Engine Control System [diagnostic Codes] Toyota Prius V I

DESCRIPTION

The VVT (variable valve timing) system adjusts the intake valve timing to improve driveability. The engine oil pressure turns the camshaft timing gear assembly to adjust the valve timing.

The camshaft timing oil control valve assembly is a solenoid valve and switches the engine oil line. The valve moves when the ECM applies the 12 V to the solenoid. The ECM changes the energizing time to the solenoid (duty-cycle) in accordance with the camshaft position, crankshaft position, throttle position, etc.

Scheme 112

MONITOR DESCRIPTION

This DTC is designed to detect open or short circuits in the camshaft timing oil control valve assembly circuit. If the camshaft timing oil control valve duty-cycle is excessively high or low while the power switch on (IG), the ECM will illuminate the MIL and store the DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Wait 5 seconds.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0010.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 113

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.

PROCEDURE

1. READ OUTPUT DTC (DTC P0010) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTC after recording the freeze frame data and DTC. Turn the power switch off and wait for 30 seconds. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and allow the engine to idle. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0010 is output A DTC is not output B B --> See step 6 A: Go to next step
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Inspect the camshaft timing oil control valve assembly. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information__inspection) . NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY - ECM) Disconnect the camshaft timing oil control valve assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D25-1 (+) - D28-36 (OC1+) Always Below 1 ohms D25-2 (-) - D28-59 (OC1-) Always Below 1 ohms D25-1 (+) or D28-36 (OC1+) - Body ground Always 10 kohms or higher D25-2 (-) or D28-59 (OC1-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 4
4. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
5. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information__removal)
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)

Refer to DTC P0010. Refer to DESCRIPTION .

The ECM optimizes the intake valve timing using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, the camshaft timing oil control valve assembly and the camshaft timing gear assembly. The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve assembly. This control signal regulates the oil pressure supplied to the camshaft timing gear assembly. The camshaft timing gear assembly can advance or retard the intake camshaft.

If the difference between the target and actual intake valve timing is large, and changes in the actual intake valve timing are small, the ECM interprets this as a camshaft timing gear assembly stuck malfunction and stores a DTC.

1. Example
2. A DTC is stored when the following conditions "A" and "B" are met: It takes 5 seconds or more to change the valve timing by 5°CA (Condition "A"). After the above condition is met, the camshaft timing oil control valve is forcibly activated for 10 seconds (Condition "B").
3. DTC P0011 (Advanced Cam Timing) is subject to 1 trip detection logic.
4. DTC P0012 (Retarded Cam Timing) is subject to 2 trip detection logic.
5. These DTCs indicate that the camshaft timing gear assembly cannot operate properly due to camshaft timing oil control valve assembly malfunctions or the presence of foreign objects in the camshaft timing oil control valve assembly.

P0011: ADVANCED CAMSHAFT TIMING

P0012: RETARDED CAMSHAFT TIMING

1. If the difference between the target and actual camshaft timing is greater than the specified value, the ECM operates the VVT actuator for 10 seconds by applying and releasing oil pressure. Then, the ECM monitors the camshaft timing change for 10 seconds.

MONITOR RESULT

Refer to detailed information in Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

P0011, P0012: EXHAUST GAS RECIRCULATION/VVT / IN VVT STUCK B1

Scheme 114

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: P0011 is output: Clear the DTC without using the Techstream. P0012 is output: Clear the DTC with using the Techstream.
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
8. Accelerate the vehicle to 60 km/h (37 mph) or more by depressing the accelerator pedal for at least 10 seconds [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the engine stops, further depress the accelerator pedal to restart the engine.
9. Idle the engine for 30 seconds or more [D].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
11. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P0011 or P0012.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [F] through [H].
15. Accelerate the vehicle to 60 km/h (37 mph) or more by depressing the accelerator pedal for at least 10 seconds [F]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
16. Idle the engine for 30 seconds or more [G].
17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
18. Input the DTC: P0011 or P0012.
19. Check the DTC judgment result again [H]. HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
20. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0010. Refer to WIRING DIAGRAM .

HINT

1. DTC P0011 or P0012 may be stored when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain stored even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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 115

Scheme 116

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011 OR P0012) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0011 or P0012 is output A DTC P0011 or P0012 and other DTCs are output B HINT: If any DTCs other than P0011 or P0012 are output, troubleshoot those DTCs first. B --> See step 10 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Linear (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream. OK Techstream Operation Specified Condition 0% Normal engine speed 100% Engine idles roughly or stalls HINT: If the result is not acceptable, cool the engine (engine coolant temperature is 50°C (122°F) or less) and perform the Active Test again. Test not possible with park (P) selected during charge control. Move shift lever to N to perform test. NG --> See step 5 OK: Go to next step
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0011 OR P0012) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: P0011 is output: Clear the DTC without using the Techstream. P0012 is output: Clear the DTC with using the Techstream. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC is not output A DTC P0011 or P0012 is output B HINT: DTC P0011 or P0012 may be stored when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain stored even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. B --> See step 8 A --> See step 4
4. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Inspect the camshaft timing oil control valve assembly. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information__inspection) . NG --> See step 11 OK: Go to next step
6. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY Inspect the camshaft timing gear assembly. Refer to «DISASSEMBLY - Step 31»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> See step 13 OK: Go to next step
7. INSPECT OIL CONTROL VALVE FILTER Remove the oil control valve filter. Refer to «DISASSEMBLY - Step 41»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information) . Check that the filter is not clogged. OK Filter is not clogged. NG --> See step 12 OK: Go to next step
8. ADJUST VALVE TIMING HINT: There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to match-up the alignment marks. Refer to «REASSEMBLY»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information) . TEXT IN ILLUSTRATION *a Top *b Alignment Mark *c No. 1 Cylinder at TDC Compression NEXT: Go to next step
9. CHECK WHETHER DTC OUTPUT RECURS (DTC P0011 OR P0012) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: P0011 is output: Clear the DTC without using the Techstream. P0012 is output: Clear the DTC with using the Techstream. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC is not output A DTC P0011 or P0012 is output B B --> See step 14 A --> END
10. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
11. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information__removal)
12. REPLACE OIL CONTROL VALVE FILTER. Refer to «DISASSEMBLY - Step 41»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information)
13. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY. Refer to «DISASSEMBLY - Step 32»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information)
14. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

The ECM optimizes the valve timing by using the VVT (Variable Valve Timing) system to control the intake camshaft. The VVT system includes the ECM, the camshaft timing oil control valve assembly and the camshaft timing gear assembly. The ECM sends a target duty-cycle control signal to the camshaft timing oil control valve assembly.

This control signal regulates the oil pressure supplied to the camshaft timing gear assembly. The camshaft timing gear assembly can advance or retard the intake camshaft.

To monitor the correlation of the intake camshaft position and crankshaft position, the ECM checks the VVT learning value while the engine is idling. The VVT learning value is calibrated based on the camshaft position and crankshaft position. The intake valve timing is set to the most retarded angle while the engine is idling. If the VVT learning value is out of specified range in consecutive driving cycles, the ECM illuminates the MIL and stores the DTC P0016.

Scheme 117

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
8. Idle the engine for 5 minutes or more [C].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0016.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [E] through [G].
14. Drive the vehicle at 60 km/h (37 mph) for 2 to 3 minutes [E]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
15. Idle the engine for 5 minutes or more [F].
16. Check the DTC judgment result [G]. HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
17. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. DTC P0016 may be stored when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain stored even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.
2. Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when malfunctions are detected. 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.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0016) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0016 is output A DTC P0016 and other DTCs are output B HINT: If any DTCs other than P0016 are output, troubleshoot those DTCs first. B --> See step 10 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR) See step 2 NG --> See step 5 OK: Go to next step
3. CHECK WHETHER DTC OUTPUT RECURS (DTC P0016) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC is not output A DTC P0016 is output B HINT: DTC P0016 may be stored when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain stored even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. B --> See step 8 A --> See step 4
4. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Inspect the camshaft timing oil control valve assembly. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information__inspection) . NG --> See step 11 OK: Go to next step
6. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY Inspect the camshaft timing gear assembly. Refer to «DISASSEMBLY - Step 31»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> See step 12 OK: Go to next step
7. INSPECT OIL CONTROL VALVE FILTER See step 7 NG --> See step 13 OK: Go to next step
8. ADJUST VALVE TIMING See step 8 NEXT: Go to next step
9. CHECK WHETHER DTC OUTPUT RECURS (DTC P0016) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC is not output A DTC P0016 is output B B --> See step 14 A --> END
10. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
11. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information__removal)
12. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY. Refer to «DISASSEMBLY - Step 32»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information)
13. REPLACE OIL CONTROL VALVE FILTER. Refer to «DISASSEMBLY - Step 41»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information)
14. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

Refer to DTC P2195. Refer to DESCRIPTION .

HINT

Scheme 118

1. When either of these DTCs is stored, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor heater in fail-safe mode. Fail-safe mode continues until the power switch is turned off.
2. Although the DTC titles say the oxygen sensor, these DTCs relate to the air fuel ratio sensor.
3. Sensor 1 refers to the sensor mounted in front of the Three-way catalytic converter and located near the engine assembly.
4. The ECM uses pulse width modulation to adjust the current through the heater. The air fuel ratio sensor heater circuit uses a relay on the +B side of the circuit.

The ECM uses information from the air fuel ratio sensor to regulate the air fuel ratio and keep it close to the stoichiometric level. This maximizes the ability of the three-way catalytic converter to purify the exhaust gases.

The air fuel ratio sensor detects oxygen levels in the exhaust gas and transmits the information to the ECM. The inner surface of the sensor element is exposed to the outside air. The outer surface of the sensor element is exposed to the exhaust gas. The sensor element is made of platinum coated zirconia and includes an integrated heating element.

The zirconia element generates a small voltage when there is a large difference in the oxygen concentrations between the exhaust gas and outside air. The platinum coating amplifies this voltage generation.

The air fuel ratio sensor is more efficient when heated. When the exhaust gas temperature is low, the sensor cannot generate useful voltage signals without supplementary heating. The ECM regulates the supplementary heating using a duty-cycle approach to adjust the average current in the sensor heater element. If the heater current is outside the normal range, the signal transmitted by the air fuel ratio sensor becomes inaccurate, as a result, the ECM is unable to regulate air fuel ratio properly.

When the current in the air fuel ratio sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.

ALL

P0031

P0032

P101D

P0031

P0032

P101D

P0031

P0032

P101D

Scheme 119

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and idle it for 5 minutes or more [B].
8. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 2500 RPM for 1 minute [C]. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, perform steps [C] and [D] after charging control has completed.
9. Idle the engine for 5 minutes or more [D].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
11. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P0031, P0032 or P101D.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.
15. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P2195. Refer to WIRING DIAGRAM .

