Engine Control (Sfi) System (Dtcs P0420 - U0101 & Circuit Tests): Other Lexus IS II facelift

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

MONITOR RESULT

Refer to CHECKING MONITOR STATUS. Refer to CHECKING MONITOR STATUS .

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420 AND/OR P0430) Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC output) Proceed to P0420 and/or P0430 A P0420 and/or P0430 and other DTCs B HINT: If any DTCs other than P0420 or P0430 are output, troubleshoot those DTCs first. B --> GO TO DTC CHART A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (A/F CONTROL) Connect Techstream to the DLC3. Start the engine and turn the tester on. Warm up the engine at engine speed of 2500 RPM for approximately 90 seconds. On the tester, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor. Perform the Control the Injection Volume for A/F Sensor operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume.) Monitor the output voltages of the A/F and HO2 sensors (AFS Voltage B1 S1 and O2S B1 S2 or AFS Voltage B2 S1 and O2S B2 S2) displayed on the tester. 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. Tester Display (Sensor) Injection Volume Status Voltage AFS Voltage B1 S1 or AFS B2 S1 (A/F) +25 % Rich Less than 3.1 V AFS Voltage B1 S1 or AFS B2 S1 (A/F) -12.5 % Lean More than 3.4 V O2S B1 S2 or O2S B2 S2 (HO2) +25 % Rich More than 0.55 V O2S B1 S2 or O2S B2 S2 (HO2) -12.5 % Lean Less than 0.4 V Result Status AFS Voltage B1 S1 or AFS Voltage B2 S1 Status O2S B1 S2 or O2S B2 S2 A/F Condition and A/F and HO2 Sensor Conditions Misfire Main Suspected Trouble Areas Proceed to Lean/Rich Lean/Rich Normal - Three-Way Catalytic Converter (TWC) Gas leakage from exhaust system A Lean Lean/Rich A/F sensor malfunction - A/F sensor B Rich Lean/Rich A/F sensor malfunction May occur A/F sensor B Lean/Rich Lean HO2 sensor malfunction - HO2 sensor Gas leakage from exhaust system C Lean/Rich Rich HO2 sensor malfunction - HO2 sensor Gas leakage from exhaust system C Lean Lean Actual air-fuel ratio lean May occur Extremely rich or lean actual air-fuel ratio Gas leakage from exhaust system A Rich Rich Actual air-fuel ratio lean - Extremely rich or lean actual air-fuel ratio Gas leakage from exhaust system A Lean: During Control the Injection Volume for A/F Sensor, the A/F sensor (AFS) output voltage is consistently more than 3.4 V, and the HO2 sensor output voltage (O2S) is consistently less than 0.4 V. Rich: During Control the Injection Volume for A/F Sensor, the AFS is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V. Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the HO2 sensor alternates correctly. C --> CHECK AND REPLACE HEATED OXYGEN SENSOR, AND CHECK AND REPAIR EXHAUST GAS LEAKAGE B --> CHECK AND REPLACE AIR FUEL RATIO SENSOR A: Go to next step
3. CHECK FOR EXHAUST GAS LEAK OK No gas leakage. NG --> REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT OK: Go to next step
4. CHECK DTC OUTPUT (DTC P0420 AND/OR P0430) Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn the tester on. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Display (DTC Output) Proceed to P0420 A P0430 B P0420 and P0430 A and B B --> See step 6 A: Go to next step
5. REPLACE EXHAUST MANIFOLD SUB-ASSEMBLY RH Replace the exhaust manifold sub-assembly RH. Refer to «REMOVAL - Step 72»(ref-387327-S01811944422011022400000) . NEXT --> See step 7
6. REPLACE EXHAUST MANIFOLD SUB-ASSEMBLY LH Replace the exhaust manifold sub-assembly LH. Refer to «REMOVAL - Step 70»(ref-387327-S01811944422011022400000) . NEXT --> See step 7
7. REPLACE FRONT EXHAUST PIPE ASSEMBLY. Refer to «COMPONENTS»(ref-387368-S26262403012011022400000)

1. Key-off monitor sequence 1 to 8 1. ATMOSPHERIC PRESSURE MEASUREMENT Next sequence is run if following condition is met: - Atmospheric pressure change Less than 0.3 kPa (2.25 mmHg) for 1 second 2. FIRST REFERENCE PRESSURE MEASUREMENT Next sequence is run if all of the following conditions are met: Conditions 1, 2 and 3 1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less 2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg) 3. Reference pressure Saturated within 1 minute 3. EVAP CANISTER VENT VALVE CLOSE STUCK CHECK Next sequence is run if following condition is met: - EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more 4. VACUUM INTRODUCTION Next sequence is run if the following condition is met: - EVAP pressure 15 minutes or less 5. EVAP CANISTER PURGE VALVE CLOSE STUCK CHECK Next sequence is run if following condition is met: - EVAP pressure change after purge valve is open 0.3 kPa (2.25 mmHg) or more 6. SECOND REFERENCE PRESSURE MEASUREMENT Next sequence is run if all of following conditions are met: Conditions 1, 2, 3 and 4 1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less 2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg) 3. Reference pressure Saturated within 1 minute 4. Difference between first reference pressure and second reference pressure Less than 0.7 kPa (5.25 mmHg) 7. LEAK CHECK Next sequence is run if following condition is met: - EVAP pressure when vacuum introduction is complete Less than second reference pressure 8. ATMOSPHERIC PRESSURE MEASUREMENT EVAP monitor is complete if the following condition is met: - Atmospheric pressure difference between sequence 1 and 8 0.3 kPa (2.25 mmHg) or less

Refer to CHECKING MONITOR STATUS. Refer to CHECKING MONITOR STATUS .

