) 11 to 14 V HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the fuel injector for port injection connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - IG2 RELAY) OK: Go to next step
13. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. When performing the Active Test, check for fuel leakage from the fuel pipes. RESULT Result Proceed to Fuel leakage or signs of fuel leakage are present A No fuel leakage or signs of fuel leakage B HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. When performing the Active Test, if there is no operating noise from the fuel pump (for low pressure), the fuel pump (for low pressure) system may be malfunctioning. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected. B --> See step 14 A --> REPAIR OR REPLACE FUEL LINE
14. CHECK FUEL SYSTEM Check for foreign matter such as iron particles around the fuel pump (for low pressure) (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump (for low pressure) was stuck. RESULT Result Proceed to There is foreign matter or signs that fuel pump (for low pressure) was stuck A There is no foreign matter and no signs that fuel pump (for low pressure) was stuck B B --> See step 24 A --> REPAIR OR REPLACE FUEL SYSTEM
15. READ FREEZE FRAME DATA Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored. Refer to «FREEZE FRAME DATA»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Result Freeze Frame Data Item for DTC P1604 Suspected Area Proceed to Coolant Temp, Ambient Temp for A/C, Intake Air Coolant Temp, Ambient Temp for A/C Long FT Engine Speed Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is 10°C (18°F) or more Coolant Temp is 125°C (257°F) or more, or lower than Ambient Temperature by 15°C (27°F) or more - - Engine coolant temperature sensor A Other than above -15% or less, or +15% or more - Fuel pump (for low pressure) control system Fuel injector for port injection B -15 to +15% Minimum speed is 300 rpm or more* Engine assembly C Minimum speed is below 300 rpm Fuel system Intake air system D Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is less than 10°C (18°F) - -15% or less, or +15% or more - Fuel pump (for low pressure) control system Fuel injector for port injection B -15 to +15% Minimum speed is 300 rpm or more* Engine assembly C Minimum speed is below 300 rpm Fuel system Intake air system D HINT: *: Compression loss may have occurred in the engine assembly. D --> See step 18 C --> CHECK AND REPAIR ENGINE ASSEMBLY B --> See step 16 A --> See step 130
16. INSPECT FUEL INJECTOR FOR PORT INJECTION Check that no carbon is stuck to the fuel injector for port injection. OK No carbon present. NG --> See step 132 OK: Go to next step
17. CHECK FUEL SYSTEM Check for foreign matter such as iron particles around the fuel pump (for low pressure) (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump (for low pressure) was stuck. RESULT Result Proceed to There is foreign matter or signs that fuel pump (for low pressure) was stuck A There is no foreign matter and no signs that fuel pump (for low pressure) was stuck B B --> See step 24 A --> REPAIR OR REPLACE FUEL SYSTEM
18. READ FREEZE FRAME DATA Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored. Refer to «FREEZE FRAME DATA»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Result Freeze Frame Data Item for DTC P1604 Result Suspected Area Proceed to Coolant Temp Engine coolant temperature is 40°C (104°F) or less*1 Pressure regulator A Engine coolant temperature is 40 to 90°C (104 to 194°F)*2 Fuel injector for port injection B Engine coolant temperature is 90°C (194°F) or more*3 Pressure regulator A HINT: *1: If the engine coolant temperature is 40°C (104°F) or less (after stopping the engine and the vehicle is not driven for a long period of time), the pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine. *2: If the engine coolant temperature is 40 to 90°C (104 to 194°F) (15 to 120 minutes have passed after stopping the engine), there may be fuel leaking from a fuel injector. *3: If the engine coolant temperature is 90°C (194°F) or more (2 to 5 minutes have passed after stopping the engine), there may be a problem with the pressure regulator failing to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine. B --> See step 20 A: Go to next step
19. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) HINT: For the fuel pressure inspection, refer to the following procedures. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . Attach a fuel pressure gauge and check the fuel pressure after stopping the engine. Standard 147 kPa (1.5 kgf/cm 2 , 21 psi) or higher (5 minutes after stopping the engine) HINT: If the engine cannot be started, read the values after cranking the engine. RESULT Result Proceed to NG A OK B B --> See step 24 A --> See step 133
20. CHECK FUEL INJECTOR FOR PORT INJECTION Clean the inside of the surge tank with compressed air. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes. Result Result Proceed to 400 ppm or higher A Less than 400 ppm B HINT: If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem. B --> See step 22 A: Go to next step
21. CHECK FUEL INJECTOR FOR PORT INJECTION Inspect the fuel injectors. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information) . Result Result Proceed to NG A OK B B --> See step 22 A --> See step 132
22. CHECK THROTTLE BODY ASSEMBLY Check if carbon is in the air flow passage. Result Result Proceed to Carbon in passage A No carbon present B B --> See step 23 A --> See step 134
23. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION - Step 1»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
24. PERFORM SIMULATION TEST Check if the engine can be started. Result Result Proceed to Engine can be started A Engine cannot be started B B --> See step 25 A --> END
25. CHECK MALFUNCTION CONDITION Confirm the problem symptoms. HINT: The problem symptoms below can be determined by reading the freeze frame data. Result Problem Symptom Suspected Area Proceed to The engine does not crank Battery fully depleted Starter (includes pinion gear wear or teeth damage) Starter system Engine assembly (excess friction) Drive plate wear or teeth damage A Abnormal cranking speed Battery fully depleted Starter Engine assembly (excess friction, compression loss) B There is no initial combustion (combustion does not occur even once)*1 Fuel pressure of pressure regulator maintained Fuel injector leak Fuel leak from fuel line Fuel pump (for low pressure) control system Fuel pump (for low pressure) Spark plug Crankshaft position sensor system Ignition coil system C The engine stalls after starter turnoff (engine stalls immediately after the first time the engine speed increases)*2 Intake system connections Throttle body assembly Camshaft timing oil control valve Mass air flow meter system D The initial combustion and starter turnoff occur late*3 Engine coolant temperature sensor Mass air flow meter Air fuel ratio sensor Heated oxygen sensor Fuel injector for port injection Spark plug Pressure regulator Fuel pump (for low pressure) Fuel pump (for low pressure) control system E HINT: If there is hesitation (cranking speed is slow and combustion occurs before passing TDC) during the initial cranking period, the battery charge may be insufficient or the starter may be malfunctioning. *1: If there is no initial combustion, a wire harness , or the ignition or fuel system may be malfunctioning. *2: If the engine stalls after starter turn off, the air-fuel ratio may be incorrect or the camshaft timing oil control valve may have a problem returning. *3: If the initial combustion and starter turnoff occur late, the fuel injection volume may be incorrect (too low or too high). E --> See step 58 D --> See step 51 C --> See step 35 B --> See step 32 A: Go to next step
26. PERFORM SIMULATION TEST When cranking the engine, check for a noise indicating that the starter pinion gear is extending, and check whether the starter pinion gear is spinning freely. Result Problem Symptom Suspected Area Proceed to A noise indicating that the starter pinion gear is extending is heard and the starter pinion gear is not spinning freely* Battery Excess engine friction Starter A A noise indicating that the starter pinion gear is extending is heard but the starter pinion gear is spinning freely Drive plate Starter B A noise indicating that the starter pinion gear is extending is not heard Battery Starter Starter system C HINT: *: The battery may be fully depleted or there may be excess engine friction. C --> See step 30 B --> See step 29 A: Go to next step
27. INSPECT BATTERY Check the electrolyte quantity. Standard Electrolyte quantity is within the specified range. Inspect the specific gravity. Inspect the specific gravity of each cell. Standard specific gravity 1.25 to 1.29 (electrolyte is at 20°C (68°F)) HINT: If the result is not as specified, recharge or replace the battery. It is not necessary to inspect a maintenance-free battery. Inspect the battery voltage. Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery. Measure the battery voltage. Standard voltage 12.5 to 12.9 V (electrolyte is at 20°C (68°F)) HINT: If the result is not as specified, recharge or replace the battery. When the battery is depleted, the horn becomes quieter. Measure the battery voltage when cranking the engine. Standard Approximately 6 V or higher (0°C (32°F) or higher) NG --> CHARGE OR REPLACE BATTERY OK: Go to next step
28. CHECK ENGINE ASSEMBLY Check that the crankshaft rotates smoothly when rotating it by hand. OK Crankshaft rotates smoothly. HINT: Excess engine friction may have occurred temporarily. Remove the cylinder head covers and oil pan, and check for foreign matter such as metal fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts. NG --> REPAIR OR REPLACE ENGINE ASSEMBLY OK --> See step 136
29. CHECK STARTER ASSEMBLY Remove the starter assembly. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/starter/#starting-service-information) . Check for starter pinion gear wear and damage. Standard There is no wear or damage. Install the starter assembly. Refer to «INSTALLATION»(/lexus/is-f/i-2007-2014/remont/starter/#starting-service-information) . NG --> See step 137 OK --> See step 135
30. INSPECT BATTERY Check the electrolyte quantity. Standard Electrolyte quantity is within the specified range. Inspect the specific gravity. Inspect the specific gravity of each cell. Standard specific gravity 1.25 to 1.29 (electrolyte is at 20°C (68°F)) HINT: If the result is not as specified, recharge or replace the battery. It is not necessary to inspect a maintenance-free battery. Inspect the battery voltage. Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery. Measure the battery voltage. Standard voltage 12.5 to 12.9 V (electrolyte is at 20°C (68°F)) HINT: If the result is not as specified, recharge or replace the battery. When the battery is depleted, the horn becomes quieter. Measure the battery voltage when cranking the engine. Standard Approximately 6 V or higher (0°C (32°F) or higher) NG --> CHARGE OR REPLACE BATTERY OK: Go to next step
31. INSPECT STARTER ASSEMBLY Inspect the starter assembly. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/starter/#starting-service-information) . NG --> See step 137 OK --> See step 126
32. PERFORM SIMULATION TEST Check the cranking speed. Result Problem Symptom Suspected Area Proceed to Cranking speed is slow (100 rpm or less) Battery Starter assembly Excess engine friction A Cranking speed is fast (300 rpm or more)* Engine compression loss B HINT: *: If the cranking speed is fast, there may be compression loss. B --> CHECK AND REPAIR ENGINE ASSEMBLY A: Go to next step
33. INSPECT BATTERY Check the electrolyte quantity. Standard Electrolyte quantity is within the specified range. Inspect the specific gravity. Inspect the specific gravity of each cell. Standard specific gravity 1.25 to 1.29 (electrolyte is at 20°C (68°F)) HINT: If the result is not as specified, recharge or replace the battery. It is not necessary to inspect a maintenance-free battery. Inspect the battery voltage. Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery. Measure the battery voltage. Standard voltage 12.5 to 12.9 V (electrolyte is at 20°C (68°F)) HINT: If the result is not as specified, recharge or replace the battery. When the battery is depleted, the horn becomes quieter. Measure the battery voltage when cranking the engine. Standard Approximately 6 V or higher (0°C (32°F) or higher) NG --> CHARGE OR REPLACE BATTERY OK: Go to next step
34. CHECK ENGINE ASSEMBLY Check that the crankshaft rotates smoothly when rotating it by hand. OK Crankshaft rotates smoothly. HINT: Excess engine friction may have occurred temporarily. Remove the cylinder head covers and oil pan, and check for foreign matter such as metal fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts. NG --> REPAIR OR REPLACE ENGINE ASSEMBLY OK --> See step 136
35. CHECK FUEL INJECTOR FOR PORT INJECTION Using a sound scope or screwdriver, check for a fuel injector for port injection operating noise while cranking the engine. OK Fuel injector for port injection operating noise is heard. NG --> See step 48 OK: Go to next step
36. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Inspect 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 46 OK: Go to next step
37. CHECK SPARK PLUG AND SPARK Check for sparks. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/ignition-system/#ignition-inspection) . NG --> See step 41 OK: Go to next step
38. CONFIRM VEHICLE CONDITION Confirm the conditions present when the malfunction occurred based on the customer problem analysis. Result Problem Symptom Suspected Area Proceed to When the engine is stopped and a long time has passed, engine starting trouble occurs*1 Pressure regulator is stuck open A When the engine is stopped and approximately 15 to 120 minutes have passed, engine starting trouble occurs*2 Fuel injector leak B When the engine is stopped and approximately 2 to 3 minutes have passed, engine starting trouble occurs*3 Failure to maintain fuel pressure by pressure regulator A Condition other than above, or there is an inconsistency in the conditions present when engine starting trouble occurs - C*4 HINT: *1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine. *2: Fuel may be leaking from a fuel injector for port injection. *3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine. *4: From step 72, perform fuel system troubleshooting C (steps 73 to 78). C --> See step 72 B --> See step 40 A: Go to next step
39. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) HINT: For the fuel pressure inspection, refer to the following procedures. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . Attach a fuel pressure gauge and check the fuel pressure after stopping the engine. Result Result Proceed to Less than 147 kPa (1.5 kgf/cm 2 ) (5 minutes after stopping the engine) A 147 kPa (1.5 kgf/cm 2 ) or higher (5 minutes after stopping the engine) B* HINT: If the engine cannot be started, check the fuel pressure after cranking the engine. *: From step 72, perform fuel system troubleshooting C (steps 73 to 78). B --> See step 72 A --> See step 133
40. CHECK FUEL INJECTOR FOR PORT INJECTION After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes. Result Result Proceed to 400 ppm or higher A Less than 400 ppm B* HINT: If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem. *: From step 72, perform fuel system troubleshooting C (steps 73 to 78). B --> See step 72 A --> See step 132
41. CHECK SPARK PLUG Inspect the spark plugs. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/ignition-system/#ignition-inspection) . HINT: Even if the spark plug of only one cylinder is malfunctioning, replace the spark plugs of all cylinders. NG --> See step 138 OK: Go to next step
42. READ VALUE USING TECHSTREAM (ENGINE SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Engine Speed. Start the engine. While running the engine, read the Engine Speed value. Standard A value that matches the actual engine speed is constantly output. HINT: Check the engine speed using a line graph. If the engine cannot be started, check the engine speed while cranking the engine. If the engine speed is 0 rpm, the crankshaft position sensor may have an open or short circuit. NG --> See step 139 OK: Go to next step
43. CHECK HARNESS AND CONNECTOR (IGNITION COIL 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 HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ignition coil connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL - IG2 RELAY) OK: Go to next step
44. CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM) Disconnect the ignition coil 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 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 HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the ignition coil connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
45. CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM) Disconnect the ignition coil 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 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 HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. If the wire harness is normal, after replacing the ignition coil, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 72 and perform troubleshooting for the ignition system (steps 79 to 88 ). Reconnect the ECM connector. Reconnect the ignition coil connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 153
46. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. When performing the Active Test, check for an operating sound from the fuel pump (for low pressure). Standard Techstream Operation Specified Condition ON Operating sound heard OFF Operating sound not heard HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. NG --> See step 131 OK: Go to next step
47. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. When performing the Active Test, check for fuel leakage from the fuel pipes. RESULT Result Proceed to Fuel leakage or signs of fuel leakage are present A No fuel leakage or signs of fuel leakage B HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected. If there are no fuel leaks, after inspecting the fuel pump (for low pressure) control system, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 72 and perform fuel system troubleshooting (steps 73 to 78). B --> See step 131 A --> REPAIR OR REPLACE FUEL LINE
48. READ VALUE USING TECHSTREAM (ENGINE SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Engine Speed. Start the engine. While running the engine, read the Engine Speed value. Standard A value that matches the actual engine speed is constantly output. HINT: Check the engine speed using a line graph. If the engine cannot be started, check the engine speed while cranking the engine. If the engine speed is 0 rpm, the crankshaft position sensor may have an open or short circuit. NG --> See step 128 OK: Go to next step
49. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE) Disconnect the fuel injector for port injection 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 I9-2 - Ground Engine switch on (IG) 11 to 14 V I10-2 - Ground Engine switch on (IG) 11 to 14 V I11-2 - Ground Engine switch on (IG) 11 to 14 V I12-2 - Ground Engine switch on (IG) 11 to 14 V H9-2 - Ground Engine switch on (IG) 11 to 14 V H10-2 - Ground Engine switch on (IG) 11 to 14 V H11-2 - Ground Engine switch on (IG) 11 to 14 V H12-2 - Ground Engine switch on (IG) 11 to 14 V HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the fuel injector for port injection connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - IG2 RELAY) OK: Go to next step
50. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - ECM) Disconnect the fuel injector for port injection 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 I9-1 - E5-17 (#10) Always Below 1 ohms H9-1 - E4-11 (#20) Always Below 1 ohms I10-1 - E5-16 (#30) Always Below 1 ohms H10-1 - E4-10 (#40) Always Below 1 ohms I11-1 - E5-15 (#50) Always Below 1 ohms H11-1 - E4-9 (#60) Always Below 1 ohms I12-1 - E5-14 (#70) Always Below 1 ohms H12-1 - E4-8 (#80) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition I9-1 or E5-17 (#10) - Body ground Always 10 kohms or higher H9-1 or E4-11 (#20) - Body ground Always 10 kohms or higher I10-1 or E5-16 (#30) - Body ground Always 10 kohms or higher H10-1 or E4-10 (#40) - Body ground Always 10 kohms or higher I11-1 or E5-15 (#50) - Body ground Always 10 kohms or higher H11-1 or E4-9 (#60) - Body ground Always 10 kohms or higher I12-1 or E5-14 (#70) - Body ground Always 10 kohms or higher H12-1 or E4-8 (#80) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the fuel injector for port injection connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 129
51. INSPECT MASS AIR FLOW METER Inspect the mass air flow meter. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NG --> See step 57 OK: Go to next step
52. CHECK INTAKE SYSTEM Check for air suction in the intake system [vacuum hose disconnection, cracks, damaged gaskets, etc.]. Refer to «ON-VEHICLE INSPECTION - Step 1»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . HINT: If the accelerator pedal is released after racing the engine, the inspection is easier to perform because the vacuum inside the intake manifold increases and the air suction noise becomes louder. If Short FT and Long FT are largely different from the normal values when idling (intake air volume is small) and almost the same as the normal values when racing the engine (intake air volume is high), air leakage may be present. Standard There is no air suction. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
53. CHECK THROTTLE BODY ASSEMBLY Disconnect the throttle body assembly connector. HINT: When the connector is disconnected, the vehicle enters fail-safe mode and the throttle valve opening angle is 4 to 7°. Crank the engine and check that it starts. Result Result Proceed to Engine starts A Engine does not start B Connect the throttle body assembly connector. HINT: When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . B --> See step 55 A: Go to next step
54. CHECK THROTTLE BODY ASSEMBLY Check if carbon is in the air flow passage. Standard No carbon present. NG --> REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY ASSEMBLY OK: Go to next step
55. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT-IE LINEAR) Connect the Techstream to the DLC3. Turn the engine switch on (IG). 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). Monitor 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 --> 40 deg --> 10 deg --> 0 deg --> 10 deg --> END Within 5 DegFR HINT: When viewed from the rear of the engine assembly, bank 1 is on the left side and bank 2 is on the right side. Juggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. NG --> See step 140 OK: Go to next step
56. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT EXHAUST LINEAR) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Start the engine and warm it up. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT Exhaust Linear (Bank 1) or Control the VVT Exhaust Linear (Bank 2). Check the engine speed while operating the oil control valve using the Techstream. OK* Techstream Operation Specified Condition 0% Normal engine speed 100% Engine idles roughly or stalls Result Result Proceed to NG A OK B HINT: *: From step 72, perform intake system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99). Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. When the results of the inspection using the Active Test are normal but the camshaft timing oil control valve operating noise is abnormal, check the camshaft timing oil control valve for any signs of problems. If the camshaft timing oil control valve assembly is stuck on, the valve overlap increases and combustion worsens due to the internal EGR which may cause the engine to stall. B --> See step 72 A --> See step 141
57. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) Disconnect the mass air flow 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 E29-5 (VG) - E3-25 (VG) Always Below 1 ohms E29-4 (E2G) - E3-24 (E2G) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E29-5 (VG) or E3-25 (VG) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. If the wire harness is normal, after replacing the mass air flow meter, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 72 and perform intake system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99). Reconnect the ECM connector. Reconnect the mass air flow meter connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 142
58. INSPECT ENGINE COOLANT TEMPERATURE SENSOR Inspect the engine coolant temperature sensor. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . HINT: If the engine coolant temperature sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. NG --> See step 130 OK: Go to next step
59. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Disconnect the engine coolant temperature 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 E40-2 - E3-19 (THW) Always Below 1 ohms E40-1 - E3-28 (E2) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E40-2 or E3-19 (THW) - Body ground Always 10 kohms or higher E40-1 or E3-28 (E2) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. If the wire harness or connector is malfunctioning, after replacing or repairing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. Reconnect the ECM connector. Reconnect the engine coolant temperature sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
60. INSPECT MASS AIR FLOW METER Inspect the mass air flow meter. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . HINT: If the mass air flow meter is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. NG --> See step 142 OK: Go to next step
61. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) Disconnect the mass air flow 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 E29-5 (VG) - E3-25 (VG) Always Below 1 ohms E29-4 (E2G) - E3-24 (E2G) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E29-5 (VG) or E3-25 (VG) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. If the wire harness or connector is malfunctioning, after replacing or repairing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. Reconnect the ECM connector. Reconnect the mass air flow meter connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
62. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Atmosphere Pressure and Long FT #1, #2. Read the value. Result Data List Item Result Suspected Area Proceed to Long FT #1, #2 +25% or more or less than -25% Air fuel ratio sensor Heated oxygen sensor Mass air flow meter Fuel injector for port injection ECM A Atmosphere Pressure 80 kPa (600 mmHg) or less (when altitude is 0 m) Both Data List items listed above Values are other than above - B B --> See step 66 A: Go to next step
63. PERFORM SIMULATION TEST Remove the EFI and ETCS fuses from the engine room relay block. After 60 seconds or more have elapsed, install the EFI and ETCS fuses. Check if the engine can be started. RESULT Result Proceed to Engine can be started A Engine cannot be started B B --> See step 66 A: Go to next step
