Engine Control (Diagnostic Codes (P011B-P0339): Diagnosis

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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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Scheme 214: PROCEDURE

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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 / ETCS / 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 VC 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 E2 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) VTA1 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 VTA1 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 VTA1 + 1.11 V VTA1: Throttle Position No. 1 VTA2: Throttle position No. 2 If DTC P0121 is output, proceed ti the "CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)". B --> See step 5 A: Go to next step
CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) Disconnect the throttle with motor 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 D28-5 (VC) - D1-80 (VCTA) Always Below 1 ohms D28-6 (VTA) - D1-78 (VTA1) Always Below 1 ohms D28-4 (VTA2) - D1-77 (VTA2) Always Below 1 ohms D28-3 (E2) - D1-79 (ETA) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D28-5 (VC) or D1-80 (VCTA) - Body ground Always 10 kohms or higher D28-6 (VTA) or D1-78 (VTA1) - Body ground Always 10 kohms or higher D28-4 (VTA2) or D1-77 (VTA2) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Throttle Position Sensor) *2 Front view of wire harness connector (to ECM) Reconnect the ECM connector. Reconnect the throttle with motor body assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE POSITION SENSOR - ECM) OK: Go to next step
INSPECT ECM (VC VOLTAGE) Disconnect the throttle with motor 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 D28-5 (VC) - D28-3 (E2) Engine switch on (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Throttle Position Sensor) Reconnect the throttle with motor body assembly connector. NG --> See step 6 OK: Go to next step
REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Replace the throttle with motor body assembly. Refer to «REMOVAL»(ref-400788-S10183594902011051800000) . NEXT: Go to next step
CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-400784-S05337578742011051800000) . 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, P0121, P0122, P0123, P0220, P0222, P0223, and/or P2135 are output A DTC is not output B B --> END A --> See step 6
REPLACE ECM. Refer to «REMOVAL»(ref-400788-S26250166532011051800000)

HINT

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.
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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

HINT

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.
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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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.

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Scheme 216: INSPECTION PROCEDURE

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Scheme 218

Connect the Techstream to the DLC3.
Start the engine.
Turn the Techstream on.
Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Techstream 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 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 Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich) 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. 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. 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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. If the OX1B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 will be set. If the OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0156 will be set.