Key-off monitor

1. Key-off monitor sequence 1 to 8 1. ATMOSPHERIC PRESSURE MEASUREMENT Next sequence is run if following condition is met: - Atmospheric pressure change Less than 0.3 kPa (2.25 mmHg) for 1 second 2. FIRST REFERENCE PRESSURE MEASUREMENT Next sequence is run if all of the following conditions are met: Conditions 1, 2 and 3 1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less 2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg) 3. Reference pressure Saturated within 1 minute 3. EVAP CANISTER VENT VALVE CLOSE STUCK CHECK Next sequence is run if following condition is met: - EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more 4. VACUUM INTRODUCTION Next sequence is run if the following condition is met: - EVAP pressure 15 minutes or less 5. EVAP CANISTER PURGE VALVE CLOSE STUCK CHECK Next sequence is run if following condition is met: - EVAP pressure change after purge valve is open 0.3 kPa (2.25 mmHg) or more 6. SECOND REFERENCE PRESSURE MEASUREMENT Next sequence is run if all of following conditions are met: Conditions 1, 2, 3 and 4 1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less 2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg) 3. Reference pressure Saturated within 1 minute 4. Difference between first reference pressure and second reference pressure Less than 0.7 kPa (5.25 mmHg) 7. LEAK CHECK Next sequence is run if following condition is met: - EVAP pressure when vacuum introduction is complete Less than second reference pressure 8. ATMOSPHERIC PRESSURE MEASUREMENT EVAP monitor is complete if the following condition is met: - Atmospheric pressure difference between sequence 1 and 8 0.3 kPa (2.25 mmHg) or less PURGE FLOW MONITOR Monitor runs whenever following DTCs are not present None Engine Running ECT 4.4°C (40°F) or more IAT 4.4°C (40°F) or more Canister pressure sensor Not detected Purge VSV Not operated by scan tool EVAP system check Not operated by scan tool Battery voltage 10 V or more Purge duty cycle 8 % or more

PURGE VSV STUCK OPEN

PURGE VSV STUCK CLOSED

PURGE FLOW

Refer to CHECKING MONITOR STATUS. Refer to CHECKING MONITOR STATUS .

P0450, P0452 AND P0453

P0451 (NOISE MONITOR)

P0451 (STUCK MONITOR)

P0450: CANISTER PRESSURE SENSOR CHATTERING

P0451: CANISTER PRESSURE SENSOR NOISE

P0451: CANISTER PRESSURE SENSOR STUCK

P0452: CANISTER PRESSURE SENSOR LOW VOLTAGE

P0453: CANISTER PRESSURE SENSOR HIGH VOLTAGE

Scheme 153

1. Key-off monitor sequence 1 to 8 1. ATMOSPHERIC PRESSURE MEASUREMENT Next sequence is run if following condition is met: - Atmospheric pressure change Less than 0.3 kPa (2.25 mmHg) for 1 second 2. FIRST REFERENCE PRESSURE MEASUREMENT Next sequence is run if all of the following conditions are met: Conditions 1, 2 and 3 1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less 2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg) 3. Reference pressure Saturated within 1 minute 3. EVAP CANISTER VENT VALVE CLOSE STUCK CHECK Next sequence is run if following condition is met: - EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more 4. VACUUM INTRODUCTION Next sequence is run if the following condition is met: - EVAP pressure 15 minutes or less 5. EVAP CANISTER PURGE VALVE CLOSE STUCK CHECK Next sequence is run if following condition is met: - EVAP pressure change after purge valve is open 0.3 kPa (2.25 mmHg) or more 6. SECOND REFERENCE PRESSURE MEASUREMENT Next sequence is run if all of following conditions are met: Conditions 1, 2, 3 and 4 1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less 2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg) 3. Reference pressure Saturated within 1 minute 4. Difference between first reference pressure and second reference pressure Less than 0.7 kPa (5.25 mmHg) 7. LEAK CHECK Next sequence is run if following condition is met: - EVAP pressure when vacuum introduction is complete Less than second reference pressure 8. ATMOSPHERIC PRESSURE MEASUREMENT EVAP monitor is complete if the following condition is met: - Atmospheric pressure difference between sequence 1 and 8 0.3 kPa (2.25 mmHg) or less

P0455: EVAP GROSS LEAK

P0456: EVAP SMALL LEAK

Refer to CHECKING MONITOR STATUS. Refer to CHECKING MONITOR STATUS .