64. INSPECT AIR FUEL RATIO SENSOR Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Fuel System Status #1 and Fuel System Status #2. Confirm that Fuel System Status #1 and Fuel System Status #2 are both CL. Enter the following menus: Powertrain / Engine / Data List / AF Lambda B1S1 and AF Lambda B2S1. Confirm that AF Lambda B1S1 and AF Lambda B2S1 are both within the range of 0.95 to 1.05 when idling. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor. Read the output voltage from the air fuel ratio sensor when increasing and decreasing the fuel injection volume. Standard Techstream Display Injection Volume Specified Condition AFS Voltage B1S1 AFS Voltage B2S1 +25% Air fuel ratio sensor output voltage is below 3.1 V -12.5% Air fuel ratio sensor output voltage is higher than 3.4 V HINT: 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. If the air fuel ratio sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. NG --> See step 143 OK: Go to next step
65. PERFORM SIMULATION TEST Check if the idle speed is stable after starting the engine. OK Idle speed is stable. HINT: After replacing the fuel injector for port injection or mass air flow meter, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. NG --> See step 132 OK --> See step 142
66. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Inspect 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 71 OK: Go to next step
67. CHECK SPARK PLUG Inspect the spark plugs. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/ignition-system/#ignition-inspection) . RESULT Result Proceed to All cylinders are normal A One cylinder is abnormal*1 B All cylinders are abnormal*2, *3 C HINT: *1: If one cylinder is abnormal, replace the spark plug of that cylinder and inspect the ignition and fuel system for that cylinder. After performing repairs, check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. *2: If all cylinders are abnormal, replace the spark plugs of all cylinders and check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. *3: Engine starting trouble may occur if the vehicle is driven extremely short distances repeatedly. C --> See step 145 B --> See step 144 A: Go to next step
68. CONFIRM VEHICLE CONDITION Confirm the conditions present when the malfunction occurred based on the customer problem analysis. Result Problem Symptom Suspected Area Proceed to When the engine is stopped and a long time has passed, engine starting trouble occurs*1 Pressure regulator is stuck open A When the engine is stopped and approximately 15 to 120 minutes have passed, engine starting trouble occurs*2 Fuel injector leak B When the engine is stopped and approximately 2 to 3 minutes have passed, engine starting trouble occurs*3 Failure to maintain fuel pressure by pressure regulator A Condition other than above, or there is an inconsistency in the conditions present when engine starting trouble occurs - C*4 HINT: *1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine. *2: Fuel may be leaking from a fuel injector for port injection. *3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine. *4: From step 72, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. C --> See step 72 B --> See step 70 A: Go to next step
69. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) HINT: For the fuel pressure inspection, refer to the following procedures. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . Attach a fuel pressure gauge and check the fuel pressure after stopping the engine. Result Result Proceed to Less than 147 kPa (1.5 kgf/cm 2 ) (5 minutes after stopping the engine) A 147 kPa (1.5 kgf/cm 2 ) or higher (5 minutes after stopping the engine) B* HINT: If the engine cannot be started, check the fuel pressure after cranking the engine. *: From step 72, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. B --> See step 72 A --> See step 133
70. CHECK FUEL INJECTOR FOR PORT INJECTION Clean the inside of the surge tank with compressed air. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes. Result Result Proceed to 400 ppm or higher A Less than 400 ppm B* HINT: If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem. *: From step 72, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. B --> See step 72 A --> See step 132
71. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. When performing the Active Test, check for fuel leakage from the fuel pipes. RESULT Result Proceed to Fuel leakage or signs of fuel leakage are present A No fuel leakage or signs of fuel leakage B HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected. If there are no fuel leaks, after inspecting the fuel pump control system, check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. B --> See step 131 A --> REPAIR OR REPLACE FUEL LINE
72. CHECK MALFUNCTION CONDITION If the malfunction could not be identified during the inspection in steps 38, 39, 40 and 47, perform fuel system troubleshooting C (steps 73 to 78). Result Performed Step Troubleshooting by System Procedure (Step) Proceed to Steps 38, 39, 40 and 47 Fuel system troubleshooting C 73 to 78 A If the malfunction could not be identified during the inspection in step 45, perform ignition system troubleshooting (steps 79 to 88). Result Performed Step Troubleshooting by System Procedure (Step) Proceed to Step 45 Ignition system troubleshooting 79 to 88 B If the malfunction could not be identified during the inspection in steps 55, 56 and 57, perform intake air system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99). Result Performed Step Troubleshooting by System Procedure (Step) Proceed to Step 55, 56 and 57 Intake air system troubleshooting 89 to 91 C Fuel system troubleshooting A 92 to 99 If the malfunction could not be identified during the inspection in steps 58, 59, 60, 61, 64, 65, 67, 68, 69, 70 and 71, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake air system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order. Result Performed Step Troubleshooting by System Procedure (Step) Proceed to Steps 58, 59, 60, 61, 64, 65, 67, 68, 69, 70 and 71 Fuel system troubleshooting A 100 to 107 D Fuel system troubleshooting B 108 to 110 Intake air system troubleshooting 111 to 113 Ignition system troubleshooting 114 to 123 D --> See step 100 C --> See step 89 B --> See step 79 A: Go to next step
73. INSPECT FUEL INJECTOR FOR PORT INJECTION Inspect the fuel injectors for port injection. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information) . NG --> See step 132 OK: Go to next step
74. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE) Disconnect the fuel injector for port injection 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 I9-2 - Ground Engine switch on (IG) 11 to 14 V H9-2 - Ground Engine switch on (IG) 11 to 14 V I10-2 - Ground Engine switch on (IG) 11 to 14 V H10-2 - Ground Engine switch on (IG) 11 to 14 V I11-2 - Ground Engine switch on (IG) 11 to 14 V H11-2 - Ground Engine switch on (IG) 11 to 14 V I12-2 - Ground Engine switch on (IG) 11 to 14 V H12-2 - Ground Engine switch on (IG) 11 to 14 V HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the fuel injector for port injection connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - IG2 RELAY) OK: Go to next step
75. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - ECM) Disconnect the fuel injector for port injection 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 I9-1 - E5-17 (#10) Always Below 1 ohms H9-1 - E4-11 (#20) Always Below 1 ohms I10-1 - E5-16 (#30) Always Below 1 ohms H10-1 - E4-10 (#40) Always Below 1 ohms I11-1 - E5-15 (#50) Always Below 1 ohms H11-1 - E4-9 (#60) Always Below 1 ohms I12-1 - E5-14 (#70) Always Below 1 ohms H12-1 - E4-8 (#80) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition I9-1 or E5-17 (#10) - Body ground Always 10 kohms or higher H9-1 or E4-11 (#20) - Body ground Always 10 kohms or higher I10-1 or E5-16 (#30) - Body ground Always 10 kohms or higher H10-1 or E4-10 (#40) - Body ground Always 10 kohms or higher I11-1 or E5-15 (#50) - Body ground Always 10 kohms or higher H11-1 or E4-9 (#60) - Body ground Always 10 kohms or higher I12-1 or E5-14 (#70) - Body ground Always 10 kohms or higher H12-1 or E4-8 (#80) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the fuel injector for port injection connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
76. CHECK CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 77 OK --> END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)
77. CHECK CAMSHAFT POSITION SENSOR Replace the camshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 78 OK --> END (CAMSHAFT POSITION SENSOR WAS DEFECTIVE)
78. CHECK VVT SENSOR Replace the VVT sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 129 OK --> END (VVT SENSOR WAS DEFECTIVE)
79. CHECK CRANKSHAFT POSITION SENSOR Check the tightening and installation condition of the crankshaft position sensor bolt. Check the connection of the crankshaft position sensor connector. OK Sensor is installed correctly. NG --> See step 127 OK: Go to next step
80. CHECK CAMSHAFT POSITION SENSOR Check the tightening and installation condition of the camshaft position sensor bolt. Check the connection of the camshaft position sensor connector. OK Sensor is installed correctly. NG --> See step 152 OK: Go to next step
81. CHECK VVT SENSOR Check the tightening and installation condition of the VVT sensor bolt. Check the connection of the VVT sensor connector. OK Sensor is installed correctly. NG --> See step 146 OK: Go to next step
82. 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 z4-3 (VC) - E3-18 (VC) 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 z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the crankshaft position sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
83. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Disconnect the camshaft 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 E66-1 (G22+) - E4-24 (G2+) Always Below 1 ohms E66-2 (G22-) - E4-32 (G2-) Always Below 1 ohms E66-3 (VC) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E66-1 (G22+) or E4-24 (G2+) - Body ground Always 10 kohms or higher E66-2 (G22-) or E4-32 (G2-) - Body ground Always 10 kohms or higher E66-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the camshaft position sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
84. 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 E30-3 (VC) - E3-18 (VC) Always Below 1 ohms E70-1 (VVR+) - E5-19 (VV2+) Always Below 1 ohms E70-2 (VVR-) - E5-29 (VV2-) Always Below 1 ohms E70-3 (VC) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E30-1 (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 E30-3 (VC) or E3-18 (VC) - 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 E70-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the VVT sensor for intake side connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
85. 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 E34-1 (EX+) - E3-26 (EV1+) Always Below 1 ohms E34-2 (EX-) - E3-33 (EV1-) Always Below 1 ohms E34-3 (VC2) - E3-18 (VC) Always Below 1 ohms E25-1 (EX+) - E6-22 (EV2+) Always Below 1 ohms E25-2 (EX-) - E6-29 (EV2-) Always Below 1 ohms E25-3 (VC2) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E34-1 (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 E34-3 (VC2) or E3-18 (VC) - 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 E25-3 (VC2) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the VVT sensor for exhaust side connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
86. CHECK CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 87 OK --> END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)
87. CHECK CAMSHAFT POSITION SENSOR Replace the camshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 88 OK --> END (CAMSHAFT POSITION SENSOR WAS DEFECTIVE)
88. CHECK VVT SENSOR Replace the VVT sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 129 OK --> END (VVT SENSOR WAS DEFECTIVE)
89. READ VALUE USING TECHSTREAM (ISC LEARNING VALUE) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / ISC Learning Value. Start the engine and warm it up until the engine coolant temperature stabilizes with the A/C switch and all the accessory switches turned off. Result Data List Item Result Suspected Area Proceed to ISC Learning Value (Engine displacement (liters) x 0.9) or more Valve timing Compression A Less than (engine displacement (liters) x 0.9) - B B --> See step 91 A: Go to next step
90. CHECK CYLINDER COMPRESSION PRESSURE Inspect the compression. Refer to «ON-VEHICLE INSPECTION - Step 9»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> REPAIR OR REPLACE ENGINE ASSEMBLY OK --> See step 154
91. INSPECT ENGINE COOLANT TEMPERATURE SENSOR Inspect the engine coolant temperature sensor. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NG --> See step 130 OK: Go to next step
92. CHECK FUEL PRESSURE HINT: For the fuel pressure inspection, refer to the following procedures. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . Attach a fuel pressure gauge and check the fuel pressure when cranking the engine and after stopping the engine. Result Vehicle State Specified Condition Cranking engine 304 to 343 kPa (3.1 to 3.5 kgf/cm 2 ) 5 minutes after stopping engine 147 kPa (1.5 kgf/cm 2 ) or more NG --> See step 98 OK: Go to next step
93. READ VALUE USING TECHSTREAM (LONG FT #1 AND LONG FT #2) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Long FT #1 and Long FT #2. Result Data List Item Result Suspected Area Proceed to Long FT #1 and Long FT #2 -15 to +15% Wire harness or connector Fuel A +15% or more, or less than -15% Fuel injector for port injection B B --> See step 147 A: Go to next step
94. PERFORM SIMULATION TEST Check if the idle speed after starting the engine is currently stable and has always been stable in the past. Result Problem Symptom Suspected Area Proceed to Current unstable idle speed or history of unstable idle speed Crankshaft position sensor system A All current and past idling speeds are stable Fuel B HINT: Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle. B --> REPLACE FUEL A: Go to next step
95. CHECK CRANKSHAFT POSITION SENSOR Check the tightening and installation condition of the crankshaft position sensor bolt. Check the connection of the crankshaft position sensor connector. OK Sensor is installed correctly. NG --> See step 148 OK: Go to next step
96. 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 z4-3 (VC) - E3-18 (VC) 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 z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the crankshaft position sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
97. CHECK CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 129 OK --> END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)
98. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. When performing the Active Test, check for fuel leakage from the fuel pipes. RESULT Result Proceed to Fuel leakage or signs of fuel leakage are present A No fuel leakage or signs of fuel leakage B HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected. B --> See step 99 A --> REPAIR OR REPLACE FUEL LINE
99. INSPECT FUEL PUMP (FOR LOW PRESSURE) Disconnect the fuel pump (for low pressure) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 4 - 5 20°C (68°F) 0.2 to 3.0 ohms HINT: Make sure there is no foreign matter such as iron particles on the fuel pump (for low pressure) and no signs that the fuel pump (for low pressure) was stuck. Make sure the internal connector is securely connected. Make sure the fuel pump filter is not clogged. Reconnect the fuel pump (for low pressure) connector. NG --> See step 149 OK --> See step 133
100. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) HINT: For the fuel pressure inspection, refer to the following procedures. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . Attach a fuel pressure gauge and check the fuel pressure after stopping the engine. Result Result Proceed to 147 kPa (1.5 kgf/cm 2 ) or higher (5 minutes after stopping the engine) A Less than 147 kPa (1.5 kgf/cm 2 ) (5 minutes after stopping the engine) B B --> See step 106 A: Go to next step
101. READ VALUE USING TECHSTREAM (LONG FT #1 AND LONG FT #2) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Long FT #1 and Long FT #2. Result Data List Item Result Suspected Area Proceed to Long FT #1 and Long FT #2 -15 to +15% Wire harness or connector Fuel A +15% or more, or less than -15% Fuel injector for port injection B B --> See step 132 A: Go to next step
102. PERFORM SIMULATION TEST Check if the idle speed after starting the engine is currently stable and has always been stable in the past. RESULT Problem Symptom Suspected Area Proceed to Current unstable idle speed or history of unstable idle speed Crankshaft position sensor system A All current and past idling speeds are stable Fuel B HINT: Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle. B --> REPLACE FUEL A: Go to next step
103. CHECK CRANKSHAFT POSITION SENSOR Check the tightening and installation condition of the crankshaft position sensor bolt. Check the connection of the crankshaft position sensor connector. OK Sensor is installed correctly. NG --> See step 148 OK: Go to next step
104. 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 z4-3 (VC) - E3-18 (VC) 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 z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the crankshaft position sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
105. CHECK CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 129 OK --> END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)
106. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed. When performing the Active Test, check for fuel leakage from the fuel pipes. RESULT Result Proceed to Fuel leakage or signs of fuel leakage are present A No fuel leakage or signs of fuel leakage B HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning. Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected. B --> See step 107 A --> REPAIR OR REPLACE FUEL LINE
107. INSPECT FUEL PUMP (FOR LOW PRESSURE) Disconnect the fuel pump (for low pressure) connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 4 - 5 20°C (68°F) 0.2 to 3.0 ohms HINT: Make sure there is no foreign matter such as iron particles on the fuel pump (for low pressure) and no signs that the fuel pump (for low pressure) was stuck. Make sure the internal connector is securely connected. Make sure the fuel pump filter is not clogged. Reconnect the fuel pump (for low pressure) connector. NG --> See step 149 OK: Go to next step
108. CHECK PURGE VSV Disconnect the vacuum hose (on the canister side) of the purge VSV. Start the engine. Idle the engine. Disconnect the purge VSV connector. Check if air flows through the purge VSV. Standard Air does not flow. Reconnect the purge VSV connector. Reconnect the vacuum hose. HINT: When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . NG --> See step 150 OK: Go to next step
109. CHECK FUEL INJECTOR FOR PORT INJECTION Clean the inside of the surge tank with compressed air. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes. Result Result Proceed to 400 ppm or higher A Less than 400 ppm B HINT: If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem. B --> See step 110 A --> See step 132
110. CHECK INTAKE VALVE Check if carbon is on the intake valves. Result Result Proceed to Carbon present A No carbon present B B --> See step 111 A --> CLEAN INTAKE VALVE
111. READ VALUE USING TECHSTREAM (ISC LEARNING VALUE) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / ISC Learning Value. Start the engine, turn off all accessory switches and warm up the engine until the engine coolant temperature stabilizes. Result Data List Item Result Suspected Area Proceed to ISC Learning Value (Engine displacement (liters) x 0.9) or more Valve timing Compression A Less than (engine displacement (liters) x 0.9) - B B --> See step 113 A: Go to next step
112. CHECK CYLINDER COMPRESSION PRESSURE Inspect the compression. Refer to «ON-VEHICLE INSPECTION - Step 9»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> REPAIR OR REPLACE ENGINE ASSEMBLY OK --> See step 151
113. INSPECT ENGINE COOLANT TEMPERATURE SENSOR Inspect the engine coolant temperature sensor. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NG --> See step 130 OK: Go to next step
114. CHECK CRANKSHAFT POSITION SENSOR Check the tightening and installation condition of the crankshaft position sensor bolt. Check the connection of the crankshaft position sensor connector. OK Sensor is installed correctly. NG --> See step 148 OK: Go to next step
115. CHECK CAMSHAFT POSITION SENSOR Check the tightening and installation condition of the camshaft position sensor bolt. Check the connection of the camshaft position sensor connector. OK Sensor is installed correctly. NG --> See step 152 OK: Go to next step
116. CHECK VVT SENSOR Check the tightening and installation condition of the VVT sensor bolt. Check the connection of the VVT sensor connector. OK Sensor is installed correctly. NG --> See step 146 OK: Go to next step
117. 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 z4-3 (VC) - E3-18 (VC) 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 z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the crankshaft position sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
118. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Disconnect the camshaft 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 E66-1 (G22+) - E4-24 (G2+) Always Below 1 ohms E66-2 (G22-) - E4-32 (G2-) Always Below 1 ohms E66-3 (VC) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E66-1 (G22+) or E4-24 (G2+) - Body ground Always 10 kohms or higher E66-2 (G22-) or E4-32 (G2-) - Body ground Always 10 kohms or higher E66-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the camshaft position sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
119. 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 E30-3 (VC) - E3-18 (VC) Always Below 1 ohms E70-1 (VVR+) - E5-19 (VV2+) Always Below 1 ohms E70-2 (VVR-) - E5-29 (VV2-) Always Below 1 ohms E70-3 (VC) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E30-1 (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 E30-3 (VC) or E3-18 (VC) - 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 E70-3 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the VVT sensor for intake side connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
120. 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 E34-1 (EX+) - E3-26 (EV1+) Always Below 1 ohms E34-2 (EX-) - E3-33 (EV1-) Always Below 1 ohms E34-3 (VC2) - E3-18 (VC) Always Below 1 ohms E25-1 (EX+) - E6-22 (EV2+) Always Below 1 ohms E25-2 (EX-) - E6-29 (EV2-) Always Below 1 ohms E25-3 (VC2) - E3-18 (VC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E34-1 (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 E34-3 (VC2) or E3-18 (VC) - 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 E25-3 (VC2) or E3-18 (VC) - Body ground Always 10 kohms or higher HINT: Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur. Make sure there is not an excessive amount of force applied to the wire harness. Reconnect the ECM connector. Reconnect the VVT sensor for exhaust side connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
121. CHECK CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 122 OK --> END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)
122. CHECK CAMSHAFT POSITION SENSOR Replace the camshaft position sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 123 OK --> END (CAMSHAFT POSITION SENSOR WAS DEFECTIVE)
123. CHECK VVT SENSOR Replace the VVT sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check the engine start operation. OK Malfunction has been repaired successfully. NG --> See step 129 OK --> END (VVT SENSOR WAS DEFECTIVE)
124. 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)
125. REPAIR ENGINE IMMOBILISER SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/lexus/is-f/i-2007-2014/remont/door-locks-anti-theft-systems/#engine-immobiliser-diagnostics-introduction__how-to-proceed-with-troubleshooting)
126. 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)
127. SECURELY REINSTALL CRANKSHAFT POSITION SENSOR. Refer to «INSTALLATION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
128. REPLACE CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
129. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
130. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
131. CHECK 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)
132. REPLACE FUEL INJECTOR FOR PORT INJECTION. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information__removal)
133. REPLACE PRESSURE REGULATOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
134. CLEAN OR REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
135. REPLACE DRIVE PLATE AND RING GEAR. Refer to «REMOVAL - Step 84»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
136. INSPECT STARTER ASSEMBLY. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/starter/#starting-service-information)
137. REPLACE STARTER ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/starter/#starting-service-information)
138. REPLACE SPARK PLUG. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
139. CHECK CRANKSHAFT POSITION SENSOR CIRCUIT. Refer to «DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0337: Crankshaft Position Sensor "A" Circuit Low Input; DTC P0338: Crankshaft Position Sensor "A" Circuit High Input; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0201-p0657)
140. CHECK VVT-IE SYSTEM. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
141. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
142. REPLACE MASS AIR FLOW METER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
143. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
144. REPLACE SPARK PLUG (ABNORMAL CYLINDER). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
145. REPLACE SPARK PLUG (ALL CYLINDER). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
146. SECURELY REINSTALL VVT SENSOR. Refer to «INSTALLATION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
147. REPLACE FUEL INJECTOR FOR PORT INJECTION. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information__removal)
148. SECURELY REINSTALL CRANKSHAFT POSITION SENSOR. Refer to «INSTALLATION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
149. REPLACE FUEL PUMP (FOR LOW PRESSURE). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
150. INSPECT PURGE VSV. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/auxiliary-emission-control-systems/#emission-control-service-information)
151. ADJUST VALVE TIMING. Refer to «REASSEMBLY - Step 24»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
152. SECURELY REINSTALL CAMSHAFT POSITION SENSOR. Refer to «INSTALLATION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
153. REPLACE IGNITION COIL. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
154. CHECK VALVE TIMING. Refer to «PROCEDURE - Step 3»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193)