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Scheme 219: PROCEDURE

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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
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 more A Less than 1.0 V B B --> See step 5 A: Go to next step
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 Tester Connection Condition Specified Condition 1 (+B) - 3 (E2) Always 10 kohms or higher 1 (+B) - 4 (OX1B) Always 10 kohms or higher 2 (+B) - 4 (E2) Always 10 kohms or higher 2 (+B) - 3 (OX2B) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Heated Oxygen Sensor) *2 Bank 1 *3 Bank 2 Reconnect the heated oxygen sensor connector. NG --> See step 22 OK: Go to next step
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT) Turn the engine switch off and wait for 5 minutes. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D1-45 (HT1B) - D1-114 (OX1B) Always 10 kohms or higher D1-44 (HT2B) - D1-112 (OX2B) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to ECM) Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM) OK --> See step 23
PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME) Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Warm up the engine. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor. Change the fuel injection volume using the Techstream, and monitoring 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. Result Techstream Display (Sensor) Voltage Variation Proceed to AFS Voltage B1S1 (Air fuel ratio) AFS Voltage B2S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK AFS Voltage B1S1 (Air fuel ratio) AFS Voltage B2S1 (Air fuel ratio) Remains at more than 3.3 V NG AFS Voltage B1S1 (Air fuel ratio) AFS Voltage B2S1 (Air fuel ratio) 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
CHECK 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 38 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 shown Incomplete again, add the vehicle speed and use the second gear to decelerate the vehicle. NG --> See step 15 OK --> See step 12
READ VALUE USING TECHSTREAM (O2S B1S2 OR O2S B2S2) 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 speed 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
PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME) Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Warm up the engine. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor. Change the fuel injection volume using the Techstream, and monitoring 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. Result Techstream Display (Sensor) Voltage Variation Proceed to AFS Voltage B1S1 (Air fuel ratio) AFS Voltage B2S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK AFS Voltage B1S1 (Air fuel ratio) AFS Voltage B2S1 (Air fuel ratio) Remains at more than 3.3 V NG AFS Voltage B1S1 (Air fuel ratio) AFS Voltage B2S1 (Air fuel ratio) 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
INSPECT FOR EXHAUST GAS LEAK Inspect 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
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 Tester Connection Condition Specified Condition 2 (HT1B) - 1 (+B) 20°C (68°F) 11 to 16 ohms 2 (HT1B) - 3 (E2) Always 10 kohms or higher 1 (HT2B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT2B) - 4 (E2) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Heated Oxygen Sensor) *2 Bank 1 *3 Bank 2 Reconnect the heated oxygen sensor connector. NG --> See step 25 OK: Go to next step
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) Tester Connection Condition Specified Condition S1-2 (HT1B) - D1-45 (HT1B) Always Below 1 ohms S1-4 (OX1B) - D1-114 (OX1B) Always Below 1 ohms S1-3 (E2) - D1-115 (EX1B) Always Below 1 ohms D36-1 (HT2B) - D1-44 (HT2B) Always Below 1 ohms D36-3 (OX2B) - D1-112 (OX2B) Always Below 1 ohms D36-4 (E2) - D1-113 (EX2B) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition S1-2 (HT1B) or D1-45 (HT1B) - Body ground Always 10 kohms or higher S1-4 (OX1B) or D1-114 (OX1B) - Body ground Always 10 kohms or higher D36-1 (HT2B) or D1-44 (HT2B) - Body ground Always 10 kohms or higher D36-3 (OX2B) or D1-112 (OX2B) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Heated Oxygen Sensor) *2 Front view of wire harness connector (to ECM) *3 Bank 1 *4 Bank 2 Reconnect the heated oxygen sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM) OK: Go to next step
REPLACE HEATED OXYGEN SENSOR Replace the heated oxygen sensor. Refer to «REMOVAL»(ref-400788-S32649933272011051800000) . NEXT: Go to next step
PERFORM CONFIRMATION DRIVING PATTERN Refer to «CONFIRMATION DRIVING PATTERN»(ref-400797-S39230584912011051800000) the confirmation driving pattern for P0136, P0137, P0138, P0156, P0157 and P0158. NEXT: Go to next step
CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138, P0156, P0157 OR P0158) Connect the Techstream to the DLC3. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input 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, P00137, P0138, P0156, P0157 or P0158 is output) B B --> See step 26 A --> END
REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(ref-400788-S16324759872011051800000) . NEXT: Go to next step
PERFORM CONFIRMATION DRIVING PATTERN Refer to «CONFIRMATION DRIVING PATTERN»(ref-400797-S39230584912011051800000) the confirmation driving pattern for P0136, P0137, P0138, P0156, P0157 and P0158. NEXT: Go to next step
CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0138, P0158 OR P0158) Connect the Techstream to the DLC3. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Utility / All Readiness. Input DTC: P0136, P0138, P0156 or P0158. Check the DTC judgment result. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0136, P0138, P0156 or P0158 is output) B B --> See step 25 A --> END
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 more A Less than 1.0 V B B --> See step 21 A: Go to next step
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 Tester Connection Condition Specified Condition 1 (+B) - 3 (E2) Always 10 kohms or higher 1 (+B) - 4 (OX1B) Always 10 kohms or higher 2 (+B) - 4 (E2) Always 10 kohms or higher 2 (+B) - 3 (OX2B) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Heated Oxygen Sensor) *2 Bank 1 *3 Bank 2 Reconnect the heated oxygen sensor connector. NG --> See step 25 OK: Go to next step
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT) Turn the engine switch off and wait for 5 minutes. Disconnect the ECM connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D1-45 (HT1B) - D1-114 (OX1B) Always 10 kohms or higher D1-44 (HT2B) - D1-112 (OX2B) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to ECM) Reconnect the ECM connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM) OK --> See step 23
READ DTC OUTPUT (DTC P0139 OR P0159 IS OUTPUT AGAIN) Connect the Techstream to the DLC3. Clear the DTCs. Start the engine. [A] Warm up the engine until the engine coolant temperature reaches 75°C (167°F) or more. [B] Drive the vehicle 38 mph (60 km/h) and decelerate the vehicle for 7 seconds or more. [C] Turn the Techstream ON. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. [D] Input DTCs: P0139 or P0159. Check the DTC monitor is NORMAL. If DTC monitor is INCOMPLETE, perform the drive pattern adding the vehicle speed and using the second gear to decelerate the vehicle. Result Result Proceed to ABNORMAL (DTC P0139 and/or P0159 are output) A NORMAL (DTC is not output) B B --> See step 27 A --> See step 25
REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(ref-400788-S32649933272011051800000)
REPLACE ECM. Refer to «REMOVAL»(ref-400788-S26250166532011051800000)
CHECK AND REPLACE EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (FUEL INJECTOR, FUEL PRESSURE, GAS LEAK FROM SYSTEM, ETC.). 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)»(ref-400797-S33056097222011051800000)
REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(ref-400788-S32649933272011051800000)
REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(ref-400788-S16324759872011051800000)
CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-400784-S03039419332011051800000)

HINT

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

Connect the Techstream to the DLC3.
Start the engine.
Turn the Techstream on.
Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Techstream 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 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 Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich) 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. 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. 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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. If the OX1B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 will be set. If the OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0156 will be set.

HINT

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor 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.