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

HINT

1. Refer to "Data List / Active Test" [A/F Heater Duty #1]. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) .
2. Sensor 1 refers to the sensor closest to the engine assembly.
3. Sensor 2 refers to the sensor farthest away from the engine assembly.
4. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
5. Change the fuel injection volume using the Control the Injection Volume function provided in the Active Test and monitor the air fuel ratio sensor output voltage. Refer to «INSPECTION PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes) . If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Scheme 120

1. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Inspect the air fuel ratio sensor. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NG --> See step 5 OK: Go to next step
2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR) Disconnect the air fuel ratio sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D24-2 (+B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Air Fuel Ratio Sensor (Sensor 1)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - EFI MAIN RELAY) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) Disconnect the air fuel ratio sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D24-1 (HA1A) - D28-18 (HA1A) Always Below 1 ohms D24-1 (HA1A) or D28-18 (HA1A) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0031, P0032 OR P101D) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P0031, P0032 or P101D is output B B --> See step 6 A --> See step 7
5. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)

Refer to DTC P0136. Refer to DESCRIPTION .

HINT

Scheme 121

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

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

Heated Oxygen Sensor Heater Range Check (P0037, P0038 and P102D)

1. The ECM monitors the current applied to the heated oxygen sensor heater to check the heater for malfunctions. If the heater current is outside the normal range, the signal transmitted by the heated oxygen sensor becomes inaccurate. When the current in the heated oxygen sensor heater is outside the normal operating range, the ECM interprets this as a malfunction in the sensor heater and stores a DTC.

Heated Oxygen Sensor Heater Performance (P0141)

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

ALL

P0037 (CASE 1)

P0037 (CASE 2)

P0038

P0141

P102D

HINT

When the values for the Data List items O2 Heater Curr Val B1S2 is not 0 A, the heater is on.

P0037 (CASE 1)

P0037 (CASE 2)

P0038

P0141

P102D

Refer to detailed information in Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

P0141: O2 SENSOR HEATER / O2 HEATER B1S2

Scheme 122

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and idle it for 5 minutes or more [B].
8. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of 2500 RPM for 1 minute [C]. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, perform steps [C] and [D] after charging control has completed.
9. Idle the engine for 5 minutes or more [D].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
11. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P0037, P0038, P0141 or P102D.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform step [B] through [E] again.
15. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0136. Refer to WIRING DIAGRAM .

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

HINT

1. Refer to "Data List / Active Test" [O2 Heater B1S2, O2 Heater Curr Val B1S2]. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) .
2. Sensor 1 refers to the sensor closest to the engine assembly.
3. Sensor 2 refers to the sensor farthest away from the engine assembly.
4. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
5. Change the fuel injection volume using the Control the Injection Volume function provided in the Active Test and monitor the heated oxygen sensor output voltage. Refer to «INSPECTION PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes) . If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Scheme 123

1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Inspect the heated oxygen sensor. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NG --> See step 5 OK: Go to next step
2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF HEATED OXYGEN SENSOR) Disconnect the heated oxygen sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D9-2 (+B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of harness connector (to Heated Oxygen Sensor (Sensor 2)) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - EFI MAIN RELAY) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the heated oxygen sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D9-1 (HT1B) - D28-41 (HT1B) Always Below 1 ohms D9-1 (HT1B) or D28-41 (HT1B) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0037, P0038, P0141 OR P102D) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC is not output A DTC P0037, P0038, P0141 or P102D is output B B --> See step 6 A --> See step 7
5. REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)

Refer to DTC P0102. Refer to DESCRIPTION .

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

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

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

Refer to DTC P0102. Refer to WIRING DIAGRAM .

Scheme 124

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
5. Turn the power switch off and wait for 30 seconds.
6. Turn the power switch on (IG) and turn the Techstream on.
7. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
8. Start the engine and warm it up until the engine coolant temperature reaches 70°C (158°F) or higher [A].
9. Drive the vehicle at approximately 80 km/h (50 mph) to 112 km/h (70 mph) for 5 minutes or more [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: Drive while keeping the engine load as stable as possible.
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
11. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P0101.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.
15. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0101 is output A DTC P0101 and other DTCs are output B HINT: If any DTCs other than P0101 are output, troubleshoot those DTCs first. B --> See step 8 A: Go to next step
2. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-intake-system-inspection) . OK No leaks from the intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
3. CHECK PCV HOSE CONNECTIONS Check the PCV hose connections. Refer to «COMPONENTS»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . OK PCV valve and hose are connected correctly and are not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. Result Result Proceed to Outside of standard range A Within standard range B B --> See step 6 A: Go to next step
5. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 9 OK: Go to next step
6. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Replace the mass air flow meter sub-assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT: Go to next step
7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the power switch off and wait for 30 seconds. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0101. Check the DTC judgment result. NEXT --> END
8. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
9. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)

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

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

Inside the mass air flow meter sub-assembly, there is a heated platinum wire which is exposed to the flow of intake air by applying a specific electrical current to the wire.

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

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

HINT

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

Scheme 125

HINT

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

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

Example

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

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

P0102

P0103

Scheme 126

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for at least 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine.
8. Idle the engine for 5 seconds [B].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
10. Read the Pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. During normal driving, increase the vehicle speed to 80 km/h (50 mph) [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
12. Depress the accelerator pedal fully to increase the vehicle speed to between 100 and 120 km/h (62 and 75 mph) (engine speed of 4000 RPM or more) and then maintain the speed for at least 5 seconds [E]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].
14. Read the Pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Input the DTC: P0102 or P0103.
17. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.
18. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 127

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

HINT

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

Scheme 128

1. READ DTC OUTPUT (P0102 OR P0103) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0102 is output A DTC P0103 is output B B --> See step 5 A: Go to next step
2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY) Disconnect the mass air flow meter sub-assembly connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D5-3 (+B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - EFI MAIN RELAY) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) Disconnect the mass air flow meter sub-assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D5-5 (VG) - D28-94 (VG) Always Below 1 ohms D5-4 (E2G) - D28-117 (E2G) Always Below 1 ohms D5-5 (VG) or D28-94 (VG) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY Perform On-vehicle inspection. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . Perform Inspection. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . Inspect the function of the mass air flow meter sub-assembly. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAF. Check that the reading of MAF value changes when the engine is raced. OK The reading changes. NG --> See step 7 OK --> See step 8
5. CHECK HARNESS AND CONNECTOR (SENSOR GROUND) Disconnect the mass air flow meter sub-assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D5-4 (E2G) - Body ground Always Below 1 ohms NG --> See step 6 OK --> See step 7
6. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) Disconnect the mass air flow meter sub-assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D5-4 (E2G) - D28-117 (E2G) Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
7. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

The manifold absolute pressure sensor detects pressure inside the intake manifold as an absolute pressure with a built-in sensor and outputs a voltage. Based on the voltage from the manifold absolute pressure sensor, the ECM controls the air fuel ratio, and detects errors in the pressure sensor using the changes in pressure.

Scheme 129

The manifold absolute pressure sensor detects the intake manifold pressure as a voltage using a built-in sensor. The ECM calculates intake manifold pressure based on this voltage and also calculates the EGR valve and purge VSV opening amount according to changes in the intake manifold pressure. When the intake manifold pressure measured after engine start drops by less than 3 kPa (22.5 mmHg) compared to the intake manifold pressure (atmospheric pressure) measured before engine start, the ECM interprets this as a malfunction in the manifold absolute pressure sensor and stores P0106.

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or higher).
8. Move the shift lever to N.
9. Idle the engine for 10 seconds or more [A].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
11. Read the Pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P0106.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
15. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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.

1. CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO P0106) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0106 is output A DTC P0106 and other DTCs are output B HINT: If any DTCs other than P0106 are output, troubleshoot those DTCs first. B --> See step 6 A: Go to next step
2. READ VALUE USING TECHSTREAM (MANIFOLD ABSOLUTE PRESSURE SENSOR) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAP. Read the MAP value at power switch on (IG). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up. Read the MAP value at idling. Standard Engine condition Techstream Display Power switch on (IG) 80 to 110 kPa (600 to 825 mmHg) Idling 28 to 48 kPa (210 to 360 mmHg) NG --> See step 3 OK --> See step 5
3. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-intake-system-inspection) . OK No leaks in the intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK --> See step 4
4. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)
5. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
6. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)

The manifold absolute pressure sensor detects pressure inside the intake manifold as an absolute pressure with a built-in sensor and outputs a voltage. Based on the voltage from the vacuum sensor, the ECM controls the air fuel ratio, and corrects any errors in the pressure sensor due to changes in pressure.

Scheme 130

HINT

When DTC P0107 or P0108 is detected, check the manifold absolute pressure by selecting Powertrain / Engine and ECT / Data List / Primary / MAP on the Techstream.

The ECM monitors the sensor voltage and uses this value to calculate the manifold absolute pressure. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the manifold absolute pressure sensor and stores a DTC.

Example

When the sensor output voltage remains below 0.5 V, or higher than 4.5 V for 0.5 seconds, the ECM stores a DTC.

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

P0107

P0108

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and wait 5 seconds or more.
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0107 or P0108.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
13. If the judgment result shows INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 131

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.

Scheme 132

1. READ VALUE USING TECHSTREAM (MAP) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAP. Read the MAP value. OK Same value as the actual atmospheric pressure. HINT: Standard atmospheric pressure is 101 kPa (758 mmHg). For every 100 m (328 ft.) increase in altitude, pressure drops by 1 kPa (7.5 mmHg). The pressure also varies due to the weather (high atmospheric pressure, low atmospheric pressure). Also, check "Atmosphere Pressure" in the Data List. NG --> See step 2 OK --> See step 7
2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF MANIFOLD ABSOLUTE PRESSURE SENSOR) Disconnect the manifold absolute pressure sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D3-3 (VC) - D3-2 (E2) Power switch on (IG) 4.5 to 5.5 V D3-1 (PIM) - D3-2 (E2) Power switch on (IG) 3.0 to 5.0 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Manifold Absolute Pressure Sensor) Result Result Proceed to Outside of standard range A Within standard range B B --> See step 4 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (MANIFOLD ABSOLUTE PRESSURE SENSOR - ECM) Disconnect the manifold absolute pressure sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D3-3 (VC) - D28-72 (VCPM) Always Below 1 ohms D3-2 (E2) - D28-71 (EPIM) Always Below 1 ohms D3-1 (PIM) - D28-69 (PIM) Always Below 1 ohms D3-3 (VC) or D28-72 (VCPM) - Body ground Always 10 kohms or higher D3-2 (E2) or D28-71 (EPIM) - Body ground Always 10 kohms or higher D3-1 (PIM) or D28-69 (PIM) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Replace the manifold absolute pressure sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . NEXT: Go to next step
5. CHECK WHETHER DTC OUTPUT RECURS (P0107 OR P0108) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the diving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P0107 or P0108 is output B B --> See step 6 A --> END
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)

Scheme 133

1. The intake air temperature sensor, mounted in the mass air flow meter sub-assembly, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes ( (Scheme 112)(Scheme 133) ).
2. The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R which is located inside the ECM.
3. Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes, according to changes in the intake air temperature, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability.

After warm engine stopped

The ECM monitors the intake air temperature variation in the period from when the engine was warmed up on the previous trip until the next engine start. If the change in the intake air temperature sensor output is less than the threshold, it is determined that a malfunction has occurred in the intake air temperature sensor. When this is detected, the MIL is illuminated and the DTC is stored.

