Engine Control (diagnostic Codes (p0010-p0193) Lexus IS F I

DESCRIPTION

The electric VVT changes the valve timing using a motor. In comparison to a conventional hydraulic VVT, the valve timing range is greater and the VVT operates even when the engine speed is low or the engine is cold. As a result, it is possible to increase engine output and mileage.

The camshaft timing control motor is equipped with a self diagnostic function, which is used to output diagnosis signals (VTM) to the ECM.

Scheme 365

SYMPTOMS AND FAIL-SAFE OPERATION DURING CAMSHAFT CONTROL MOTOR MALFUNCTION

MONITOR DESCRIPTION

This DTC is output when an IC overheat malfunction or an overcurrent malfunction is detected in the intake side camshaft timing control motor. The camshaft timing control motor is equipped with a self diagnostic function, which is used to output diagnosis signals (VTM) to the ECM. If the ECM receives a motor driver interior malfunction signal, a DTC is output immediately (1 trip detection logic). If the engine is idled for 10 seconds, a DTC is detected.

Scheme 366

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

Scheme 367

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more [B].
7. Idle the engine for 10 seconds [C].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [D]. 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: P0010 or P0020.
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 [C] 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.

INSPECTION PROCEDURE

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 368

1. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (BANK 1 OR BANK 2) Turn the engine switch off. Remove the camshaft timing control motor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check if the camshaft timing gear assembly eccentric shaft rotates smoothly. OK Rotates smoothly Reinstall the camshaft timing control motor. NG --> See step 2 OK --> See step 3
2. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (BANK 1 AND/OR BANK 2). Refer to «DISASSEMBLY - Step 37»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
3. REPLACE CAM TIMING CONTROL WITH EDU MOTOR ASSEMBLY (BANK 1 AND/OR BANK 2). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

Refer to DTC P0010. Refer to DESCRIPTION .

SYMPTOMS AND FAIL-SAFE OPERATION DURING CAMSHAFT CONTROL MOTOR MALFUNCTION

This DTC is output when a valve timing stuck condition is detected. When the valve timing is in the advance angle position, if the valve timing does not vary, and there is a large difference in the target and actual valve timing, it is determined that a malfunction has occurred. When this malfunction is detected, a DTC is output immediately (1 trip detection logic). After the engine is warmed up, if the vehicle is idled for 5 minutes, a DTC is output.

MONITOR RESULT

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

Scheme 369

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more [B].
7. Idle the engine for 5 minutes or more [C].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC [D]. 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: P0011 or P0021.
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 steps [E] through [G].
13. Drive the vehicle for 2 to 3 minutes [E].
14. Idle the engine for 5 minutes or more [F].
15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
16. Input the DTC: P0011 or P0021.
17. Check the DTC judgment result [G]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. The Techstream only: By using the Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2) Active Test, it can be determined if the VVT-iE system is malfunctioning. Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2). 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 --> 20 deg --> 40 deg --> 10 deg --> 0 deg --> 10 deg --> END Within 5 DegFR
2. When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011 OR P0021) 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 P0011 or P0021 is output A DTC P0011 or P0021 and other DTCs are output B HINT: If any DTCs other than P0011 or P0021 are output, troubleshoot those DTCs first. B --> See step 4 A: Go to next step
2. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (BANK 1 AND/OR BANK 2) Replace the camshaft timing gear assembly for bank 1 and/or bank 2. Refer to «DISASSEMBLY - Step 37»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NEXT: Go to next step
3. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 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 driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A Other DTCs output B B --> See step 5 A --> END
4. 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)
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)

Refer to DTC P0010. Refer to DESCRIPTION .

SYMPTOMS AND FAIL-SAFE OPERATION DURING CAMSHAFT CONTROL MOTOR MALFUNCTION

This DTC is output when a valve timing stuck condition is detected. With the engine speed at 4000 rpm or less in the retard angle position, if the valve timing does not vary, and there is a large difference in the target and actual valve timing, it is determined that a malfunction has occurred. If this condition is detected while driving, a DTC is output (2 trip detection logic).

After the engine is warmed up, a DTC is output if the following occurs: 1) the vehicle is driven in an urban area for 5 minutes, and then the engine switch is turned off; and 2) the engine is started and the vehicle is driven in an urban area for 5 minutes.

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

Scheme 370

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more [B].
7. Drive the vehicle for 5 minutes or more [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
8. Idle the engine for 30 seconds or more [D].
9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
10. Read the pending DTC [E]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P0012 or P0022.
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's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [F] through [H].
14. Drive the vehicle for 5 minutes or more [F]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
15. Idle the engine for 30 seconds or more [G].
16. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
17. Input the DTC: P0012 or P0022.
18. Check the DTC judgment result [H]. HINT: If the judgment result shows ABNORMAL, the system has malfunction. If the judgment result shows NORMAL, the system is normal.
19. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. The Techstream only: By using the Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2) Active Test, it can be determined if the VVT-iE system is malfunctioning. Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2). 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 --> 20 deg --> 40 deg --> 10 deg --> 0 deg --> 10 deg --> END Within 5 DegFR
2. When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0012 OR P0022) 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 P0012 or P0022 is output A DTC P0012 or P0022 and other DTCs are output B HINT: If any DTCs other than P0012 or P0022 are output, troubleshoot those DTCs first. B --> See step 5 A: Go to next step
2. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (BANK 1 AND/OR BANK 2) Remove the camshaft timing control motor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check if the camshaft timing gear assembly eccentric shaft rotates smoothly. OK Rotates smoothly Reinstall the camshaft timing control motor. NG --> See step 6 OK: Go to next step
3. REPLACE CAMSHAFT TIMING CONTROL MOTOR (BANK 1 AND/OR BANK 2) Replace the camshaft timing control motor for bank 1 and/or bank 2. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
4. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 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. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Drive the vehicle in an urban area for approximately 5 minutes. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending. Read the pending DTCs. Result Result Proceed to Pending DTC is not output A Other pending DTCs output B B --> See step 7 A --> 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 CAMSHAFT TIMING GEAR ASSEMBLY (BANK 1 AND/OR BANK 2). Refer to «DISASSEMBLY - Step 37»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
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)

This DTC is designed to detect an open or short in the camshaft oil control valve circuit. If the oil control valve duty-cycle is excessively high or low while the engine is running, the ECM will illuminate the MIL and set the DTC.

The Variable Valve Timing (VVT) system adjusts the exhaust valve timing to improve driveability. The engine oil pressure turns the camshaft actuator to adjust the valve timing. The oil control valve is a solenoid valve and switches the engine oil line. The valve moves when the ECM applies the 12 V to the solenoid. The ECM changes the energizing time to the solenoid (duty-cycle) in accordance with the camshaft position, crankshaft position, throttle position, etc.

Scheme 371

This DTC is designed to detect an open or short in the camshaft oil control valve circuit. If the oil control valve duty-cycle is excessively high or low while the engine is running, the ECM will illuminate the MIL and set the DTC.

COMPONENT OPERATING RANGE

Scheme 372

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on.
6. Wait 5 seconds [A].
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: P0013 or P0023.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 373

HINT

1. If DTC P0013 is displayed, check the bank 1 VVT system for exhaust side circuit.
2. Bank 1 refers to the bank that includes the No. 1 cylinder.
3. If DTC P0023 is displayed, check the bank 2 VVT system for exhaust side circuit.
4. Bank 2 refers to the bank that does not include the No. 1 cylinder.
5. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 374

Scheme 375

1. CHECK DTC (DTC P0013 OR P0023) Connect the Techstream to the DLC3. Clear DTCs after recording the freeze frame data and DTCs. Turn the engine switch off. Allow the engine to idle and check for DTCs. Check if P0013 or P0023 is present. Result Result Proceed to P0013 A P0023 B B --> See step 3 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (OIL CONTROL VALVE FOR EXHAUST SIDE OPERATION) Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Warm up the engine. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT Exhaust Linear (Bank1). Check the engine speed while operating the oil control valve using the Techstream. OK Tester Operation Engine Condition 0% Normal engine speed 100% Engine idles roughly NG --> See step 4 OK --> See step 6
3. PERFORM ACTIVE TEST USING TECHSTREAM (OIL CONTROL VALVE FOR EXHAUST SIDE OPERATION) Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Warm up the engine. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT Exhaust Linear (Bank2). Check the engine speed while operating the oil control valve using the Techstream. OK Tester Operation Engine Condition 0% Normal engine speed 100% Engine idles roughly NG --> See step 4 OK --> See step 6
4. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Remove the oil control valve assembly for bank 1 and/or bank 2. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . 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) 6.9 to 7.9 ohms Connect a lead from the positive battery terminal to terminal 1, and a lead from the negative battery terminal to terminal 2. Check the valve operation. OK Valve moves quickly. Reinstall the oil control valve. NG --> See step 7 OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (OIL CONTROL VALVE - ECM) Disconnect the oil 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 E31-1 - E4-4 (OE1+) Always Below 1 ohms E31-2 - E4-3 (OE1-) Always Below 1 ohms E21-1 - E5-18 (OE2+) Always Below 1 ohms E21-2 - E5-28 (OE2-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E31-1 or E4-4 (OE1+) - Body ground Always 10 kohms or higher E31-2 or E4-3 (OE1-) - Body ground Always 10 kohms or higher E21-1 or E5-18 (OE2+) - Body ground Always 10 kohms or higher E21-2 or E5-28 (OE2-) - Body ground Always 10 kohms or higher Reconnect the oil control valve and ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
7. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (BANK 1 AND/OR BANK 2). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

Refer to DTC P0013. Refer to DESCRIPTION .

The ECM optimizes the exhaust valve timing using the VVT (Variable Valve Timing) system to control the exhaust camshaft. The VVT system includes the ECM, the camshaft timing oil control valve and the VVT controller.

The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve. This control signal regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the exhaust camshaft.

If the difference between the target and actual exhaust valve timing is large, and changes in actual exhaust valve timing are small, the ECM interprets this as the VVT controller stuck malfunction and sets a DTC.

DTCs P0014 and P0024 (Advanced Cam Timing) are subject to 2 trip detection logic.

DTCs P0015 and P0025 (Retarded Cam Timing) are subject to 1 trip detection logic.

These DTCs indicate that the VVT controller cannot operate properly due to camshaft timing oil control valve malfunctions or the presence of foreign objects in the camshaft timing oil control valve.

ADVANCED CAMSHAFT TIMING

RETARDED CAMSHAFT TIMING

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

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Drive the vehicle for 5 minutes or more [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
8. Idle the engine for 30 seconds or more [D].
9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
10. Read the pending DTC [E]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P0014, P0015, P0024 or P0025.
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 NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [F] through [H].
14. Drive the vehicle for 5 minutes or more [F]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
15. Idle the engine for 30 seconds or more [G].
16. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
17. Input the DTC: P0014, P0015, P0024 or P0025.
18. Check the DTC judgment result [H]. HINT: If the judgment result shows ABNORMAL, the system has malfunction. If the judgment result shows NORMAL, the system is normal.
19. 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.

WIRING DIAGRAM

Refer to DTC P0013. Refer to WIRING DIAGRAM .