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 standard, the ECM will illuminate the MIL and set a DTC immediately.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

Scheme 62

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: P1607.
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.

PROCEDURE

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 for more than 1 minute. Connect the cable to the negative (-) battery terminal. Turn the engine switch on (IG). Check for DTC. OK P1607 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)

SYSTEM DESCRIPTION

The throttle actuator is operated by the ECM and opens and closes the throttle valve using gears.

The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body assembly. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT

This electronic throttle control system does not use a throttle cable.

MONITOR DESCRIPTION

The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this value. If the current is outside the standard range, the ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and sets a DTC.

1. Example: When the electrical current is more than 7 A, or less than 0.5 A and the throttle actuator duty ratio exceeds 80%, the ECM interprets this as the current being outside the standard range, and illuminates the MIL and sets a DTC. If the malfunction is not repaired successfully, a DTC is set when the engine is quickly revved to a high rpm several times after the engine has idled for 5 seconds after engine start.

ALL

P2102

P2103

P2102

P2103

Scheme 63

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. With the vehicle stationary, fully depress the accelerator pedal and quickly release it [B].
8. Check that 16 seconds or more have elapsed from the instant when the accelerator pedal is first depressed.
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: P2102 or P2103.
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, 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 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.

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to electronic throttle control system malfunctions, is set, the ECM enters fail safe mode. During fail safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 7° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the engine switch is then turned off.

Scheme 64

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. The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Open Duty/Throttle Motor Close Duty) can be read using the Techstream. However, the ECM shuts off the throttle actuator current when the electronic throttle control system malfunctions.

Scheme 65

1. INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR) Disconnect the throttle body assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 (M+) - 1 (M-) 20°C (68°F) 0.3 to 100 ohms Reconnect the throttle body assembly connector. NG --> See step 5 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (THROTTLE ACTUATOR - ECM) Disconnect the throttle body assembly 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 E17-2 (M+) - E4-7 (M+) Always Below 1 ohms E17-1 (M-) - E4-6 (M-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E17-2 (M+) or E4-7 (M+) - Body ground Always 10 kohms or higher E17-1 (M-) or E4-6 (M-) - Body ground Always 10 kohms or higher Reconnect the throttle body assembly connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) Check for foreign objects between the throttle valve and the housing. OK No foreign objects between throttle valve and housing. NG --> REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY ASSEMBLY OK: Go to next step
4. INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE) Check if the throttle valve opens and closes smoothly. OK Throttle valve opens and closes smoothly. NG --> See step 6 OK --> See step 7
5. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
6. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
7. 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 (ETCS).

The ETCS is comprised of a throttle actuator, which operates the throttle valve, and a throttle position sensor, which detects the opening amount of the throttle valve.

The ECM controls the throttle actuator to adjust the throttle valve opening amount so that the idle speed is maintained at the target idle speed.

If there are deposits in the throttle valve, the necessary ISC flow rate for idling is maintained using the ISC learning value and feedback as a decrease in the ISC flow rate may cause engine stall or unstable idling. The ECM stores this DTC if the ISC learning value approaches its limit.

HINT

1. Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

1. Since a pending DTC is not stored for this DTC, it takes time to confirm whether the malfunction has been successfully repaired by checking for this DTC. When confirming whether the malfunction has been successfully repaired, compare "ISC Learning Value" recorded in the freeze frame data with "ISC Learning Value" in the Data List after repairs have been made to save time.

Scheme 66

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P2109) 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 P2109 is output A DTC P2109 and other DTCs are output B HINT: If any DTCs other than P2109 are output, troubleshoot those DTCs first. B --> See step 5 A: Go to next step
2. CHECK FREEZE FRAME DATA Connect the Techstream to the DLC3. Turn the engine switch on (IG). Using the Techstream, check "ISC Learning Value" in the freeze frame data. Refer to «FREEZE FRAME DATA»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . HINT: Be sure to confirm "ISC Learning Value" in the freeze frame data as it is used when confirming whether the malfunction has been successfully repaired. NEXT: Go to next step
3. REMOVE FOREIGN OBJECT (CLEAN THROTTLE BODY ASSEMBLY) Clean off any deposits from the inside of the throttle body assembly. Push open the throttle valve and wipe off any carbon from the valve and bore using a cloth soaked in non-residue solvent. NOTE: Make sure that the cloth or your fingers do not get caught in the valve. Make sure that foreign matter does not enter the throttle valve. Do not directly apply non-residue solvent to the throttle body assembly or wash the throttle body assembly. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems. If there is coating material on the edge of the valve, be careful not to remove it. Push the throttle valve open gently with your finger and check that the throttle valve moves smoothly. NEXT: Go to next step
4. READ VALUE USING TECHSTREAM (ISC LEARNING VALUE) Remove the EFI and ETCS fuses at the same time, wait 60 seconds or more, and then reinstall the fuses to reset the ISC learning value. Start the engine and fully warm it up. Leave the vehicle idling for 3 minutes or more and check that the engine speed is at the standard idle speed. HINT: Check the freeze frame data and make sure that the vehicle conditions are the same as when the DTC was stored. Using the Techstream, confirm "ISC Learning Value". OK The value is half of "ISC Learning Value" recorded in the freeze frame data or less. NG --> See step 6 OK --> END
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. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The throttle actuator is operated by the ECM, and opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body assembly. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT

The electronic throttle control system does not use a throttle cable.