After a cold engine in started

The monitor runs when the engine is started cold after 5 hours or more have elapsed since the engine stopped. If the intake air temperature sensor output variation until the engine has warmed up completely is less than the threshold, it is determined that a malfunction has occurred in the intake air temperature sensor. When this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is stored.

ALL

AFTER ENGINE STOP

AFTER COLD ENGINE START

AFTER ENGINE STOP

AFTER COLD ENGINE START

Scheme 134

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
8. Idle the engine for 5 minutes or more [C]. HINT: During steps [A] through [C], if the change in the intake air temperature is below 1°C (1.8°F), the intake air temperature sensor (mass air flow meter sub-assembly) is malfunctioning. It is not necessary to continue this procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0111.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [E] and [F].
14. Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [E]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
15. Check the DTC judgment result again [F]. HINT: If the judgment result shows INCOMPLETE or N/A, perform steps [E] and [F] again.
16. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0112. Refer to WIRING DIAGRAM .

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0111) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0111 and other DTCs are output A DTC P0111 is output B HINT: If any DTCs other than P0111 are output, troubleshoot those DTCs first. B --> See step 3 A --> See step 2
2. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
3. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

1. The intake air temperature sensor, mounted in the mass air flow meter sub-assembly, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes ( (Scheme 112)see scheme 24 ).
2. The intake air temperature sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R which is located inside the ECM.
3. Resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes, according to changes in the intake air temperature, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability. HINT: When either DTC P0112 or P0113 is stored, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

HINT

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

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

Example

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

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

P0112

P0113

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Wait 0.5 seconds or more.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0112 or P0113.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 135

HINT

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

Scheme 136

Scheme 137

1. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Intake Air. Read the value displayed on the Techstream. OK Same as actual intake air temperature. RESULT Result Proceed to -40°C (-40°F) A Higher than 128°C (262°F) B Same as actual intake air temperature C HINT: If there is an open circuit, the Techstream indicates -40°C (-40°F). If there is a short circuit, the Techstream indicates higher than 128°C (262°F). B --> See step 7 C --> See step 4 A: Go to next step
2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) Disconnect the mass air flow meter sub-assembly connector. TEXT IN ILLUSTRATION *1 Mass Air Flow Meter Sub-assembly *2 ECM *a Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) - - Connect terminals 1 (THA) and 2 (E2) of the mass air flow meter sub-assembly connector on the wire harness side. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Intake Air. Read the value displayed on the Techstream. Standard value Higher than 128°C (262°F) NG --> See step 3 OK --> See step 5
3. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) Disconnect the mass air flow meter sub-assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D5-1 (THA) - D28-116 (THA) Always Below 1 ohms D5-2 (E2) - D28-93 (ETHA) Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
5. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
7. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the mass air flow meter sub-assembly connector. TEXT IN ILLUSTRATION *1 Mass Air Flow Meter Sub-assembly *2 ECM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Intake Air. Read the value displayed on the Techstream. Standard value -40°C (-40°F) NG --> See step 8 OK --> See step 9
8. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) Disconnect the mass air flow meter sub-assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D5-1 (THA) or D28-116 (THA) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 10
9. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
10. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

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

The structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor.

HINT

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

HINT

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

The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a thermistor with a resistance that varies according to the temperature of the engine coolant. When the coolant temperature becomes low, the resistance in the thermistor increases. When the temperature becomes high, the resistance drops. These variations in resistance are reflected in the output voltage from the sensor. The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a fault in the engine coolant temperature sensor circuit and stores a DTC.

Example

If the sensor output voltage is higher than 4.91 V for 0.5 seconds or more, the ECM determines that there is an open in the engine coolant temperature sensor circuit, and stores DTC P0118. Conversely, if the voltage output is below 0.14 V for 0.5 seconds or more, the ECM determines that there is a short in the sensor circuit, and stores DTC P0117.

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

P0115

P0117

P0118

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Wait 0.5 seconds or more.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0115, P0117 or P0118.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 138

HINT

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

Scheme 139

Scheme 140

1. READ VALUE USING TECHSTREAM (ENGINE COOLANT TEMPERATURE) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Read the value displayed on the Techstream. Standard value Between 75°C and 100°C (167°F and 212°F) with warm engine. RESULT Result Proceed to -40°C (-40°F) A Higher than 135°C (275°F) B Between 75°C and 100°C (167°F and 212°F) C HINT: If there is an open circuit, the Techstream indicates -40°C (-40°F). If there is a short circuit, the Techstream indicates higher than 135°C (275°F). B --> See step 7 C --> See step 4 A: Go to next step
2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) Disconnect the engine coolant temperature sensor connector. TEXT IN ILLUSTRATION *1 Engine Coolant Temperature Sensor *2 ECM *a Front view of wire harness connector (to Engine Coolant Temperature Sensor) - - Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Read the value displayed on the Techstream. Standard value Higher than 135°C (275°F) NG --> See step 3 OK --> See step 5
3. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Disconnect the engine coolant temperature sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D6-2 - D28-64 (THW) Always Below 1 ohms D6-1 - D28-65 (ETHW) Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
4. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
5. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
7. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the engine coolant temperature sensor connector. TEXT IN ILLUSTRATION *1 Engine Coolant Temperature Sensor *2 ECM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Read the value displayed on the Techstream. Standard value -40°C (-40°F) NG --> See step 8 OK --> See step 9
8. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) Disconnect the engine coolant temperature sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D6-2 or D28-64 (THW) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 10
9. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
10. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

Refer to DTC P0115. Refer to DESCRIPTION .

Engine Coolant Temperature Sensor Cold Start Monitor

The monitor runs when the engine is started cold. If the change in engine coolant temperature sensor output until the engine warmed up completely is less than the threshold, it is determined that a malfunction has occurred in the engine coolant temperature sensor. When this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is stored.

Engine Coolant Temperature Sensor Soak Monitor

The ECM compares the engine coolant temperature when the warmed engine is stopped and when the engine is started on the next trip when more than 5 hours has elapsed since the engine was stopped. If the change in engine coolant temperature sensor output is less than the threshold, it is determined that a malfunction has occurred in the engine coolant temperature sensor. When this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is stored.

ENGINE COOLANT TEMPERATURE SENSOR RATIONALITY (COLD START MONITOR)

ENGINE COOLANT TEMPERATURE SENSOR RATIONALITY (SOAK MONITOR)

ENGINE COOLANT TEMPERATURE SENSOR RATIONALITY (COLD START MONITOR)

ENGINE COOLANT TEMPERATURE SENSOR RATIONALITY (SOAK MONITOR)

Scheme 141

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
4. Check that the engine coolant temperature is 60°C (140°F) or less.
5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
6. Turn the power switch off and wait for 30 seconds.
7. Turn the power switch on (IG) and turn the Techstream on [A].
8. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
9. Start the engine and idle it for 5 minutes or more [B]. HINT: If the engine coolant temperature does not change by 5°C (9°F) or higher, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
11. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P0116.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E].
15. Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: In the event of the drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed.
16. Check the DTC judgment result again [E]. HINT: If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E] again.
17. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. If any of DTCs P0115, P0117 or P0118 are output simultaneously with DTC P0116, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
3. When the DTC is output, check the engine coolant temperature using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. If the Coolant Temp value is lower than the actual engine coolant temperature, the engine coolant temperature sensor circuit may be malfunctioning. In this case, check the wire harnesses and connectors (and those connections) between the ECM and the engine coolant temperature sensor first.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0116 is output A DTC P0116 and other DTCs are output B HINT: If any DTCs other than P0116 are output, troubleshoot those DTCs first. B --> See step 3 A: Go to next step
2. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY Inspect the water inlet with thermostat sub-assembly opening temperature. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/cooling-fan/#engine-cooling-system-service-information) . NG --> See step 4 OK --> See step 5
3. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
4. REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cooling-fan/#engine-cooling-system-service-information)
5. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

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

Scheme 142

HINT

1. Waiting is required to prevent the temperature of the engine from affecting the readings. If the engine has been operated recently, it will not be possible to accurately compare the readings.
2. For diagnosis, in order to duplicate the detection conditions of the DTC, it is necessary to park the vehicle for 7 hours. Parking the vehicle for 7 hours ensures that the actual temperature of the engine coolant temperature and intake air temperature are very similar. When the vehicle has been parked for less than 7 hours, differences in the readings may exist, this does not necessarily indicate a fault.

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

Scheme 143

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) [A].
4. Turn the power switch off.
5. With the engine stopped, leave the vehicle as is for 7.5 hours or more [B].
6. Turn the power switch on (IG) and turn the Techstream on.
7. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
8. Start the engine and wait 60 seconds or more [C].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P011B.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [D] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P011B) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P011B is output A DTC P011B and other DTCs are output B HINT: If any DTCs other than P011B are output, troubleshoot those DTCs first. B --> See step 4 A: Go to next step
2. READ VALUE USING TECHSTREAM (INTAKE AIR) Leave the vehicle for 7 hours or more. HINT: It is necessary to leave the vehicle for 7 hours or more to allow conditions similar to the DTC detection conditions. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Intake Air. Read the value displayed on the Techstream. OK The difference between the intake air temperature and the actual outside air temperature is within 10°C (18°F). HINT: Temperature readings on the vehicle's outside temperature gauge (if equipped) are not suitable for comparing to the intake air temperature reading. The outside temperature gauge has a significant delay built in to prevent temperature swings from being displayed on its display. Use an accurate thermometer to determine the outside air temperature. NG --> See step 5 OK: Go to next step
3. READ VALUE USING TECHSTREAM (COOLANT TEMP) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Read the value displayed on the Techstream. OK The difference between the coolant temperature and the actual outside air temperature is within 10°C (18°F). HINT: If the result is not as specified, check if there are heat sources such as a block heater in the engine compartment. NG --> See step 7 OK --> See step 6
4. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
7. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

HINT

1. These DTCs relate to the throttle position sensor.

The throttle position sensor is mounted on the throttle body assembly, and detects the opening angle of the throttle valve. This sensor is a non-contact type. It uses Hall-effect elements in order to yield accurate signals even in extreme conditions.

The throttle position sensor has 2 sensor circuits, each of which transmits a signal, VTA1 and VTA2. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA terminals of the ECM.

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

Scheme 144

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

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

1. A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

1. VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

1. VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor circuit, and stores a DTC.

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

P0121

This sensor transmits two signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. The ECM performs several checks to confirm the proper operation of the throttle position sensor and VTA1.

For each throttle opening angle, a specific voltage difference is expected between the outputs of VTA1 and VTA2. If the output voltage difference between the two signals deviates from the normal operating range, the ECM interprets this as a malfunction in the throttle position sensor. The ECM illuminates the MIL and stores the DTC.