M/T

A/T

Scheme 154

The stop light switch remains ON during GO and STOP 5 times.

TYPICAL ENABLING CONDITIONS

Scheme 155

FUNCTIONAL CHECK

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Enter the following the menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC output) Proceed to Only P0505 A P0505 and other DTCs B HINT: If any DTCs other than P0505 are output, troubleshoot those DTCs first. B --> GO TO DTC CHART A: Go to next step
2. CHECK PCV HOSE (HOSE CONNECTION) OK PCV hose is connected correctly and is not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
3. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leakage. OK No leakage from air induction system. NG --> REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step
4. CHECK THROTTLE VALVE Check the throttle valve condition. NG --> REPLACE THROTTLE BODY OK --> REPLACE ECM

P050A

P050A

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Select the following the menu items: Powertrain / Engine and ECT / Trouble Code. Read the DTCs. Result Display (DTC Output) Proceed to P050A A P050A and other DTCs B HINT: If any DTCs other than P050A is output, troubleshoot those DTCs first. B --> See step 16 A: Go to next step
2. READ VALUE USING TECHSTREAM (FUEL TRIM) HINT: Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter. Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Select the following menu items: Powertrain / Engine and ECT / Data List / Short FT #1 and Long FT #1. Read the values displayed on the tester. Add together the Short FT #1 and Long FT #1 values to obtain the total FUEL TRIM. OK Total of Short FT #1 and Long FT #1 values is between -20 % and 20 %. OK --> See step 12 NG: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV) Connect Techstream to the DLC3. Start the engine and turn the tester on. Warm up the engine. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the Oil Control Valve (OCV) using the tester. OK Tester Operations Specified Conditions OCV OFF Normal engine speed OCV ON Engine idles roughly or stalls (soon after OCV switched from OFF to ON) NG --> See step 8 OK: Go to next step
4. CHECK PCV HOSE CONNECTIONS OK PCV hose is connected correctly and is not damaged. NG --> See step 9 OK: Go to next step
5. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leakage. OK No leakage from air induction system. NG --> See step 10 OK: Go to next step
6. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil. OK Air cleaner filter element is not excessively contaminated with dirt or oil. NG --> See step 11 OK: Go to next step
7. REPLACE MASS AIR FLOW METER NEXT --> See step 15
8. CHECK AND REPAIR VVT SYSTEM NEXT --> See step 15
9. REPAIR OR REPLACE PCV HOSE NEXT --> See step 15
10. REPAIR OR REPLACE AIR INDUCTION SYSTEM NEXT --> See step 15
11. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY NEXT --> See step 15
12. CHECK THROTTLE VALVE Check for deposits around the throttle valve and throttle valve condition. OK No deposits around throttle valve and throttle valve moves smoothly. NG --> See step 14 OK: Go to next step
13. REPLACE ECM NEXT --> See step 15
14. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY NEXT --> See step 15
15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data). Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Switch the ECM from normal mode to check mode using the tester. Refer to «CHECK MODE PROCEDURE»(ref-387359-S23762167392011022400000) . Start the engine to idle for a minute. OK Stable fast idling. Read the DTCs. OK No DTC output. NEXT --> END
16. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-387359-S23628788162011022400000)

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Select the following the menu items: Powertrain / Engine and ECT / Trouble Code. Read the DTCs. Result Display (DTC Output) Proceed to P050B A P050B and other DTCs B HINT: If any DTCs other than P050B are output, troubleshoot those DTCs first. B --> See step 16 A: Go to next step
2. READ VALUE USING TECHSTREAM (FUEL TRIM) HINT: Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter. Connect Techstream to the DLC3. Start the engine. Turn the tester on. Select the following menu items: Powertrain / Engine and ECT / Data List / Short FT #1 and Long FT #1. Read the values displayed on the tester at engine idles. Add together the Short FT #1 and Long FT #1 values to obtain the total FUEL TRIM. OK Total of Short FT #1 and Long FT #1 values is between -20 % and 20 %. OK --> See step 12 NG: Go to next step
3. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE OCV) Connect Techstream to the DLC3. Start the engine and turn the tester on. Warm up the engine. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the Oil Control Valve (OCV) using the tester. OK Tester Operation Specified Condition OCV OFF Normal engine speed OCV ON Engine idles roughly or stalls (soon after OCV switched from OFF to ON) NG --> See step 8 OK: Go to next step
4. CHECK PCV HOSE CONNECTIONS OK PCV hose is connected correctly and is not damaged. NG --> See step 9 OK: Go to next step
5. CHECK INTAKE SYSTEM Check the intake system for vacuum leakage. Refer to «ON-VEHICLE INSPECTION»(ref-387366-S26522089122011022400000) . OK No leakage from intake system. NG --> See step 10 OK: Go to next step
6. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil. OK Air cleaner filter element is not excessively contaminated with dirt or oil. NG --> See step 11 OK: Go to next step
7. REPLACE MASS AIR FLOW METER Replace mass air flow meter. Refer to «REMOVAL»(ref-387363-S01991594592011022400000) . NEXT --> See step 15
8. CHECK AND REPAIR VVT SENSOR NEXT --> See step 15
9. REPAIR OR REPLACE PCV HOSE NEXT --> See step 15
10. REPAIR OR REPLACE INTAKE SYSTEM NEXT --> See step 15
11. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY NEXT --> See step 15
12. CHECK THROTTLE VALVE Check for deposits around the throttle valve and throttle valve condition. OK No deposits around throttle valve and throttle valve moves smoothly. NG --> See step 14 OK: Go to next step
13. REPLACE ECM Replace ECM. Refer to «REMOVAL»(ref-387363-S31270846412011022400000) . NEXT --> See step 15
14. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY NEXT --> See step 15
15. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B) NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data). Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Clear the DTCs. Switch the ECM from normal mode to check mode using the tester. Start the engine to idle for a minute. OK Stable fast idling. Read the DTCs. OK No DTC output. NEXT --> END
16. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-387359-S23628788162011022400000)