Connect the Techstream to the DLC3.
Start the engine.
Turn the Techstream on.
Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Techstream 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 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 Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich) 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. 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. 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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. 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. 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 226

Scheme 226: PROCEDURE

Scheme 227

Scheme 228

Scheme 229

Scheme 230

Scheme 231

Scheme 232

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171, P0172, P0174 OR P0175) 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 P0171, P0172, P0174 and/or P0175 are output A DTC P0171, P0172, P0174 or P0175 and other DTCs are output B HINT: If any DTCs other than P0171, P0172, P0174 or P0175 are output, troubleshoot those DTCs first. B --> See step 20 A: Go to next step
CHECK PCV HOSE (HOSE CONNECTIONS) Check the PCV hose connections. Refer to «ON-VEHICLE INSPECTION»(ref-400794-S35833604912011051800000) . OK PCV hose is connected correctly and is not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(ref-400792-S33062746192011051800000) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
PERFORM ACTIVE TEST USING TECHSTREAM (AIR FUEL RATIO CONTROL) Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor. Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream. HINT: 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. Techstream 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 Fuel injector assembly blockage 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 - Fuel injector assembly leakage or blockage 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 the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V. Rich: During the Control the Injection Volume for A/F Sensor Active Test, the AFS Voltage is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V. Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output voltage of the heated oxygen sensor alternates correctly. B --> See step 11 A: Go to next step
READ VALUE USING TECHSTREAM (COOLANT TEMP) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp. Read the Data List twice, when the engine is both cold and warmed up. Standard With cold engine Same as ambient air temperature. With warm engine Between 75°C and 95°C (167°F and 203°F) NG --> See step 21 OK: Go to next step
INSPECT MASS AIR FLOW METER SUB-ASSEMBLY Inspect the mass air flow meter sub-assembly. Refer to «ON-VEHICLE INSPECTION»(ref-400788-S20585533102011051800000) . NG --> See step 22 OK: Go to next step
CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(ref-400801-S28367752752011051800000) . NG --> REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step
INSPECT FOR EXHAUST GAS LEAK Inspect 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
CHECK IGNITION SYSTEM Check the ignition system. Refer to «ON-VEHICLE INSPECTION»(ref-400789-S41507480852011051800000) . NG --> REPAIR OR REPLACE IGNITION SYSTEM OK: Go to next step
INSPECT FUEL INJECTOR ASSEMBLY (INJECTION VOLUME) Inspect the fuel injector assembly. Refer to «INSPECTION»(ref-400791-S21918100082011051800000) . NG --> See step 23 OK: Go to next step
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 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 1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA2A) - 4 (A2A-) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Air Fuel Ratio Sensor) *2 Bank 1 *3 Bank 2 Reconnect the air fuel ratio sensor connector. NG --> See step 24 OK: Go to next step
CHECK TERMINAL VOLTAGE (+B TERMINAL 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 Tester Connection Switch Condition Specified Condition D20-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V D19-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Air Fuel Ratio Sensor) *2 Bank 1 *3 Bank 2 Reconnect the air fuel ratio sensor connector. NG --> See step 16 OK: Go to next step
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 D20-1 (HA1A) - D1-22 (HA1A) Always Below 1 ohms D20-3 (A1A+) - D1-126 (A1A+) Always Below 1 ohms D20-4 (A1A-) - D1-125 (A1A-) Always Below 1 ohms D19-1 (HA2A) - D1-20 (HA2A) Always Below 1 ohms D19-3 (A2A+) - D1-103 (A2A+) Always Below 1 ohms D19-4 (A2A-) - D1-102 (A2A-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D20-1 (HA1A) or D1-22 (HA1A) - Body ground Always 10 kohms or higher D20-3 (A1A+) or D1-126 (A1A+) - Body ground Always 10 kohms or higher D20-4 (A1A-) or D1-125 (A1A-) - Body ground Always 10 kohms or higher D19-1 (HA2A) or D1-20 (HA2A) - Body ground Always 10 kohms or higher D19-3 (A2A+) or D1-103 (A2A+) - Body ground Always 10 kohms or higher D19-4 (A2A-) or D1-102 (A2A-) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Air Fuel Ratio Sensor) *2 Front view of wire harness connector (to ECM) *3 Bank 1 *4 Bank 2 Reconnect the ECM connector. Reconnect the air fuel ratio sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM) OK: Go to next step
REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(ref-400788-S16324759872011051800000) . NEXT: Go to next step
PERFORM CONFIRMATION DRIVING PATTERN Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-400784-S05337578742011051800000) . Turn the engine switch off. 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: P0171, P0172, P0174 or P0175. Check the DTC judgment result. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0171, P0172, P0174 or P0175 is output) B B --> See step 25 A --> END
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Disconnect the air fuel ratio sensor connector. Remove the engine room junction block assembly. Disconnect the engine room junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D20-2 (+B) - 3C-2 (Engine room junction block assembly) Always Below 1 ohms D19-2 (+B) - 3C-2 (Engine room junction block assembly) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D20-2 (+B) or 3C-2 (Engine room junction block assembly) - Body ground Always 10 kohms or higher D19-2 (+B) or 3C-2 (Engine room junction block assembly) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Air Fuel Ratio Sensor) *2 Bank 1 *3 Bank 2 *4 Engine Room Junction Block Assembly *5 Front view of wire harness connector (to Engine Room Junction Block Assembly) - - Reconnect the engine room junction block assembly connector. Reinstall the engine room junction block assembly. Reconnect the air fuel ratio sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ENGINE ROOM JUNCTION BLOCK ASSEMBLY) OK: Go to next step
CHECK TERMINAL VOLTAGE (ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Remove the engine room junction block assembly. Disconnect the engine room junction block assembly connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 3A-1 (Engine room junction block assembly) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Engine Room Junction Block Assembly *2 Front view of wire harness connector (to Engine Room Junction Block Assembly) Reconnect the engine room junction block assembly connector. Reinstall the engine room junction block assembly. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - BATTERY) OK: Go to next step
CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - EFI MAIN RELAY) Remove the engine room junction block assembly. Disconnect the engine room junction block assembly connector. Remove the EFI MAIN relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition 3C-7 (Engine room junction block assembly) - EFI MAIN relay terminal 3 Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 3C-7 (Engine room junction block assembly) or EFI MAIN relay terminal 3 - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Engine Room Junction Block Assembly *2 Front view of wire harness connector (to Engine Room Junction Block Assembly) *3 Engine Room Relay Block - - Reinstall the EFI MAIN relay. Reconnect the engine room junction block assembly connector. Reinstall the engine room junction block assembly. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - EFI MAIN RELAY) OK: Go to next step
CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - BODY GROUND) Remove the engine room junction block assembly. Disconnect the engine room junction block assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition 3C-17 (Engine room junction block assembly) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Junction Block Assembly *2 Front view of wire harness connector (to Engine Room Junction Block Assembly) Reconnect the engine room junction block assembly connector. Reinstall the engine room junction block assembly. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - BODY GROUND) OK --> REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY
GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400784-S08158320572011051800000)
REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(ref-400788-S05975438782011051800000)
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(ref-400788-S28114056922011051800000)
REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(ref-400791-S26062819322011051800000)
REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(ref-400788-S16324759872011051800000)
REPLACE ECM. Refer to «REMOVAL»(ref-400788-S26250166532011051800000)