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

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

P0121

P0120

P0121

P0122

P0123

P0220

P0222

P0223

P2135 CASE 1

P2135 CASE 2

Scheme 145

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine.
8. With the vehicle stationary, fully depress and release the accelerator pedal [B].
9. Idle the engine for 2 seconds or more [C].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
11. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P0120, P0121, P0122, P0123, P0220, P0222, P0223 or P2135.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [B] and [C] again.
15. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

FAIL-SAFE

When any of these DTCs, as well as other DTCs relating to Electronic Throttle Control System (ETCS) malfunctions, are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 5.5° throttle angle by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system. 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 power switch is then turned off.

Scheme 146

HINT

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

Scheme 147

1. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) Disconnect the throttle body assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D4-5 (VC) - D28-88 (VCTA) Always Below 1 ohms D4-6 (VTA) - D28-90 (VTA1) Always Below 1 ohms D4-4 (VTA2) - D28-89 (VTA2) Always Below 1 ohms D4-3 (E2) - D28-111 (ETA) Always Below 1 ohms D4-5 (VC) or D28-88 (VCTA) - Body ground Always 10 kohms or higher D4-6 (VTA) or D28-90 (VTA1) - Body ground Always 10 kohms or higher D4-4 (VTA2) or D28-89 (VTA2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. INSPECT ECM (VC VOLTAGE) Disconnect the throttle body assembly connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D4-5 (VC) - D4-3 (E2) Power switch on (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Throttle Body Assembly) NG --> See step 5 OK: Go to next step
3. REPLACE THROTTLE BODY ASSEMBLY Replace the throttle body assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0120, P0121, P0122, P0123, P0220, P0222, P0223 and/or P2135 is output A DTC is not output B B --> END A --> See step 6
5. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

Refer to DTC P0115. Refer to DESCRIPTION .

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

Example

The engine coolant temperature is 5°C (41°F) at engine start. After about 90 seconds running time, the engine coolant temperature sensor still indicates that the engine is not warm enough to begin closed-loop fuel (air fuel ratio feedback) control. The ECM interprets this as a malfunction in the sensor or cooling system and stores the DTC.

1. Leave the vehicle outside overnight.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
5. Check that the engine coolant temperature is 5°C (41°F) or less.
6. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
7. Turn the power switch off and wait for 30 seconds.
8. Turn the power switch on (IG) and turn the Techstream on.
9. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
10. Start the engine.
11. Wait 21 minutes or more.
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
13. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P0125.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
17. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0115. Refer to WIRING DIAGRAM .

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0125 is output A DTC P0125 and other DTCs are output B HINT: If any DTCs other than P0125 are output, troubleshoot those DTCs first. B --> See step 4 A: Go to next step
2. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY Inspect the water inlet with thermostat sub-assembly opening temperature. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/cooling-fan/#engine-cooling-system-service-information) . NG --> See step 5 OK: Go to next step
3. CHECK COOLING SYSTEM Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications. NG --> REPAIR OR REPLACE COOLING SYSTEM OK --> See step 6
4. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cooling-fan/#engine-cooling-system-service-information)
6. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

HINT

1. This DTC relates to the water inlet with thermostat sub-assembly.

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

Scheme 148

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

Scheme 149

1. Stop the engine and allow it to soak.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and turn the Techstream on [A].
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
5. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp and Intake Air.
6. Check if "Coolant Temp" is 56°C (133°F) or less and "Intake Air" is between 0 and 35°C (32 and 95°F).
7. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
8. Set the heater to MAX HOT with fresh air mode selected and turn the A/C off.
9. Start the engine and drive the vehicle at 80 km/h (50 mph) for 15 minutes [B]. HINT: Data can be captured relatively easily by using the snapshot function in the Data List. Enter the following menus: Data List / Function / Snapshot Configure / Duration / 5 min. Data capture can be started by using the target point. For example, setting the target point to an accelerator position of 90% and then racing the engine, etc. to depress the accelerator pedal for accelerator position of 90% or more will cause data capture to start.
10. After driving the vehicle at 80 km/h (50 mph) and "Coolant Temp" stabilizes, check that "Coolant Temp" is 75°C (167°F) or higher [C]. HINT: If "Coolant Temp" is below 75°C (167°F) while driving the vehicle at 80 km/h (50 mph), inspect the cooling system and thermostat.

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0128 is output A DTC P0128 and other DTCs are output B HINT: If any DTCs other than P0128 are output, troubleshoot those DTCs first. B --> See step 4 A: Go to next step
2. CHECK COOLING SYSTEM Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications. NG --> REPAIR OR REPLACE COOLING SYSTEM OK: Go to next step
3. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY Inspect the water inlet with thermostat sub-assembly opening temperature. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/cooling-fan/#engine-cooling-system-service-information) . NG --> See step 5 OK --> See step 6
4. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/cooling-fan/#engine-cooling-system-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

HINT

Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located far from the engine assembly.

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

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

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

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

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

Scheme 150

Scheme 151

Scheme 152

Scheme 153

1. Active Air Fuel Ratio Control The ECM usually performs air fuel ratio feedback control so that the air fuel ratio sensor output indicates a near stoichiometric air fuel level. This vehicle includes active air fuel ratio control in addition to regular air fuel ratio control. The ECM performs active air fuel ratio control to detect any deterioration in the three-way catalytic converter and heated oxygen sensor malfunctions (refer to the diagram below). Active air fuel ratio control is performed for approximately 30 seconds or more while driving with a warm engine. During active air fuel ratio control, the air fuel ratio is forcibly regulated to become lean or rich by the ECM. If the ECM detects a malfunction, a DTC is stored.
2. Abnormal Voltage Output of Heated Oxygen Sensor (DTC P0136) While the ECM is performing active air fuel ratio control, the air fuel ratio is forcibly regulated to become rich or lean. If the sensor is not functioning properly, the voltage output variation is small. For example, when the heated oxygen sensor voltage does not increase to higher than 0.59 V during active air fuel ratio control, the ECM determines that the sensor voltage output is abnormal and stores DTCs P0136.
3. Open or Short in Heated Oxygen Sensor Circuit (DTC P0137) During active air fuel ratio control, the ECM calculates the oxygen storage capacity* of the three-way catalytic converter by forcibly regulating the air fuel ratio to become rich or lean. If the heated oxygen sensor has an open, or the voltage output of the sensor noticeably decreases, the oxygen storage capacity indicates an extraordinarily high value. Even if the ECM attempts to continue regulating the air fuel ratio to become rich or lean, the heated oxygen sensor output does not change. While performing active air fuel ratio control, when the target air fuel ratio is rich and the heated oxygen sensor voltage output is below 0.21 V (lean), the ECM interprets this as an abnormally low sensor output voltage and stores DTC P0137. *: The three-way catalytic converter has the capability to store oxygen. The oxygen storage capacity and the emission purification capacity of the three-way catalytic converter are mutually related. The ECM determines whether the catalyst has deteriorated, based on the calculated oxygen storage capacity value. Refer to «DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes) .
4. High or Low Impedance of Heated Oxygen Sensor (DTCs P0136 or P0137) During normal air fuel ratio feedback control, there are small variations in the exhaust gas oxygen concentration. In order to continuously monitor the slight variation of the heated oxygen sensor signal while the engine is running, the impedance* of the sensor is measured by the ECM. The ECM determines that there is a malfunction in the sensor when the measured impedance deviates from the standard range. *: The effective resistance in an alternating current electrical circuit. HINT: The impedance cannot be measured using an ohmmeter. DTC P0136 indicates the deterioration of the heated oxygen sensor. The ECM stores the DTCs by calculating the impedance of the sensor when the typical enabling conditions are satisfied (2 driving cycles). DTC P0137 indicates an open or short circuit in the heated oxygen sensor (2 driving cycles). The ECM stores the DTCs when the impedance of the sensor exceeds the threshold of 15 kohms.
5. Extremely High Output Voltage of Heated Oxygen Sensor (DTC P0138) The ECM continuously monitors the heated oxygen sensor output voltage while the engine is running. DTC P0138 is stored if the heated oxygen sensor voltage output is 1.2 V or higher for 10 seconds or more.
6. Abnormal Voltage Output of Heated Oxygen Sensor During Fuel-cut (DTC P0139) The sensor output voltage drops to below 0.2 V (extremely lean status) immediately when the vehicle decelerates and fuel cut is operating. If the voltage does not drop to below 0.2 V for 6 seconds or more, or the voltage does not drop from 0.35 to 0.2 V for 1 second or more, the ECM determines that the sensor response has deteriorated, illuminates the MIL and stores a DTC.

ALL

P0136 AND P0137: HEATED OXYGEN SENSOR (SENSOR 2) VOLTAGE CHECK (VOLTAGE MALFUNCTION AND LOW VOLTAGE)

P0136: HEATED OXYGEN SENSOR (SENSOR 2) CIRCUIT CONTINUITY CHECK (CIRCUIT SHORT)

P0137: HEATED OXYGEN SENSOR (SENSOR 2) CIRCUIT CONTINUITY CHECK (CIRCUIT OPEN)

P0138: HEATED OXYGEN SENSOR (SENSOR 2) CIRCUIT CONTINUITY CHECK (OUT OF RANGE)

P0139: HEATED OXYGEN SENSOR (SENSOR 2) RESPONSE RATE DURING FUEL CUT

P0136: HEATED OXYGEN SENSOR (SENSOR 2) VOLTAGE CHECK (VOLTAGE MALFUNCTION)

P0137: HEATED OXYGEN SENSOR (SENSOR 2) VOLTAGE CHECK (LOW VOLTAGE)

P0136: HEATED OXYGEN SENSOR (SENSOR 2) CIRCUIT CONTINUITY CHECK (CIRCUIT SHORT)

P0137: HEATED OXYGEN SENSOR (SENSOR 2) CIRCUIT CONTINUITY CHECK (CIRCUIT OPEN)

P0138: HEATED OXYGEN SENSOR (SENSOR 2) CIRCUIT CONTINUITY CHECK (OUT OF RANGE)

P0139: HEATED OXYGEN SENSOR (SENSOR 2) RESPONSE RATE DURING FUEL CUT

Refer to detailed information in Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

P0137: O2 SENSOR / MAX VOL B1S2

P0139: O2 SENSOR / RL F/C B1S2

P0139: O2 SENSOR / F/C TIME B1S2

P0136: O2 SENSOR / MAX OSC B1S2

HINT

1. This confirmation driving pattern is used in the "Perform Confirmation Driving Pattern" procedure of the following diagnostic troubleshooting procedure.
2. Performing this confirmation driving pattern will activate the heated oxygen sensor monitor (The catalyst monitor is performed simultaneously). This is very useful for verifying the completion of a repair.

P0136, P0137 and P0138

Scheme 154

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
8. Drive the vehicle at 75 to 120 km/h (47 to 75 mph) for 10 minutes or more [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0136, P0137 or P0138.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform step [C] and [D] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

P0139

Scheme 155

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
8. Drive the vehicle at 75 km/h (47 mph), and then decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel-cut [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0139.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, move the shift lever to B and then perform step [C] and [D] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 156

HINT

Malfunctioning areas can be identified by performing the Control the Injection Volume function provided in the Active Test. The Control the Injection Volume 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 operation using the Techstream.