Scheme 156

1. CHECK DTC Clear DTC. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Turn the engine switch Off. Disconnect the battery negative terminal and wait for 1 minutes. Connect the battery negative terminal. Turn the engine switch Off. Check DTC. OK P0604 is not present. NG --> REPLACE ECM OK --> CHECK FOR INTERMITTENT PROBLEMS

Scheme 157

1. CHECK ANY OTHER DTCS OUTPUT Connect the Techstream to the DLC3. Turn the Engine switch on (IG). Turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output A DTC P0606 is output B B --> See step 3 A: Go to next step
2. INSPECT DTC (P0136, P0137, P0138, P0156, P0157 OR P0158) Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flow chart. HINT: If P0136 or P0156 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(ref-387364-S19081068262011022400000) . Then proceed to "INSPECT ECM". If P0137or P0157 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(ref-387364-S19081068262011022400000) . Then proceed to "INSPECT ECM". If P0138 or P0158 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(ref-387364-S19081068262011022400000) . Then proceed to "INSPECT ECM". If DTC P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or more). NEXT --> See step 6
3. CHECK FOR EXHAUST GAS LEAK Allow the engine to idle and rev the engine. Check for exhaust gas leaks around the heated oxygen sensor. If any exhaust gas leaks are present, repair it and proceed to "PERFORM CONFIRMATION DRIVING PATTERN". If no exhaust gas leaks are present, proceed to "PERFORM CONFIRMATION DRIVING PATTERN". HINT: If no exhaust gas leaks are present, a malfunction in the heated oxygen sensor circuit is suspected. If any exhaust gas leaks are present around the heated oxygen sensor, noise appears in the output voltage of the heated oxygen sensor. NEXT: Go to next step
4. PERFORM CONFIRMATION DRIVING PATTERN Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Connect the Techstream to the DLC3. Warm up the engine until the engine coolant temperature becomes 75° (167°F) or more. Perform the driving pattern. Accelerate the vehicle until 50 mph (80 km/h) and stop the vehicle. Drive the vehicle by 38 to 50 mph (60 to 80 km/h) for 5 minutes or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output A DTC P0606 is output B DTC is not output C C --> See step 6 B --> See step 7 A: Go to next step
5. INSPECT DTC (P0136, P0137, P0138, P0156, P0157 OR P0158) Inspect the P0136, P0137, P0138, P0156, P0157 or P0158 flow chart. HINT: If P0136 or P0156 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(ref-387364-S19081068262011022400000) . Then proceed to "INSPECT ECM". If P0137or P0157 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(ref-387364-S19081068262011022400000) . Then proceed to "INSPECT ECM". If P0138 or P0158 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(ref-387364-S19081068262011022400000) . Then proceed to "INSPECT ECM". If DTC P0606 and P0136, P0137, P0138, P0156, P0157 or P0158 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or more). NEXT: Go to next step
6. INSPECT ECM Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Stop the engine and wait for 30 minutes. Connect the Techstream to the DLC3. Start the engine and allow it to idle for 2 minutes. Turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0606 is output B B --> See step 7 A --> END
7. REPLACE ECM. Refer to «REMOVAL»(ref-387363-S31270846412011022400000)

1. CHECK DTC Clear DTC. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Turn the engine switch Off. Disconnect the battery negative terminal and wait for 1 minute. Connect the battery negative terminal. Turn the engine switch On (IG). Check DTC. OK P0607 is not present. NG --> REPLACE ECM OK --> CHECK FOR INTERMITTENT PROBLEMS

Scheme 158

COMPONENT OPERATING RANGE

1. READ CURRENT DTC Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC Output) Proceed to Only P0630 A P0630 and other DTCs B If any DTCs other than P0630 are output, troubleshoot those DTCs first. NOTE: If P0630 is set, the VIN must be input to the ECM using Techstream. However, all DTCs are cleared automatically by the tester when inputting the VIN. If DTCs other than P0630 are set, check them first. B --> GO TO DTC CHART A: Go to next step
2. INPUT VIN WITH TECHSTREAM NEXT --> END