HINT

1. If DTC P0014 or P0015 is displayed, check the bank 1 VVT system for exhaust side circuit.
2. Bank 1 refers to the bank that includes the No. 1 cylinder.
3. If DTC P0024 or P0025 is displayed, check the bank 2 VVT system for exhaust side circuit.
4. Bank 2 refers to the bank that does not include the No. 1 cylinder.
5. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0014, P0015, P0024 OR P0025) 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 P0014, P0015, P0024 or P0025 is output A DTC P0014, P0015, P0024 or P0025 and other DTCs are output B HINT: If any DTCs other than P0014, P0015, P0024 or P0025 are output, troubleshoot those DTCs first. B --> See step 9 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (OIL CONTROL VALVE FOR EXHAUST SIDE OPERATION) Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Warm up the engine. 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 Tester Operation Engine Condition 0% Normal engine speed 100% Engine idles roughly NG --> See step 4 OK: Go to next step
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0014, P0015, P0024 OR P0025) 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) . 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. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P0014, P0015, P0024 or P0025. Check the DTC judgment result. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0014, P0015, P0024 or P0025 is output) B B --> See step 4 A --> See step 10
4. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (FOR EXHAUST SIDE) Remove the camshaft timing oil control valve assembly for bank 1 and/or bank 2. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . 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) 6.9 to 7.9 ohms Connect a lead from the positive battery terminal to terminal 1, and a lead from the negative battery terminal to terminal 2. Check the valve operation. OK Valve moves quickly. Reinstall the camshaft timing oil control valve assembly. NG --> See step 11 OK: Go to next step
5. INSPECT OIL CONTROL VALVE FILTER (BANK 1 AND/OR BANK 2) Remove the cylinder head cover sub-assembly. Refer to «DISASSEMBLY - Step 20»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . Remove the camshaft timing oil control valve filter. Refer to «DISASSEMBLY - Step 23»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . Inspect the camshaft timing oil control valve filter. OK Filter is not clogged. Reinstall the camshaft timing oil control valve filter. Refer to «REASSEMBLY - Step 47»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . Reinstall the cylinder head cover sub-assembly. Refer to «REASSEMBLY - Step 49»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> See step 12 OK: Go to next step
6. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN) See step 3 NG --> See step 13 OK: Go to next step
7. REPLACE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY (BANK 1 AND/OR BANK 2) Replace the camshaft timing exhaust gear assembly for bank 1 and/or bank 2. Refer to «DISASSEMBLY - Step 37»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NEXT: Go to next step
8. 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) . 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. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P0014, P0015, P0024 or P0025. Check the DTC judgment result. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0014, P0015, P0024 or P0025 is output) B HINT: DTC P0014, P0015, P0024 or P0025 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil, thus eliminating the source of the problem. B --> See step 14 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. 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)
11. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (BANK 1 AND/OR BANK 2). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
12. REPLACE OIL CONTROL VALVE FILTER. Refer to «DISASSEMBLY - Step 23»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
13. ADJUST VALVE TIMING. Refer to «REASSEMBLY - Step 24»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
14. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

Refer to DTC P0010. Refer to DESCRIPTION .

These DTCs are output when a valve timing deviation condition is detected. While the vehicle is being driven or the engine is idling (after the battery terminals are reconnected), if a valve timing deviation is detected during the valve timing initialization operation, it is determined that a malfunction has occurred. If this condition is detected while driving, a DTC is output (2 trip detection logic). However, if the valve timing is deviated, the camshaft position sensor malfunction DTC P1340 may be output.

A DTC is output if the following occurs: 1) the engine is idled, and then the engine switch is turned off; and 2) the engine is started and the engine is idled.

DTC P0016 and/or P0018 may be output if the battery is reconnected and the engine is started while the following are disconnected from the camshaft timing control motor: 1) power source harness or connector; or 2) ECM harness or connector.

If P0016 and/or P0018 is output, check if the harness or connector is disconnected.

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

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Idle the engine for 5 minutes or more [C].
8. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
9. 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.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0016 or P0018.
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 steps [E] through [G].
13. Drive the vehicle for 2 to 3 minutes [E]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
14. Idle the engine for 5 minutes or more [F].
15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
16. Input the DTC: P0016 or P0018.
17. Check the DTC judgment result [G]. HINT: If the judgment result shows ABNORMAL, the system has malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. The Techstream only: By using the Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2) Active Test, it can be determined if the VVT-iE system is malfunctioning. Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2) 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 --> 20 deg --> 40 deg --> 10 deg --> 0 deg --> 10 deg --> END Within 5 DegFR
2. When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 376

1. CHECK ANY OTHER DTCS OUTPUT (P0016 OR P0018) 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 / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0016 or P0018 is output A DTC P0016 or P0018 and other DTCs are output B HINT: If any DTCs other than P0016 or P0018 are output, troubleshoot those DTCs first. B --> See step 5 A: Go to next step
2. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (BANK 1 AND/OR BANK 2) Remove the camshaft timing control motor (bank 1 and/or bank 2). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Check if the camshaft timing gear assembly eccentric shaft rotates smoothly. OK Rotates smoothly Reinstall the camshaft timing control motor. NG --> See step 6 OK: Go to next step
3. INSPECT VALVE TIMING Remove the bank 1 and bank 2 cylinder head covers. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration. OK The timing marks on the camshaft timing gears are aligned as shown in the illustration. Reinstall the cylinder head covers. NG --> See step 7 OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS To initialize the ECM valve timing, disconnect the cable from the negative (-) battery terminal for 1 minute. Connect the cable to the negative (-) battery terminal. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Connect the Techstream to the DLC3. Start the engine. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending. Read the pending DTCs. Result Result Proceed to DTC is not output A Other DTCs output B B --> See step 8 A --> 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 CAMSHAFT TIMING GEAR ASSEMBLY (BANK 1 AND/OR BANK 2). Refer to «DISASSEMBLY - Step 37»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
7. ADJUST VALVE TIMING. Refer to «REASSEMBLY - Step 24»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
8. 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)

Refer to DTC P0013. Refer to DESCRIPTION .

These DTCs are output when a valve timing deviation condition is detected. While the vehicle is being driven or the engine is idling (after the battery terminals are reconnected), if a valve timing deviation is detected during the valve timing initialization operation, it is determined that a malfunction has occurred. If this condition is detected while driving, a DTC is output (2 trip detection logic). However, if the valve timing is deviated, the camshaft position sensor malfunction DTC P1340 may be output.

A DTC is output if the following occurs: 1) the engine is idled, and then the engine switch is turned off; and 2) the engine is started and the engine is idled.

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

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Idle the engine for 5 minutes or more [C].
8. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
9. 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.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0017 or P0019.
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 steps [E] through [G].
13. Drive the vehicle for 2 to 3 minutes [E] WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
14. Idle the engine for 5 minutes or more [F]
15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
16. Input the DTC: P0017 or P0019.
17. Check the DTC judgment result [G]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0017 OR P0019) 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 P0017 or P0019 is output A DTC P0017 or P0019 and other DTCs are output B HINT: If any DTCs other than P0017 or P0019 are output, troubleshoot those DTCs first. B --> See step 9 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT EXHAUST LINEAR) HINT: If the VVT system can be operated through the Active Test, it can be determined that there is no problem in the VVT system. Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine and warm it up. Run the engine at idle. 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 Tester Operation Engine Condition 0% Normal engine speed 30% Engine idles roughly Result Result Proceed to NG A OK B B --> See step 4 A: Go to next step
3. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (BANK 1 AND/OR BANK 2) See step 4 NG --> See step 7 OK: Go to next step
4. CHECK VALVE TIMING See step 3 NG --> See step 8 OK: Go to next step
5. REPLACE CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY (BANK 1 AND/OR BANK 2) Replace the camshaft timing exhaust gear assembly. Refer to «DISASSEMBLY - Step 37»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information) . NEXT: Go to next step
6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED To initialize the ECM valve timing, disconnect the cable from the negative (-) battery terminal for 1 minute. Connect the cable to the negative (-) battery terminal. Refer to «PRECAUTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction) . Connect the Techstream to the DLC3. Start the engine. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending. Read the pending DTCs. Result Result Proceed to DTC is not output A Other DTCs output B B --> See step 9 A --> END
7. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (BANK 1 AND/OR BANK 2). Refer to «DISASSEMBLY - Step 37»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
8. ADJUST VALVE TIMING. Refer to «REASSEMBLY - Step 29»(/lexus/is-f/i-2007-2014/remont/mechanical/#engine-mechanical-service-information)
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)

HINT

1. Although the DTC titles include oxygen sensor, these DTCs relate to the Air Fuel Ratio (A/F) 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 generates 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 though 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 to a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.

Scheme 377

HINT

Scheme 378

1. When any of these DTCs are set, the ECM enters fail safe mode. The ECM turns off the air fuel ratio sensor heater in fail safe mode. Fail-safe mode continues until the engine switch is turned off.
2. The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The air fuel ratio sensor heater circuit uses a relay on the +B side of the circuit.

HINT

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

1. The ECM uses information from the air fuel ratio sensor to regulate the air fuel ratio and keep it close to the stoichiometric level. This maximizes the ability of the three way catalytic converter to purify the exhaust gases.
2. The air fuel ratio sensor detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner surface of the sensor element is exposed to the outside air. The outer surface of the sensor element is exposed to the exhaust gas. The sensor element is made of platinum coated zirconia and includes an integrated heating element.
3. The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations between the exhaust gas and outside air. The platinum coating amplifies this voltage generation.
4. The air fuel ratio sensor is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot generate useful voltage signals without supplementary heating. The ECM regulates the supplementary heating using a duty-cycle approach to adjust the average current in the sensor heater element. If the heater current is outside the normal range, the signal transmitted by the air fuel ratio sensor will be inaccurate, as a result, the ECM will be unable to regulate air fuel ratio properly.
5. When the current in the air fuel ratio sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and sets a DTC.

ALL

P0031 AND P0051

P0032 AND P0052

P0031 AND P0051

P0032 AND P0052

P0031 AND P0051

Scheme 379

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 idle it for 5 minutes or more [B].
7. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].
8. Idle the engine for 5 minutes or more [D].
9. Enter the following menus: Powertrain / Engine / Trouble Codes.
10. Read the DTC [E]. 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: P0031, P0032, P0051 or P0052.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform steps [B] through [D] again.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Check the DTC judgment result.
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.