HINT

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

Connect the Techstream to the DLC3.
Start the engine.
Turn the Techstream on.
Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Techstream 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 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 Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich) 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. 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. 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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. 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. 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.

HINT

This troubleshooting procedure is based on the premise that the engine can start. If the engine cannot start, proceed to Problem Symptoms Table. Refer to PROBLEM SYMPTOMS TABLE .

Scheme 233

Scheme 233: PROCEDURE

Scheme 234

Scheme 235

INSPECT F/PMP RELAY Remove the F/PMP relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 4 No battery voltage applied to terminals 1 and 2 Below 1 ohms 3 - 4 Battery voltage applied to terminals 1 and 2 10 kohms or higher 3 - 5 No battery voltage applied to terminals 1 and 2 10 kohms or higher 3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 ohms Reinstall the F/PMP relay. NG --> REPLACE F/PMP RELAY OK: Go to next step
CHECK TERMINAL VOLTAGE (F/PMP RELAY) Remove the F/PMP relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F/PMP relay terminal 2 - Body ground Cranking 11 to 14 V F/PMP relay terminal 2 - Body ground Engine switch on (IG) 0 to 3 V TEXT IN ILLUSTRATION *1 Engine Room Relay Block Reinstall the F/PMP relay. NG --> See step 5 OK: Go to next step
CHECK HARNESS AND CONNECTOR (F/PMP RELAY - ECM) Remove the F/PMP relay from the engine room relay block. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition F/PMP relay terminal 1 - A43-48 (FPR) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition F/PMP relay terminal 1 or A43-48 (FPR) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Engine Room Relay Block *2 Front view of wire harness connector (to ECM) Reconnect the ECM connector. Reinstall the F/PMP relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - ECM) OK --> See step 4
REPLACE ECM. Refer to «REMOVAL»(ref-400788-S26250166532011051800000)
CHECK FUEL PUMP CONTROL CIRCUIT. Refer to «Fuel Pump Control Circuit»(ref-400785-S19834121042011051800000)

HINT

This troubleshooting procedure is based on the premise that the engine can start. If the engine cannot start, proceed to Problem Symptoms Table. Refer to PROBLEM SYMPTOMS TABLE .