1. CHECK DTC Clear DTC. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Turn the engine switch Off. Disconnect the battery negative terminal and wait for 1 minute. Connect the battery terminal. Turn the engine switch On (IG) for 10 seconds. Turn the engine switch Off. Turn the engine switch On (IG). Check DTC. OK P0657 is not present. NG --> REPLACE ECM OK --> CHECK FOR INTERMITTENT PROBLEMS

Scheme 159

P2004 (INTAKE MANIFOLD RUNNER CONTROL OPEN STUCK)

P2006 (INTAKE MANIFOLD RUNNER CONTROL CLOSED STUCK)

Scheme 160

ALL

P2009

P2010

P2009

P2010

Scheme 161

1. INSPECT INTAKE MANIFOLD (SCV OPERATION) Inspect the swirl control valve. Refer to «ON-VEHICLE INSPECTION - Step 2»(ref-387366-S22009620572011022400000) . NG --> REPLACE INTAKE MANIFOLD OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (ECM - SCV) Disconnect the E6 ECM connector. Disconnect the E53 DC motor for SCV connector. Measure the resistance according to the value(s) in the table below. Standard resistance (Check for open) Tester Connection Specified Condition IA1- (E6-1) - E53-2 Below 1 ohms IA1+ (E6-2) - E53-1 Below 1 ohms Standard resistance (Check for short) Tester Connection Specified Condition IA1- (E6-1) or E53-2 - Body ground 10 kohms or higher IA1+ (E6-2) or E53-1 - body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the DC motor for SCV connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P2009 OR P2010) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Clear DTCs. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC Output) Proceed to P2009 or P2010 A No DTC B B --> CHECK FOR INTERMITTENT PROBLEMS A --> REPLACE ECM

P2014

P2016

P2017

Scheme 162

ALL

P2102

P2103

P2102

P2103

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, is set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

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

Scheme 163

ALL

P2111 (THROTTLE ACTUATOR STUCK OPEN)

P2112 (THROTTLE ACTUATOR STUCK CLOSED)

P2111 (THROTTLE ACTUATOR STUCK OPEN)

P2112 (THROTTLE ACTUATOR STUCK CLOSED)

When either of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, is set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2111 or P2112) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC Output) Proceed to P2111 or P2112 A P2111 or P2112 and other DTCs B HINT: If any DTCs other than P2111 or P2112 are output, troubleshoot those DTCs first. B --> GO TO DTC CHART A: Go to next step
2. INSPECT THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE) Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body. And check that the throttle valve moves smoothly. OK Throttle valve is not contaminated with foreign objects and moves smoothly. NG --> REPLACE THROTTLE BODY OK: Go to next step
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P2111 OR P2112) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Start the engine, and fully depress and release the accelerator pedal quickly (to fully open and close the throttle valve). Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC Output) Proceed to No DTC A P2111 or P2112 B B --> REPLACE ECM A --> CHECK FOR INTERMITTENT PROBLEMS

When this DTC, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, is set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

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

Scheme 164

When this DTC, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, is set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° throttle angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2119) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC Output) Proceed to P2119 A P2119 and other DTCs B HINT: If any DTCs other than P2119 are output, troubleshoot those DTCs first. B --> GO TO DTC CHART A: Go to next step
2. CHECK WHETHER DTC OUTPUT RECURS (DTC P2119) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Allow the engine to idle for 15 seconds. WARNING: Exercise extreme care and take precautions at Procedure "A" and Procedure "B" below. Failure to do so may result in the vehicle unexpectedly rolling away. Securely apply the parking brake and move the gear selector lever to the D position. (Procedure "A") While depressing the brake pedal securely, fully depress the accelerator pedal for 5 seconds. (Procedure "B") On the tester, enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. HINT: The output voltage of the throttle position sensor can be checked during Procedure "B" using Techstream. Variations in the output voltage indicate that the throttle actuator is in operation. To check the output voltage using Techstream, enter the following menus: Powertrain / Engine and ECT / Data List / Throttle Position No. 1. OK No DTC output. NG --> REPLACE THROTTLE BODY OK --> END