Scheme 157

Scheme 158

Scheme 159

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
4. Start the engine.
5. Warm up the engine at an engine speed of 2500 RPM for approximately 90 seconds. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, warm up the engine after charging control has completed.
6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Data List / Gas AF Control / AFS Voltage B1S1 and O2S B1S2.
7. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
8. Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream. HINT: Change the fuel injection volume within the range of -12% to +12%. The injection volume can be changed in fine gradations. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning. Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) +12% Rich Below 3.1 V AFS Voltage B1S1 (Air fuel ratio) -12% Lean Higher than 3.4 V O2S B1S2 (Heated oxygen) +12% Rich Higher than 0.55 V O2S B1S2 (Heated oxygen) -12% Lean Below 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 4 Fuel injector assembly Fuel pressure Gas leak from exhaust system (air-fuel ratio extremely rich or lean) Following the Control the Injection Volume 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 and ECT / Active Test / Control the Injection Volume / Data List / Gas AF Control / AFS Voltage B1S1 and O2S B1S2.

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

HINT

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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.
2. Sensor 1 refers to the sensor closest to the engine assembly.
3. Sensor 2 refers to the sensor farthest away from the engine assembly.

Scheme 160

Scheme 161

1. READ OUTPUT DTC (DTC P0136, P0137, P0138 OR P0139) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0138 is output A DTC P0137 is output B DTC P0136 is output C DTC P0139 is output D DTC P0136, P0137 or P0138 and other DTCs are output E B --> See step 8 C --> See step 4 D --> See step 21 E --> See step 27 A: Go to next step
2. 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 2 (+B) - 4 (E2) Always 10 kohms or higher 2 (+B) - 3 (OX1B) Always 10 kohms or higher TEXT IN ILLUSTRATION *a Component without harness connected (Heated Oxygen Sensor) NG --> See step 28 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT) Turn the power switch off and wait for 5 minutes or more. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D28-41 (HT1B) - D28-125 (OX1B) Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 33
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Data List / Gas AF Control / O2S B1S2. Change the fuel injection volume using the Techstream, and monitoring the voltage output of heated oxygen sensor displayed on the Techstream. HINT: Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in fine gradations within this range. The heated oxygen sensor has a maximum output delay of approximately 20 seconds. Standard Fluctuates between 0.4 V or less and 0.55 V or higher. NG --> See step 8 OK: Go to next step
5. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Data List / Gas AF Control / AFS Voltage B1S1. 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 fine gradations within this range. The air fuel ratio sensor is displayed as AFS Voltage B1S1 and the heated oxygen sensor is displayed as O2S B1S2 on the Techstream. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning. Result Techstream Display (Sensor) Voltage Variation Proceed to AFS Voltage B1S1 (Air fuel ratio) Alternates between more and below 3.3 V OK AFS Voltage B1S1 (Air fuel ratio) Remains at higher than 3.3 V NG AFS Voltage B1S1 (Air fuel ratio) Remains at below 3.3 V NG HINT: A normal heated oxygen sensor voltage (O2S B1S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either below or higher than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning. NG --> See step 16 OK: Go to next step
6. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. NG --> See step 7 OK --> See step 29
7. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 30 OK --> See step 29
8. CHECK EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK: Go to next step
9. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Inspect the heated oxygen sensor. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NG --> See step 28 OK: Go to next step
10. 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 Tester Connection Condition Specified Condition D9-1 (HT1B) - D28-41 (HT1B) Always Below 1 ohms D9-3 (OX1B) - D28-125 (OX1B) Always Below 1 ohms D9-4 (E2) - D28-102 (O1B-) Always Below 1 ohms D9-1 (HT1B) or D28-41 (HT1B) - Body ground Always 10 kohms or higher D9-3 (OX1B) or D28-125 (OX1B) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
11. REPLACE HEATED OXYGEN SENSOR Replace the heated oxygen sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT: Go to next step
12. PERFORM CONFIRMATION DRIVING PATTERN Perform Confirmation Driving Pattern (P0136, P0137 and P0138). NEXT: Go to next step
13. CHECK WHETHER DTC OUTPUT RECURS (P0136, P0137 OR P0138) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTCs: P0136, P0137 or P0138. Check that the DTC monitor is NORMAL. If DTC monitor is INCOMPLETE, perform again but increase the vehicle speed. RESULT Result Proceed to ABNORMAL (DTC P0136, P0137 or P0138 is output) A NORMAL (DTC is not output) B B --> END A: Go to next step
14. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. NG --> See step 15 OK --> See step 31
15. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 30 OK --> See step 31
16. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT: Go to next step
17. PERFORM CONFIRMATION DRIVING PATTERN Perform Confirmation Driving Pattern (P0136, P0137 and P0138). NEXT: Go to next step
18. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137 OR P0138) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTCs: P0136, P0137 or P0138. Check that the DTC monitor is NORMAL. If the DTC monitor is INCOMPLETE, perform the drive pattern again but increase the vehicle speed. RESULT Result Proceed to ABNORMAL (DTC P0136, P0137 or P0138 is output) A NORMAL (DTC is not output) B B --> END A: Go to next step
19. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. NG --> See step 20 OK --> See step 28
20. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 30 OK --> See step 28
21. CHECK FOR EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK: Go to next step
22. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT) Turn the power switch off and wait for 5 minutes or more. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D28-41 (HT1B) - D28-125 (OX1B) Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
23. PERFORM CONFIRMATION DRIVING PATTERN Perform Confirmation Driving Pattern (P0139). NEXT: Go to next step
24. READ DTC OUTPUT (P0139 IS OUTPUT AGAIN) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC P0139 is output A DTC is not output B B --> See step 32 A: Go to next step
25. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. NG --> See step 26 OK --> See step 28
26. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 30 OK --> See step 28
27. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
28. REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
29. CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (FUEL INJECTOR ASSEMBLY, FUEL SYSTEM, INTAKE SYSTEM, ETC.). Refer to «DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1)»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes)
30. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)
31. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
32. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
33. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

HINT

Refer to DTC P2195. Refer to DESCRIPTION .

*: Calculated by ECM based on the air fuel ratio sensor output.

After the engine has been warmed up, the ECM carries out air-fuel ratio feedback control, and maintains the air-fuel ratio at the theoretical level. In addition, after all the preconditions have been met, active air-fuel ratio control is carried out for approximately 10 seconds and during active air-fuel ratio control, the ECM measures the response of the air-fuel ratio sensor by increasing or decreasing a specific injection quantity based on the theoretical air-fuel ratio learned during normal air-fuel control. The ECM determines whether there is an air-fuel ratio sensor malfunction at the mid-point of active air-fuel ratio control.

If the air-fuel ratio sensor's response ability is reduced, DTC P014C and P014D are output.

If the air-fuel ratio sensor output timing is delayed, DTC P015A and P015B are output.

Scheme 162

P014C: AIR FUEL RATIO SENSOR (SENSOR 1) RESPONSE RATE (RICH TO LEAN RESPONSE RATE)

P014D: AIR FUEL RATIO SENSOR (SENSOR 1) RESPONSE RATE (LEAN TO RICH RESPONSE RATE)

P015A: AIR FUEL RATIO SENSOR (SENSOR 1) RESPONSE RATE (RICH TO LEAN DELAY)

P015B: AIR FUEL RATIO SENSOR (SENSOR 1) RESPONSE RATE (LEAN TO RICH DELAY)

Refer to detailed information in Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

P014C: O2 SENSOR / RL RES RATE B1S1

P014D: O2 SENSOR / LR RES RATE B1S1

P015A: O2 SENSOR / RL DELAY B1S1

P015B: O2 SENSOR / LR DELAY B1S1

HINT

Performing this confirmation pattern will activate the air fuel ratio sensor response monitor.

Scheme 163

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the power switch on (IG) and turn the Techstream on.
7. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
8. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor.
9. Check that O2 Sensor / Current is incomplete. HINT: The test values for the test items RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1 and LR DELAY B1S1 do not exist in the Detail of O2 Sensor monitor at this time (the initial value of "0.000" is indicated in each test item).
10. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or higher) [A].
11. Drive the vehicle at a constant speed between 75 and 100 km/h (47 and 62 mph) for 10 minutes [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
12. Check that the monitor item O2 Sensor / Current becomes Complete. HINT: Check the test values on the Techstream by entering the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / O2 Sensor / Details / RL RES RATE B1S1, LR RES RATE B1S1, RL DELAY B1S1 and LR DELAY B1S1.
13. If the monitor item O2 Sensor / Current does not become Complete (if the test values indicated on the Techstream do not change), perform Readiness Monitor Drive Pattern for the air fuel ratio sensor and heated oxygen sensor. Refer to «READINESS MONITOR DRIVE PATTERN»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__readiness-monitor-drive-pattern) .
14. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
15. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Input the DTC: P014C, P014D, P015A or P015B.
18. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
19. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P2195. Refer to WIRING DIAGRAM .

HINT

1. 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.
2. 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.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
4. Sensor 1 refers to the sensor closest to the engine assembly.
5. Sensor 2 refers to the sensor farthest away from the engine assembly.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P014C, P014D, P015A OR P015B) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P014C, P014D, P015A or P015B is output A DTC P014C, P014D, P015A or P015B and other DTCs are output B HINT: If any DTCs other than P014C, P014D, P015A or P015B are output, troubleshoot those DTCs first. B --> See step 10 A: Go to next step
2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Inspect the air fuel ratio sensor. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NG --> See step 11 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM). Refer to «PROCEDURE - Step 1»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-circuit-tests) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK AIR FUEL RATIO SENSOR Check that the proper air fuel ratio sensors are installed to the vehicle. NG --> See step 12 OK: Go to next step
5. PERFORM CONFIRMATION DRIVING PATTERN Drive the vehicle according to the Confirmation Driving Pattern. NEXT: Go to next step
6. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC P014C, P014D, P015A or P015B are output A DTC is not output B B --> See step 13 A: Go to next step
7. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT: Go to next step
8. PERFORM CONFIRMATION DRIVING PATTERN Drive the vehicle according to the Confirmation Driving Pattern. NEXT: Go to next step
9. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC is not output A DTC P014C, P014D, P015A or P015B are output B B --> See step 14 A --> END
10. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
11. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
12. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
13. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
14. CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO. Refer to «DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1)»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes)

The fuel trim is related to the feedback compensation value, not to the basic injection duration. The fuel trim consists of both the short-term and long-term fuel trim.

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

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short-term fuel trim compensation.

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

HINT

1. When DTC P0171 is stored, the actual air fuel ratio is on the lean side. When DTC P0172 is stored, the actual air fuel ratio is on the rich side.
2. If the vehicle runs out of fuel, the air fuel ratio is lean and DTC P0171 may be stored. The MIL is then illuminated.
3. When the total of the short-term and long-term fuel trim values is within the malfunction threshold (and the engine coolant temperature is higher than 75°C (167°F)), the system is functioning normally.