The ECM determines that there is a malfunction in the electronic throttle control system when the throttle valve remains at a fixed angle despite a high drive current from the ECM. The ECM illuminates the MIL and sets a DTC.

If the malfunction is not repaired successfully, a DTC is set when the accelerator pedal is fully depressed and released quickly (to fully open and close the throttle valve) after the engine is next started.

ALL

P2111 (THROTTLE ACTUATOR STUCK OPEN)

P2112 (THROTTLE ACTUATOR STUCK CLOSED)

P2111 (THROTTLE ACTUATOR STUCK OPEN)

P2112 (THROTTLE ACTUATOR STUCK CLOSED)

Scheme 67

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 fully depress and release the accelerator pedal quickly (to fully open and close the throttle valve).
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: P2111 or P2112.
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 [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.

When either of these DTCs, as well as other DTCs relating to electronic throttle control system malfunctions, is set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts off the current to the throttle actuator, and the throttle valve is returned to a 7° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the engine switch is then turned off.

WIRING DIAGRAM

Refer to DTC P2102. Refer to WIRING DIAGRAM .

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. INSPECT 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 3 OK: Go to next step
2. CHECK WHETHER DTC OUTPUT RECURS (DTC P2111 OR P2112) 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) . Start the engine, and fully depress and release the accelerator pedal quickly (to fully open and close the throttle valve). Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P2111 or P2112 is output B B --> See step 4 A --> See step 5
3. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
4. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
5. 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 electronic throttle control system has a dedicated power supply circuit. When the monitored voltage (+BM) is low (less than 4 V), the ECM determines that there is a malfunction in the electronic throttle control system and cuts off the current to the throttle actuator.

When the voltage becomes unstable, the electronic throttle control system itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the engine switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.

HINT

The electronic throttle control system does not use a throttle cable.

Scheme 68

The ECM monitors the battery supply voltage applied to the throttle actuator.

When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM illuminates the MIL and sets the DTC.

If the malfunction is not repaired successfully, the DTC is set 5 seconds after the engine is next started.

COMPONENT OPERATING RANGE

Scheme 69

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. Slowly depress the accelerator pedal, raise the engine speed to approximately 3000 rpm over approximately 5 seconds, and then idle the engine [B].
8. Check that 16 seconds or more have elapsed since the engine was started.
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: P2118.
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, 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 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.

When this DTC, as well as other DTCs relating to electronic throttle control system malfunctions, is set, the ECM enters fail safe mode. During fail safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 7° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail safe mode continues until a pass condition is detected, and the engine switch is then turned off.

Scheme 70

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 71

1. READ VALUE USING TECHSTREAM (+BM VOLTAGE) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / +BM voltage. Read the value displayed on the Techstream. Standard Voltage 11 to 14 V NG --> See step 2 OK --> See step 3
2. INSPECT ECM (+BM VOLTAGE) Disconnect the ECM connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E3-1 (+BM) - Body ground Always 11 to 14 V Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition E4-5 (ME01) - Body ground Always Below 1 ohms E6-1 (E1) - Body ground Always Below 1 ohms Reconnect the ECM connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BATTERY, BODY GROUND) OK --> See step 4
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)
4. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The Electronic Throttle Control System (ETCS) is composed of the throttle actuator, throttle position sensor, accelerator pedal position sensor, and ECM. The ECM operates the throttle actuator to regulate the throttle valve in response to driver inputs. The throttle position sensor detects the opening angle of the throttle valve, and provides the ECM with feedback so that the throttle valve can be appropriately controlled by the ECM.

The ECM determines the actual opening angle of the throttle valve from the throttle position sensor signal. The actual opening angle is compared to the target opening angle commanded by the ECM. If the difference between these two values is outside the standard range, the ECM interprets this as a malfunction in the electronic throttle control system. The ECM then illuminates the MIL and sets the DTC.

If the malfunction is not repaired successfully, the DTC is set when the accelerator pedal is quickly released (to close the throttle valve) after the engine speed reaches 5000 rpm by fully depressing the accelerator pedal (fully open the throttle valve).

Scheme 72

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.
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [B]. 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: P2119.
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, fully depress and release the accelerator pedal 3 times.
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.

When this DTC, as well as other DTCs relating to electronic throttle control system malfunctions, is set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 7° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the engine switch is then turned off.

Refer to DTC P2102. Refer to WIRING DIAGRAM .

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 73

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2119) 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 P2119 is output A DTC P2119 and other DTCs are output B HINT: If any DTCs other than P2119 are output, troubleshoot those DTCs first. B --> See step 5 A: Go to next step
2. INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR) Disconnect the throttle body assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 (M+) - 1 (M-) 20°C (68°F) 0.3 to 100 ohms Reconnect the throttle body assembly connector. NG --> See step 6 OK: Go to next step
3. 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
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2119) 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) . Allow the engine to idle for 15 seconds or more. Fully depress and release the accelerator pedal several times quickly. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. OK No DTC output. HINT: The output voltage of the throttle position sensor can be checked using the Techstream. Variations in the output voltage indicate that the throttle actuator is in operation. To check the output voltage using the Techstream, enter the following menus: Powertrain / Engine / Data List / Throttle Position No. 1. NG --> See step 6 OK --> END
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. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The electronic throttle control system does not use a throttle cable.

The accelerator pedal position sensor is mounted on the accelerator pedal bracket and has 2 sensor circuits: VPA (main) and VPA2 (sub). This sensor is a non-contact type, and uses Hall-effect elements, in order to yield accurate signals, even in extreme driving conditions, such as at high speeds as well as very low speeds. The voltage, which is applied to terminals VPA and VPA2 of the ECM, varies between 0 V and 5 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal opening angle (throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the VPA circuit and is used to check the accelerator pedal position sensor itself.

The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the signals from VPA and VPA2, and controls the throttle actuator according to these signals.

Scheme 74

HINT

When any of these DTCs are set, check the accelerator pedal position sensor voltage by entering the following menus: Powertrain / Engine / Data List / ETCS / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.

HINT

Accelerator pedal positions are expressed as voltages.

1. When either of the output voltages of VPA or VPA2 deviates from the standard range, or the difference between the output voltages of the 2 sensor circuits is less than the threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and sets a DTC. Example: When the output voltage of VPA drops 0.4 V or less for 0.5 seconds or more when the accelerator pedal is fully depressed, DTC P2122 is set. If the malfunction is not repaired successfully, a DTC is set 2 seconds after the engine is next started.

P2120

P2122

P2123

P2125

P2127

P2128

P2138

Scheme 75

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. Fully depress and release the accelerator pedal [B].
7. Check that 5 seconds or more have elapsed since the engine switch was turned on (IG).
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: P2120, P2122, P2123, P2125, P2127, P2128 or P2138.
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.

When any of DTCs P2120, P2121, P2122, P2123, P2125, P2127, P2128 and P2138 are set, the ECM enters fail-safe mode. If either of the 2 sensor circuits malfunctions, the ECM uses the remaining circuit to calculate the accelerator pedal position to allow the vehicle to continue driving. If both of the circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the engine idles.

Fail-safe mode continues until a pass condition is detected, and the engine switch is then turned off.

Scheme 76

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.

1. These DTCs relate to the accelerator pedal position sensor.

Scheme 77

Scheme 78

1. READ VALUE USING TECHSTREAM (ACCELERATOR POSITION SENSOR) 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 / ETCS / Accel Sensor Out No. 1 and Accel Sensor Out No. 2. Read the value displayed on the Techstream. Standard Voltage Accelerator Pedal Operation Accel Sensor Out No. 1 Accel Sensor Out No. 2 Released 0.5 to 1.1 V 1.2 to 2.6 V Depressed 2.6 to 4.5 V 3.4 to 4.8 V NG --> See step 3 OK: Go to next step
2. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR POSITION SENSOR DTCS) 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) . Start the engine. Allow the engine to idle for 15 seconds. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P2120, P2122, P2123, P2125, P2127, P2128, and/or P2138 are output A DTC is not output B B --> See step 7 A --> See step 8
3. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) Disconnect the accelerator pedal 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 A26-6 (VPA) - A5-29 (VPA) Always Below 1 ohms A26-5 (EPA) - A5-20 (EPA) Always Below 1 ohms A26-4 (VCPA) - A5-23 (VCPA) Always Below 1 ohms A26-3 (VPA2) - A5-28 (VPA2) Always Below 1 ohms A26-2 (EPA2) - A5-21 (EPA2) Always Below 1 ohms A26-1 (VCP2) - A5-22 (VCP2) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A26-6 (VPA) or A5-29 (VPA) - body ground Always 10 kohms or higher A26-5 (EPA) or A5-20 (EPA) - body ground Always 10 kohms or higher A26-4 (VCPA) or A5-23 (VCPA) - body ground Always 10 kohms or higher A26-3 (VPA2) or A5-28 (VPA2) - body ground Always 10 kohms or higher A26-2 (EPA2) or A5-21 (EPA2) - body ground Always 10 kohms or higher A26-1 (VCP2) or A5-22 (VCP2) - body ground Always 10 kohms or higher Reconnect the accelerator pedal position sensor connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT ECM (VCPA AND VCP2 VOLTAGE) Disconnect the accelerator pedal position 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 A5-23 (VCPA) - A5-20 (EPA) Engine switch on (IG) 4.5 to 5.0 V A5-28 (VCP2) - A5-21 (EPA2) Engine switch on (IG) 4.5 to 5.0 V Reconnect the accelerator pedal position sensor connector. NG --> See step 9 OK: Go to next step
5. REPLACE ACCELERATOR PEDAL ASSEMBLY Replace the accelerator pedal assembly. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
6. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) 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) . Start the engine. Allow the engine to idle for 15 seconds. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTCs P2120, P2122, P2123, P2125, P2127, P2128, and/or P2138 are output A DTC is not output B B --> END A --> See step 9
7. 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)
8. REPLACE ECM. 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)

Refer to DTC P2120. Refer to DESCRIPTION .

The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal position sensor has 2 sensor elements and 2 signal outputs: VPA and VPA2. VPA is used to detect the actual accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA. When the difference between the output voltages of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal position sensor is malfunctioning. The ECM turns on the MIL and the DTC is set.

Scheme 79

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. Fully depress and release the accelerator pedal [B].
7. Check that 20 seconds or more have elapsed since the engine switch was turned on (IG).
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: P2121.
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.

The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in either of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor circuits and switches to limp mode. In limp mode, the functioning circuit is used to calculate the accelerator pedal opening angle to allow the vehicle to continue driving. If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal as being fully closed. In this case, the throttle valve remains closed as if the engine is idling.

If a pass condition is detected and then the engine switch is turned off, the fail safe operation stops and the system returns to a normal condition.

Refer to DTC P2120. Refer to WIRING DIAGRAM .

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. This DTC relates to the accelerator pedal position sensor.

1. READ VALUE USING TECHSTREAM (ACCELERATOR POSITION SENSOR) See step 1 NG --> See step 3 OK: Go to next step
2. INSPECT WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTC) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Clear DTC. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Start the engine. Allow the engine to idle for 15 seconds. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P2121 is output A DTC is not output B B --> See step 5 A --> See step 6
3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY Replace the accelerator pedal rod assembly. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTC) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Clear DTC. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Start the engine. Allow the engine to idle for 15 seconds. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTC. Result Result Proceed to DTC P2121 is output A DTC is not output B B --> END A --> See step 6
5. 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)
6. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

HINT

1. Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
2. Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

The air fuel ratio sensor generates a voltage* that corresponds to the actual air fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio level, and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.

The air fuel ratio sensor is the planar type and is integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are narrower than the conventional type. The heat generated by the heater is conducted to the solid electrolyte through the alumina, therefore the sensor activation is accelerated.

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric level.

*: Value changes inside the ECM. Since the air fuel ratio sensor is the current output element, a current is converted into a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.

Scheme 80

HINT

1. DTCs P2195 and P2196 indicate malfunctions related to bank 1 air fuel ratio sensor circuit.
2. DTCs P2197 and P2198 indicate malfunctions related to bank 2 air fuel ratio sensor circuit.
3. Bank 1 refers to the bank that includes No. 1 cylinder.
4. Bank 2 refers to the bank that includes No. 2 cylinder.
5. When any of these DTCs are set, check the air fuel ratio sensor voltage output by entering the following menus: Powertrain / Engine / Data List / A/F Control System / AFS Voltage B1S1 or AFS Voltage B2S1.
6. Short-term fuel trim values can also be read using the Techstream.
7. The ECM regulates the voltages at the A1A+, A2A+, A1A- and A2A- terminals of the ECM to a constant level. Therefore, the air fuel ratio sensor voltage output cannot be confirmed without using the Techstream.
8. If an air fuel ratio sensor malfunction is detected, the ECM sets a DTC.

Sensor voltage detection monitor

Under the air fuel ratio feedback control, if the air fuel ratio sensor voltage output indicates rich or lean for a certain period of time, the ECM determines that there is a malfunction in the air fuel ratio sensor. The ECM illuminates the MIL and sets a DTC.

Example

If the air fuel ratio sensor voltage output is less than 2.8 V (very rich condition) and heated oxygen sensor output voltage falls from 0.59 V or more to less than 0.21 V for 5 seconds, the ECM sets DTC P2196 or P2198. Alternatively, if the air fuel ratio sensor voltage output is more than 3.8 V (very lean condition) and heated oxygen sensor output voltage rises from less than 0.21 V to 0.59 V or more for 5 seconds, DTC P2195 or P2197 is set.

Sensor current detection monitor

A rich air fuel mixture causes a low air fuel ratio sensor current, and a lean air fuel mixture causes a high air fuel ratio sensor current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor current during fuel cut and detects any abnormal current values.

If the air fuel ratio sensor output is 3.6 mA or more for more than 3 seconds of cumulative time, the ECM interprets this as a malfunction in the air fuel ratio sensor and sets DTC P2195 or P2197 (high-side stuck). If the air fuel ratio sensor output is less than 1.4 mA for more than 3 seconds of cumulative time, the ECM sets DTC P2196 or P2198 (low-side stuck).

Scheme 81

ALL

SENSOR VOLTAGE DETECTION MONITOR (LEAN SIDE MALFUNCTION P2195, P2197)

SENSOR VOLTAGE DETECTION MONITOR (RICH SIDE MALFUNCTION P2196, P2198)

SENSOR CURRENT DETECTION MONITOR (P2195, P2196, P2197, P2198)

SENSOR VOLTAGE DETECTION MONITOR (LEAN SIDE MALFUNCTION P2195, P2197)

SENSOR VOLTAGE DETECTION MONITOR (RICH SIDE MALFUNCTION P2196, P2198)

SENSOR CURRENT DETECTION MONITOR (HIGH SIDE MALFUNCTION P2195, P2197)

SENSOR CURRENT DETECTION MONITOR (LOW SIDE MALFUNCTION P2196, P2198)

MONITOR RESULT

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

CONFIRMATION DRIVING PATTERN

This confirmation driving pattern is used in the "Perform Confirmation Driving Pattern" procedure of the following diagnostic troubleshooting procedure.