Refer to DTC P2195. 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 380

Scheme 381

Scheme 382

Scheme 383

Scheme 384

1. 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
2. CHECK TERMINAL VOLTAGE (+B OF AIR FUEL RATIO SENSOR) 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 (Bank 1 Sensor 1) Tester Connection Switch Condition Specified Condition E42-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V Standard Voltage (Bank 2 Sensor 1) Tester Connection Switch Condition Specified Condition E38-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V Reconnect the air fuel ratio sensor connector. NG --> See step 4 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 E38-1 (HA2A) - E6-6 (HA2A) Always Below 1 ohms E6-4 (E04) - Body ground Always Below 1 ohms A5-1 (E05) - Body ground 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 E38-1 (HA2A) or E6-6 (HA2A) - 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 (AIR FUEL RATIO SENSOR - ECM) OK --> See step 11
4. CHECK HARNESS AND CONNECTOR (A/F RELAY - AIR FUEL RATIO SENSOR) Disconnect the air fuel ratio sensor connector. Remove the A/F 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 E42-2 - A/F relay (3) Always Below 1 ohms E38-2 - A/F relay (3) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E42-2 or A/F relay (3) - Body ground Always 10 kohms or higher E38-2 or A/F relay (3) - Body ground Always 10 kohms or higher Reinstall the A/F relay. Reconnect the air fuel ratio sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - A/F RELAY) OK: Go to next step
5. INSPECT A/F RELAY Remove the A/F 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 Switch 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 A/F relay. NG --> REPLACE A/F RELAY OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (A/F RELAY - BODY GROUND) Remove the A/F relay from the engine room No. 2 relay block. Measure the resistance according to the valve(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A/F relay (2) - Body ground Always Below 1 ohms Reinstall the A/F relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (A/F RELAY - BODY GROUND) OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (A/F RELAY POWER SOURCE) Remove the A/F 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 A/F relay (5) - Body ground Always 11 to 14 V Reinstall the A/F relay. NG --> See step 9 OK: Go to next step
8. INSPECT FUSE (EFI NO. 2 FUSE) Remove the EFI No. 2 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 No. 2 fuse Always Below 1 ohms Reinstall the fuse. NG --> REPLACE FUSE (EFI NO. 2 FUSE) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (A/F RELAY - INTEGRATION RELAY)
9. INSPECT A/F FUSE Remove the A/F 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 A/F fuse Always Below 1 ohms Reinstall the A/F fuse. NG --> REPLACE FUSE (A/F FUSE) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (A/F RELAY - BATTERY)
10. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
11. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

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 air fuel level. For the purpose of helping the ECM to deliver accurate air fuel ratio control, a Heated Oxygen (HO2) sensor is used.

The heated oxygen sensor is located behind the three way catalytic converter, and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low).

When the air fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The heated oxygen sensor informs the ECM that the post three way catalytic converter air fuel ratio is lean (low voltage, i.e. less than 0.45 V).

Conversely, when the air fuel ratio is richer than the stoichiometric air fuel level, the oxygen concentration in the exhaust gas becomes lean. The heated oxygen sensor informs the ECM that the post three way catalytic converter air fuel ratio is rich (high voltage, i.e. more than 0.45 V). The heated oxygen sensor has the property of changing its output voltage drastically when the air fuel ratio is close to the stoichiometric level.

The ECM uses the supplementary information from the heated oxygen sensor to determine whether the air fuel ratio after the three way catalytic converter is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the heated oxygen sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air fuel ratio control.

Scheme 385

HINT

Scheme 386

1. Sensor 2 refers to the sensor mounted behind the three way catalytic converter and located far from the engine assembly.
2. When any of these DTCs are set, the ECM enters fail safe mode. The ECM turns off the heated oxygen sensor heater in fail safe mode. Fail safe mode continues until the engine switch is turned off.
3. The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The heated oxygen sensor heater circuit uses a relay on the +B side of the circuit.

HINT

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

The sensing portion of the heated oxygen sensor has a zirconia element which is used to detect the oxygen concentration in the exhaust gas. If the zirconia element is at the appropriate temperature, and the difference between the oxygen concentrations surrounding the inside and outside surfaces of the sensor is large, the zirconia element generates voltage signals. In order to increase the oxygen concentration detecting capacity of the zirconia element, the ECM supplements the heat from the exhaust with heat from a heating element inside the sensor.

Heated oxygen sensor heater range check (P0037, P0038, P0057 and P0058)

1. The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions. If the current is below the threshold value, the ECM will determine that there is an open circuit in the heater. If the current is above the threshold value, the ECM will determine that there is a short circuit in the heater.

Heated oxygen sensor heater performance (P0141 and P0161)

1. After the accumulated heater ON time exceeds 100 seconds, the ECM calculates the heater resistance using the battery voltage and the current applied to the heater. If the resistance is above the threshold value, the ECM will determine that there is a malfunction in the heated oxygen sensor heater and set DTC P0141 and P0161.

ALL

P0037 AND P0057

P0038 AND P0058 (CASE 1)

P0038 AND P0058 (CASE 2)

P0141 AND P0161

P0037 AND P0057

P0038 AND P0058

P0141 AND P0161 (HEATER PERFORMANCE MONITOR CHECK)

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 idle it for 5 minutes or more [B].
7. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 3000 rpm for 1 minute [C].
8. Idle the engine for 5 minutes or more [D].
9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
10. Read the pending DTC [E]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P0037, P0038, P0057, P0058, P0141 or P0161.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform steps [B] through [D] again.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
16. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0136. 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 387

Scheme 388

1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the heated oxygen sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Bank 1 Sensor 2) Tester Connection Condition Specified Condition 1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT1B) - 4 (E2) Always 10 kohms or higher Standard Resistance (Bank 2 Sensor 2) Tester Connection Condition Specified Condition 1 (HT2B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT2B) - 4 (E2) Always 10 kohms or higher Reconnect the heated oxygen sensor connector. NG --> See step 5 OK: Go to next step
2. CHECK TERMINAL VOLTAGE (+B OF HEATED OXYGEN SENSOR) Disconnect the heated oxygen sensor connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage (Bank 1 Sensor 2) Tester Connection Switch Condition Specified Condition J94-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V Standard Voltage (Bank 2 Sensor 2) Tester Connection Switch Condition Specified Condition J95-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V Reconnect the heated oxygen sensor connector. NG --> See step 4 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the heated oxygen sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Terminal Connection Condition Specified Condition J94-1 (HT1B) - A6-4 (HT1B) Always Below 1 ohms J95-1 (HT2B) - A6-3 (HT2B) Always Below 1 ohms Standard Resistance (Check for Short) Terminal Connection Condition Specified Condition J94-1 (HT1B) or A6-4 (HT1B) - Body ground Always 10 kohms or higher J95-1 (HT2B) or A6-3 (HT2B) - Body ground Always 10 kohms or higher Reconnect the heated oxygen sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM) OK --> See step 6
4. INSPECT FUSE (EFI NO. 2 FUSE) Remove the EFI No. 2 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 No. 2 fuse Always Below 1 ohms Reinstall the fuse. NG --> REPLACE FUSE (EFI NO. 2 FUSE) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - HEATED OXYGEN SENSOR)
5. REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The direct injection high-pressure fuel system has a spill control valve, pump plunger and check valve. The spill control valve adjusts the discharge amount of the high-pressure fuel, the pump plunger operated by the camshaft pressurizes the fuel, the check valve mechanically opens and closes the line to the fuel delivery pipe. The fuel pump for high pressure is installed to the cylinder head cover (bank 1 and bank 2) and is driven by the cam lobe located at the rear end of each intake camshaft. When the plunger moves up and down due to camshaft rotation, it pressurizes the fuel. The pressurized fuel then pushes open the check valve, and the fuel flows to the fuel delivery pipe. The ECM controls the spill control valve to adjust the fuel pressure to 4 to 13 MPa (41 to 133 kgf/cm 2 ). The ECM receives signals from the fuel pressure sensor, monitors the fuel pressure, and maintains the target fuel pressure. If the fuel pressure of the fuel delivery pipe exceeds 15.3 MPa (156 kgf/cm 2 ), the fuel relief valve opens and returns the fuel to the fuel tank.

Scheme 389

If the fuel pressure decreases even after the ECM commands the high-pressure fuel pump to close the spill control valve, a DTC is output.

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Record the Freeze Frame Data.
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. Based on engine rpm, engine load and other freeze frame data stored in the ECM, reproduce the conditions present when the DTC was stored.
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC. 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: P0087.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
13. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

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

1. CHECK FUEL LEAK (HIGH PRESSURE SIDE) Check around and beneath the car for gasoline leaks, fumes, etc. OK No gasoline leaks present. NG --> REPAIR OR REPLACE FUEL LEAK POINT OK: Go to next step
2. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0087) 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 P0087 is output A DTC P0087 and other DTCs are output B HINT: If any DTCs other than P0087 are output, troubleshoot those DTCs first. B --> See step 9 A: Go to next step
3. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . NG --> See step 14 OK: Go to next step
4. CHECK MISFIRE COUNT Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. Allow the engine to idle. Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire count to Cylinder #8 Misfire count. If no misfire counts occur for any of the cylinders, perform the following procedure: Move the shift lever to D. Monitor all of the misfire rate values that are displayed on the Techstream. Result Misfire Count Proceed to No misfire counts, or misfire counts occur randomly in all cylinders A Misfire counts occur in a particular cylinder B B --> See step 10 A: Go to next step
5. INSPECT FUEL RELIEF VALVE Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. Record the Fuel Press value. Turn the engine switch off. Wait for 10 seconds. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the Techstream. Result Inspection Result Proceed to Fuel Press value is maintained A Fuel Press value drops B B --> See step 11 A: Go to next step
6. INSPECT INJECTOR DRIVER (NO. 1 AND NO. 2) Replace the No. 1 and No. 2 injector drivers with known good ones from another vehicle. NOTE: Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged. Connect the Techstream to the DLC3. Start the engine. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Perform the driving test. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0087 is output A DTC is not output B B --> See step 12 A: Go to next step
7. REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE OF BANK 1 AND BANK 2) HINT: Replace the fuel pump assembly for high pressure. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information) . NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Clear DTCs. Start the engine. Perform the driving test. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0087 is output A DTC is not output B B --> END A --> See step 13
9. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)
10. REPLACE FUEL INJECTOR FOR DIRECT INJECTION. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
11. REPLACE FUEL RELIEF VALVE. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
12. REPLACE INJECTOR DRIVER (NO. 1 AND NO. 2). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
13. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
14. CHECK FUEL PUMP OPERATION Check the fuel pump operation. Refer to «ON-VEHICLE INSPECTION - Step 1»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . NG --> See step 15 OK --> CHECK AND REPLACE FUEL SYSTEM (PRESSURE REGULATOR, PIPE LINE AND FILTER)
15. REPLACE FUEL PUMP (LOW PRESSURE SIDE). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)

Refer to DTC P0087. Refer to DESCRIPTION .

If the fuel pressure does not decrease even after the ECM commands the high-pressure fuel pump to open the spill control valve, a DTC is output.

If there is minimal difference between the fuel pressure before and after the fuel relief valve operates, a DTC is output.

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Record the Freeze Frame Data.
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. Based on engine speed, engine load and other freeze frame data stored in the ECM, reproduce the conditions present when the DTC was stored.
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read the DTC. 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: P0088.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
13. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

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

1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0088) 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 P0088 is output A DTC P0088 and other DTCs are output B HINT: If any DTCs other than P0088 are output, troubleshoot those DTCs first. B --> See step 8 A: Go to next step
2. READ VALUE USING TECHSTREAM (FREEZE FRAME DATA) 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 freeze frame data. Result Display (DTC output) Proceed to Output while driving A Output while idling B B --> See step 6 A: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (CHECK FUEL PUMP FOR HIGH PRESSURE) Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Target Fuel Press / Fuel Press. Check that the fuel pressure fluctuates when the target fuel pressure changes. HINT: The Active Test operation lowers the target fuel pressure by 12.5% or increase the target fuel pressure by 25%. OK Fuel pressure fluctuates. NG --> See step 6 OK: Go to next step
4. REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE (BANK 2)) Replace the fuel pump assembly (for high pressure). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information) . NEXT: Go to next step
5. CHECK IF DTC OUTPUT RECURS (SEE IF DTC P0088 IS OUTPUT AGAIN) Connect the Techstream to the DLC3. Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Start the engine. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0088 is output A DTC is not output B B --> END A --> See step 9
6. REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE (BANK 1)) Replace the fuel pump assembly (for high pressure). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information) . NEXT: Go to next step
7. CHECK IF DTC OUTPUT RECURS (SEE IF DTC P0088 IS OUTPUT AGAIN) Connect the Techstream to the DLC3. Turn the Techstream on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Start the engine. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0088 is output A DTC is not output B B --> END A --> See step 10
8. 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)
9. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
10. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

Refer to DTC P0102. Refer to DESCRIPTION .