HINT

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem: There was insufficient fuel volume in the tank. Improper fuel is used. The spark plugs have been contaminated.
After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #6 Misfire Count).
Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after finishing repairs.
For 6 cylinder engine, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine speed. If misfires occur only in high engine speed areas, only DTC P0300 is set. In the event of DTC P0300 being present, perform the following operations: Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-400784-S05337578742011051800000) . Start the engine and conduct the confirmation driving pattern. Read the misfiring rates of each cylinder or DTC(s) using the Techstream. Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.
When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be Rich (-20% or less) or Lean (+20% or more).
When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfires have occurred only while the engine is being warmed up.
An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs detection.

Scheme 236

Scheme 236: PROCEDURE

Scheme 237

Scheme 238

Scheme 239

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 are output A DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 and other DTCs are output B HINT: If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 are output, troubleshoot those DTCs first. B --> See step 34 A: Go to next step
READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Misfire RPM and Misfire Load. Read and note the Misfire RPM and Misfire Load values. HINT: The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred. NEXT: Go to next step
CHECK PCV HOSE (HOSE CONNECTIONS) Check the PCV hose connections. Refer to «ON-VEHICLE INSPECTION»(ref-400794-S35833604912011051800000) . OK PCV hose is connected correctly and is not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
READ VALUE USING TECHSTREAM (CATALYST OT MF F/C) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Catalyst OT MF F/C. Read the value displayed on the Techstream. Result Data List Techstream Display Proceed to Catalyst OT MF F/C Avail A Not Avl B B --> See step 6 A: Go to next step
PERFORM ACTIVE TEST USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Active Test / Prohibit the Catalyst OT Misfire prevent F/C. Perform the Active Test. NOTE: When performing the Active Test, make sure that the vehicle is stopped and either idling or being revved within 3000 rpm. NEXT: Go to next step
READ VALUE USING TECHSTREAM (CYLINDER #1 (TO #6) MISFIRE COUNT) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on (Step "A"). Enter the following menus: Powertrain / Engine / Data List / Cylinder #1 (to #6) Misfire Count (Step "B"). Read each value for Cylinder #1 (to #6) Misfire Count displayed on the Techstream. If no misfire counts occur in any cylinders, perform the following procedure: Start the engine and let it idle. Move the shift lever to D. Check the Cylinder #1 (to #6) Misfire Count. If misfire counts are still not displayed, perform steps ("A") and ("B"). Drive the vehicle while satisfying the Misfire RPM and Misfire Load values noted in the "Read Value Using Techstream (Misfire RPM and Misfire Load)" procedure above. Read Cylinder #1 (to #6) Misfire Count or the DTCs displayed on the Techstream. Result Misfire Count Proceed to Most misfires occur in only 1 or 2 cylinders A 3 cylinders or more have equal misfire counts B HINT: If it is difficult to reproduce misfires for each cylinder, check the Data List item called Misfire Margin. Try to find vehicle driving conditions that lower the Misfire Margin value. Values above 30% are considered normal. If the Coolant Temp value of the freeze frame data is below 75°C (167°F), the misfire may be detected only when the engine is cold. If Engine Run Time value of the freeze frame data is below 120 seconds, the misfire may be detected immediately after the engine is started. B --> See step 19 A: Go to next step
CHECK SPARK PLUG Remove the ignition coil assembly and the spark plug of the misfiring cylinder. Measure the spark plug electrode gap. Maximum gap 1.4 mm (0.0551 in.) Check the electrode for carbon deposits. RECOMMENDED SPARK PLUG Manufacturer Product DENSO FK20HR11 NOTE: If the electrode gap is larger than the maximum, replace the spark plug. Do not adjust the electrode gap. Reinstall the ignition coil assembly and the spark plug. NG --> See step 35 OK: Go to next step
CHECK FOR SPARK AND IGNITION (SPARK TEST) Perform a spark test. WARNING: During the test, disconnect all fuel injector assembly connectors. NOTE: Do not crank the engine for more than 2 seconds. Remove the ignition coil assembly from the cylinder head. Install the spark plug onto the ignition coil assembly. Disconnect the 6 fuel injector assembly connectors. Touch the spark plug to the cylinder head. Crank the engine for less than 2 seconds and check for spark. OK Spark jumps across electrode gap. Reconnect the 6 fuel injector assembly connectors. Reinstall the ignition coil assembly. NG --> See step 31 OK: Go to next step
CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER Measure the cylinder compression pressure of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 11»(ref-400790-S09063834542011051800000) . NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION OK: Go to next step
CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE) Disconnect the fuel injector assembly connectors. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D13-2 - Body ground Engine switch on (IG) 11 to 14 V D14-2 - Body ground Engine switch on (IG) 11 to 14 V D15-2 - Body ground Engine switch on (IG) 11 to 14 V D16-2 - Body ground Engine switch on (IG) 11 to 14 V D17-2 - Body ground Engine switch on (IG) 11 to 14 V D18-2 - Body ground Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Fuel Injector Assembly) Reconnect the fuel injector assembly connectors. NG --> See step 36 OK: Go to next step
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) Disconnect the fuel injector assembly connectors. 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 D13-1 - D1-86 (#10) Always Below 1 ohms D14-1 - D1-109 (#20) Always Below 1 ohms D15-1 - D1-85 (#30) Always Below 1 ohms D16-1 - D1-108 (#40) Always Below 1 ohms D17-1 - D1-84 (#50) Always Below 1 ohms D18-1 - D1-107 (#60) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D13-1 or D1-86 (#10) - Body ground Always 10 kohms or higher D14-1 or D1-109 (#20) - Body ground Always 10 kohms or higher D15-1 or D1-85 (#30) - Body ground Always 10 kohms or higher D16-1 or D1-108 (#40) - Body ground Always 10 kohms or higher D17-1 or D1-84 (#50) - Body ground Always 10 kohms or higher D18-1 or D1-107 (#60) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Fuel Injector Assembly) *2 Front view of wire harness connector (to ECM) Reconnect the fuel injector assembly connectors. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) OK: Go to next step
INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50 AND/OR #60 VOLTAGE) Disconnect the ECM connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D1-86 (#10) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-109 (#20) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-85 (#30) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-108 (#40) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-84 (#50) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-107 (#60) - D1-43 (E01) Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to ECM) Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND) OK: Go to next step
CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor). Refer to «INSPECTION»(ref-400791-S21918100082011051800000) . NG --> See step 37 OK: Go to next step
INSPECT INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(ref-400792-S33062746192011051800000) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(ref-400801-S28367752752011051800000) . NG --> See step 33 OK: Go to next step
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 Coolant Temp twice, when the engine is both cold and warmed up. Standard With cold engine Same as ambient temperature. With warm engine Between 75°C and 95°C (167°F and 203°F). NG --> See step 38 OK: Go to next step
INSPECT MASS AIR FLOW METER SUB-ASSEMBLY HINT: Inspect the mass air flow meter sub-assembly. Refer to «ON-VEHICLE INSPECTION»(ref-400788-S20585533102011051800000) . NG --> See step 39 OK: Go to next step
CHECK VALVE TIMING HINT: Check the valve timing. Refer to «PROCEDURE - Step 5»(ref-400796-S29522626982011051800000) . NG --> See step 40 OK --> See step 41
CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(ref-400792-S33062746192011051800000) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(ref-400801-S28367752752011051800000) . NG --> See step 33 OK: Go to next step
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 Coolant Temp twice, when the engine is both cold and warmed up. Standard With cold engine Same as ambient air temperature. With warm engine Between 75°C and 95°C (167°F and 203°F). NG --> See step 38 OK: Go to next step
INSPECT MASS AIR FLOW METER SUB-ASSEMBLY HINT: Inspect the mass air flow meter sub-assembly. Refer to «ON-VEHICLE INSPECTION»(ref-400788-S20585533102011051800000) . NG --> See step 39 OK: Go to next step
CHECK VALVE TIMING HINT: Check the valve timing. Refer to «PROCEDURE - Step 5»(ref-400796-S29522626982011051800000) . NG --> See step 40 OK: Go to next step
CHECK SPARK PLUG Remove the ignition coil assembly and the spark plug of the misfiring cylinder. Measure the spark plug electrode gap. Maximum gap 1.4 mm (0.0551 in.) Check the electrode for carbon deposits. RECOMMENDED SPARK PLUG Manufacturer Product DENSO FK20HR11 NOTE: If the electrode gap is larger than the maximum, replace the spark plug. Do not adjust the electrode gap. Reinstall the ignition coil assembly and the spark plug. NG --> See step 35 OK: Go to next step
CHECK FOR SPARK AND IGNITION (SPARK TEST) Perform a spark test. WARNING: During the test, disconnect all fuel injector assembly connectors. NOTE: Do not crank the engine for more than 2 seconds. Remove the ignition coil assembly from the cylinder head. Install the spark plug onto the ignition coil assembly. Disconnect the 6 fuel injector assembly connectors. Touch the spark plug to the cylinder head. Crank the engine for less than 2 seconds and check for spark. OK Spark jumps across electrode gap. Reconnect the 6 fuel injector assembly connectors. Reinstall the ignition coil assembly. NG --> See step 31 OK: Go to next step
CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER Measure the cylinder compression pressure of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 11»(ref-400790-S09063834542011051800000) . NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION OK: Go to next step
CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE) Disconnect the fuel injector assembly connectors. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D13-2 - Body ground Engine switch on (IG) 11 to 14 V D14-2 - Body ground Engine switch on (IG) 11 to 14 V D15-2 - Body ground Engine switch on (IG) 11 to 14 V D16-2 - Body ground Engine switch on (IG) 11 to 14 V D17-2 - Body ground Engine switch on (IG) 11 to 14 V D18-2 - Body ground Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Fuel Injector Assembly) Reconnect the fuel injector assembly connectors. NG --> See step 36 OK: Go to next step
CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) Disconnect the fuel injector assembly connectors. 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 D13-1 - D1-86 (#10) Always Below 1 ohms D14-1 - D1-109 (#20) Always Below 1 ohms D15-1 - D1-85 (#30) Always Below 1 ohms D16-1 - D1-108 (#40) Always Below 1 ohms D17-1 - D1-84 (#50) Always Below 1 ohms D18-1 - D1-107 (#60) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D13-1 or D1-86 (#10) - Body ground Always 10 kohms or higher D14-1 or D1-109 (#20) - Body ground Always 10 kohms or higher D15-1 or D1-85 (#30) - Body ground Always 10 kohms or higher D16-1 or D1-108 (#40) - Body ground Always 10 kohms or higher D17-1 or D1-84 (#50) - Body ground Always 10 kohms or higher D18-1 or D1-107 (#60) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Fuel Injector Assembly) *2 Front view of wire harness connector (to ECM) Reconnect the fuel injector assembly connectors. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) OK: Go to next step
INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50 AND/OR #60 VOLTAGE) Disconnect the ECM connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D1-86 (#10) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-109 (#20) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-85 (#30) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-108 (#40) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-84 (#50) - D1-43 (E01) Engine switch on (IG) 11 to 14 V D1-107 (#60) - D1-43 (E01) Engine switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to ECM) Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND) OK: Go to next step
CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor). Refer to «INSPECTION»(ref-400791-S21918100082011051800000) . NG --> See step 42 OK --> See step 41
CHANGE TO KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Change the installed spark plug to a known good spark plug. Perform a spark test. WARNING: During the test, disconnect all fuel injector assembly connectors. NOTE: Do not crank the engine for more than 2 seconds. Remove the ignition coil assembly from the cylinder head. Install the spark plug onto the ignition coil assembly. Disconnect the 6 fuel injector assembly connectors. Touch the spark plug to the cylinder head. Crank the engine for less than 2 seconds and check for spark. OK Spark jumps across electrode gap. Reconnect the 6 fuel injector assembly connectors. Reinstall the ignition coil assembly. NG --> See step 32 OK --> See step 35
CHANGE TO KNOWN GOOD IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER Change the installed ignition coil assembly to a known good ignition coil assembly. Perform a spark test. WARNING: During the test, disconnect all fuel injector assembly connectors. NOTE: Do not crank the engine for more than 2 seconds. Remove the ignition coil assembly from the cylinder head. Install the spark plug onto the ignition coil assembly. Disconnect the 6 fuel injector assembly connectors. Touch the spark plug to the cylinder head. Crank the engine for less than 2 seconds and check for spark. OK Spark jumps across electrode gap. Reconnect the 6 fuel injector assembly connectors. Reinstall the ignition coil assembly. NG --> See step 41 OK --> See step 43
CHECK FUEL LINE Check the fuel lines for leaks or blockage. NG --> REPAIR OR REPLACE FUEL LINE OK --> See step 44
GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-400784-S08158320572011051800000)
REPLACE SPARK PLUG. Refer to «REMOVAL»(ref-400788-S00842969802011051800000)
CHECK FUEL INJECTOR CIRCUIT. Refer to «Fuel Injector Circuit»(ref-400785-S14955327652011051800000)
REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(ref-400791-S26062819322011051800000)
REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(ref-400788-S05975438782011051800000)
REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(ref-400788-S28114056922011051800000)
ADJUST VALVE TIMING. Refer to «DISASSEMBLY»(ref-400790-S25477138842011051800000)
REPLACE ECM. Refer to «REMOVAL»(ref-400788-S26250166532011051800000)
REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(ref-400791-S26062819322011051800000)
REPLACE IGNITION COIL ASSEMBLY. Refer to «REMOVAL»(ref-400788-S00842969802011051800000)
REPLACE FUEL PUMP. Refer to «REMOVAL»(ref-400791-S26326872392011051800000)