Scheme 82

Scheme 83

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
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. Start the engine, and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
8. On the Techstream, enter the following menus to check the fuel-cut status: Powertrain / Engine / Data List / Idle Fuel Cut.
9. Drive the vehicle at between 37 and 75 mph (60 and 120 km/h) for at least 10 minutes [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
10. Shift the transmission to 2nd gear [C].
11. Accelerate the vehicle to 37 mph (60 km/h) or more by depressing the accelerator pedal for at least 10 seconds [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
12. Soon after performing step [D] above, release the accelerator pedal for at least 5 seconds without depressing the brake pedal in order to execute fuel-cut control [E]. HINT: Fuel-cut is performed when the following conditions are met: Accelerator pedal is fully released. Engine speed is 2500 rpm or more (fuel injection returns at 1000 rpm).
13. Allow the vehicle to decelerate until the vehicle speed decreases to less than 6 mph (10 km/h).
14. Repeat steps [C] through [E] above at least 3 times in one driving cycle.
15. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
16. Read the pending DTC [F]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
17. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
18. Input the DTC: P2195, P2196, P2197 or P2198.
19. 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 [B] through [E] again.
20. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
21. 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.
22. 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 84

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 (HO2) 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 85

Scheme 86

Scheme 87

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

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. A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
3. A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 88

Scheme 89

Scheme 90

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P2195, P2196, P2197 OR P2198) 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 P2195, P2196, P2197 or P2198 is output A DTC P2195, P2196, P2197 or P2198 and other DTCs are output B HINT: If any DTCs relating to the air fuel ratio sensor (DTCs for the air fuel ratio sensor heater or air fuel ratio sensor admittance) are output, troubleshoot those DTCs first. B --> See step 20 A: Go to next step
2. READ VALUE USING TECHSTREAM (TEST VALUE OF AIR FUEL RATIO SENSOR) 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). Drive the vehicle in accordance with the drive pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine / Monitor / O2 Sensor. Check that the status of O2 Sensor is Complete. If the status is still Incomplete, perform the driving pattern increasing the vehicle speed and using the second gear to decelerate the vehicle. Enter the following menus: Powertrain / Engine / Monitor / O2 Sensor / Details / RANGE B1S1 or RANGE B2S1. Check the test value of the air fuel ratio sensor output current during fuel cut. Result Test Value Proceed to Within normal range (1.4 mA or more, and less than 3.6 mA) A Outside normal range (Less than 1.4 mA, or 3.6 mA or more) B B --> See step 17 A: Go to next step
3. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF AIR FUEL RATIO SENSOR) Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds. Enter the following menus: Powertrain / Engine / Data List / All Data / AFS Voltage B1S1 or AFS Voltage B2S1 and Engine Speed, then press the Record button. Check the air fuel ratio sensor voltage three times, when the engine is in each of the following conditions: While idling (check for at least 30 seconds) (Step "A"). At an engine speed of approximately 2500 rpm (without any sudden changes in engine speed) (Step "B"). Raise the engine speed to 4000 rpm and then quickly release the accelerator pedal so that the throttle valve is fully closed (Step "C"). Standard Condition Air Fuel Ratio Sensor Voltage Variation Reference Step "A" and "B" Remains at approximately 3.3 V Between 3.1 V and 3.5 V Step "C" Increases to 3.8 V or more This occurs during engine deceleration (when fuel cut performed) HINT: For more information, see the diagrams below. HINT: If the output voltage of the air fuel ratio sensor remains at approximately 3.3 V (Scheme 85) under any conditions, including those above, the air fuel ratio sensor may have an open circuit. (This will also happen if the air fuel ratio sensor heater has an open circuit.) If the output voltage of the air fuel ratio sensor remains at either approximately 3.8 V or more, or 2.8 V or less (Scheme 85) under any conditions, including those above, the air fuel ratio sensor may have a short circuit. The ECM stops fuel injection (fuel cut) during engine deceleration. This causes a lean condition and results in a momentary increase in the air fuel ratio sensor output voltage. When the vehicle is driven: The output voltage of the air fuel ratio sensor may be below 2.8 V during fuel enrichment. For the vehicle, this translates to a sudden increase in speed with the accelerator pedal fully depressed when trying to overtake another vehicle. The air fuel ratio sensor is functioning normally. The air fuel ratio sensor is a current output element; therefore, the current is converted into a voltage inside the ECM. Measuring the voltage at the connectors of the air fuel ratio sensor or ECM will show a constant voltage result. NG --> See step 10 OK: Go to next step
4. PERFORM CONFIRMATION DRIVING PATTERN 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 wait for 30 seconds. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
5. CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198) Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P2195, P2196, P2197 or P2198. Check the DTC judgment result. Result Result Proceed to ABNORMAL (DTC P2195, P2196, P2197 or P2198 is output) A NORMAL (DTC is not output) B B --> See step 9 A: Go to next step
6. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information). NEXT: Go to next step
7. PERFORM CONFIRMATION DRIVING PATTERN 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 wait for 30 seconds. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198) Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P2195, P2196, P2197 or P2198. Check the DTC judgment result. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P2195, P2196, P2197 or P2198 is output) B B --> See step 21 A --> END
9. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST Has the vehicle run out of fuel in the past? NO --> See step 22 YES --> DTC CAUSED BY RUNNING OUT OF FUEL
10. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Disconnect the air fuel ratio sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Bank 1 Sensor 1) Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA1A) - 4 (A1A-) Always 10 kohms or higher Standard Resistance (Bank 2 Sensor 1) Tester Connection Condition Specified Condition 1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA2A) - 4 (A2A-) Always 10 kohms or higher Reconnect the air fuel ratio sensor connector. NG --> See step 23 OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) Disconnect the air fuel ratio 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 E42-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V E38-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V Turn the engine switch off. 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 E42-1 (HA1A) - E6-5 (HA1A) Always Below 1 ohms E42-3 (A1A+) - E5-23 (A1A+) Always Below 1 ohms E42-4 (A1A-) - E5-22 (A1A-) Always Below 1 ohms E38-1 (HA2A) - E6-6 (HA2A) Always Below 1 ohms E38-3 (A2A+) - E5-21 (A2A+) Always Below 1 ohms E38-4 (A2A-) - E5-20 (A2A-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E42-1 (HA1A) or E6-5 (HA1A) - Body ground Always 10 kohms or higher E42-3 (A1A+) or E5-23 (A1A+) - Body ground Always 10 kohms or higher E42-4 (A1A-) or E5-22 (A1A-) - Body ground Always 10 kohms or higher E38-1 (HA2A) or E6-6 (HA2A) - Body ground Always 10 kohms or higher E38-3 (A2A+) or E5-21 (A2A+) - Body ground Always 10 kohms or higher E38-4 (A2A-) or E5-20 (A2A-) - Body ground Always 10 kohms or higher Reconnect the air fuel ratio sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
12. CHECK INTAKE SYSTEM Check the air induction system for vacuum leaks. OK No leaks in the intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
13. 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 --> REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step
14. INSPECT FUEL INJECTOR ASSEMBLY FOR PORT INJECTION Check the injector injection (for port injection) (whether fuel volume is high or low, and whether injection pattern is poor). Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information). NG --> See step 24 OK: Go to next step
15. CHECK FUEL PRESSURE (HIGH PRESSURE SIDE) Check the fuel pressure (high pressure side). Refer to «ON-VEHICLE INSPECTION - Step 3»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection). NG --> See step 25 OK: Go to next step
16. INSPECT FUEL INJECTOR ASSEMBLY FOR DIRECT INJECTION Check the fuel injector (for direct injection). Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information). NG --> See step 26 OK: Go to next step
17. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information). NEXT: Go to next step
18. PERFORM CONFIRMATION DRIVING PATTERN 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 wait for 30 seconds. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
19. CHECK WHETHER DTC OUTPUT RECURS (DTC P2195, P2196, P2197 OR P2198) Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P2195, P2196, P2197 or P2198. Check the DTC judgment result. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P2195, P2196, P2197 or P2198 is output) B B --> See step 21 A --> END
20. 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)
21. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
22. 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)
23. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
24. REPLACE FUEL INJECTOR ASSEMBLY FOR PORT INJECTION. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information__removal)
25. REPLACE FUEL PRESSURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
26. REPLACE FUEL INJECTOR ASSEMBLY FOR DIRECT INJECTION. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)

CAUTION / NOTICE / HINT

HINT

1. Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
2. Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located near the engine assembly.

The air fuel ratio sensor, which is located between the exhaust manifold and catalyst, consists of alloyed metal elements and a heater.

Depending on the engine operating conditions, the heater heats the sensor elements to activate them. Battery voltage is applied to the heater, the sensor ground is controlled by the ECM using a duty ratio.

The sensor elements convert the oxygen concentration in the exhaust gas into voltage values to output. Based on the voltage, the ECM determines the air fuel ratio and regulates the fuel injection volume depending on the air fuel ratio and engine operating conditions. The voltage changes between 0.6 V and 4.5 V while the engine is running. If the air fuel ratio is lean, which means the oxygen concentration in the exhaust gas is high, the voltage is high. If the air fuel ratio is rich, which means the oxygen concentration in the exhaust gas is low, the voltage is low.

These DTCs are output when there is an open or short in the air fuel ratio sensor circuit, or if air fuel ratio sensor output drops. To detect these problems, the voltage of the air fuel ratio sensor is monitored when turning the engine switch on (IG), and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the air fuel ratio sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM will determine that there is a malfunction in the air fuel ratio sensor. If the same malfunction is detected in next driving cycle, the MIL will be illuminated and a DTC will be stored.

P2237 AND P2240 (AIR FUEL RATIO SENSOR OPEN CIRCUIT BETWEEN A1A+ (A2A+) AND A1A- (A2A-))

P2238 AND P2241 (AIR FUEL RATIO SENSOR LOW IMPEDANCE)

OTHER

P2237 AND P2240 (AIR FUEL RATIO SENSOR OPEN CIRCUIT BETWEEN A1A+ (A2A+) AND A1A- (A2A-))

P2238 AND P2241 (AIR FUEL RATIO SENSOR LOW IMPEDANCE)

P2238 AND P2241 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A+ (A2A+) AND GND)

P2239 AND P2242 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A+ (A2A+) AND +B)

P2252 AND P2255 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A- (A2A-) AND GND)

P2253 AND P2256 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A- (A2A-) AND +B)

P2238 AND P2241 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A+ (A2A+) AND A1A- (A2A-))

Scheme 91

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 2 minutes.
7. Enter the following menus: Powertrain / Engine / Trouble Codes.
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: P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255 or P2256.
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, idle the engine for 3 minutes.
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.

Refer to DTC P2195. Refer to WIRING DIAGRAM .

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 (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2) 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)

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 / 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.

1. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) Disconnect the air fuel ratio 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 E42-1 (HA1A) - E6-5 (HA1A) Always Below 1 ohms E42-3 (A1A+) - E5-23 (A1A+) Always Below 1 ohms E42-4 (A1A-) - E5-22 (A1A-) Always Below 1 ohms E38-1 (HA2A) - E6-6 (HA2A) Always Below 1 ohms E38-3 (A2A+) - E5-21 (A2A+) Always Below 1 ohms E38-4 (A2A-) - E5-20 (A2A-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E42-1 (HA1A) or E6-5 (HA1A) - Body ground Always 10 kohms or higher E42-3 (A1A+) or E5-23 (A1A+) - Body ground Always 10 kohms or higher E42-4 (A1A-) or E5-22 (A1A-) - Body ground Always 10 kohms or higher E38-1 (HA2A) or E6-6 (HA2A) - Body ground Always 10 kohms or higher E38-3 (A2A+) or E5-21 (A2A+) - Body ground Always 10 kohms or higher E38-4 (A2A-) or E5-20 (A2A-) - Body ground Always 10 kohms or higher Reconnect the air fuel ratio sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
3. CHECK WHETHER DTC OUTPUT RECURS 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) . Start the engine. Allow the engine to idle for 5 minutes or more. Enter the following menus: Powertrain / Engine / Trouble Codes. Read pending DTCs. Result Result Proceed to DTC is not output A DTC P2237, P2240, P2238, P2241, P2239, P2242, P2252, P2255, P2253 and/or P2256 are output B B --> See step 4 A --> END
4. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

DTC SUMMARY

HINT

The vent valve is built into the canister pump module.

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

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 92

P2420: Vent valve stuck open (vent)

In operation C, the vent valve turns ON (closed) and the EVAP system pressure is then measured by the ECM, using the canister pressure sensor, to conduct an EVAP leak check. If the pressure does not increase when the vent valve is open, the ECM interprets this as the vent valve being stuck open. The ECM illuminates the MIL and sets the DTC.

Scheme 93

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

Scheme 94

Note. The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by Techstream. It takes a maximum of the 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 at least 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on.
6. Enter the following menu items: 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: P2420.
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 soak timer operates after the engine switch is turned off. When a certain amount of time has elapsed after turning the engine switch off, the soak timer activates the ECM to perform malfunction checks witch can only be performed after the engine is stopped. The soak timer is built into the ECM.

Scheme 95

If the soak timer activates the ECM even though only a short amount of time has elapsed since the engine switch was turned off, or if the soak timer does not activate the ECM even though a considerable amount of time has elapsed since the engine switch was turned off, the ECM determines that the soak timer is malfunctioning, illuminates the MIL and stores a DTC the next time the engine switch is turned on (IG). While the engine is running, the ECM monitors the synchronization of the soak timer and the CPU clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the MIL and sets the DTC (2 trip detection logic).

ALL

CASE 1

CASE 2

CASE 3

CASE 1

CASE 2

CASE 3

Scheme 96

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 minutes or more.
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: P2610.
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.

HINT

1. DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM replacement is necessary.
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. 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
2. 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 and wait for 10 minutes or more. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending. If no pending DTC is displayed, the repair has been successfully completed. NEXT --> END

Refer to DTC P2195. Refer to DESCRIPTION .

HINT

1. DTC P2A00 indicates malfunctions related to the bank 1 air fuel ratio sensor.
2. DTC P2A03 indicates malfunctions related to the bank 2 air fuel ratio sensor.
3. Bank 1 refers to the bank that includes No. 1 cylinder.
4. Bank 2 refers to the bank that includes No. 2 cylinder.
5. Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

After engine is warmed up, the ECM performs air fuel ratio feedback control to maintain the air fuel ratio at the stoichiometric level. In addition, active air fuel ratio control is performed for approximately 10 seconds after preconditions are met in order to measure the air fuel ratio sensor response rate. During active air fuel ratio control, the ECM forcibly increases and decreases the injection volume a certain amount, based on the stoichiometric air fuel ratio learned during normal air fuel ratio control, and measures the air fuel ratio sensor response rate. The ECM receives a signal from the air fuel ratio sensor while performing active air fuel ratio control and uses it to calculate the air fuel ratio sensor response rate deterioration level.

If the value for air fuel ratio sensor response rate deterioration level is less than the threshold, the ECM interprets this as a malfunction and sets the DTC.

Scheme 97

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

HINT

Performing this confirmation driving pattern will activate the A/F sensor response monitor.

Scheme 98

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
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 [A].
7. Enter the following menus: Powertrain / Engine / Monitor / O2 Sensor / Details.
8. Check that RES RATE B1S1 and RES RATE B2S1 are Fail.
9. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [B].
10. Drive the vehicle at a constant speed of between 47 and 62 mph (75 and 100 km/h) for 10 minutes [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
11. Check the monitor result values on the Techstream by entering the following menus: Powertrain / Engine / Monitor / O2 Sensor / Details / RES RATE B1S1 and RES RATE B2S1.
12. If the values indicated on the Techstream do not change, perform Readiness Monitor Drive Pattern for the air fuel ratio sensor and heated oxygen sensor. Refer to «READINESS MONITOR DRIVE PATTERN»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) .
13. Note the value of the RES RATE B1S1 and RES RATE B2S1.
14. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
15. Read the pending DTC [D]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
16. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
17. Input the DTC: P2A00 or P2A03.
18. 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 [C] again.
19. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
20. 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.
21. 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.

Refer to DTC P2195. Refer to WIRING DIAGRAM .