The mass air flow meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and to provide an appropriate air fuel ratio. Inside the mass air flow meter, there is a heated platinum wire which is exposed to the flow of intake air. By applying a specific electrical current to the wire, the ECM heats it to a specific temperature. The flow of incoming air cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components of the mass air flow meter. The voltage level is proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume.

The ECM monitors the average engine load value ratio to check the mass air flow meter for malfunctions. The average engine load value ratio is obtained by comparing the average engine load calculated from the mass air flow meter output to the average engine load estimated from the driving conditions, such as the engine speed and the throttle opening angle. If the average engine load value ratio is below the threshold value, the ECM determines that the intake air volume is low, and if the average engine load value ratio is above the threshold value, the ECM determines that the intake air volume is high.

If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.

Scheme 390

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 70°C (158°F) or higher [A].
8. Drive the vehicle at approximately 50 mph (80 km/h) to 70 mph (112 km/h) for 5 minutes or more [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: Drive while keeping the engine load as stable as possible.
9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
10. Read the pending DTC [C]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P0101.
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 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 P0102. 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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101) 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 P0101 is output A DTC P0101 and other DTCs are output B HINT: If any DTCs other than P0101 are output, troubleshoot those DTCs first. B --> See step 4 A: Go to next step
2. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. OK No leaks from intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
3. CHECK PCV HOSE CONNECTIONS OK PCV hose is connected correctly and is not damaged. NG --> See step 5 OK --> See step 6
4. 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)
5. REPLACE PCV HOSE. Refer to «REMOVAL - Step 3»(/lexus/is-f/i-2007-2014/remont/auxiliary-emission-control-systems/#emission-control-service-information)
6. REPLACE MASS AIR FLOW METER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The mass air flow meter is a sensor that measures the amount of air flowing through the throttle valve.

The ECM uses this information to determine the fuel injection time and to provide appropriate air fuel ratio.

Inside the mass air flow meter, there is a heated platinum wire which is exposed to the flow of intake air.

By applying a specific electrical current to the wire, the ECM heats it to a given temperature. The flow of incoming air cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the mass air flow meter. The voltage level is proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume.

The circuit is constructed so that the platinum hot wire and the temperature sensor provide a bridge circuit, and the power transistor is controlled so that the potentials of A and B remain equal to maintain the predetermined temperature.

HINT

When any of these DTCs are set, the ECM enters fail safe mode. During fail safe mode, the ignition timing is calculated by the ECM, according to the engine speed and throttle valve position. Fail safe mode continues until a pass condition is detected.

Scheme 391

HINT

When any of these DTCs are set, check the air-flow rate by entering the following menus: Powertrain / Engine / Data List / MAF.

If there is a defect in the mass air flow meter or an open or short circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the mass air flow meter and sets a DTC.

Example

When the sensor output voltage remains less than 0.2 V, or more than 4.9 V, for more than 3 seconds, the ECM sets a DTC.

If the malfunction is not repaired successfully, a DTC is set 3 seconds after the engine is next started.

P0102

P0103

Scheme 392

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 5 seconds [B].
8. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
9. Read the pending DTC [C]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0102 or P0103.
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 [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 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 393

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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 394

Scheme 395

Scheme 396

1. READ DTC OUTPUT Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0102 is output A DTC P0103 is output B B --> See step 5 A: Go to next step
2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) Disconnect the mass air flow meter 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 E29-3 (+B) - Body ground Engine switch on (IG) 11 to 14 V Reconnect the mass air flow meter connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER - EFI MAIN RELAY) OK: Go to next step
3. 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 Reconnect the mass air flow meter connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT MASS AIR FLOW METER Perform On-vehicle Inspection. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Perform Inspection. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . Inspect the function of the mass air flow meter. Remove the mass air flow meter with the connector connected. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / MAF. Blow air to the mass air flow meter and check that the intake air amount reading changes. OK The reading changes. NG --> See step 8 OK --> See step 7
5. INSPECT MASS AIR FLOW METER (SENSOR GROUND) Disconnect the mass air flow meter connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E29-4 (E2G) - Body ground Always 10 kohms or higher Reconnect the mass air flow meter connector. NG --> See step 6 OK --> See step 8
6. 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 E29-4 (E2G) - E3-24 (E2G) Always Below 1 ohms Reconnect the mass air flow meter connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 7
7. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
8. REPLACE MASS AIR FLOW METER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

Scheme 397

1. The intake air temperature sensor, in the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (Scheme 397)
2. The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.
3. Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes, according to changes in the intake air temperature, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.

The ECM performs OBD II monitoring based on the values from the intake air temperature sensor. If there is no change of the sensor value within the normal range, the ECM will not be able to perform OBD II monitoring or will misdiagnose that there is a malfunction in the sensor. The ECM detects the stuck intake air temperature sensor value by performing monitoring after the engine switch is turned off or after the engine is started.

ALL

AFTER ENGINE STOP

AFTER COLD ENGINE START

AFTER ENGINE STOP

AFTER COLD ENGINE START

Scheme 398

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Idle the engine for 5 minutes or more [C]. HINT: During steps [A] through [C], if the change in the intake air temperature is below 1°C (1.8°F), the intake air temperature sensor (mass air flow meter) is malfunctioning. It is not necessary to continue this procedure.
8. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
9. 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.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0111.
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 steps [E] and [F].
13. Drive the vehicle at 25 mph (40 km/h) or more for a total of 5 minutes or more [E]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
15. Check the DTC judgment result [F]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
16. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0112. 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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0111) 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 P0111 and other DTCs are output A DTC P0111 is output B HINT: If any DTCs other than P0111 are output, troubleshoot those DTCs first. B --> See step 3 A --> See step 2
2. 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)
3. REPLACE MASS AIR FLOW METER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

1. The intake air temperature sensor, in the mass air flow meter, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes see scheme 44
2. The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.
3. Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes, according to changes in the intake air temperature, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability. HINT: When any of DTCs P0112 and P0113 are set, the ECM enters fail safe mode. During fail safe mode, the intake air temperature is estimated to be 20°C (68°F) by the ECM. Fail safe mode continues until a pass condition is detected.

HINT

When any of these DTCs are set, check the intake air temperature by entering the following menus: Powertrain / Engine / Data List / Intake Air.

The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the intake air temperature sensor and sets a DTC.

Example

If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the intake air temperature sensor circuit, and sets DTC P0113. Conversely, if the output voltage is less than 0.18 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0112.

If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.

P0112

P0113

Scheme 399

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 0.5 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: P0112 or P0113.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 400

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

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.

Scheme 401

Scheme 402

Scheme 403

Scheme 404

1. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Intake Air. Read the value displayed on the Techstream. Standard Same as actual intake air temperature. Result Temperature Displayed Proceed to -40 °C (-40°F) A 140°C (284°F) B Same as actual intake air temperature C HINT: If there is an open circuit, the Techstream indicates -40°C (-40°F). If there is a short circuit, the Techstream indicates 140°C (284°F). C --> See step 6 B --> See step 4 A: Go to next step
2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) Disconnect the mass air flow meter connector. Connect terminals THA and E2 of the mass air flow meter wire harness connector. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Intake Air. Read the value displayed on the Techstream. Standard 140°C (284°F) Reconnect the mass air flow meter connector. NG --> See step 3 OK --> See step 7
3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM) Disconnect the mass air flow meter connector. Connect terminals THA and E2 of the ECM connector. HINT: Before checking, do visual and contact pressure checks on the ECM connector. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Intake Air. Read the value displayed on the Techstream. Standard 140°C (284°F) Reconnect the mass air flow meter connector. NG --> See step 8 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR
4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the mass air flow meter connector. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Intake Air. Read the value displayed on the Techstream. Standard -40°C (-40°F) Reconnect the mass air flow meter connector. NG --> See step 5 OK --> See step 9
5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN ECM) Disconnect the mass air flow meter connector. Disconnect the ECM connector. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Intake Air. Read the value displayed on the Techstream. Standard -40°C (-40°F) Reconnect the mass air flow meter connector. NG --> See step 10 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
7. REPLACE MASS AIR FLOW METER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
9. REPLACE MASS AIR FLOW METER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
10. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor.

The structure of the sensor and its connection to the ECM is similar to the intake air temperature sensor.

HINT

When any of DTCs P0115, P0117 and P0118 are set, the ECM enters fail safe mode. During fail safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail safe mode continues until a pass condition is detected.

HINT

When any of these DTCs are set, check the engine coolant temperature by entering the following menus: Powertrain / Engine / Data List / Coolant Temp.

1. The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the engine coolant temperature sensor and sets a DTC. Example: If the sensor output voltage is more than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the engine coolant temperature sensor circuit, and sets DTC P0118. Conversely, if the voltage output is less than 0.14 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and sets DTC P0117. If the malfunction is not repaired successfully, a DTC is set 0.5 seconds after the engine is next started.

P0115

P0117

P0118

Scheme 405

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 0.5 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: P0115, P0117 or P0118.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [A] again.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
14. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 406

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
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 407

Scheme 408

Scheme 409

Scheme 410

1. READ VALUE USING TECHSTREAM (COOLANT TEMP) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the value displayed on the Techstream. Standard Same as actual engine coolant temperature. Result Temperature Displayed Proceed to -40°C (-40°F) A 140°C (284°F) or more B Same as actual engine coolant temperature C HINT: If there is an open circuit, the Techstream indicates -40°C (-40°F). If there is a short circuit, the Techstream indicates 140°C (284°F) or more. C --> See step 6 B --> See step 4 A: Go to next step
2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN SENSOR) Disconnect the engine coolant temperature sensor connector. Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the value displayed on the Techstream. Standard 140°C (284°F) or more Reconnect the engine coolant temperature sensor connector. NG --> See step 3 OK --> See step 7
3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM) Disconnect the engine coolant temperature sensor connector. Connect terminals THW and E2 of the ECM connector. HINT: Before checking, do visual and contact pressure checks on the ECM connector. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the value displayed on the Techstream. Standard 140°C (284°F) or more Reconnect the engine coolant temperature sensor connector. NG --> See step 8 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR
4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN SENSOR) Disconnect the engine coolant temperature sensor connector. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the value displayed on the Techstream. Standard -40°C (-40°F) Reconnect the engine coolant temperature sensor connector. NG --> See step 5 OK --> See step 9
5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN ECM) Disconnect the ECM connector. Disconnect the engine coolant temperature sensor connector. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the value displayed on the Techstream. Standard -40°C (-40°F) Reconnect the engine coolant temperature sensor connector. Reconnect the ECM connector. NG --> See step 10 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__check-for-intermittent-problems)
7. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
9. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
10. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

Refer to DTC P0115. Refer to DESCRIPTION .

Engine coolant temperature sensor cold start monitor

When a cold engine start is performed and then the engine is warmed up, if the engine coolant temperature sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.

Engine coolant temperature sensor soak monitor

If the engine coolant temperature sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.