HINT

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem: There was insufficient fuel volume in the tank. Improper fuel is used. The spark plugs have been contaminated.
After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #6 Misfire Count).
Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after finishing repairs.
For 6 cylinder engine, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine speed. If misfires occur only in high engine speed areas, only DTC P0300 is set. In the event of DTC P0300 being present, perform the following operations: Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-400784-S02158227972011051800000) . Start the engine and conduct the confirmation driving pattern. Read the misfiring rates of each cylinder or DTC(s) using the Techstream. Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.
When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be Rich (-20% or less) or Lean (+20% or more).
When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfires have occurred only while the engine is being warmed up.
An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs detection.

HINT

DTCs P0327 and P0328 are for the bank 1 knock control sensor circuit.
DTCs P0332 and P0333 are for the bank 2 knock control sensor circuit.
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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 240

Scheme 240: PROCEDURE

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INSPECT ECM (KNK1, KNK2 VOLTAGE) Disconnect the knock control sensor connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition b2-1 - b2-2 Engine switch on (IG) 4.5 to 5.5 V b1-1 - b1-2 Engine switch on (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Knock Control Sensor) *2 Bank 1 *3 Bank 2 Reconnect the knock control sensor connector. NG --> See step 3 OK: Go to next step
INSPECT KNOCK CONTROL SENSOR Remove the knock control sensor. 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) 120 to 280 kohms TEXT IN ILLUSTRATION *1 Component without harness connected (Knock Control Sensor) *2 Ohmmeter Reinstall the knock control sensor. NG --> See step 4 OK --> See step 5
CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM) Disconnect the knock control 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 b2-2 - D1-94 (KNK1) Always Below 1 ohms b2-1 - D1-93 (EKNK) Always Below 1 ohms b1-2 - D1-117 (KNK2) Always Below 1 ohms b1-1 - D1-116 (EKN2) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition b2-2 or D1-94 (KNK1) - Body ground Always 10 kohms or higher b2-1 or D1-93 (EKNK) - Body ground Always 10 kohms or higher b1-2 or D1-117 (KNK2) - Body ground Always 10 kohms or higher b1-1 or D1-116 (EKN2) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Knock Control Sensor) *2 Front view of wire harness connector (to ECM) *3 Bank 1 *4 Bank 2 Reconnect the knock control sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (KNOCK CONTROL SENSOR - ECM) OK --> See step 5
REPLACE KNOCK CONTROL SENSOR. Refer to «REMOVAL»(ref-400788-S11205975022011051800000)
REPLACE ECM. Refer to «REMOVAL»(ref-400788-S26250166532011051800000)

HINT

DTCs P0327 and P0328 are for the bank 1 knock control sensor circuit.
DTCs P0332 and P0333 are for the bank 2 knock control sensor circuit.
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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

HINT

If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
Check the engine speed. The engine speed can be checked using the Techstream. Follow the procedure below: Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Engine Speed. The engine speed may be indicated as zero despite the engine rotating normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.
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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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Scheme 243: PROCEDURE

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READ VALUE USING TECHSTREAM (ENGINE SPEED) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Engine Speed. Start the engine. Read the values displayed on the Techstream while the engine is running. Standard Correct values are displayed. HINT: To check the engine speed change, display the graph on the Techstream. If the engine does not start, check the engine speed while cranking. If the engine speed indicated on the Techstream remains zero (0), there may be an open or short in the crankshaft position sensor circuit. NG --> See step 2 OK --> See step 6
INSPECT CRANKSHAFT POSITION SENSOR Disconnect the crankshaft position sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 Cold 1630 to 2740 ohms 1 - 2 Hot 2065 to 3225 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Crankshaft Position Sensor) NOTE: Terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F). Reconnect the crankshaft position sensor connector. NG --> See step 7 OK: Go to next step
CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Disconnect the crankshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D21-1 (NE+) - D1-110 (NE+) Always Below 1 ohms D21-2 (NE-) - D1-111 (NE-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D21-1 (NE+) or D1-110 (NE+) - Body ground Always 10 kohms or higher D21-2 (NE-) or D1-111 (NE-) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Crankshaft Position Sensor) *2 Front view of wire harness connector (to ECM) Reconnect the ECM connector. Reconnect the crankshaft position sensor connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) OK: Go to next step
CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR) Check the crankshaft position sensor installation condition. OK Sensor is installed correctly. NG --> See step 8 OK: Go to next step
CHECK CRANKSHAFT (TEETH OF CRANK ANGLE SENSOR PLATE) Check the teeth of the crank angle sensor plate. OK Crank angle sensor plate does not have any cracks or deformation. NG --> See step 9 OK --> See step 10
CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-400784-S03039419332011051800000)
REPLACE CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(ref-400788-S01358840712011051800000)
SECURELY REINSTALL CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(ref-400788-S01358840712011051800000)
REPLACE CRANKSHAFT. Refer to «DISASSEMBLY»(ref-400790-S25514228512011051800000)
REPLACE ECM. Refer to «REMOVAL»(ref-400788-S26250166532011051800000)

HINT

If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
Check the engine speed. The engine speed can be checked using the Techstream. Follow the procedure below: Connect the Techstream to the DLC3. Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / Engine Speed. The engine speed may be indicated as zero despite the engine rotating normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.
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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Engine Control (Diagnostic Codes (P011B-P0339): Diagnosis Lexus RX III

INSPECTION PROCEDURE

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