P2120

P2122

P2123

P2125

P2127

P2128

P2138

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

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

Scheme 165

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

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

1. READ VALUE USING TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2. Read the values displayed on the tester. Standard voltage Accelerator Pedal Operations Accel Sensor Out No. 1 Accel Sensor Out No. 2 Released 0.5 to 1.1 V 1.2 to 2.0 V Depressed 2.6 to 4.5 V 3.4 to 5.0 V OK --> See step 3 NG: Go to next step
2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) Disconnect the A26 Accelerator Pedal Position (APP) sensor connector. Disconnect the A6 ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance (Check for open) Tester Connection Specified Condition VPA (A26-6) - VPA (A6-33) Below 1 ohms EPA (A26-5) - EPA (A6-34) Below 1 ohms VCPA (A26-4) - VCPA (A6-35) Below 1 ohms VPA2 (A26-3) - VPA2 (A6-32) Below 1 ohms EPA2 (A26-2) - EPA2 (A6-26) Below 1 ohms VCP2 (A26-1) - VCP2 (A6-27) Below 1 ohms Standard resistance (Check for short) Tester Connection Specified Condition VPA (A26-6) or VPA (A6-33) - body ground 10 kohms or higher EPA (A26-5) or EPA (A6-34) - body ground 10 kohms or higher VCPA (A26-4) or VCPA (A6-35) - body ground 10 kohms or higher VPA2 (A26-3) or VPA2 (A6-32) - body ground 10 kohms or higher EPA2 (A26-2) or EPA2 (A6-26) - body ground 10 kohms or higher VCP2 (A26-1) or VCP2 (A6-27) - body ground 10 kohms or higher Reconnect the APP sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY NEXT: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) Connect Techstream to the DLC3. Turn the engine switch on (IG) and turn the tester on. Clear DTCs. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Start the engine. Allow the engine to idle for 15 seconds. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC Output) Proceed to P2121 A No output B B --> END A --> REPLACE ECM

ALL

SENSOR VOLTAGE DETECTION MONITOR

SENSOR CURRENT DETECTION MONITOR

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

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

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

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

Refer to CHECKING MONITOR STATUS. Refer to CHECKING MONITOR STATUS .

Scheme 166

CONFIRMATION DRIVING PATTERN

This confirmation driving pattern is used in steps 2, 4, 7, 17 and 21 of the following diagnostic troubleshooting procedure when using Techstream.

Scheme 167

Scheme 168

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the tester on.
4. Clear DTCs.
5. Start the engine, and warm it up until the ECT reaches 75°C (167°F) or higher (Procedure "A").
6. On Techstream, enter the following menus to check the fuel-cut status: Powertrain / Engine and ECT / Data List / Idle Fuel Cut.
7. Drive the vehicle at between 38 mph (60 km/h) and 75 mph (120 km/h) for at least 10 minutes (Procedure "B").
8. Change the transmission to the 2nd gear (Procedure "C").
9. Drive the vehicle at a proper vehicle speed to perform fuel-cut operation (refer to the following HINT ) (Procedure "D"). HINT: Fuel-cut is performed when the following conditions are met: Accelerator pedal fully released. Engine speed is 2500 RPM or more (fuel injection returns at 1000 RPM).
10. Accelerate the vehicle to 40 RPM (64 km/h) or more by depressing the accelerator pedal for at least 10 seconds (Procedure "E").
11. Soon after performing procedure E above, release the accelerator pedal for at least 4 seconds without depressing the brake pedal, in order to execute fuel-cut control (Procedure "F").
12. Allow the vehicle to decelerate until the vehicle speed declines to less than 6 mph (10 km/h).
13. Repeat procedure from C through F above at least 3 times in one driving cycle. HINT: Completion of all A/F sensor monitors is required to change the value in TEST RESULT. WARNING: Strictly observe posted speed limits, traffic laws, and road conditions when performing these drive patterns.

ALL

A/F SENSOR OPEN CIRCUIT BETWEEN A1A+ AND A1A-/A2A+ AND A2A

A/F SENSOR LOW IMPEDANCE

OTHER

P2237 AND P2240 (OPEN CIRCUIT BETWEEN A1A+ AND A1A-/A2A+ AND A2A

P2238 AND P2241 (LOW IMPEDANCE)

P2238 AND P2241 (SHORT CIRCUIT BETWEEN A1A+ AND GND/A2A+ AND GND)

P2238 AND P2241 (SHORT CIRCUIT BETWEEN A1A+ AND A1A-/A2A+ AND A2A

P2239 AND P2242 (SHORT CIRCUIT BETWEEN A1A+ AND +B/A2A+ AND +B)

P2252 AND P2255 (SHORT CIRCUIT BETWEEN A1A- AND GND/A2A- AND GND)

P2253 AND P2256 (SHORT CIRCUIT BETWEEN A1A- AND +B/A2A- AND +B)

1. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) See step 12 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. REPLACE AIR FUEL RATIO SENSOR Replace A/F sensor. Refer to «REMOVAL»(ref-387339-S07660990752011022400000) . NEXT: Go to next step
3. CHECK WHETHER DTC OUTPUT RECURS Connect Techstream to the DLC3. Turn the engine switch On (IG) and turn the tester ON. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Start the engine. Allow the engine to idle for 5 minutes or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read pending DTCs. Result Display (DTC Output) Proceed to No output A P2237, P2238, P2239, P2252 or P2253 B B --> REPLACE ECM A --> END