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 (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2) 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)

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

1. DTC P2A00 or P2A03 may be also set, when the air fuel ratio is stuck rich or lean.
2. A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
3. A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
4. 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 99

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03) 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 P2A00 and/or P2A03 are output A DTC P2A00 and/or P2A03 and other DTCs are output B HINT: If any DTCs other than P2A00 or P2A03 are output, troubleshoot those DTCs first. B --> See step 9 A: Go to next step
2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Disconnect the air fuel ratio sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Bank 1 Sensor 1) Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA1A) - 4 (A1A-) Always 10 kohms or higher Standard Resistance (Bank 2 Sensor 1) Tester Connection Condition Specified Condition 1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA2A) - 4 (A2A-) Always 10 kohms or higher Reconnect the air fuel ratio sensor connector. NG --> See step 10 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) Disconnect the air fuel ratio 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 E42-1 (HA1A) - E6-5 (HA1A) Always Below 1 ohms E42-3 (A1A+) - E5-23 (A1A+) Always Below 1 ohms E42-4 (A1A-) - E5-22 (A1A-) Always Below 1 ohms E38-1 (HA2A) - E6-6 (HA2A) Always Below 1 ohms E38-3 (A2A+) - E5-21 (A2A+) Always Below 1 ohms E38-4 (A2A-) - E5-20 (A2A-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E42-1 (HA1A) or E6-5 (HA1A) - Body ground Always 10 kohms or higher E42-3 (A1A+) or E5-23 (A1A+) - Body ground Always 10 kohms or higher E42-4 (A1A-) or E5-22 (A1A-) - Body ground Always 10 kohms or higher E38-1 (HA2A) or E6-6 (HA2A) - Body ground Always 10 kohms or higher E38-3 (A2A+) or E5-21 (A2A+) - Body ground Always 10 kohms or higher E38-4 (A2A-) or E5-20 (A2A-) - Body ground Always 10 kohms or higher Reconnect the air fuel ratio sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. PERFORM CONFIRMATION DRIVING PATTERN NEXT: Go to next step
5. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03) 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 / Pending. Read the DTCs. Result Result Proceed to DTC P2A00 and/or P2A03 are output A DTC is not output B B --> See step 11 A: Go to next step
6. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
7. PERFORM CONFIRMATION DRIVING PATTERN NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03) 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 / Pending. Read the DTCs. Result Result Proceed to DTC is not output A DTC P2A00 and/or P2A03 are output B B --> See step 12 A --> END
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. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
11. 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)
12. CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (REFER TO DTC P0171 PROCEDURE). 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)

The ECM (engine control unit) intercommunicates with the TCM (transmission control ECU) through the Controller Area Network (CAN).

If there is a problem in this intercommunication, the ECM sets a DTC.

Scheme 100

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: U0101.
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 [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 101

Scheme 102

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC U0101) 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 U0101 is output A DTC U0101 and other DTCs are output B HINT: If any DTCs other than U0101 are output, troubleshoot those DTCs first. B --> See step 7 A: Go to next step
2. INSPECT ECU POWER SOURCE CIRCUIT (TCM POWER SOURCE) Disconnect the TCM 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 A58-5 (+B) - Body ground Engine switch on (IG) 11 to 14 V Reconnect the TCM connector. NG --> See step 8 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (TCM - BODY GROUND) Disconnect the TCM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Condition Condition Specified Condition A58-2 (E1) - Body ground Always Below 1 ohms Reconnect the TCM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (TCM - BODY GROUND) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (ECM - TCM) Disconnect the ECM connector. Disconnect the TCM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition A6-10 (CAN+) - A58-21 (CAN+) Always Below 1 ohms A6-9 (CAN-) - A58-13 (CAN-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A6-10 (CAN+) or A58-21 (CAN+) - Body ground Always 10 kohms or higher A6-9 (CAN-) or A58-13 (CAN-) - Body ground Always 10 kohms or higher Reconnect the ECM connector and TCM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. 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
6. CHECK WHETHER DTC OUTPUT RECURS (DTC U0101) 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 is not output A DTC U0101 is output B B --> See step 9 A --> END
7. 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)
8. GO TO TCM POWER SOURCE CIRCUIT. Refer to «TCM Power Source Circuit»(/lexus/is-f/i-2007-2014/remont/automatic-trans/#automatic-transmission-diagnostic-codes-circuit-tests)
9. REPLACE TCM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/automatic-trans/#automatic-transmission-service-information)

RELATED DTCS

If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below.

Scheme 103

Note. If the reference pressure difference between the first and second checks is greater than the specification, all the DTCs relating to the reference pressure (P043E, P043F, P2401, P2402 and P2419) are stored.

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.

Scheme 104

Note. The canister is located near the fuel tank, underneath the body.

Scheme 105

Note. In this vehicle's EVAP system, turning ON the vent valve does not seal off the EVAP system. To check for leaks in the EVAP system, disconnect the air inlet vent hose and apply pressure from the atmosphere side of the canister.

While the engine is running, if a predetermined condition (closed loop etc.) is met, the purge VSV is opened by the ECM and stored fuel vapors in the canister are purged into the intake manifold. The ECM changes the duty cycle ratio of the purge VSV to control purge flow volume.

The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is allowed into the canister through the vent valve to ensure that the purge flow is maintained when the negative pressure (vacuum) is applied to the canister.

The following two monitors run to confirm appropriate EVAP system operation.

Scheme 106

Scheme 107

Scheme 108

1. Key-off monitor This monitor checks for EVAP (Evaporative Emission) system leaks and canister pump module malfunctions. The monitor starts 5 hours * after the engine switch is turned off. More than 5 hours are required for the fuel to cool down to stabilize the EVAP pressure, thus making the EVAP system monitor more accurate. The leak detection pump creates negative pressure (vacuum) in the EVAP system and the pressure is measured. Finally, the ECM monitors for leaks from the EVAP system, and malfunctions in both the canister pump module and purge VSV, 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.
2. Purge flow monitor The purge flow monitor consists of the two monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary. The 1st monitor While the engine is running and the purge VSV (Vacuum Switching Valve) 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. The 2nd monitor The vent valve is turned OFF (open) and the EVAP pressure is 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. Component Operation Canister Contains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank. Cut-off valve Located in fuel tank. Valve floats and closes when fuel tank 100% full. Purge VSV (Vacuum Switching Valve) Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In order to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge volume to intake manifold controlled by purge VSV duty cycle ratio (current-carrying time). (Open: ON, Closed: OFF) Refueling valve Controls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, spring and restrictor (diameter: 0.08 inch). When fuel vapor and pressure inside fuel tank increase, valve opens. While EVAP purged, valve closes and restrictor prevents large amount of vacuum from affecting pressure in fuel tank. Valve opened while refueling. Roll-over valve Located in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out. Soak timer Built into ECM. To ensure accurate EVAP monitor, measures 5 hours (+/-15 minutes) after engine switch turned off. This allows fuel to cool down, stabilizing EVAP pressure. When approximately 5 hours elapsed, ECM activates (Scheme 100) Canister pump module Consists of (a) to (d) below. Canister pump module cannot be disassembled. (a) Vent valve Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When, ECM turns valve OFF, EVAP system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing purge VSV, turning on vent valve (closed) and operating leak detection pump see scheme 62 (b) Canister pressure sensor Indicates pressure as voltages. ECM supplies regulated 5 V to canister pressure sensor, and uses feedback from sensor to monitor EVAP system pressure (Scheme 99) (c) Leak detection pump Creates negative pressure (vacuum) in EVAP system for leak check. (d) Reference orifice Has opening with 0.02 inch diameter. Vacuum produced through orifice by closing purge VSV, turning off vent valve and operating leak detection pump, to monitor reference pressure. Reference pressure indicates small leak of EVAP.

Scheme 109

Note. The Techstream is required to conduct the following diagnostic troubleshooting procedure.

HINT

1. Using the Techstream monitor results enables the EVAP (Evaporative Emission) system to be confirmed.
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 110

Scheme 111

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Scheme 113

Scheme 114

Scheme 115

Scheme 116

Scheme 117

Scheme 118

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

Scheme 125

Scheme 126

Scheme 127

Scheme 128

Scheme 129

1. CONFIRM DTC Turn the engine switch off and wait for 10 seconds. Turn the engine switch on (IG). Turn the engine switch off and wait for 10 seconds. 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. Confirm DTCs and freeze frame data. If any EVAP system DTCs are set, the malfunctioning area can be determined using the table below. NOTE: If the reference pressure difference between the first and second checks is greater than the specification, all the DTCs relating to the reference pressure (P043E, P043F, P2401, P2402 and P2419) are stored. NEXT: Go to next step
2. PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE) NOTE: The Evaporative System Check (Automatic Mode) consists of five 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 more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the temperature below 35°C (95°F). 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) . Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode. After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine / Trouble Codes. HINT: If no pending DTCs are displayed, perform the Monitor Confirmation (see "Diagnostic Help" menu). After this confirmation, check for pending DTCs. If no DTCs are displayed, the EVAP system is normal. NEXT: Go to next step
3. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE) NOTE: In the Evaporative System Check (Manual Mode), perform the series of 5 Evaporative System Check steps manually using the Techstream. 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 more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the temperature below 35°C (95°F). 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) . Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Manual Mode. NEXT: Go to next step
4. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 1/5) Check the EVAP pressure in step 1/5. Result DTC * Test Result Suspected Trouble Area Proceed to - Virtually no variation in EVAP pressure Not yet determined A P0451 EVAP pressure fluctuates by +/-0.3 kPa-g (2.25 mmHg-g) or more Canister pressure sensor noise B * : These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above. B --> See step 30 A: Go to next step
5. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 1/5 TO 2/5) Check the EVAP pressure in steps 1/5 and 2/5. Result DTC * Test Result Suspected Trouble Area Proceed to - Virtually no variation in EVAP pressure during step 1/5. Then decreases to reference pressure Not yet determined A P2402 Small difference between EVAP pressures during steps 1/5 and 2/5 Leak detection pump stuck ON B * : These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above. HINT: The first reference pressure is the value determined in step 2/5. B --> See step 23 A: Go to next step
6. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 2/5) HINT: Make a note of the pressures checked in steps (a) and (b) below. (a) Check the EVAP pressure 4 seconds after the leak detection pump is activated * . * : The leak detection pump begins to operate as step 1/5 finishes and step 2/5 starts. (b) Check the EVAP pressure again when it has stabilized. This pressure is the reference pressure. Result DTC * Test Result Suspected Trouble Area Proceed to - EVAP pressure in step (b) between -4.85 kPa-g and -1.057 kPa-g (-36.4 mmHg-g and -7.93 mmHg-g) Not yet determined A P043F and P2401 EVAP pressure in step (b) -1.057 kPa-g (-7.93 mmHg-g) or more Reference orifice high-flow Leak detection pump stuck OFF B P043E EVAP pressure in step (b) below -4.85 kPa-g (-36.4 mmHg-g) Reference orifice clogged C P2419 EVAP pressure in step (a) more than -1.057 kPa-g (-7.93 mmHg-g) Vent valve stuck closed D *: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above. D --> See step 19 C --> See step 30 B --> See step 11 A: Go to next step
7. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 2/5 TO 3/5) Check the EVAP pressure increase in step 3/5. Result DTC * Test Result Suspected Trouble Area Proceed to - EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 2/5 to step 3/5 Not yet determined A P2420 No variation in EVAP pressure despite proceeding from step 2/5 to step 3/5 Vent valve stuck open (vent) B P0451 No variation in EVAP pressure during steps 1/5 through 3/5 Canister pressure sensor malfunction fixed C * : These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above. C --> See step 30 B --> See step 20 A: Go to next step
8. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 3/5) Wait until the EVAP pressure change is less than 0.12 kPa-g (0.75 mmHg-g) for 40 seconds. Measure the EVAP pressure and record it. HINT: A few minutes are required for the EVAP pressure to become saturated. When there is little fuel in the fuel tank, it takes up to 15 minutes. NEXT: Go to next step
9. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 4/5) Check the EVAP pressure in step 4/5. Result DTC * Test Result Suspected Trouble Area Proceed to - EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 3/5 to step 4/5 Not yet determined A P0441 EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 3/5 to step 4/5 Problems in EVAP hose between purge VSV and intake manifold B P0441 Variation in EVAP pressure less than 0.3 kPa-g (2.25 mmHg-g) for 10 seconds, after proceeding from step 3/5 to step 4/5 Purge VSV stuck closed C * : These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above. C --> See step 12 B --> See step 15 A: Go to next step
10. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 5/5) Check the EVAP pressure in step 5/5. Compare the EVAP pressure in step 3/5 and the second reference pressure (step 5/5). Result DTC * Test Result Suspected Trouble Area Proceed to - EVAP pressure (step 3/5) lower than second reference pressure (step 5/5) Not yet determined (no leaks from EVAP system) A P0441 and P0455 EVAP pressure (step 3/5) higher than [second reference pressure (step 5/5) x 0.32] EVAP gross leak Purge VSV stuck open B P0456 EVAP pressure (step 3/5) higher than second reference pressure (step 5/5) EVAP small leak B * : These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above. B --> See step 12 A --> See step 36
11. PERFORM EVAPORATIVE SYSTEM CHECK (STEP 3/5) Check the EVAP pressure in step 3/5. Result DTC * Test Result Suspected Trouble Area Proceed to P043F EVAP pressure less than [reference pressure] measured at 2/5 Reference orifice high-flow A P2401 EVAP pressure almost same as [reference pressure] measured at 2/5 Leak detection pump stuck OFF B * : These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above. HINT: The first reference pressure is the value determined in step 2/5. B --> See step 23 A --> See step 30
12. PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV) Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for EVAP Control. Disconnect the hose (connected to the canister) from the purge VSV. Start the engine. Using the Techstream, turn off the purge VSV (Activate the VSV for EVAP Control: OFF). Use your finger to confirm that the purge VSV has no suction. Using the Techstream, turn on the purge VSV (Activate the VSV for EVAP Control: ON). Use your finger to confirm that the purge VSV has suction. Result Test Result Suspected Trouble Area Proceed to No suction when purge VSV turned OFF, and suction applied when turned ON Purge VSV normal A Suction applied when purge VSV turned OFF Purge VSV stuck open B No suction when purge VSV turned ON Purge VSV stuck closed Problems with EVAP hose between purge VSV and intake air surge tank C Reconnect the hose. C --> See step 15 B --> See step 14 A: Go to next step
13. CHECK FUEL CAP ASSEMBLY Check that the fuel cap is correctly installed and confirm the fuel cap meets OEM specifications. Confirm that the fuel cap is tightened until a few click sounds are heard. HINT: If an EVAP tester is available, check the fuel cap using the Techstream. Remove the fuel cap and install it onto a fuel cap adaptor. Connect an EVAP tester pump hose to the adaptor, and pressurize the cap to 3.2 to 3.7 kPa (24 to 28 mmHg) using an EVAP tester pump. Seal the adaptor and wait for 2 minutes. Check the pressure. If the pressure is 2 kPa (15 mmHg) or more, the fuel cap is normal. Result Test Result Suspected Trouble Area Proceed to Fuel cap correctly installed - A Fuel cap loose Fuel cap improperly installed Defective fuel cap Fuel cap does not meet OEM specifications B No fuel cap - C C --> See step 28 B --> See step 27 A --> See step 29
14. INSPECT PURGE VSV Turn the engine switch off. Disconnect the purge VSV connector. Disconnect the hose (connected to the canister) from the purge VSV. Start the engine. Use your finger to confirm that the purge VSV has no suction. Result Test Result Suspected Trouble Area Proceed to No suction ECM A Suction applied Purge VSV B Reconnect the Purge VSV connector. Reconnect the hose off. B --> See step 31 A --> See step 35
15. CHECK EVAP HOSE (PURGE VSV - INTAKE MANIFOLD) Turn the engine switch off. Disconnect the hose (connected to the intake manifold) from the purge VSV. Start the engine. Use your finger to confirm that the hose has suction. Result Test Result Suspected Trouble Area Proceed to Suction applied EVAP hose between purge VSV and intake manifold A No suction Intake air surge tank EVAP hose between purge VSV and intake manifold B Reconnect the hose. B --> See step 26 A: Go to next step
16. INSPECT PURGE VSV Remove the purge VSV. Apply the battery voltage to the terminals of the purge VSV. Using an air gun, confirm that air flows from port A to port B. Result Test Result Condition Suspected Trouble Area Proceed to Air flows Apply battery voltage to purge VSV terminals Purge VSV normal A No air flow Apply battery voltage to purge VSV terminals Purge VSV B Reinstall the purge VSV. B --> See step 31 A: Go to next step
17. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF PURGE VSV) Disconnect the purge VSV connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Result Tester Connection Switch Condition Test Result Suspected Trouble Area Proceed to E77-1 - Body ground Engine switch on (IG) 11 to 14 V Normal A Other than result above Wire harness or connectors between purge VSV and ECM B Reconnect the purge VSV connector. B --> See step 32 A: Go to next step
18. CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM) Disconnect the purge VSV 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 E77-1 - E3-17 (PRG) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E77-1 or E3-17 (PRG) - Body ground Always 10 kohms or higher Reconnect the VSV connector and ECM connector. NG --> See step 32 OK --> See step 35
19. PERFORM ACTIVE TEST USING TECHSTREAM (FOR VENT VALVE) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Active Test / Activate the VSV for Vent Valve. Measure the voltage according to the value(s) in the table below. Result Tester Connection Condition Test Result Suspected Trouble Area Proceed to E3-16 (VPMP) - Body ground Vent valve ON and OFF (Active test ON and OFF) 11 to 14 V when OFF Below 3 V when ON Vent valve A Below 3 V when OFF and ON ECM B B --> See step 35 A --> See step 22
20. PERFORM ACTIVE TEST USING TECHSTREAM (FOR VENT VALVE) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Active Test / Activate the VSV for Vent Valve. Measure the voltage according to the value(s) in the table below. Result Tester Connection Condition Test Result Suspected Trouble Area Proceed to E3-16 (VPMP) - Body ground Vent valve ON and OFF (Active test ON and OFF) Below 3 V when OFF and ON Power source of vent valve A 11 to 14 V when OFF Below 3 V when ON Vent valve B 11 to 14 V when OFF and ON ECM C C --> See step 35 B --> See step 22 A: Go to next step
21. INSPECT CANISTER PUMP MODULE (POWER SOURCE FOR VENT VALVE) Turn the engine switch off. Disconnect the canister pump module connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Result Tester Connection Switch Condition Test Result Suspected Trouble Area Proceed to Q49-9 (VLVB) - Body ground Engine switch on (IG) 11 to 14 V Normal A Below 3 V Power source wire harness of vent valve B Reconnect the canister pump module connector. B --> See step 32 A: Go to next step
22. INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION) Turn the engine switch off. Disconnect the canister pump module connector. Apply the battery voltage to VLVB and VGND terminals of the canister pump module. Touch the canister pump module to confirm the vent valve operation. Result Condition Test Result Suspected Trouble Area Proceed to Apply battery voltage to terminals VLVB and VGND Operating Wire harness between vent valve and ECM A Not operating Vent valve B Reconnect the canister pump module connector. B --> See step 30 A --> See step 32
23. PERFORM ACTIVE TEST USING TECHSTREAM (FOR LEAK DETECTION PUMP) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Active Test / Activate the Vacuum Pump. Measure the voltage according to the value(s) in the table below. Result Tester Connection Condition Test Result Suspected Trouble Area Proceed to E3-15 (MPMP) - Body ground Vacuum pump (leak detection pump) ON and OFF (Active test ON and OFF) Below 3 V when OFF 11 to 14 V when ON ECM normal A 11 to 14 V when OFF Below 3 V when ON ECM B B --> See step 35 A: Go to next step
24. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Connect the Techstream to the DLC3. Turn the engine switch off. Disconnect the canister pump module connector. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Active Test / Activate the Vacuum Pump. Turn the leak detection pump (vacuum pump) ON. Measure the voltage according to the value(s) in the table below. Result Tester Connection Condition Test Result Suspected Trouble Area Proceed to Q49-1 (MTRB) - Body ground Vacuum pump (leak detection pump) ON and OFF (Active test ON and OFF) 11 to 14 V Normal A Below 3 V Wire harness between ECM and leak detection pump B Reconnect the canister pump module connector. B --> See step 32 A: Go to next step
25. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - GROUND) Turn the engine switch off. Disconnect the canister pump module connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Test Result Suspected Trouble Area Proceed to Q49-6 (MGND) - Body ground Always Below 1 ohms Leak detection pump A 10 kohms or more Wire harness between leak detection pump and body ground B Reconnect the canister pump module connector. B --> See step 32 A --> See step 30
26. INSPECT INTAKE AIR SURGE TANK ASSEMBLY (EVAP PURGE PORT) Stop the engine. Disconnect the EVAP hose from the intake air surge tank assembly. Start the engine. Use your finger to confirm that the port of the intake air surge tank assembly has suction. Result Test Result Suspected Trouble Area Proceed to Suction applied EVAP hose between intake air surge tank assembly and purge VSV A No suction Intake air surge tank assembly B Reconnect the EVAP hose. B --> See step 34 A --> See step 33
27. CORRECTLY REINSTALL OR REPLACE FUEL CAP ASSEMBLY HINT: When reinstalling the fuel cap, tighten it until a few click sounds are heard. When replacing the fuel cap, use a fuel cap that meets OEM specifications, and install it until a few click sounds are heard. NEXT --> See step 37
28. REPLACE FUEL CAP ASSEMBLY HINT: When installing the fuel cap, tighten it until a few click sounds are heard. NEXT --> See step 37
29. LOCATE EVAP LEAK PART Disconnect the pressure gauge to the canister with the adapter. Connect the EVAP pressure tester tool to the canister with the adapter. Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28 mmHg). Apply soapy water to the piping and connecting parts of the EVAP system. Look for areas where bubbles appear. This indicates the leak point. Repair or replace the leak point. HINT: Disconnect the hose between the canister and the fuel tank from the canister. Block the canister side and conduct an inspection. In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks. Reconnect the vent hose. NEXT --> See step 37
30. 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 37
31. REPLACE PURGE VSV (PURGE VSV) Replace the purge VSV. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/auxiliary-emission-control-systems/#emission-control-service-information) . NEXT --> See step 37
32. REPAIR OR REPLACE HARNESS OR CONNECTOR NEXT --> See step 37
33. REPLACE EVAP HOSE (INTAKE AIR SURGE TANK - PURGE VSV) NEXT --> See step 37
34. INSPECT INTAKE AIR SURGE TANK ASSEMBLY Check that the EVAP purge port of the intake air surge tank assembly is not clogged. If necessary, replace the intake air surge tank assembly. NEXT --> See step 37
35. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT --> See step 37
36. REPAIR OR REPLACE PARTS AND COMPONENTS INDICATED BY OUTPUT DTCS Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was brought in. NEXT --> See step 37
37. PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE) NOTE: The Evaporative System Check (Automatic Mode) consists of five 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 more, a large amount of vapor forms and any check results become inaccurate. When performing an Evaporative System Check, keep the temperature below 35°C (95°F). 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 / Utility / Evaporative System Check / Automatic Mode. After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine / Trouble Codes. HINT: If no pending DTCs are found, the repair has been successfully completed. NEXT --> COMPLETED