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

Example

Scheme 164

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

FUEL TRIM

FUEL TRIM

Scheme 165

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or higher) with all the accessories switched off [B].
8. With the engine warmed up, idle the engine for 2 minutes or more [C].
9. Drive the vehicle at between 75 and 120 km/h (47 and 75 mph) for 5 minutes or more [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
11. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning.
12. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Air fuel ratio sensor circuit: Refer to DTC P2195. Refer to WIRING DIAGRAM .

Mass air flow meter circuit: Refer to DTC P0102. Refer to WIRING DIAGRAM .

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

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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.
2. A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
3. A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
4. Sensor 1 refers to the sensor closest to the engine assembly.
5. Sensor 2 refers to the sensor farthest away from the engine assembly.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171 OR P0172) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0171 or P0172 are output A DTC P0171 or P0172 and other DTCs are output B HINT: If any DTCs other than P0171 or P0172 are output, troubleshoot those DTCs first. B --> See step 23 A: Go to next step
2. CHECK PCV HOSE CONNECTIONS Check the PCV hose connections. Refer to «COMPONENTS»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . OK PCV valve and hose are connected correctly and are not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
3. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-intake-system-inspection) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine. Warm up the engine at an engine speed of 2500 RPM for approximately 90 seconds. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, warm up the engine after charging control has completed. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Data List / Gas AF Control / AFS Voltage B1S1 and O2S B1S1. Perform the Control the Injection Volume operation with the engine idling. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream. HINT: Change the fuel injection volume within the range of -12% to +12%. The injection volume can be changed in fine gradations. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning. Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) +12% Rich Below 3.1 V AFS Voltage B1S1 (Air fuel ratio) -12% Lean Higher than 3.4 V O2S B1S2 (Heated oxygen) +12% Rich Higher than 0.55 V O2S B1S2 (Heated oxygen) -12% Lean Below 0.4 V RESULT Status of AFS Voltage B1S1 Status of O2S B1S2 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 blockage Gas leaks from exhaust system Intake system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor EGR valve assembly A Rich Rich Actual air fuel ratio rich - Fuel injector leak 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 EGR valve assembly B Rich Lean/Rich Air fuel ratio sensor malfunction - Air fuel ratio sensor B Lean: During the Control the Injection Volume Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently below 0.4 V. Rich: During the Control the Injection Volume Active Test, the AFS Voltage is consistently below 3.1 V, and the O2S is consistently higher than 0.55 V. Lean/Rich: During the Control the Injection Volume Active Test, the output voltage of the heated oxygen sensor alternates correctly. HINT: Refer to "Data List / Active Test" [AFS Voltage B1S1 and O2S B1S2]. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . B --> See step 11 A: Go to next step
5. READ VALUE USING TECHSTREAM (COOLANT TEMP) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Read Coolant Temp twice, when the engine is both cold and warmed up. Standard Techstream Display Condition Specified Condition Coolant Temp Cold engine Same as ambient air temperature Warm engine Between 75 and 100°C (167 and 212°F) NG --> See step 24 OK: Go to next step
6. READ VALUE USING TECHSTREAM (MAF) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAF, Coolant Temp and Engine speed. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher. Read MAF with the engine speed at 2500 RPM. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, read the Data List after charging control has completed. Standard Techstream Display Condition Specified Condition MAF Shift lever position: N A/C: Off Engine Speed: 2500 RPM Between 4.5 gm/sec and 8.5 gm/sec NG --> See step 18 OK: Go to next step
7. CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-inspection) . NG --> REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step
8. CHECK FOR EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks NG --> REPAIR OR REPLACE EXHAUST SYSTEM OK: Go to next step
9. CHECK FOR SPARK (SPARK TEST) Perform a spark test. Refer to «ON-VEHICLE INSPECTION - Step 1»(/toyota/prius-v/i-2011-2014/remont/ignition-system/#ignition-system-inspection) . HINT: If the result of the spark test is normal, proceed to the next step. If the spark plugs or ignition system malfunctions, engine misfire may occur. The misfire count can be read using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Cylinder #1 Misfire Count (to Cylinder #4 Misfire Count). NEXT: Go to next step
10. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME) Check the injection and volume. HINT: Refer to the fuel injector assembly inspection procedure. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-service-information) . If the injectors malfunction, engine misfire may occur. The misfire count can be read using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Cylinder #1 Misfire Count (to Cylinder #4 Misfire Count). RESULT Result Proceed to NG A OK B B --> See step 15 A --> See step 25
11. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Inspect the air fuel ratio sensor. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NG --> See step 26 OK: Go to next step
12. CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR FUEL RATIO SENSOR) See step 2 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - EFI MAIN RELAY) OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM). Refer to «PROCEDURE - Step 1»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-circuit-tests) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
14. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT: Go to next step
15. CHECK WHETHER DTC OUTPUT RECURS (P0171 OR P0172) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC P0171 or P0172 is output A DTC is not output B B --> END A: Go to next step
16. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in EGR valve. Result Result Proceed to Outside of standard range A Within standard range B B --> See step 18 A: Go to next step
17. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 27 OK: Go to next step
18. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . HINT: Repair any problems. NEXT: Go to next step
19. CHECK WHETHER DTC OUTPUT RECURS (P0171 OR P0172) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC P0171 or P0172 is output A DTC is not output B B --> END A: Go to next step
20. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) See step 3 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
21. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Replace the mass air flow meter sub-assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . HINT: If the result of the inspection performed in step 6 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly. NEXT: Go to next step
22. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC is not output A DTC P0171 or P0172 is output B B --> See step 28 A --> END
23. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
24. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
25. REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-service-information)
26. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
27. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)
28. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

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

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

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

1. Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfiring rate (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs once.
2. An excessive misfiring rate (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

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

HINT

If a catalyst damage misfire occurs, the monitor informs the driver by blinking the MIL (1 trip).

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

MISFIRE

MONITOR PERIOD OF EMISSION-RELATED MISFIRE

MONITOR PERIOD OF CATALYST DAMAGING MISFIRE (MIL BLINKS)

MONITOR PERIOD OF EMISSION RELATED MISFIRE

MONITOR PERIOD OF CATALYST DAMAGING MISFIRE (MIL BLINKS)

Refer to detailed information in Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

P0300: MISFIRE / EWMA MISFIRE

P0300: MISFIRE / MISFIRE RATE

P0301: MISFIRE / EWMA MISFIRE1

P0301: MISFIRE / MISFIRE RATE1

P0302: MISFIRE / EWMA MISFIRE2

P0302: MISFIRE / MISFIRE RATE2

P0303: MISFIRE / EWMA MISFIRE3

P0303: MISFIRE / MISFIRE RATE3

P0304: MISFIRE / EWMA MISFIRE4

P0304: MISFIRE / MISFIRE RATE4

HINT

*: EWMA (Exponential Weighted Moving Average) misfire counts for last 10 driving cycles (calculated) Calculation: 0.1 x (current counts) + 0.9 x (previous average). Initial value for (previous average) = 0

Fuel injector circuit: Refer to Fuel Injector Circuit. Refer to WIRING DIAGRAM .

Mass air flow meter circuit: Refer to DTC P0102. Refer to WIRING DIAGRAM .

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Record the DTC(s) and freeze frame data.
5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Using the Techstream, switch the ECM from normal mode to check mode. Refer to «CHECK MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-mode-procedure) .
8. Read the misfire counts of each cylinder, Cylinder #1 Misfire Count to Cylinder #4 Misfire Count, with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.
9. Drive the vehicle several times with the conditions, such as engine speed and engine load, shown in Misfire RPM and Misfire Load in the freeze frame data. HINT: In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, using the Misfire RPM and Misfire Load in the Data List. Engine Speed Duration Idling 4 minutes or more 1000 4 minutes and 30 seconds or more 2000 2 minutes and 30 seconds or more 3000 1 minute and 30 seconds or more
10. Check whether misfires have occurred by checking DTCs and freeze frame data. HINT: Do not turn the power switch off until the stored DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data will be cleared.
11. Record the DTC(s), freeze frame data and misfire counts.
12. Turn the power switch off and wait for at least 5 seconds.
13. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .

HINT

1. If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
3. If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
4. If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem: There was insufficient fuel in the tank. Improper fuel is used. The spark plugs have been contaminated. The problem requires further diagnosis.
5. After finishing repairs, check the misfire counts of the cylinders Cylinder #1 Misfire Count to Cylinder #4 Misfire Count.
6. Be sure to confirm that no misfiring cylinder DTCs are stored again by conducting the confirmation driving pattern after finishing repairs.
7. When one of Short FT #1or Long FT #1 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).
8. When the Coolant Temp in the freeze frame data is below 75°C (167°F), the misfire has occurred only while warming up the engine.
9. An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs detection.