ENGINE COOLANT TEMPERATURE SENSOR COLD START MONITOR

ENGINE COOLANT TEMPERATURE SENSOR SOAK MONITOR

ENGINE COOLANT TEMPERATURE SENSOR COLD START MONITOR

ENGINE COOLANT TEMPERATURE SENSOR SOAK MONITOR

Scheme 411

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Enter the following menu items: Powertrain / Engine / Data List / Coolant Temp.
4. Check that the coolant temperature is 60°C (140°F) or less.
5. 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) .
6. Turn the engine switch off and wait for 30 seconds.
7. Turn the engine switch on (IG) and turn the Techstream on [A].
8. Start the engine and idle it for 5 minutes or more [B]. HINT: If the engine coolant temperature does not change by 5°C (9°F) or higher, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.
9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
10. Read the pending DTC [C]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P0116.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform steps [D] and [E].
14. Drive the vehicle at 25 mph (40 km/h) or more for a total of 5 minutes or more [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: In the event of the drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed.
15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
16. Check the DTC judgment result [E]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. If any of DTCs P0115, P0117, P0118 or P0125 are set simultaneously with DTC P0116, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116) 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 DTC. Result Result Proceed to DTC P0116 is output A DTC P0116 and other DTCs are output B HINT: If any DTCs other than P0116 are output, troubleshoot those DTCs first. B --> See step 3 A: Go to next step
2. INSPECT WATER INLET WITH THERMOSTAT Remove the water inlet with thermostat. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/cooling-fan/#cooling-service-information) . Check the valve opening temperature of the thermostat. Standard 80°C to 84°C (176°F to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard. Reinstall the water inlet with thermostat. Refer to «INSTALLATION»(/lexus/is-f/i-2007-2014/remont/cooling-fan/#cooling-service-information) . NG --> See step 4 OK --> See step 5
3. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__diagnostic-trouble-code-chart)
4. REPLACE WATER INLET WITH THERMOSTAT. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/cooling-fan/#cooling-service-information)
5. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The engine has two temperature sensors, an engine coolant temperature sensor and an intake air temperature sensor, to detect the temperature while the engine is operating. A thermistor, whose resistance value varies according to the temperature, is built into each sensor. When the temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes. Based on these temperature signals output from the sensors, the ECM determines the fuel injection time and the ignition timing to control the engine.

Scheme 412

HINT

1. Waiting is required to prevent the temperature of the engine from affecting the readings. If the engine has been operated recently, it will not be possible to accurately compare the readings.

1. For diagnosis, in order to duplicate the detection conditions of the DTC, it is necessary to park the vehicle for 7 hours. Parking the vehicle for 7 hours ensures that the actual temperature of the engine coolant temperature and intake air temperature are very similar. When the vehicle has been parked for less than 7 hours, differences in the readings may exist, this does not necessarily indicate a fault.

The ECM monitors the difference between the engine coolant temperature and the intake air temperature when the engine is started cold to detect the engine temperature conditions accurately. The monitor runs when the engine started cold after 7 hours or more has elapsed since the engine was stopped (engine switch turned to OFF) on the previous trip. If the difference between the engine coolant temperature and the intake air temperature on a cold start exceeds 20°C (36°F), the ECM interprets this as a malfunction in the engine coolant temperature sensor circuit and intake air temperature sensor circuit, and sets the DTC.

Scheme 413

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) [A].
4. Turn the engine switch off.
5. With the engine stopped, leave the vehicle as is for 7.5 hours or more [B].
6. Start the engine and wait 60 seconds or more [C].
7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
8. 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.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P011B.
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 malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [A] through [C] 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.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P011B) 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 P011B A P011B and other DTCs B HINT: If any DTCs other than P011B are output, troubleshoot those DTCs first. B --> See step 4 A: Go to next step
2. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE) Leave the vehicle for 7 hours or more. HINT: It is necessary to leave the vehicle for 7 hours or more to allow conditions similar to the DTC detection conditions. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Intake Air. Read the value displayed on the Techstream. OK Difference between the intake air temperature and the actual outside air temperature is within 10°C (18°F). HINT: Temperature readings on the vehicle outside temperature gauge (if equipped) are not suitable for comparing to the intake air temperature reading. The outside temperature gauge has a significant delay built in to prevent temperature swings from being displayed on its display. Use an accurate thermometer to determine the outside air temperature. NG --> See step 5 OK: Go to next step
3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the value displayed on the Techstream. OK The difference between the coolant temperature and the actual outside air temperature is within 10°C (18°F). HINT: If the result is not as specified, check if there are heat sources such as a block heater in the engine compartment. NG --> See step 7 OK --> See step 6
4. 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)
5. REPLACE MASS AIR FLOW METER. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
7. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

HINT

1. These DTCs relate to the throttle position sensor.

The throttle position sensor is mounted on the throttle body assembly, and detects the opening angle of the throttle valve. This sensor is a non-contact type sensor. It 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 throttle position sensor has 2 sensor circuits, each of which transmits a signal, VTA and VTA2. VTA is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA. The sensor signal voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA terminals of the ECM.

As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output voltage increases. The ECM calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to driver inputs. These signals are also used in calculations such as air fuel ratio correction, power increase correction and fuel-cut control.

Scheme 414

HINT

1. When any of these DTCs are output, check the throttle valve opening angle using the Techstream. Enter the following menus: Powertrain / Engine / Data List / Throttle Position No. 1 and Throttle Position No. 2.

1. Throttle Position No. 1 is the VTA signal, and Throttle Position No. 2 is the VTA2 signal. Reference (Normal Condition) Techstream Display Accelerator Pedal Fully Released Accelerator Pedal Fully Depressed Throttle Position No. 1 0.5 to 1.1 V 3.2 to 4.8 V Throttle Position No. 2 2.1 to 3.1 V 4.6 to 5.0 V

P0120, P0122, P0123, P0220, P0222, P0223, P2135

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the throttle position sensor.

1. A specific voltage difference is expected between the sensor terminals, VTA and VTA2, for each throttle valve opening angle. If the difference between VTA and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

1. VTA and VTA2 each have a specific voltage range. If VTA or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

1. VTA and VTA2 should never be close to the same voltage level. If VTA is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor circuit, and stores a DTC.

If the malfunction is not repaired successfully, a DTC is stored 10 seconds after the engine is next started.

P0121

This sensor transmits 2 signals: VTA and VTA2. VTA is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA. The ECM performs several checks to confirm the proper operation of the throttle position sensor and VTA.

For each throttle opening angle, a specific voltage difference is expected between the outputs of VTA and VTA2. If the output voltage difference between the 2 signals deviates from the normal operating range, the ECM interprets this as a malfunction in the throttle position sensor. The ECM illuminates the MIL and stores the DTC.

If the malfunction is not repaired successfully, the DTC is stored 2 seconds after the engine is next started.

P0120, P0122, P0123, P0220, P0222, P0223, P2135

P0121

P0120

P0121

P0122

P0123

P0220

P0222

P0223

P2135 CASE 1

P2135 CASE 2

Scheme 415

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 and release the accelerator pedal [B].
8. Idle the engine for 2 seconds or more [C].
9. Enter the following menus: Powertrain / Engine / Trouble Codes.
10. Read the DTC [D]. 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: P0120, P0121, P0122, P0123, P0220, P0222, P0223 or P2135.
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 steps [B] through [C] 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 any of these DTCs, as well as other DTCs relating to electronic throttle control system malfunctions are 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 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 416

HINT

1. If other DTCs relating to different systems that have terminal ETA as the ground terminal are output simultaneously, terminal ETA may have an open circuit.
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 417

1. READ VALUE USING TECHSTREAM (THROTTLE POSITION SENSOR) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Throttle Position No. 1 and Throttle Position No. 2. Read the values displayed on the Techstream. RESULT When Accelerator Pedal Released When Accelerator Pedal Depressed Trouble Area Proceed to Throttle Position No. 1 Throttle Position No. 2 Throttle Position No. 1 Throttle Position No. 2 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V VCTA circuit open A 4.5 to 5.0 V 4.5 to 5.0 V 4.5 to 5.0 V 4.5 to 5.0 V ETA circuit open 0 to 0.2 V, or 4.5 to 5.0 V 2.1 V to 3.1 V (Fail-safe) 0 to 0.2 V, or 4.5 to 5.0 V 2.1 V to 3.1 V (Fail-safe) VTA circuit open or ground short 0.6 V to 1.4 V (Fail-safe) 0 to 0.2 V, or 4.5 to 5.0 V 0.6 V to 1.4 V (Fail-safe) 0 to 0.2 V, or 4.5 to 5.0 V VTA2 circuit open or ground short 0.5 to 1.1 V 2.1 to 3.1 V 3.2 to 4.8 V (Not fail-safe) 4.6 to 5.0 V (Not fail-safe) Throttle position sensor circuit normal B HINT: DTC P0121 is stored when the voltages output from VTA and VTA2 are not consistent with the characteristics of the sensors. Therefore, check the Freeze Frame Data when this DTC is output. Use the following formula to confirm relative fluctuations in voltage. Features of sensor output VTA2 x 0.8 is approximately equal to VTA + 1.11 V VTA: Throttle Position No. 1 VTA2: Throttle position No. 2 If DTC P0121 is output, proceed to the "CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)". B --> See step 5 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - 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 E17-5 (VC) - E4-34 (VCTA) Always Below 1 ohms E17-6 (VTA) - E4-26 (VTA) Always Below 1 ohms E17-4 (VTA2) - E4-27 (VTA2) Always Below 1 ohms E17-3 (E2) - E4-35 (ETA) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition E17-5 (VC) or E4-34 (VCTA)- Body ground Always 10 kohms or higher E17-6 (VTA) or E4-26 (VTA) - Body ground Always 10 kohms or higher E17-4 (VTA2) or E4-27 (VTA2) - 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 ECM (VCTA VOLTAGE) Disconnect the throttle body assembly 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 E4-34 (VCTA) - E4-35 (ETA) Engine switch on (IG) 4.5 to 5.0 V Reconnect the throttle body assembly connector. NG --> See step 6 OK: Go to next step
4. REPLACE THROTTLE BODY ASSEMBLY Replace the throttle body assembly. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
5. CHECK WHETHER DTC OUTPUT RECURS (THROTTLE 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 or more. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0120, P0122, P0123, P0220, P0223, and/or P2135 are output A DTC is not output B B --> END A --> See step 6
6. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

Refer to DTC P0115. Refer to DESCRIPTION .

The resistance of the engine coolant temperature sensor varies in proportion to the actual engine coolant temperature. The ECM supplies a constant voltage to the sensor and monitors the signal output voltage of the sensor. The signal voltage output varies according to the changing resistance of the sensor. After the engine is started, the engine coolant temperature is monitored through this signal. If the engine coolant temperature sensor indicates that the engine is not yet warm enough for closed loop fuel control, despite a specified period of time having elapsed since the engine was started, the ECM interprets this as a malfunction in the sensor or cooling system and sets the DTC.

Example

The engine coolant temperature is 0°C (32°F) at engine start. After about 1 minute running time, the engine coolant temperature sensor still indicates that the engine is not warm enough to begin closed loop fuel (air fuel ratio feedback) control. The ECM interprets this as a malfunction in the sensor or cooling system and sets the DTC.