HINT

After a repair, check the Monitor Status by performing the Key-Off Monitor Confirmation and Purge Flow Monitor Confirmation described below.

1. Key-off monitor confirmation Preconditions The monitor will not run unless: The vehicle has been driven for 10 minutes or more (in a city area or on a freeway) The fuel tank is less than 90% full The altitude is less than 8000 ft. (2400 m) The engine coolant temperature is between 4.4°C and 35°C (40°F and 95°F) The intake air temperature is between 4.4°C and 35°C (40°F and 95°F) The vehicle remains stationary (the vehicle speed is 0 mph [0 km/h]) Monitor Conditions Allow the engine to idle for at least 5 minutes. Turn the engine switch off and wait for 6 hours (8 or 10.5 hours). HINT: Do not start the engine until checking Monitor Status. If the engine is started, the steps described above must be repeated. Monitor Status Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Monitor / Evaporative System. Check the Monitor Status displayed on the Techstream. HINT: If Incomplete is displayed, the monitor is not completed. Make sure that the preconditions have been met, and perform the Monitor Conditions again.
2. Purge flow monitor confirmation (P0441) HINT: Perform this monitor confirmation after the Key-Off Monitor Confirmation shows Complete. Preconditions The monitor will not run unless: The vehicle has been driven for 10 minutes or more (in a city area or on a freeway) The engine coolant temperature is between 4.4°C and 35°C (40°F and 95°F) The intake air temperature is between 4.4°C and 35°C (40°F and 95°F) Monitor Conditions Release the pressure from the fuel tank by removing and reinstalling the fuel cap. Warm the engine up until the engine coolant temperature reaches more than 75°C (167°F). Increase the engine speed to 3000 rpm once. Allow the engine to idle and turn the air conditioning ON for 1 minute. Monitor Status Turn the engine switch off (if on (IG) or the engine is running). Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Monitor. Check the Monitor Status displayed on the Techstream. HINT: If Incomplete is displayed, the monitor is not completed. Make sure that the preconditions have been met, and perform the Monitor Conditions again.

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

The test value and test limit information are described in the following table. This information is included under Monitor Result in the emission-related DTC information

1. MID (Monitor Identification Data) is assigned to each emission-related component.
2. TID (Test Identification Data) is assigned to each test value.
3. Scaling is used to calculate the test value indicated on generic OBD II scan tools.

EVAP - KEY-OFF TYPE

* Pressures A to G are indicated in the diagram below.

Scheme 130

Scheme 131

When the engine switch is turned on (IG), the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI relay (EFI MAIN2) and supplying power to terminal +B and +B2 of the ECM.

If the engine switch is turned off, the ECM holds the EFI relay (EFI MAIN2) ON for a maximum of 2 seconds to allow for the initial setting of the throttle valve.

When the engine switch is turned on (IG), voltage from the ECM's MREL terminal is applied to the EFI relay (EFI MAIN2). This causes the contacts of the EFI relay (EFI MAIN2) to close, which supplies power to terminal +B and +B2 of the ECM.

Scheme 132

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Scheme 140

1. INSPECT ECM (+B, +B2 VOLTAGE) 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 A6-2 (+B) - E6-1 (E1) Engine switch on (IG) 11 to 14 V A6-1 (+B2) - E6-1 (E1) Engine switch on (IG) 11 to 14 V NG --> See step 2 OK --> See step 14
2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) 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 E6-1 (E1) - Body ground Always Below 1 ohms Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. INSPECT ECM (IGSW VOLTAGE) 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 A5-8 (IGSW) - E6-1 (E1) Engine switch on (IG) 11 to 14 V NG --> See step 9 OK: Go to next step
4. INSPECT ECM (MREL VOLTAGE) 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 A5-3 (MREL) - E6-1 (E1) Engine switch on (IG) 11 to 14 V NG --> See step 15 OK: Go to next step
5. 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 --> CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE (EFI FUSE) OK: Go to next step
6. INSPECT INTEGRATION NO. 1 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 2C-1 - 2A-8 When no battery voltage applied terminals 2A-6 and 2A-7 10 kohms or higher When battery voltage applied to terminals 2A-6 and 2A-7 Below 1 ohms Reinstall the integration relay. NG --> See step 16 OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (EFI MAIN RELAY - ECM AND BODY GROUND) Check the harness and the connectors between the integration relay and the 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 (Check for Open) Tester Connection Condition Specified Condition 2A-6 - A5-3 (MREL) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 2A-6 or A5-3 (MREL) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Check the harness and the connectors between the integration relay and body ground. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified condition 2A-7 - Body ground Always Below 1 ohms Reinstall the integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (EFI MAIN 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 2A-8 - A6-2 (+B) Always Below 1 ohms 2A-8 - A6-1 (+B2) Always Below 1 ohms Reinstall the integration relay. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - ECM) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INTEGRATION RELAY)
9. CHECK FUSE (IGN FUSE) Remove the 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 IGN fuse Always Below 1 ohms Reinstall the fuse. NG --> CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE OK: Go to next step
10. INSPECT IG2 RELAY Remove the IG2 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 3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 ohms Reinstall the relay. NG --> REPLACE IGNITION RELAY NO. 2 (IG2) OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (ECM - IG2 RELAY) Remove the IG2 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 IG2 relay (3) - A5-8 (IGSW) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition IG2 relay (3) or A5-8 (IGSW) Body ground Always 10 kohms or higher Reinstall the IG2 relay. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
12. CHECK FUSE (IG2 MAIN FUSE) Remove the IG2 MAIN fuse the engine room No. 1 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition IG2 MAIN fuse Always Below 1 ohms Reinstall the IG2 MAIN fuse. NG --> CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE (IG2 MAIN FUSE) OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (IG2 RELAY POWER SOURCE CIRCUIT) Remove the IG2 relay from the engine room No. 2 relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition IG2 relay (5) - Body ground Always 11 to 14 V Reinstall the IG2 relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BATTERY) OK --> See step 17
14. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__problem-symptoms-table)
15. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
16. REPLACE INTEGRATION NO. 1 RELAY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
17. GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/lexus/is-f/i-2007-2014/remont/starter/#smart-access-system-keyless-start-diagnostics-introduction__how-to-proceed-with-troubleshooting)

The ECM constantly uses 5 V from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.

Scheme 141

When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.

HINT

Under normal conditions, the MIL is illuminated for several seconds when the engine switch is first turned on (IG). The MIL goes off when the engine is started.

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1. CHECK MIL Check that Malfunction Indicator Lamp (MIL) illuminates when turning the engine switch on (IG). OK MIL illuminates. NG --> See step 2 OK --> SYSTEM OK
2. CHECK CONNECTION BETWEEN TECHSTREAM AND ECM Connect the Techstream to the DLC3. Turn the engine switch on (IG) and Techstream on. Check the communication between the Techstream and ECM. Result Result Proceed to Communication is possible A Communication is not possible B A --> See step 14 B: Go to next step
3. CHECK MIL (THROTTLE BODY ASSEMBLY) Disconnect the throttle body assembly connector. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the throttle body assembly connector. A --> See step 15 B: Go to next step
4. CHECK MIL (ACCELERATOR PEDAL POSITION SENSOR) Disconnect the accelerator pedal position sensor connector. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the accelerator pedal position sensor connector. A --> See step 16 B: Go to next step
5. CHECK MIL (CANISTER PUMP MODULE) Disconnect the canister pump module connector. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the canister pump module connector. A --> See step 17 B: Go to next step
6. CHECK MIL (CRANKSHAFT POSITION SENSOR) Disconnect the crankshaft position sensor. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the crankshaft position sensor. A --> See step 18 B: Go to next step
7. CHECK MIL (CAMSHAFT POSITION SENSOR) Disconnect the camshaft position sensor. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the camshaft position sensor. A --> See step 19 B: Go to next step
8. CHECK MIL (VVT SENSOR FOR INTAKE SIDE BANK 1) Disconnect the VVT sensor for intake side bank 1 connector. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the VVT sensor for intake side bank 1 connector. A --> See step 20 B: Go to next step
9. CHECK MIL (VVT SENSOR FOR EXHAUST SIDE BANK 1) Disconnect the VVT sensor for exhaust side bank 1 connector. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the VVT sensor for exhaust side bank 1 connector. A --> See step 21 B: Go to next step
10. CHECK MIL (VVT SENSOR FOR INTAKE SIDE BANK 2) Disconnect the VVT sensor for intake side bank 2 connector. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the VVT sensor for intake side bank 2 connector. A --> See step 22 B: Go to next step
11. CHECK MIL (VVT SENSOR FOR EXHAUST SIDE BANK 2) Disconnect the VVT sensor for exhaust side bank 2 connector. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the VVT sensor for exhaust side bank 2 connector. A --> See step 23 B: Go to next step
12. CHECK MIL (FUEL PRESSURE SENSOR) Remove the intake manifold. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/exhaust/#exhaust-service-information__removal) . Disconnect the fuel pressure sensor connector. Turn the engine switch on (IG). Check the MIL. Result Result Proceed to MIL illuminates A MIL does not illuminate B Reconnect the fuel pressure sensor connector. Reinstall the intake manifold. Refer to «INSTALLATION»(/lexus/is-f/i-2007-2014/remont/exhaust/#exhaust-service-information) . A --> See step 24 B: Go to next step
13. CHECK HARNESS AND CONNECTOR Disconnect the throttle body assembly connector. Disconnect the accelerator pedal position sensor connector. Disconnect the canister pump module connector. Disconnect the VVT sensor for intake side (bank 1). Disconnect the VVT sensor for exhaust side (bank 1). Disconnect the VVT sensor for intake side (bank 2). Disconnect the VVT sensor for exhaust side (bank 2). Disconnect the crankshaft position sensor. Disconnect the camshaft position sensor. Disconnect the fuel pressure sensor. Disconnect the E3, E4 and A5 ECM connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E4-34 (VCTA) - Body ground Always 10 kohms or higher A5-23 (VCPA) - Body ground Always 10 kohms or higher A5-22 (VCP2) - Body ground Always 10 kohms or higher E3-18 (VC) - Body ground Always 10 kohms or higher Reconnect the ECM connectors. Reconnect the canister pump module connector. Reconnect the accelerator pedal position sensor connector. Reconnect the throttle body assembly connector. Reconnect the VVT sensor for intake side (bank 1). Reconnect the VVT sensor for exhaust side (bank 1). Reconnect the VVT sensor for intake side (bank 2). Reconnect the VVT sensor for exhaust side (bank 2). Reconnect the crankshaft position sensor. Reconnect the camshaft position sensor. Reconnect the fuel pressure sensor. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 25
14. GO TO MIL CIRCUIT. Refer to «MIL Circuit»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p1604-u0101-circuit-tests)
15. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
16. REPLACE ACCELERATOR PEDAL ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
17. REPLACE CANISTER ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/auxiliary-emission-control-systems/#emission-control-service-information)
18. REPLACE CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
19. REPLACE CAMSHAFT POSITION SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
20. REPLACE VVT SENSOR FOR INTAKE SIDE BANK 1. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
21. REPLACE VVT SENSOR FOR EXHAUST SIDE BANK 1. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
22. REPLACE VVT SENSOR FOR INTAKE SIDE BANK 2. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
23. REPLACE VVT SENSOR FOR EXHAUST SIDE BANK 2. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
24. REPLACE FUEL PRESSURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
25. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

Refer to DTC P0230. Refer to DESCRIPTION .