Scheme 166

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0300, P0301, P0302, P0303 and/or P0304 are output A DTC P0300, P0301, P0302, P0303 and/or P0304 and other DTCs are output B HINT: If any DTCs other than P0300, P0301, P0302, P0303 and/or P0304 are output, troubleshoot those DTCs first. B --> See step 37 A: Go to next step
2. CHECK PCV HOSE CONNECTIONS Check the PCV hose connections. Refer to «COMPONENTS»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . OK PCV valve and hose are correctly connected and are not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
3. READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Misfire RPM and Misfire Load. Read and note the Misfire RPM and Misfire Load values. HINT: The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred. NEXT: Go to next step
4. READ VALUE USING TECHSTREAM (CYLINDER #1 (TO #4) MISFIRE COUNT) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Cylinder #1 (to #4) Misfire Count. Allow the engine to idle. Read each value for Cylinder #1 (to #4) Misfire Count displayed on the Techstream. If no misfire counts occur in any cylinders, perform steps [A] and [B], and then check the misfire counts again. Drive the vehicle with the Misfire RPM and Misfire Load noted in the read value using the Techstream (Misfire RPM and Misfire Load) procedures above [A]. Read Cylinder #1 (to #4) Misfire Count or the DTCs displayed on the Techstream [B]. 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 freeze frame data record of the engine coolant temperature is below 75°C (167°F), it may only be possible to detect the misfire when the engine is cold. B --> See step 18 A: Go to next step
5. INSPECT SPARK PLUG Inspect the spark plug of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 3»(/toyota/prius-v/i-2011-2014/remont/ignition-system/#ignition-system-inspection) . NG --> See step 38 OK: Go to next step
6. CHECK FOR SPARK (SPARK TEST) Perform a spark test. Refer to «ON-VEHICLE INSPECTION - Step 1»(/toyota/prius-v/i-2011-2014/remont/ignition-system/#ignition-system-inspection) . HINT: If the result of the spark test is normal, proceed to the next step. NEXT: Go to next step
7. CHECK CYLINDER COMPRESSION PRESSURE Measure the cylinder compression pressure of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 8»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION OK: Go to next step
8. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY) Disconnect the ECM connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D27-85 (#10) - D27-109 (E01) Power switch on (IG) 11 to 14 V D27-84 (#20) - D27-109 (E01) Power switch on (IG) 11 to 14 V D27-83 (#30) - D27-109 (E01) Power switch on (IG) 11 to 14 V D27-82 (#40) - D27-109 (E01) Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) NG --> See step 45 OK: Go to next step
9. 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»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-service-information) . NG --> See step 39 OK: Go to next step
10. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-intake-system-inspection) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
11. CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-inspection) . NG --> See step 36 OK: Go to next step
12. READ VALUE USING TECHSTREAM (COOLANT TEMP) See step 5 NG --> See step 40 OK: Go to next step
13. READ VALUE USING TECHSTREAM (MAF) See step 6 NG --> See step 31 OK: Go to next step
14. ADJUST VALVE TIMING See step 8 NEXT: Go to next step
15. CHECK WHETHER DTC OUTPUT RECURS (P0300, P0301, P0302, P0303 OR P0304) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC P0300, P0301, P0302, P0303 or P0304 is output A DTC is not output B B --> END A: Go to next step
16. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. Result Result Proceed to Outside of standard range A Within standard range B B --> See step 31 A: Go to next step
17. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. RESULT Result Proceed to NG A OK B B --> See step 31 A --> See step 41
18. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-intake-system-inspection) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
19. CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-inspection) . NG --> See step 36 OK: Go to next step
20. READ VALUE USING TECHSTREAM (COOLANT TEMP) See step 5 NG --> See step 40 OK: Go to next step
21. READ VALUE USING TECHSTREAM (MAF) See step 6 NG --> See step 31 OK: Go to next step
22. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. Result Result Proceed to Outside of standard range A Within standard range B B --> See step 31 A: Go to next step
23. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 41 OK: Go to next step
24. INSPECT SPARK PLUG Remove the ignition coil assembly and the spark plug from the misfiring cylinder. Inspect the spark plug of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 3»(/toyota/prius-v/i-2011-2014/remont/ignition-system/#ignition-system-inspection) . NG --> See step 38 OK: Go to next step
25. CHECK FOR SPARK (SPARK TEST) Perform a spark test. Refer to «ON-VEHICLE INSPECTION - Step 1»(/toyota/prius-v/i-2011-2014/remont/ignition-system/#ignition-system-inspection) . HINT: If the result of the spark test is normal, proceed to the next step. NEXT: Go to next step
26. CHECK CYLINDER COMPRESSION PRESSURE Measure the cylinder compression pressure of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 8»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information) . NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION OK: Go to next step
27. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY) Disconnect the ECM connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D27-85 (#10) - D27-109 (E01) Power switch on (IG) 11 to 14 V D27-84 (#20) - D27-109 (E01) Power switch on (IG) 11 to 14 V D27-83 (#30) - D27-109 (E01) Power switch on (IG) 11 to 14 V D27-82 (#40) - D27-109 (E01) Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) NG --> See step 42 OK: Go to next step
28. 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»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-service-information) . NG --> See step 39 OK: Go to next step
29. ADJUST VALVE TIMING See step 8 NEXT: Go to next step
30. CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. RESULT Result Proceed to DTC P0300, P0301, P0302, P0303 or P0304 is output A DTC is not output B B --> END A: Go to next step
31. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . HINT: Repair any problems. NEXT: Go to next step
32. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the power switch off and wait for 30 seconds. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0300, P0301, P0302, P0303 or P0304. Check the DTC judgment result. RESULT Result Proceed to ABNORMAL (DTC P0300, P0301, P0302, P0303 or P0304 is output) A NORMAL (DTC is not output) B B --> END A: Go to next step
33. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) See step 3 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
34. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Replace the mass air flow meter sub-assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . HINT: If the results of the inspections performed in steps 13 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly. NEXT: Go to next step
35. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the power switch off and wait for 30 seconds. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0300, P0301, P0302, P0303 or P0304. Check the DTC judgment result. RESULT Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0300, P0301, P0302, P0303 or P0304 is output) B B --> See step 43 A --> END
36. CHECK FUEL LINE Check the fuel lines for leaks or blockage. NG --> REPAIR OR REPLACE FUEL LINE OK --> See step 44
37. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
38. REPLACE SPARK PLUG. Refer to «REMOVAL - Step 6»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
39. REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-service-information)
40. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
41. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)
42. GO TO FUEL INJECTOR CIRCUIT. Refer to «Fuel Injector Circuit»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-circuit-tests)
43. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
44. REPLACE FUEL PUMP. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/fuel-system/#fuel-system-service-information)
45. GO TO FUEL INJECTOR CIRCUIT. Refer to «Fuel Injector Circuit»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-circuit-tests)

A flat type knock control sensor is used. Flat type knock control sensors (non-resonant type) have a structure that can detect vibrations over a wide band of frequencies: between approximately 6 kHz and 15 kHz.

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

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

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

HINT

When either DTC P0327 or P0328 is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the power switch is turned off.

Reference: Inspection using an oscilloscope

Scheme 167

Standard

If the output voltage transmitted by the knock control sensor remains low or high for more than 1 second, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

The monitor for DTCs P0327 and P0328 begins to run when 5 seconds have elapsed since the engine was started.

If the malfunction is not repaired successfully, DTC P0327 or P0328 is stored 5 seconds after the engine is next started.

P0327: KNOCK CONTROL SENSOR RANGE CHECK (LOW VOLTAGE)

P0328: KNOCK CONTROL SENSOR RANGE CHECK (HIGH VOLTAGE)

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and wait 5 minutes.
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0327 or P0328.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or N/A, idle the engine for 5 minutes and check the DTC judgment result again.
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 168

HINT

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

Scheme 169

1. READ VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine. Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Knock Feedback Value. Read the value while driving the vehicle. OK The value changes. HINT: Malfunction does not occur Knock Feedback Value changes Malfunctions occur Knock Feedback Value does not change The knock feedback value change can be confirmed by running the engine with a high load, for example, by racing the engine. NG --> See step 2 OK --> See step 5
2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR) Disconnect the knock control sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition F1-2 - F1-1 Power switch on (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Knock Control Sensor) NG --> See step 4 OK: Go to next step
3. INSPECT KNOCK CONTROL SENSOR Inspect the knock control sensor. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NG --> See step 7 OK --> See step 6
4. 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 Tester Connection Condition Specified Condition F1-2 - D28-87 (KNK1) Always Below 1 ohms F1-1 - D28-110 (EKNK) Always Below 1 ohms F1-2 or D28-87 (KNK1) - Body ground Always 10 kohms or higher F1-1 or D28-110 (EKNK) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
5. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
7. REPLACE KNOCK CONTROL SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

The crankshaft position sensor system consists of a No. 1 crankshaft position sensor plate and a pickup coil.

The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of wound copper wire, an iron core and magnet. The sensor plate rotates and, as each tooth passes by the pickup coil, a pulse signal is created. The pickup coil generates 34 signals per engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine speed. Using these calculations, the fuel injection time and ignition timing are controlled.

Scheme 170

1. Reference: Inspection using an oscilloscope. Standard Tester Connection Tool Setting Condition Specified Condition D28-74 (NE+) - D28-120 (NE-) 5 V/DIV., 20 ms./DIV. Idling with warm engine The correct waveform is as shown HINT: NE is the crankshaft position sensor signal. A failure of the ground for the shielding of the wiring may result in noisy waveforms.

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

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

ALL

P0335: CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT (CASE 1)

P0335: CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT (CASE 2)

P0335: CRANKSHAFT POSITION SENSOR RANGE CHECK/RATIONALITY

P0335: CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT (CASE 1)

P0335: CRANKSHAFT POSITION SENSOR VERIFY PULSE INPUT (CASE 2)

P0335: CRANKSHAFT POSITION SENSOR RANGE CHECK/RATIONALITY

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine.
8. Idle the engine for 20 seconds or more [A].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0335.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 171

HINT

1. After performing the inspection procedure for the crankshaft position sensor, if DTC P0335 is output again, check the following items related to the camshaft position sensor. Installation condition of the camshaft position sensor Installation condition of the camshaft Connection of the camshaft position sensor connector
2. If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
3. Check the engine speed. The engine speed can be checked using the Techstream. To check, follow the operation below: Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / 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.
4. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 172

1. READ VALUE USING TECHSTREAM (ENGINE SPEED) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Engine Speed. Read the values displayed on the Techstream while the engine is running. OK 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 at zero (0), there may be an open or short in the crankshaft position sensor circuit. NG --> See step 2 OK --> See step 8
2. INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE) Inspect the crankshaft position sensor. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NG --> See step 9 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Disconnect the crankshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D27-1 (NE) - D28-74 (NE+) Always Below 1 ohms D27-2 (NE-) - D28-120 (NE-) Always Below 1 ohms D27-1 (NE) or D28-74 (NE+) - Body ground Always 10 kohms or higher D27-2 (NE-) or D28-120 (NE-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR) Check the crankshaft position sensor installation. OK Crankshaft position sensor is installed correctly. NG --> See step 10 OK: Go to next step
5. INSPECT NO. 1 CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE) Check the teeth of the No. 1 crankshaft position sensor plate. Refer to «COMPONENTS»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information) . OK Sensor plate does not have any cracks or deformation. NG --> See step 11 OK: Go to next step
6. REPLACE CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P0335 is output B HINT: If the engine does not start, replace the ECM. B --> See step 12 A --> END
8. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
9. REPLACE CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
10. SECURELY REINSTALL CRANKSHAFT POSITION SENSOR. Refer to «INSTALLATION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
11. REPLACE NO. 1 CRANKSHAFT POSITION SENSOR PLATE. Refer to «DISASSEMBLY - Step 29»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information)
12. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

The camshaft position sensor (G2 signal) consists of a magnet and MRE (Magneto Resistance Element).

The camshaft has a timing rotor for the camshaft position sensor. When the camshaft rotates, changes occur in the air gaps between the timing rotor and MR element, which affects the magnet. As a result, the resistance of the MRE material fluctuates. The camshaft position sensor converts the camshaft rotation data to pulse signals, and uses the pulse signals to determine the camshaft angle, which it sends to the ECM. Then the ECM uses this data to control fuel injection time and injection timing.

Scheme 173

1. Reference: Inspection using an oscilloscope. Standard Tester Connection Tool Setting Condition Specified Condition D28-76 (G2+) - D28-122 (G2-) 5 V/DIV., 20 ms./DIV. Idling with warm engine The correct waveform is as shown HINT: G2 is camshaft position sensor signal. DTC P0340 indicates a malfunction relating to the camshaft position sensor circuit (the wire harness between the ECM and camshaft position sensor, and the camshaft position sensor itself).

If no signal is transmitted by the camshaft position sensor despite the engine revolving, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

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

ALL

P0340: CAMSHAFT POSITION SENSOR VERIFY PULSE INPUT

P0342 AND P0343: CAMSHAFT POSITION SENSOR RANGE CHECK (LOW VOLTAGE, HIGH VOLTAGE)

P0340: CAMSHAFT POSITION SENSOR VERIFY PULSE INPUT

P0342: CAMSHAFT POSITION SENSOR RANGE CHECK (LOW VOLTAGE)

P0343: CAMSHAFT POSITION SENSOR RANGE CHECK (HIGH VOLTAGE)

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine.
8. Idle the engine for 10 seconds or more [A].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0340, P0342 or P0343.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0335. Refer to WIRING DIAGRAM .