1. Key-off monitor sequence 1 to 8 1. ATMOSPHERIC PRESSURE MEASUREMENT Next sequence is run if following condition is met: - Atmospheric pressure change Less than 0.3 kPa (2.25 mmHg) for 1 second 2. FIRST REFERENCE PRESSURE MEASUREMENT Next sequence is run if all of the following conditions are met: Conditions 1, 2 and 3 1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less 2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg) 3. Reference pressure Saturated within 1 minute 3. EVAP CANISTER VENT VALVE CLOSE STUCK CHECK Next sequence is run if following condition is met: - EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more 4. VACUUM INTRODUCTION Next sequence is run if the following condition is met: - EVAP pressure 15 minutes or less 5. EVAP CANISTER PURGE VALVE CLOSE STUCK CHECK Next sequence is run if following condition is met: - EVAP pressure change after purge valve is open 0.3 kPa (2.25 mmHg) or more 6. SECOND REFERENCE PRESSURE MEASUREMENT Next sequence is run if all of following conditions are met: Conditions 1, 2, 3 and 4 1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less 2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg) 3. Reference pressure Saturated within 1 minute 4. Difference between first reference pressure and second reference pressure Less than 0.7 kPa (5.25 mmHg) 7. LEAK CHECK Next sequence is run if following condition is met: - EVAP pressure when vacuum introduction is complete Less than second reference pressure 8. ATMOSPHERIC PRESSURE MEASUREMENT EVAP monitor is complete if the following condition is met: - Atmospheric pressure difference between sequence 1 and 8 0.3 kPa (2.25 mmHg) or less

Detailed information on CHECKING MONITOR STATUS. Refer to CHECKING MONITOR STATUS .

ALL

CASE 1

CASE 2

CASE 3

CASE 1

CASE 2

CASE 3

1. REPLACE ECM NEXT: Go to next step
2. CHECK WHETHER DTC OUTPUT RECURS Connect Techstream to the DLC3. Turn the engine switch on (IG). Clear DTCs. Refer to «DTC CHECK / CLEAR»(ref-387359-S19593904092011022400000) . Start the engine and wait for 10 minutes or more. On the tester, enter the following menu items: Powertrain / Engine and ECT / Trouble Codes / Pending. If no pending DTC is displayed, the repair has been successfully completed. NEXT --> END

HINT

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

Scheme 169

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the tester on.
4. Clear DTCs (where set).
5. Select the following menu items: Powertrain / Engine and ECT / Monitor / O2 Sensor / Details.
6. Check that RES RATE B1S1 is Fail.
7. Start the engine and warm it up (Procedure "A").
8. Drive the vehicle at between 25 mph and 75 mph (40 km/h and 120 km/h) for 3 minutes. However, the vehicle should be driven at a constant speed (Procedure "B").
9. Check the monitor result values on Techstream by selecting the following menu items: Powertrain / Engine and ECT / Monitor / O2 Sensor / Details / RES RATE B1 S1 and RES RATE B2 S1.
10. If the values indicated on the tester do not change, perform READINESS MONITOR DRIVE PATTERN for the A/F sensor and the heated oxygen sensor. Refer to «READINESS MONITOR DRIVE PATTERN»(ref-387359-S36751423922011022400000) . HINT: Completion of all A/F sensor monitors is required to change the value in Test Results.
11. Note the value of the Monitor Result.
12. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes / Pending.
13. Check if any DTCs (any pending DTCs) are set.

Refer to CHECKING MONITOR STATUS. Refer to CHECKING MONITOR STATUS .

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00 AND/OR P2A03) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC Output) Proceed to P2A00 and/or P2A03 A P2A00 and/or P2A03 and other DTCs B HINT: If any DTCs other than P2A00 or P2A03 are output, troubleshoot those DTCs first. B --> GO TO DTC CHART A: Go to next step
2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Disconnect the E42 or E38 A/F 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 HA1A (1) - +B (2) 20°C (68°F) 1.8 to 3.4 ohms HA1A (1) - A1A- (4) - 10 kohms or higher Standard resistance (Bank 2 sensor 1) Tester Connection Condition Specified Condition HA2A (1) - +B (2) 20°C (68°F) 1.8 to 3.4 ohms HA2A (1) - A2A- (4) - 10 kohms or higher Reconnect the A/F sensor connector. NG --> REPLACE AIR FUEL RATIO SENSOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) Disconnect the E42 or E38 A/F sensor connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Specified Condition +B (E42-2) - Body ground 9 to 14 V +B (E38-2) - Body ground 9 to 14 V Turn the engine switch off. Disconnect the E6 ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance (Check for open) Tester Connection Specified Condition HA1A (E42-1) - HA1A (E6-6) Below 1 ohms A1A+ (E42-3) - A1A+ (E6-18) Below 1 ohms A1A- (E42-4) - A1A- (E6-17) Below 1 ohms HA2A (E38-1) - HA2A (E6-4) Below 1 ohms A2A+ (E38-3) - A2A+ (E6-28) Below 1 ohms A2A- (E38-4) - A2A- (E6-27) Below 1 ohms Standard resistance (Check for short) Tester Connection Specified Condition HA1A (E42-1) or HA1A (E6-6) - Body ground 10 kohms or higher A1A+ (E42-3) or A1A+ (E6-18) - Body ground 10 kohms or higher A1A- (E42-4) or A1A- (E6-17) - Body ground 10 kohms or higher HA2A (E38-1) or HA2A (E6-4) - Body ground 10 kohms or higher A2A+ (E38-3) or A2A+ (E6-28) - Body ground 10 kohms or higher A2A- (E38-4) or A2A- (E6-27) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the A/F sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. PERFORM CONFIRMATION DRIVING PATTERN NEXT: Go to next step
5. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03) Read DTCs using Techstream. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Result Display (DTC Output) Proceed to P2A00 and/or P2A03 A No output B B --> REPLACE ECM A: Go to next step
6. REPLACE AIR FUEL RATIO SENSOR NEXT: Go to next step
7. PERFORM CONFIRMATION DRIVING PATTERN NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00 AND/OR P2A03) Read DTCs using Techstream. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Result Display (DTC Output) Proceed to No output A P2A00 and/or P2A03 B B --> REPLACE ECM A --> END