Refer to DTC P0230. Refer to WIRING DIAGRAM .

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1. 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 5 OK: Go to next step
2. 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 voltage applied to terminals 1 and 2 Below 1 ohms 3 - 4 When battery voltage applied to terminals 1 and 2 10 kohms or higher Reinstall the F/PMP relay. NG --> REPLACE F/PMP RELAY OK: Go to next step
3. INSPECT FUEL PUMP RESISTOR Disconnect the fuel pump resister connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 0.30 to 0.34 ohms Reconnect the fuel pump resister connector. NG --> See step 15 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (F/PMP RELAY - FUEL PUMP RESISTOR) Remove the F/PMP relay from the engine room No. 2 relay block. Disconnect the fuel pump resistor 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 (4) - Fuel pump resistor (A40-2) Always Below 1 ohms F/PMP relay (3) - Fuel pump resistor (A40-1) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition Fuel pump relay (4) or Fuel pump resistor (A40-2) - Body ground Always 10 kohms or higher Fuel pump relay (3) or Fuel pump resistor (A40-1) - Body ground Always 10 kohms or higher Reinstall the F/PMP relay. Reconnect the fuel pump resister connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 16
5. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CIRCUIT OPENING RELAY) Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test /Activate the Fuel Pump Speed Control. Check the operation of the relay while operating it using the Techstream. OK Operating noise can be heard from the relay. NG --> See step 11 OK: Go to next step
6. INSPECT FUEL PUMP Inspect fuel pump resistance. Remove the fuel pump. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 4 - 5 20°C (68°F) 0.2 to 3.0 ohms Inspect fuel pump operation. Apply battery voltage to both terminals. Check that the pump operates. NOTE: These tests must be done quickly (within 10 seconds) to prevent the coil from burning out. Keep the fuel pump as far away from the battery as possible. Always turn the voltage on and off on the battery side, not the fuel pump side. Reinstall the fuel pump. NG --> See step 17 OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (FUEL PUMP - F/PMP RELAY AND BODY GROUND) Check the harness and the connectors between the fuel pump and the F/PMP relay. Disconnect the fuel pump connector. 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 (Check for Open) Tester Connection Condition Specified Condition Fuel pump (Q14-4) - F/PMP relay (4) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition Fuel pump (Q14-4) or F/PMP (4) - Body ground Always 10 kohms or higher Reinstall the F/PMP relay. Check the harness and the connectors between the fuel pump and body ground. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition Fuel pump (Q14-5) - Body ground Always 10 kohms or higher Reconnect the fuel pump connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - F/PMP RELAY) Remove the integration relay from the engine room No. 2 relay block. 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 (Check for Open) Tester Connection Condition Specified Condition Integration relay (2B-8) - F/PMP relay (1) Always Below 1 ohms Integration relay (2B-8) - F/PMP relay (3) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition Circuit opening relay (2B-8) or F/PMP relay (1) - Body ground Always 10 kohms or higher Circuit opening relay (2B-8) or F/PMP relay (3) - Body ground Always 10 kohms or higher Reinstall the relays. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND) Disconnect the fuel pump connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition Fuel pump (Q14-5) - Body ground Always Below 1 ohms Reconnect the fuel pump connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
10. CHECK FUEL LINE Check the fuel lines for leaks or blockage. OK No leaks or blockage NG --> REPAIR OR REPLACE FUEL LINE OK --> REPAIR OR REPLACE FUEL SYSTEM (PRESSURE REGULATOR AND FUEL FILTER)
11. INSPECT FUSE (F/PMP FUSE) Remove the F/PMP 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 F/PMP fuse Always Below 1 ohms Reinstall the F/PMP fuse. NG --> CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE (F/PMP FUSE) OK: Go to next step
12. INSPECT INTEGRATION NO. 1 RELAY (EFI NO. 2 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 2B-4 - 2C-1 When no battery voltage applied to terminals 2B-3 and 2B-2 10 kohms or higher 2B-4 - 2C-1 When battery voltage applied to terminals 2B-3 and 2B-2 Below 1 ohms Reinstall the integration relay. NG --> See step 18 OK: Go to next step
13. INSPECT INTEGRATION NO. 1 RELAY (C/OPN 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 2B-6 - 2B-8 When no battery voltage applied to terminals 2B-6 and 2B-7 10 kohms or higher 2B-6 - 2B-8 When battery voltage applied to terminals 2B-6 and 2B-7 Below 1 ohms Reinstall the integration relay. NG --> See step 18 OK: Go to next step
14. INSPECT ECM (FC VOLTAGE) 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 A5-5 (FC) - E6-1 (E1) Engine Switch on (IG) 11 to 14 V NG --> CHECK AND REPAIR HARNESS AND CONNECTOR (ECM - C/OPN RELAY) OK --> See step 19
15. REPLACE FUEL PUMP RESISTOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
16. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__problem-symptoms-table)
17. REPLACE FUEL PUMP. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
18. REPLACE INTEGRATION NO. 1 RELAY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
19. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The cranking holding control system provides current to the starter when the ECM detects the engine switch's start signal (STSW). When the ECM performs a firing judgment, the system cuts current to the starter. When the ECM receives the STSW signal, it turns on the ST CUT relay, which prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to the ECM's STAR terminal. Then the STAR output signal travels through the park/neutral position (PNP) switch to the STARTER relay, causing the starter to activate.

When the engine is cranking, the starter operation signal is sent to the ECM's STA terminal.

Scheme 151

Refer to DTC P0617. Refer to WIRING DIAGRAM .

Scheme 152

Scheme 153

Scheme 154

Scheme 155

Scheme 156

Scheme 157

1. READ VALUE USING TECHSTREAM (STA 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 result when the engine switch is turned on (IG) and the engine is started. Standard Condition Techstream Display Engine switch on (IG) Close (Starter signal OFF) Engine started Open (Starter signal ON) NG --> See step 9 OK: Go to next step
2. INSPECT STARTER RELAY Remove the STARTER relay from the engine room No. 1 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 3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 ohms Reinstall the STARTER relay. NG --> REPLACE STARTER RELAY OK: Go to next step
3. INSPECT FUSIBLE LINK BLOCK ASSEMBLY (STARTER FUSE) Remove the fusible link block assembly from the engine room No. 1 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1B-1 - 1G-4 Always Below 1 ohms Reinstall the fusible link block assembly. NG --> REPLACE FUSIBLE LINK BLOCK ASSEMBLY (STARTER FUSE) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - STARTER RELAY) Disconnect the park/neutral position switch connector. Remove the STARTER relay from the engine room No. 1 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition Park/Neutral position switch (E45-5) - STARTER relay (1) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition Park/Neutral position switch (E45-5) or STARTER relay (1) - Body ground Always 10 kohms or higher Reconnect the park/neutral position switch connector. Reinstall the STARTER relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (STARTER RELAY - BODY GROUND) Remove the STARTER relay from the engine room No. 1 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition STARTER relay (2) - Body ground Always Below 1 ohms Reinstall the STARTER relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - BODY GROUND) OK: Go to next step
6. INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE) Remove the STARTER relay from the engine room No. 1 relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition STARTER relay (5) - Body ground Always 11 to 14 V Reinstall the STARTER relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - BATTERY) OK: Go to next step
7. INSPECT STARTER ASSEMBLY Inspect the starter assembly. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/starter/#starting-service-information) . NG --> REPAIR OR REPLACE STARTER ASSEMBLY OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (STARTER RELAY - STARTER ASSEMBLY) Remove the STARTER relay from the engine room No. 1 relay block. Disconnect the starter connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition STARTER relay (3) - E10-1 Always Below 1 ohms Reinstall the STARTER relay. Reconnect the starter connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - STARTER ASSEMBLY) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER - BATTERY)
9. INSPECT ECM (STAR AND STSW VOLTAGE) Measure the voltage according to the value(s) in the table below while cranking the engine. Standard Voltage Tester Connection Condition Specified Condition A5-2 (STAR) - E6-1 (E1) Cranking 11 to 14 V A5-27 (STSW) - E6-1 (E1) Cranking 11 to 14 V Result Terminal STAR Terminal STSW Proceed to 11 to 14 V 11 to 14 V A 0 V 11 to 14 V B 0 V 0 V C C --> See step 17 B --> See step 18 A: Go to next step
10. INSPECT ST CUT RELAY Remove the ST CUT 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 3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 ohms Reinstall the ST CUT relay. NG --> REPLACE ST CUT RELAY OK: Go to next step
11. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Disconnect the park/neutral position switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Shift 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 19 OK: Go to next step
12. CHECK HARNESS AND CONNECTOR (ST CUT RELAY POWER SOURCE) Remove the ST CUT 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 ST CUT relay (2) - Body ground Engine switch on (IG) 11 to 14 V Reinstall the ST CUT relay. NG --> See step 16 OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - BODY GROUND) Remove the ST CUT 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 ST CUT relay (1) - Body ground Always Below 1 ohms Reinstall the ST CUT relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
14. CHECK HARNESS AND CONNECTOR (ECM - ST CUT RELAY) Disconnect the ECM connector. Remove the ST CUT 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 A5-2 (STAR) - ST CUT relay (3) Always Below 1 ohms Reinstall the ST CUT relay. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
15. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST CUT RELAY) Disconnect the park/neutral position switch connector. Remove the ST CUT relay from the engine room No. 2 relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition Park/Neutral position switch (E45-4) - ST CUT relay (5) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition Park/Neutral position switch (E45-4) or ST CUT relay (5) - Body ground Always 10 kohms or higher Reconnect the park/neutral position switch connector. Reinstall the ST CUT relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ST CUT RELAY - PARK/NEUTRAL POSITION SWITCH) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)
16. CHECK HARNESS AND CONNECTOR (ST CUT RELAY - POWER SOURCE CONTROL ECU) Remove the ST CUT relay from the engine room No. 2 relay block. Disconnect the power source control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition ST CUT relay (2) - J55-35 (IG2D) Always Below 1 ohms Reinstall the ST CUT relay. Reconnect the power source control ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 20
17. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ECM) Check the harness and the connectors between the power source control ECU and ECM. Disconnect the power source control ECU 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 J55-39 (STSW) - A5-27 (STSW) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition J55-39 (STSW) or A5-27 (STSW) - Body ground Always 10 kohms or higher Reconnect the ECM connector and power source control ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 21
18. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
19. REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/automatic-trans/#automatic-transmission-service-information)
20. GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/lexus/is-f/i-2007-2014/remont/starter/#smart-access-system-keyless-start-diagnostics-introduction__how-to-proceed-with-troubleshooting)
21. GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/lexus/is-f/i-2007-2014/remont/starter/#smart-access-system-keyless-start-diagnostics-introduction__how-to-proceed-with-troubleshooting)

The air cleaner is equipped with two inlets, one of which is opened or closed by the Air Intake Control Valve (AICV). This system reduces intake noise and increases engine power at low-to-high engine speed range.

When the engine is operating in the low-to-mid speed range, this control operates the AICV to close one of the air cleaner inlets. When the engine speed is more than 3600 rpm the ECM turns off the VSV to open the AICV.

Scheme 158

Scheme 159

Scheme 160

1. CHECK VACUUM SWITCHING VALVE (VSV FOR AIR INTAKE CONTROL VALVE) Inspect the VSV for air intake control valve. Refer to «ON-VEHICLE INSPECTION - Step 3»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . NG --> REPLACE VSV (FOR AIR INTAKE CONTROL VALVE) OK: Go to next step
2. INSPECT TERMINAL VOLTAGE (VSV FOR AIR INTAKE CONTROL VALVE CONNECTOR) Disconnect the VSV for air intake control valve 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 2 - Body ground Engine switch on (IG) 11 to 14 V Reconnect the VSV connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 2 FUSE - VSV FOR AIR INTAKE CONTROL VALVE) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (VSV FOR AIR INTAKE CONTROL VALVE - ECM) Disconnect the VSV for air intake control valve 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 A60-1 (VSV for AICV) - E3-8 (AICV) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A60-1 (VSV for AICV) or E3-8 (AICV) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the VSV connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR AIR INTAKE CONTROL VALVE - ECM) OK: Go to next step
4. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
5. INSPECT AIR INTAKE CONTROL VALVE Inspect the intake air control valve. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . NG --> REPLACE AIR CLEANER CASE OK --> See step 4

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM. By turning the engine switch on (IG), power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.

The MIL operation can be checked visually

When the engine switch is first turned on (IG), the MIL should be illuminated and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure.

If the ECM detects trouble, the MIL illuminates. At this time, the ECM records a DTC in the memory.

Scheme 161

1. CHECK THAT MIL IS ILLUMINATED Turn the engine switch on (IG). Check the illumination of the MIL. Result Result Proceed to MIL remains illuminated (Even after engine switch on (IG) and several seconds have passed, MIL still remains illuminated) A MIL remains off (Does not illuminate at all) B MIL illuminates for several seconds, but turns off after engine is started C C --> SYSTEM OK B --> See step 5 A: Go to next step
2. CHECK IF MIL TURNS OFF Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Check if DTCs have been stored. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . If DTCs are present, write them down. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Check that the MIL turns off. OK MIL turns off. NG --> See step 3 OK --> See step 8
3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the ECM connector. Turn the engine switch on (IG). Check that the MIL is not illuminated. OK MIL is not illuminated. Reconnect the ECM connector. NG --> See step 4 OK --> See step 9
4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - 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 J35-12 (EFI) or A5-11 (W) - Body ground Always 10 kohms or higher Reconnect the combination meter connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 10
5. CHECK THAT ENGINE STARTS Start the engine. Result Result Proceed to Engine starts A Engine does not start* B HINT: *: The tester cannot communicate with the ECM. B --> See step 11 A: Go to next step
6. CHECK HARNESS AND CONNECTOR (ECM TERMINAL VOLTAGE) Disconnect the ECM 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 A5-11 (W) - Body ground Engine switch on (IG) 11 to 14 V Reconnect the ECM connector. NG --> See step 7 OK --> See step 12
7. CHECK HARNESS AND CONNECTOR (COMBINATION METER - 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 J35-12 (EFI) - A5-11 (W) Always Below 1 ohms Reconnect the combination meter connector and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 13
8. REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)
9. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
10. REPAIR OR REPLACE COMBINATION METER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/gauges-instrument-panels/#meter-gauge-display-service-information)
11. GO TO VC OUTPUT CIRCUIT. Refer to «VC Output Circuit»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p1604-u0101-circuit-tests)
12. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
13. REPLACE COMBINATION METER ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/gauges-instrument-panels/#meter-gauge-display-service-information)

See also:
• FREEZE FRAME DATA
• REMOVAL
• ON-VEHICLE INSPECTION - Step 2
• INSPECTION
• ON-VEHICLE INSPECTION - Step 1
• REMOVAL
• ON-VEHICLE INSPECTION
• DTC CHECK / CLEAR
• ON-VEHICLE INSPECTION - Step 9
• DIAGNOSTIC TROUBLE CODE CHART
• HOW TO PROCEED WITH TROUBLESHOOTING
• REMOVAL
• DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0337: Crankshaft Position Sensor "A" Circuit Low Input; DTC P0338: Crankshaft Position Sensor "A" Circuit High Input; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent
• INSPECTION
• PROCEDURE - Step 3
• CHECK FOR INTERMITTENT PROBLEMS
• CHECKING MONITOR STATUS
• TCM Power Source Circuit
• REMOVAL
• PROBLEM SYMPTOMS TABLE
• HOW TO PROCEED WITH TROUBLESHOOTING
• REMOVAL
• INSTALLATION
• REMOVAL
• Cranking Holding Function Circuit
• WIRING DIAGRAM