Scheme 418

1. Leave the vehicle outside overnight.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and turn the Techstream on.
4. Enter the following menu items: Powertrain / Engine / Data List / Coolant Temp.
5. Check that the engine coolant temperature is 5°C (41°F) or less.
6. 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) .
7. Turn the engine switch off and wait for 30 seconds.
8. Turn the engine switch on (IG) and turn the Techstream on [A].
9. Start the engine.
10. Wait 21 minutes or more [B].
11. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
12. Read the pending DTC [C]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Input the DTC: P0125.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result sows INCOMPLETE or UNKNOWN, perform step [B] again.
16. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
17. 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.
18. 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 P0115. Refer to WIRING DIAGRAM .

HINT

1. If any of DTCs P0115, P0116, P0117 or P0118 are set simultaneously with DTC P0125, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125) 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 P0125 is output A DTC P0125 and other DTCs are output B HINT: If any DTCs other than P0125 are output, troubleshoot those DTCs first. B --> See step 4 A: Go to next step
2. INSPECT WATER INLET WITH THERMOSTAT Remove the water inlet with thermostat. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/cooling-fan/#cooling-service-information) . Check the valve opening temperature of the thermostat. Standard 80 to 84°C (176 to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard. NG --> See step 5 OK: Go to next step
3. CHECK COOLING SYSTEM Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications. NG --> REPAIR OR REPLACE COOLING SYSTEM OK --> See step 6
4. 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)
5. REPLACE WATER INLET WITH THERMOSTAT. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/cooling-fan/#cooling-service-information)
6. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

This DTC is set when the engine coolant temperature does not reach 75°C (167°F) despite sufficient engine warm-up time.

Scheme 419

The ECM estimates the engine coolant temperature based on the starting temperature, engine loads, and engine speeds. The ECM then compares the estimated temperature with the actual engine coolant temperature. When the estimated engine coolant temperature reaches 75°C (167°F), the ECM checks the actual engine coolant temperature. If the actual engine coolant temperature is less than 75°C (167°F), the ECM interprets this as a malfunction in the thermostat or the engine cooling system and sets the DTC.

Scheme 420

1. Stop the engine and allow it to cool down.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and turn the Techstream on [A].
4. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp and Intake Air.
5. Check that "Coolant Temp" is 56°C (133°F) or less and "Intake Air" is between 0 and 35°C (32 and 95°F).
6. Set the heater to MAX HOT with fresh air mode selected and turn the A/C off.
7. Start the engine and drive the vehicle at 50 mph (80 km/h) for 15 minutes [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: Data can be captured relatively easily by using the snapshot function in the Data List. Enter the following menus: Data List / Function / Snap-shot configuration / Record time / 5 min. Data capture can be started by using the target point function. For example, setting the target point to an engine speed of 4000 rpm and then racing the engine, etc. to raise the engine speed to a speed of 4000 rpm or more will cause data capture to start.
8. After "Coolant Temp" stabilizes, check that "Coolant Temp" is 75°C (167°F) or higher [C]. HINT: If "Coolant Temp" is below 75°C (167°F) while driving the vehicle at 50 mph (80 km/h), inspect the cooling system and thermostat.

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128) 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 DTC. Result Result Proceed to DTC P0128 is output A DTC P0128 and other DTCs are output B HINT: If any DTCs other than P0128 are output, troubleshoot those DTCs first. B --> See step 4 A: Go to next step
2. CHECK COOLING SYSTEM Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications. NG --> REPAIR OR REPLACE COOLING SYSTEM OK: Go to next step
3. INSPECT WATER INLET WITH THERMOSTAT Remove the water inlet with thermostat. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/cooling-fan/#cooling-service-information) . Check the valve opening temperature of the thermostat. Standard 80 to 84°C (176 to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard. NG --> See step 5 OK --> See step 6
4. 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)
5. REPLACE WATER INLET WITH THERMOSTAT. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/cooling-fan/#cooling-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

HINT

Sensor 2 refers to the sensor mounted behind the three-way catalytic converter and located far from the engine assembly.

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon 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 air fuel level. For the purpose of helping the ECM to deliver accurate air fuel ratio control, a heated oxygen sensor is used.

The heated oxygen sensor is located behind the three-way catalytic converter, and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low).

When the air fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The heated oxygen sensor informs the ECM that the post-three-way catalytic converter air fuel ratio is lean (low voltage, i.e. less than 0.45 V).

Conversely, when the air fuel ratio is richer than the stoichiometric air fuel level, the oxygen concentration in the exhaust gas becomes lean. The heated oxygen sensor informs the ECM that the post-three-way catalytic converter air fuel ratio is rich (high voltage, i.e. more than 0.45 V). The heated oxygen sensor has the property of changing its output voltage drastically when the air fuel ratio is close to the stoichiometric level.

The ECM uses the supplementary information from the heated oxygen sensor to determine whether the air fuel ratio after the three-way catalytic converter is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the heated oxygen sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air fuel ratio control.

Scheme 421

Scheme 422

Scheme 423

Scheme 424

1. Active Air Fuel Ratio Control The ECM usually performs air fuel ratio feedback control so that the air fuel ratio sensor output indicates a near stoichiometric air fuel level. This vehicle includes active air fuel ratio control in addition to regular air fuel ratio control. The ECM performs active air fuel ratio control to detect any deterioration in the three-way catalytic converter and heated oxygen sensor malfunctions (refer to the diagram below). Active air fuel ratio control is performed for approximately 15 to 20 seconds while driving with a warm engine. During active air fuel ratio control, the air fuel ratio is forcibly regulated to become lean or rich by the ECM. If the ECM detects a malfunction, a DTC is set.
2. Abnormal Voltage Output of Heated Oxygen Sensor (DTC P0136 and P0156) While the ECM is performing active air fuel ratio control, the air fuel ratio is forcibly regulated to become rich or lean. If the sensor is not functioning properly, the voltage output variation is small. For example, when the heated oxygen sensor voltage does not decrease to less than 0.21 V or does not increase to more than 0.59 V during active air fuel ratio control, the ECM determines that the sensor voltage output is abnormal and sets DTCs P0136 or P0156.
3. Open or Short in Heated Oxygen Sensor Circuit (DTCs P0137 and P0157 or P0138 and P0158) During active air fuel ratio control, the ECM calculates the oxygen storage capacity* of the three-way catalytic converter by forcibly regulating the air fuel ratio to become rich or lean. If the heated oxygen sensor has an open or short, or the voltage output of the sensor noticeably decreases, the oxygen storage capacity indicates an extraordinarily high value. Even if the ECM attempts to continue regulating the air fuel ratio to become rich or lean, the heated oxygen sensor output does not change. While performing active air fuel ratio control, when the target air fuel ratio is rich and the heated oxygen sensor voltage output is less than 0.21 V (lean), the ECM interprets this as an abnormally low sensor output voltage and sets DTC P0137 or P0157. When the target air fuel ratio is lean and the voltage output is more than 0.59 V (rich) during active air fuel ratio control, the ECM determines that the sensor voltage output is abnormally high, and sets DTC P0138 or P0158. HINT: DTC P0138 or P0158 is also set if the heated oxygen sensor voltage output is more than 1.2 V for 10 seconds or more. *: The three-way catalytic converter has the capability to store oxygen. The oxygen storage capacity and the emission purification capacity of the three-way catalytic converter are mutually related. The ECM determines whether the catalyst has deteriorated, based on the calculated oxygen storage capacity value. Refer to «DESCRIPTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0201-p0657) .
4. High or Low Impedance of Heated Oxygen Sensor (DTCs P0136 and P0156 or P0137 and P0157) During normal air fuel ratio feedback control, there are small variations in the exhaust gas oxygen concentration. In order to continuously monitor the slight variation of the heated oxygen sensor signal while the engine is running, the impedance* of the sensor is measured by the ECM. The ECM determines that there is a malfunction in the sensor when the measured impedance deviates from the standard range. *: The effective resistance in an alternating current electrical circuit. HINT: The impedance cannot be measured using an ohmmeter. DTCs P0136 and P0156 indicate the deterioration of the heated oxygen sensor. The ECM sets the DTCs by calculating the impedance of the sensor when the typical enabling conditions are satisfied (2 driving cycles). DTCs P0137 and P0157 indicate an open or short circuit in the heated oxygen sensor (2 driving cycles). The ECM sets the DTCs when the impedance of the sensor exceeds the threshold 15 kohms.
5. Heated Oxygen Sensor Voltage Fuel cut (DTC P0139 or P0159) The sensor output voltage drops to below 0.2 V (extremely Lean status) immediately when the vehicle decelerates and fuel cut is operating. If the voltage does not drop to below 0.2 V for 7 seconds or more, or voltage does not drop from 0.35 V to 0.2 V for 1 second, the ECM determines that the sensor's response has deteriorated, illuminates the MIL and sets a DTC.

All

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (OUTPUT VOLTAGE, HIGH VOLTAGE AND LOW VOLTAGE)

HEATED OXYGEN SENSOR IMPEDANCE (LOW IMPEDANCE)

HEATED OXYGEN SENSOR IMPEDANCE (HIGH IMPEDANCE)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (EXTREMELY HIGH)

HEATED OXYGEN SENSOR VOLTAGE DURING FUEL CUT

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (OUTPUT VOLTAGE)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (LOW OUTPUT VOLTAGE)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (HIGH OUTPUT VOLTAGE)

HEATED OXYGEN SENSOR IMPEDANCE (LOW IMPEDANCE)

HEATED OXYGEN SENSOR IMPEDANCE (HIGH IMPEDANCE)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (EXTREMELY HIGH)

HEATED OXYGEN SENSOR VOLTAGE DURING FUEL CUT

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

P0136, P0137, P0138, P0156, P0157 and P0158

Scheme 425

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. With the transmission in 4th gear or higher, drive the vehicle at 37 to 75 mph (60 to 120 km/h) for 10 minutes or more [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
8. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
9. 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.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0136, P0137, P0138, P0156, P0157 or P0158.
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 [C] 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.

P0139 and P0159

Scheme 426

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
7. Drive the vehicle at 37 mph (60 km/h), and then decelerate the vehicle by releasing the accelerator pedal for 9 seconds or more to perform the fuel-cut [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
8. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
9. Read the pending DTC [D]. HINT: If a pending DTC or current DTC is output, the system is malfunctioning. If a pending DTC or current DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P0139 or P0159.
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, shift the transmission to 2nd gear, and then perform step [C] again.
13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
14. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 427

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.
3. Turn the Techstream on.
4. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
6. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume.)
7. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 or AFS Voltage B2S1 and O2S B1S2 or 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 428

Scheme 429

Scheme 430

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 or AFS Voltage B2S1 and O2S B1S2 or O2S B2S2 then press the graph button on the Data List view.

HINT

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
2. If the OX1B or OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 or P0156 may be set.