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0101) Connect Techstream to the DLC3. Turn the engine switch on (IG). Turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read DTCs. Result Display (DTC output) Proceed to U0101 A U0101 and other DTCs B B --> GO TO DTC CHART A --> REPLACE ECM

RELATED DTCS

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

Scheme 170

Note. If the 0.02 inch reference pressure difference between the first and second checks is greater than the specification, the DTCs corresponding to the reference pressure (P043E, P043F, P0441, P0455, P0456, P2401 and P2420) will all be stored.

Scheme 171

Scheme 172

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

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

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

Scheme 173

Scheme 174

Scheme 175

1. Key-off monitor This monitor checks for Evaporative Emission (EVAP) system leaks and pump module malfunctions. The monitor starts 5 hours* after the engine switch is turned off. More than 5 hours are required to allow the fuel to cool down to stabilize the Fuel Tank Pressure (FTP), thus making the EVAP system monitor more accurate. The electric vacuum pump creates negative pressure (vacuum) in the EVAP system and the pressure is measured. Finally, the ECM monitors for leaks from the EVAP system and malfunctions in both the pump module and EVAP VSV, based on the EVAP pressure. HINT: *: If the engine coolant temperature is not below 35°C 5 hours after the engine switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C 7 hours after the engine switch is turned off, the monitor check starts 2.5 hours later.
2. Purge flow monitor The purge flow monitor consists of the two monitors. The 1st monitor is conducted every time and the 2nd monitor is conducted if necessary. The 1st monitor While the engine is running and the purge Vacuum Switching Valve (VSV) is ON (open), the ECM monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd monitor. The 2nd monitor The vent valve turned OFF (open) and the EVAP pressure is then measured. If the variation in the pressure is less than 0.5 kPa (3.75 mmHg), the ECM interprets this as the EVAP VSV being stuck closed, and illuminates the MIL and sets DTC P0441 (2 trip detection logic). Atmospheric pressure check: In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ECM. Component Operation Canister Contains activated charcoal to absorb EVAP generated in fuel tank. Cut-off valve Located in fuel tank. Valve floats and closes when fuel tank 100% full. EVAP VSV (Vacuum Switching Valve) Opens or closes line between canister and intake manifold. ECM uses EVAP VSV to control EVAP purge flow. In order to discharge EVAP absorbed by canister to intake manifold, ECM opens EVAP VSV. EVAP discharge volume to intake manifold controlled by EVAP VSV duty cycle ratio (current-carrying time) (open: ON, close: OFF). Refueling valve Controls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, spring and restrictor (diameter: 0.08 inch). When fuel vapor and pressure inside fuel tank increase, valve opens. While EVAP purged, valve closes and restrictor prevents a large amount of vacuum from affecting pressure in fuel tank. Valve opens while refueling. Roll-over valve Located in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out. Soak timer Built into ECM. To ensure accurate EVAP monitor, measures 5 hours (+-15 min) after engine switch off. This allows fuel to cool down, stabilizing Fuel Tank Pressure (FTP). When approximately 5 hours elapsed, ECM activates. Pump module Consists of (a) to (d) below. Pump module cannot be disassembled. (a) Vent valve Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When, ECM turns valve OFF, EVAP system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing EVAP VSV, turning vent valve ON (closed) and operating vacuum pump see scheme 84 (b) Pressure sensor Indicates pressure as voltage. ECM supplies regulated 5 V to pressure sensor, and uses feedback from sensor to monitor EVAP system pressure see scheme 85 (c) Vacuum pump Creates negative pressure (vacuum) in EVAP system for leak check. (d) 0.02 inch orifice Has opening with 0.02 inch diameter. Vacuum produced through orifice by closing EVAP VSV, turning vent valve OFF and operating vacuum pump, to monitor 0.02 inch leak pressure. 0.02 inch leak pressure indicates small leak of EVAP.

HINT

After a repair, check Monitor Status by performing the key-off monitor confirmation and purge flow monitor confirmation described below.

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

Detailed information (. Refer to CHECKING MONITOR STATUS ).

The test value and test limit information are described as shown in the chart below. The following information is included under Monitor Result in the emissions-related DTC procedures

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

EVAP

*: Pressures A to G are indicated as shown in the following diagram.

Scheme 176