Scheme 431

Scheme 432

Scheme 433

1. READ DTC OUTPUT (DTC P0136, P0137, P0138, P0139, P0156, P0157, P0158 OR P0159) 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 P0138 or P0158 is output A DTC P0137 or P0157 is output B DTC P0136 or P0156 is output C DTC P0139 or P0159 is output D D --> See step 18 C --> See step 7 B --> See step 9 A: Go to next step
2. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / A/F Control System / O2S B1S2 or O2S B2S2. Allow the engine to idle. Read the heated oxygen sensor output voltage while idling. Result Result Proceed to 1.0 V or higher A Below 1.0 V B B --> See step 5 A: Go to next step
3. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT) Disconnect the heated oxygen sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Bank 1 Bank 2 Tester Connection Condition Specified Condition 2 (+B) - 4 (E2) Always 10 kohms or higher 2 (+B) - 3 (OX1B) Tester Connection Condition Specified Condition 2 (+B) - 4 (E2) Always 10 kohms or higher 2 (+B) - 3 (OX2B) Reconnect the heated oxygen sensor connector. NG --> See step 22 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT) Turn the engine switch off and wait for 5 minutes or more. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Bank 1 Bank 2 Tester Connection Condition Specified Condition A6-4 (HT1B) - A6-26 (OX1B) Always 10 kohms or higher Tester Connection Condition Specified Condition A6-3 (HT2B) - A6-27 (OX2B) Always 10 kohms or higher Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 23
5. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME) 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 Injection Volume. Change the fuel injection volume using the Techstream, and monitor the voltage output of air fuel ratio and heated oxygen sensors displayed on the Techstream. HINT: Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 1% graduations within the range. The air fuel ratio sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the heated oxygen sensor is displayed as O2S B1S2 or O2S B2S2 on the Techstream. 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. Result Tester Display Voltage Variation Proceed to AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK Remains at more than 3.3 V NG Remains at less than 3.3 V NG HINT: A normal heated oxygen sensor voltage (O2S B1S2 or O2S B2S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning. NG --> See step 15 OK: Go to next step
6. INSPECT AIR FUEL RATIO SENSOR HINT: This air fuel ratio sensor test is to check the air fuel ratio sensor current during the fuel-cut. When the sensor is normal, the sensor current will indicate below 3.0 mA in this test. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Drive the vehicle by the drive pattern as listed below: Warm up the engine until the engine coolant temperature reaches 75°C (167°F) or more. Drive the vehicle at 37 mph (60 km/h) or more and decelerate the vehicle for 5 seconds or more. Repeat the deceleration above at least 3 times. Enter the following menus: Powertrain / Engine / Monitor / O2 Sensor / Details. Confirm that RANGE B1S1and RANGE B2S1 are either Pass or Fail. If the Techstream shows Incomplete, re-check RANGE B1S1 and RANGE B2S1 after performing the drive pattern. Select the RANGE B1S1 and RANGE B2S1. Read the Test Value. Standard Current Less than 3.0 mA HINT: If the Techstream shows Incomplete again, increase the vehicle speed and use the second gear to decelerate the vehicle. NG --> See step 15 OK --> See step 12
7. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Data List / A/F Control System / O2S B1S2 or O2S B2S2. After warming up the engine, run the engine at an engine speed of 2500 rpm for 3 minutes. Read the output voltage of the heated oxygen sensor when the engine rpm is suddenly increased. HINT: Quickly accelerate the engine to 4000 rpm 3 times using the accelerator pedal. Standard Fluctuates between 0.4 V or less and 0.55 V or more. NG --> See step 9 OK: Go to next step
8. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME) 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 Injection Volume. Change the fuel injection volume using the Techstream, and monitor the voltage output of air fuel ratio and heated oxygen sensors displayed on the Techstream. HINT: Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 1% graduations within the range. The air fuel ratio sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the heated oxygen sensor is displayed as O2S B1S2 or O2S B2S2 on the Techstream. 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. Result Tester Display Voltage Variation Proceed to AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK Remains at more than 3.3 V NG Remains at less than 3.3 V NG HINT: A normal heated oxygen sensor voltage (O2S B1S2 or O2S B2S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning. NG --> See step 15 OK --> See step 24
9. INSPECT FOR EXHAUST GAS LEAK Check for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK: Go to next step
10. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the heated oxygen sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Bank 1 Sensor 2) Tester Connection Condition Specified Condition 1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT1B) - 4 (E2) Always 10 kohms or higher Standard Resistance (Bank 2 Sensor 2) Tester Connection Condition Specified Condition 1 (HT2B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT2B) - 4 (E2) Always 10 kohms or higher Reconnect the heated oxygen sensor connector. NG --> See step 22 OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the heated oxygen sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Bank 1 Bank 2 Tester Connection Condition Specified Condition J94-1 (HT1B) - A6-4 (HT1B) Always Below 1 ohms J94-3 (OX1B) - A6-26 (OX1B) J94-4 (E2) - E3-28 (E2) Tester Connection Condition Specified Condition J95-1 (HT2B) - A6-3 (HT2B) Always Below 1 ohms J95-3 (OX2B) - A6-27 (OX2B) J95-4 (E2) - E3-28 (E2) Standard Resistance (Check for Short) Bank 1 Bank 2 Tester Connection Condition Specified Condition J94-1 (HT1B) or A6-4 (HT1B) - Body ground Always 10 kohms or higher J94-3 (OX1B) or A6-26 (OX1B) - Body ground Tester Connection Condition Specified Condition J95-1 (HT2B) or A6-3(HT2B) - Body ground Always 10 kohms or higher J95-3 (OX2B) or A6-27 (OX2B) - Body ground Reconnect the heated oxygen sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
12. REPLACE HEATED OXYGEN SENSOR Replace the heated oxygen sensor. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NEXT: Go to next step
13. PERFORM CONFIRMATION DRIVING PATTERN Refer to the confirmation driving pattern for P0136, P0137, P0138, P0156, P0157 and P0158. NEXT: Go to next step
14. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138, P0156, P0157 OR P0158) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P0136, P0137, P0138, P0156, P0157 or P0158. Check the DTC Monitor is NORMAL. If DTC Monitor is INCOMPLETE, perform the driving pattern adding the vehicle speed. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0136, P0137, P0138, P0156, P0157 or P0158 is output) B B --> See step 25 A --> END
15. 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
16. PERFORM CONFIRMATION DRIVING PATTERN Refer to the confirmation driving pattern for P0136, P0137, P0138, P0156, P0157 and P0158. NEXT: Go to next step
17. CHECK WHETHER DTC OUTPUT RECURS (P0136, P0138, P0156 OR P0158) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input DTCs: P0136, P0138, P0156 and P0158. Check that DTC Monitor is NORMAL. If DTC Monitor is INCOMPLETE, perform the driving pattern adding the vehicle speed. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0136, P0138, P0156 or P0158 is output) B B --> See step 22 A --> END
18. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / A/F Control System / O2S B1S2 or O2S B2S2. Allow the engine to idle. Read the heated oxygen sensor output voltage while idling. Result Result Proceed to 1.0 V or higher A Below 1.0 V B B --> See step 21 A: Go to next step
19. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT) Disconnect the heated oxygen sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Bank 1 Bank 2 Tester Connection Condition Specified Condition 2 (+B) - 4 (E2) Always 10 kohms or higher 2 (+B) - 3 (OX1B) Tester Connection Condition Specified Condition 2 (+B) - 4 (E2) Always 10 kohms or higher 2 (+B) - 3 (OX2B) Reconnect the heated oxygen sensor connector. NG --> See step 22 OK: Go to next step
20. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT) Turn the engine switch off and wait for 5 minutes or more. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Bank 1 Bank 2 Tester Connection Condition Specified Condition A6-4 (HT1B) - A6-26 (OX1B) Always 10 kohms or higher Tester Connection Condition Specified Condition A6-3 (HT2B) - A6-27 (OX2B) Always 10 kohms or higher Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 23
21. READ VALUE USING DTC OUTPUT (DTC P0139 OR P0159 IS OUTPUT AGAIN) 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. Start the engine and turn the Techstream on [A]. Warm-up the engine until the engine coolant temperature is 75°C (167°F) or more [B]. Drive the vehicle 37 mph (60 km/h) and decelerate the vehicle for 9 seconds or more [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input DTCs: P0139 and P0159. Check that DTC Monitor is NORMAL. If DTC Monitor is INCOMPLETE, perform the driving pattern adding the vehicle speed and using the second gear to decelerate the vehicle [D]. Result Display (DTC Output) Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0139 or P0159 is output) B B --> See step 22 A --> See step 26
22. REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
23. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
24. CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO. Refer to «DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2); DTC P1170: Port Injector Fuel Performance; DTC P117B: Direct Injector Fuel Performance»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p0010-p0193)
25. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
26. 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 fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim consists of both the short-term and the long-term fuel trim.

The short-term fuel trim is fuel compensation that is used to constantly maintain the air fuel ratio at stoichiometric levels. The signal from the air fuel ratio sensor indicates whether the air fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air fuel ratio is rich and an increase in the fuel injection volume if it is lean.

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the ideal theoretical value. The long-term fuel trim controls overall fuel compensation. The long-term fuel trim compensates for long term deviations of the fuel trim from the ideal theoretical value. These long term deviations result from the corrections made by the short-term fuel trim.

If both the short-term fuel and long-term fuel trim are lean or rich beyond predetermined values, it is interpreted as a malfunction, the ECM illuminates the MIL and sets a DTC.

HINT

If the vehicle runs out of fuel, the air fuel ratio is lean and DTC P0171 or P0174 may be set. The MIL is then illuminated.

Under closed loop fuel control, fuel injection volumes that deviate from those estimated by the ECM cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. Deviations from the ECM's estimated fuel injection volumes also affect the average fuel trim learning value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learning value of the air fuel ratio). If the average fuel trim learning value exceeds the malfunction threshold, the ECM interprets this as a malfunction in the fuel system and sets a DTC.

1. Example: If the average fuel trim learning value is 35% or more or -35% or less, the ECM interprets this as a fuel system malfunction.

Scheme 434

FUEL-TRIM LEAN/RICH (P0171, P0172, P0174, P0175)

FUEL TRIM (PORT INJECTION, P1170)

FUEL TRIM (DIRECT INJECTION, P117B)

Scheme 435

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. HINT: Let the engine cool down. Touch a radiator hose to check that the coolant temperature has dropped.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or more) with all the accessories switched off [B].
7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
8. Read the pending DTC [C]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Drive the vehicle at between 37 mph and 75 mph (60 km/h and 120 km/h) and at an engine speed of between 1400 rpm and 3200 rpm for 5 minutes or more [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
10. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
11. Read the pending DTC [E]. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Input the DTC: P0171, P0172, P0174 or P0175, P1170 or P117B.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [D] again.
15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
16. Check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

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 2000 rpm for approximately 90 seconds.
4. On the Techstream, 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 sensors 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)

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 sensors 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 436

1. CHECK ANY OTHER DTCS OUTPUT Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0171, P0172, P0174, P0175, P1170 and/or P117B are output A DTC P0171, P0172, P0174, P0175, P1170 and/or P117B and other DTCs are output B HINT: If any DTCs other than P0171, P0172, P0174, P0175, P1170 or P117B are output, troubleshoot those DTCs first. B --> See step 26 A: Go to next step
2. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port. Read the value. Enter: Data List / A/F Control System / Short FT #1 and Long FT #1 and/or Short FT #2 and Long FT #2. OK Short FT #1, #2 + Long Ft #1, #2 = Between -19% and +19% Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. Read the value. Enter: Data List / A/F Control System / Short FT #1 and Long FT #1 and/or Short FT #2 and Long FT #2. OK Short FT #1, #2 + Long Ft #1, #2 = Between -19% and +19% Result Item Proceed to Port Direct OK OK A OK NG B NG OK C NG NG D D --> See step 4 C --> See step 25 B --> See step 19 A: Go to next step
3. CHECK IF VEHICLE HAS RUN OUT OF FUEL IN PAST Has the vehicle run out of fuel in the past? NO --> See step 27 YES --> DTC CAUSED BY RUNNING OUT OF FUEL
4. CHECK PCV HOSE OK PCV hose is connected correctly and is not damaged. NG --> See step 28 OK: Go to next step
5. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection) . OK No leaks from intake system. NG --> See step 29 OK: Go to next step
6. PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Warm up the engine at an engine speed of 2000 rpm for approximately 90 seconds. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the output voltages of the air fuel ratio sensors and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has maximum output delay of approximately 20 seconds. Tester Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) +25% Rich Less than 3.1 V AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) -12.5% Lean More than 3.4 V O2S B1S2 or O2S B2S2 (Heated oxygen) +25% Rich More than 0.55 V O2S B1S2 or O2S B2S2 (Heated oxygen) -12.5% Lean Less than 0.4 V Result Status AFS Voltage B1S1 or AFS Voltage B2S1 Status O2S B1S2 or O2S B2S2 Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition Misfire Suspected Trouble Area Proceed to Lean/Rich Lean/Rich Normal - - A Lean Lean Actual air fuel ratio lean May occur PCV valve and hose PCV hose connections Injector assembly for port injection Injector assembly for direct injection Gas leaks from exhaust system Intake system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor A Rich Rich Actual air fuel ratio rich - Injector assembly for port injection Injector assembly for direct injection Gas leaks from exhaust system Ignition system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor A Lean Lean/Rich Air fuel ratio sensor malfunction - Air fuel ratio sensor B Rich Lean/Rich Air fuel ratio sensor malfunction - Air fuel ratio sensor B Lean: During Control the Injection Volume for A/F sensor, the air fuel ratio sensor output voltage (AFS) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V. Rich: During Control the Injection Volume for A/F sensor, the AFS is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V. B --> See step 10 A: Go to next step
7. READ VALUE USING TECHSTREAM (COOLANT TEMP) 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 / Coolant Temp. Read the Data List twice, when the engine is both cold and warmed up. Standard With cold engine Same as ambient air temperature. With warm engine Between 75 and 95°C (167 and 203°F) NG --> See step 30 OK: Go to next step
8. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY Inspect the mass air flow meter sub-assembly. Refer to «ON-VEHICLE INSPECTION»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information) . NG --> See step 31 OK: Go to next step
9. CHECK FOR EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST SYSTEM OK --> See step 13
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 32 OK: Go to next step
11. 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 ECM connector. Reconnect the air fuel ratio sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
12. 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
13. PERFORM CONFIRMATION DRIVING PATTERN 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) . Turn the engine switch off and wait for 30 seconds. Turn the engine switch on (IG) and turn the Techstream on. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
14. CHECK WHETHER DTC OUTPUT RECURS Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input the DTC: P0171, P0172, P0174, P0175, P1170 or P117B. Check the DTC judgment result. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (P0171, P0172, P0174, P0175, P1170 and/or P117B are output) B A --> END B: Go to next step
15. CHECK FUEL PRESSURE (LOW PRESSURE) Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-inspection) . NG --> See step 16 OK --> See step 33
16. 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 34 OK: Go to next step
17. CHECK FUEL LEAK (LOW PRESSURE SIDE) Check for fuel leaks (low pressure side). OK No leaks. NG --> REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step
18. CHECK FUEL LINE Check the fuel line for leaks or blockage. OK No leaks or blockage. NG --> REPAIR OR REPLACE FUEL LINE OK --> CHECK AND REPLACE FUEL SYSTEM (FUEL PRESSURE REGULATOR, FUEL FILTER)
19. CHECK FUEL PRESSURE SENSOR Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. While revving the engine, check that the fuel pressure fluctuates. Standard Idling 3500 to 4500 kPa 2000 rpm (No load) 7000 to 9000 kPa HINT: The A/C switch and all accessory switches should be off, and the shift lever should be in N or P, and the engine should be fully warmed up. NG --> See step 22 OK: Go to next step
20. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. HINT: The A/C switch and all accessory switches should be off, and the shift lever should be in N or P, and the engine should be fully warmed up. Read the value. Enter: Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4). Result Item Proceed to Fuel Pump Duty (D4) Short FT #1 + Long FT #1 Short FT #2 + Long FT #2 40% or more -20% or less -20% or less A 10% or less +20% or more +20% or more A 40% or more +20% or more +20% or more B 10% or less -20% or less -20% or less C 10% to 40% - - D C --> See step 36 B --> See step 24 A --> See step 35 D: Go to next step
21. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Start the engine and turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection way / Direct. HINT: The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up. Read the value of Data List: Enter: Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4). Result Item Proceed to Fuel Pump Duty (D4) Short FT #1 + Long FT #1 Short FT #2 + Long FT #2 10% to 40% -25% or less -25% or less A 10% to 40% -25% or less -25% to +25% B 10% to 40% -25% to +25% -25% or less C 10% to 40% +30% or more +30% or more A 10% to 40% +25% or more -25% to +25% B 10% to 40% -25% to +25% +25% or more C 10% to 40% -25% to +25% -25% to +25% D D --> See step 39 C --> See step 38 B --> See step 37 A --> See step 40
22. CHECK MISFIRE COUNT Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. Allow the engine to idle. Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count. If no misfire counts occur for any of the cylinders, perform the following procedure: Move the shift lever to D. Monitor all of the misfire rate values that are displayed on the Techstream. Result Misfire Count Proceed to No misfire counts, or misfire counts occur randomly in all cylinders A Misfire counts occur in particular cylinder B B --> See step 41 A: Go to next step
23. INSPECT INJECTOR DRIVER (NO. 1 AND NO. 2) Turn the engine switch off. Replace the No. 1 and No. 2 injector drivers with known good ones from another vehicle. NOTE: Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged. Connect the Techstream to the DLC3. Start the engine. Clear DTCs. Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) . Perform the driving test. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending. Read the pending DTCs. Result Result Proceed to DTC P0171, P0172, P0174, P0175, P1170 and/or P117B are output A DTC is not output B B --> See step 42 A: Go to next step
24. INSPECT FUEL RELIEF VALVE ASSEMBLY Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Start the engine. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. Record the Fuel Press value. Turn the engine switch off. Wait for 10 seconds. Turn the engine switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the Techstream. Result Inspection Result Proceed to Fuel Press value drops A Fuel Press value is maintained B A --> See step 43 B --> See step 44
25. CHECK FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) Check the injection volume (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 45 OK --> See step 46
26. 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)
27. 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)
28. REPAIR OR REPLACE PCV HOSE. Refer to «REMOVAL - Step 3»(/lexus/is-f/i-2007-2014/remont/auxiliary-emission-control-systems/#emission-control-service-information)
29. REPAIR OR REPLACE INTAKE SYSTEM. Refer to «ON-VEHICLE INSPECTION - Step 1»(/lexus/is-f/i-2007-2014/remont/mechanical/#intake-inspection)
30. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
31. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
32. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
33. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
34. REPAIR OR REPLACE FUEL PUMP CONTROL CIRCUIT. Refer to «Fuel Pump Control Circuit»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostic-codes-p1604-u0101-circuit-tests)
35. REPLACE FUEL PRESSURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
36. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)
37. REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (BANK 1)). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
38. REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (BANK 2)). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
39. 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)
40. REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
41. REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
42. REPLACE INJECTOR DRIVER (NO. 1 AND NO. 2). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
43. REPLACE FUEL RELIEF VALVE ASSEMBLY. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
44. REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
45. REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION). Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information__removal)
46. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

The fuel pressure sensor is installed on the delivery pipe. The sensor changes fuel pressure to an electrical signal and sends the signal to the ECM. Then the ECM controls the feedback of the pump discharge to maintain the fuel's target pressure between 4 and 13 MPa (40.8 to 132.6 kgf/cm 2 , 580 to 1885 psi). If the sensor output stops, the ECM will stop the fuel pump for high pressure and supply fuel using the low pressure side fuel pump.

Scheme 437

HINT

After confirming DTC P0190, use the Techstream to confirm the fuel pressure in the delivery pipe by entering the following menus: Powertrain / Engine / Data List / Fuel Press.

These DTCs are set if the fuel pressure sensor output voltage is out of the standard range. The DTCs stand for an open or short malfunction of the sensor circuit.

If these DTCs are set, the ECM enters fail safe mode and limits the engine power. Fail safe mode continues until the engine switch is turned off.

P0190

P0192

P0193

Scheme 438

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-diagnostics-introduction__dtc-check-clear) .
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on.
6. Wait 3 seconds or more [A].
7. Start the engine.
8. Idle the engine for 10 seconds [B].
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: P0190, P0192 or P0193.
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's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
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.

Scheme 439

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 440

1. READ VALUE USING TECHSTREAM (FUEL PRESSURE) Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Fuel Press. Read the values. Pressure 3500 to 4500 kPa (35.7 to 45.9 kgf/cm 2 , 508 to 653 psi) Result Fuel Pressure (kPa) Proceed to 19600 or more A 0.0 B OK [4000 to 13000 kPa (40.8 to 132.6 kgf/cm 2 , 580 to 1885 psi)] * C HINT: *: The value must change when the engine is run or stopped. C --> See step 5 B --> See step 3 A: Go to next step
2. INSPECT ECM (VC VOLTAGE) Disconnect the fuel pressure sensor connector. Turn the engine switch on (IG). Measure the voltage between the terminal of the fuel pressure sensor connector. Standard Voltage Tester Connection Switch Condition Specified Condition G19-1 (VC) - G19-3 (E2) Engine switch on (IG) 4.5 to 5.5 V Reconnect the fuel pressure sensor connector. NG --> See step 4 OK: Go to next step
3. INSPECT FUEL PRESSURE SENSOR Inspect the fuel pressure sensor. Refer to «INSPECTION»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information) . NG --> See step 6 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM) Disconnect the fuel pressure sensor connector. Disconnect the ECM connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition G19-1 (VC) - E3-18 (VC) Always Below 1 ohms G19-2 (PR) - E6-27 (PR) Always Below 1 ohms G19-3 (E2) - E3-28 (E2) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition G19-1 (VC) or E3-18 (VC) - Body ground Always 10 kohms or higher G19-2 (PR) or E6-27 (PR) - Body ground Always 10 kohms or higher Reconnect the fuel pressure sensor connector and ECM connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PRESSURE SENSOR - ECM) OK --> See step 7
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 FUEL PRESSURE SENSOR. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/fuel-system/#fuel-service-information)
7. REPLACE ECM. Refer to «REMOVAL»(/lexus/is-f/i-2007-2014/remont/testing-diagnostics/#engine-control-service-information)

See also:
• DTC CHECK / CLEAR
• REMOVAL
• DISASSEMBLY - Step 37
• CHECKING MONITOR STATUS
• DIAGNOSTIC TROUBLE CODE CHART
• CHECK FOR INTERMITTENT PROBLEMS
• PRECAUTION
• WIRING DIAGRAM
• ON-VEHICLE INSPECTION - Step 2
• REMOVAL
• REMOVAL - Step 3
• REMOVAL
• DESCRIPTION
• ON-VEHICLE INSPECTION
• REMOVAL
• DESCRIPTION
• DESCRIPTION
• WIRING DIAGRAM