HINT

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

Scheme 174

Scheme 175

1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF CAMSHAFT POSITION SENSOR) Disconnect the camshaft position sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D18-3 (VC) - Body ground Power switch on (IG) 4.5 to 5.0 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Camshaft Position Sensor) NG --> See step 9 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Disconnect the camshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D18-1 (VVI+) - D28-76 (G2+) Always Below 1 ohms D18-2 (VVI-) - D28-122 (G2-) Always Below 1 ohms D18-1 (VVI+) or D28-76 (G2+) - Body ground Always 10 kohms or higher D18-2 (VVI-) or D28-122 (G2-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR) Check the camshaft position sensor installation. OK Camshaft position sensor is installed correctly. NG --> See step 10 OK: Go to next step
4. INSPECT INTAKE CAMSHAFT (TIMING ROTOR) Check the timing rotor of the intake camshaft. OK Timing rotor does not have any cracks or deformation. NG --> See step 11 OK: Go to next step
5. REPLACE CAMSHAFT POSITION SENSOR Replace the camshaft position sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT: Go to next step
6. CHECK WHETHER DTC OUTPUT RECURS (P0340, P0342 OR P0343) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0340, P0342 or P0343 is output A DTC is not output B B --> END A: Go to next step
7. ADJUST VALVE TIMING See step 8 NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS (P0340, P0342 OR P0343) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P0340, P0342 or P0343 is output B HINT: If the engine does not start, replace the ECM. B --> See step 12 A --> END
9. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Disconnect the camshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D18-3 (VC) - D28-99 (VCV1) Always Below 1 ohms D18-3 (VC) or D28-99 (VCV1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 12
10. SECURELY REINSTALL CAMSHAFT POSITION SENSOR. Refer to «INSTALLATION»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
11. REPLACE INTAKE CAMSHAFT. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-mechanical-service-information)
12. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

HINT

1. These DTCs indicate malfunctions relating to the primary circuit.
2. If DTC P0351 is output, check the No. 1 ignition coil assembly circuit.
3. If DTC P0352 is output, check the No. 2 ignition coil assembly circuit.
4. If DTC P0353 is output, check the No. 3 ignition coil assembly circuit.
5. If DTC P0354 is output, check the No. 4 ignition coil assembly circuit.

A Direct Ignition System (DIS) is used on this vehicle.

The DIS is an ignition system in which each cylinder is ignited by it's own ignition coil assembly and spark plug. The secondary wiring of each ignition coil generates a powerful voltage which is applied directly to each spark plug. The spark passes from the center electrode of the spark plug to the ground electrode.

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

Scheme 176

Reference: Inspection using an oscilloscope.

Scheme 177

Standard

HINT

While idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF and E1 of the ECM connector.

Scheme 178

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

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

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine.
8. Idle the engine for 10 seconds or more [A].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0351, P0352, P0353 or P0354.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 179

Scheme 180

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

HINT

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

Scheme 181

1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL ASSEMBLY) Disconnect the ignition coil assembly connectors. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D23-1 (+B) - D23-4 (GND) Power switch on (IG) 11 to 14 V D22-1 (+B) - D22-4 (GND) Power switch on (IG) 11 to 14 V D21-1 (+B) - D21-4 (GND) Power switch on (IG) 11 to 14 V D20-1 (+B) - D20-4 (GND) Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Ignition Coil Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - IG2 RELAY) OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND) Disconnect the ignition coil assembly connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D23-4 (GND) - Body ground Always Below 1 ohms D22-4 (GND) - Body ground Always Below 1 ohms D21-4 (GND) - Body ground Always Below 1 ohms D20-4 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM) Disconnect the ignition coil assembly connectors. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D23-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D22-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D21-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D20-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D23-3 (IGT1) - D28-108 (IGT1) Always Below 1 ohms D22-3 (IGT2) - D28-107 (IGT2) Always Below 1 ohms D21-3 (IGT3) - D28-106 (IGT3) Always Below 1 ohms D20-3 (IGT4) - D28-105 (IGT4) Always Below 1 ohms D23-2 (IGF) or D28-23 (IGF1) - Body ground Always 10 kohms or higher D23-3 (IGT1) or D28-108 (IGT1) - Body ground Always 10 kohms or higher D22-3 (IGT2) or D28-107 (IGT2) - Body ground Always 10 kohms or higher D21-3 (IGT3) or D28-106 (IGT3) - Body ground Always 10 kohms or higher D20-3 (IGT4) or D28-105 (IGT4) - Body ground Always 10 kohms or higher D23-2 (IGF), D22-2 (IGF), D21-2 (IGF), D20-2 (IGF) or D28-23 (IGF1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Shuffle arrangement of the ignition coil assemblies (among No. 1 to No. 4 cylinders). NOTE: Do not shuffle the connectors. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to Same DTC output A Different ignition coil DTC output B B --> See step 5 A --> See step 6
5. REPLACE IGNITION COIL ASSEMBLY. Refer to «REMOVAL - Step 5»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

Based on the driving conditions, the ECM regulates the volume of exhaust gas that is recirculated to the engine's combustion chambers and thus lowers the combustion temperature to reduce NOx emissions. The ECM monitors signals such as engine speed, coolant temperature, electric load, and vehicle speed. When the EGR permission conditions are fulfilled, the ECM controls the opening of the EGR valve linearly through signals to the EGR step motor.

The ECM monitors the pressure inside the intake manifold while opening and closing the EGR valve during fuel cut operation. If there is no change in the manifold absolute pressure sensor value, the ECM interprets this as a malfunction in the EGR valve assembly, illuminates the MIL and stores the DTC (2 trip detection logic).

Refer to detailed information in Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

P0401: EXHAUST GAS RECIRCULATION / VVT / EGR FLOW INSUFFICIENCY

Scheme 182

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
8. Accelerate the vehicle to 60 km/h (37 mph) or more by depressing the accelerator pedal for at least 10 seconds [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: When accelerating the vehicle, depress the accelerator pedal more than normal to start the engine.
9. Idle the engine for 30 seconds or more [C].
10. Accelerate the vehicle to 60 km/h (37 mph) with the shift lever in B [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
11. Perform fuel cut operation for 5 seconds or more, with the accelerator pedal fully released [E]. HINT: When fuel cut is operating "Idle Fuel Cut" in Data List is ON.
12. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor [F].
13. Check that Exhaust Gas Recirculation/VVT / Current is Complete. HINT: If the monitor item Exhaust Gas Recirculation/VVT / Current is Incomplete, perform the driving pattern again.
14. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Exhaust Gas Recirculation / VVT / Details.
15. Check the Details (EGR FLOW INSUFFICIENCY). HINT: Make sure that the value is between MIN and MAX.
16. If the monitor item Exhaust Gas Recirculation/VVT / Current is still Incomplete, perform the following procedure.
17. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
18. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
19. Enter the following menus: Power train / Engine and ECT / Utility / All Readiness.
20. Input the DTC: P0401.
21. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the DTC judgment result is INCOMPLETE or N/A, perform steps [D] and [E] again.
22. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
2. When the engine is idling steadily with the EGR valve fully closed, if the EGR valve is normal and it is opened using the Active Test, the Data List value changes as follows. Data List Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test Engine Speed Idle becomes rough MAP Pressure rises
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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 183

Scheme 184

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0401) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTC. RESULT Result Proceed to DTC P0401 is output A DTC P0401 and other DTCs are output B HINT: If any DTCs other than P0401 are output, troubleshoot those DTCs first. B --> See step 12 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off and shift lever in P or N. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. NG --> See step 4 OK: Go to next step
3. INSPECT EGR VALVE ASSEMBLY Check if the EGR valve are clogged with deposits. Check if the EGR valve is closed. OK EGR valve is closed and no deposits. RESULT Result Proceed to NG A OK B B --> See step 5 A: Go to next step
4. REPLACE EGR VALVE ASSEMBLY Replace the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . NEXT: Go to next step
5. CHECK FOR DEPOSIT (INTAKE PORT TO EGR VALVE ASSEMBLY) Check for exhaust leaks at each connection point. Check for cracks, damage, and clogs in the pipes between the intake manifold and the EGR valve assembly. This check may require the removal of components. Check if there is a build-up of deposits in the EGR valve of pipes. OK No deposits. NG --> REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step
6. CHECK FOR DEPOSIT (EXHAUST MANIFOLD SUB-ASSEMBLY TO EGR VALVE ASSEMBLY) Check for exhaust leaks at each connection point. Check for cracks, damage, and clogs in the pipes between the exhaust manifold sub-assembly and the EGR valve assembly. This check may require the removal of components. Check if there is a build-up of deposits in the EGR valve of pipes. OK No deposits. NG --> REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step
7. INSPECT EGR WITH COOLER PIPE SUB-ASSEMBLY Check for blockage of the EGR with cooler pipe sub-assembly. NG --> REPLACE EGR WITH COOLER PIPE SUB-ASSEMBLY OK: Go to next step
8. READ VALUE USING TECHSTREAM (MANIFOLD ABSOLUTE PRESSURE SENSOR) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAP. Read the MAP value. Standard Condition Techstream Display Power switch on (IG) 80 to 110 kPa (600 to 825 mmHg) Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAP. Read the MAP value when idling the engine with the A/C switch and all accessory switches should be off and shift lever in P or N. Standard Engine Condition Techstream Display Idling Less than 80 kPa (600 mmHg) RESULT Result Proceed to NG A OK B B --> See step 11 A: Go to next step
9. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-v/i-2011-2014/remont/mechanical/#engine-intake-system-inspection) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
10. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Replace the manifold absolute pressure sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . NEXT: Go to next step
11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the power switch off and wait for 30 seconds. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. HINT: If the pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0401. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the pending DTC is not output and the DTC judgment result is INCOMPLETE or N/A, drive the vehicle again at 60 km/h (37 mph) with the shift lever in B, perform fuel cut operation for 5 seconds or more with the accelerator pedal fully released, and check the DTC judgment result. NEXT --> END
12. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)

Refer to DTC P0401. Refer to DESCRIPTION .

HINT

DTC P0403 is stored when the power switch is on (IG).

This DTC is designed to detect an open or short in the EGR valve assembly circuit.

Example

1. If the EGR1, EGR2, EGR3 or EGR4 terminal output voltage is excessively low, but the step motor is still operating, the ECM determines that there is a short in the EGR valve assembly circuit, and stores the DTC.
2. If the EGR1, EGR2, EGR3 or EGR4 terminal output voltage is excessively low, and the step motor is not operating, the ECM determines that there is an open in the EGR valve assembly circuit, and stores the DTC.

Scheme 185

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
7. Start the engine and warm it up [B].
8. Drive the vehicle at 20 km/h (12 mph) or more for 10 minutes [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0403.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows NORMAL, the system has a normal. If the judgment result shows ABNORMAL, the system has a malfunction.
14. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 186

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.

Scheme 187

1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. NG --> See step 2 OK --> See step 6
2. INSPECT EGR VALVE ASSEMBLY Inspect the EGR valve assembly. Refer to «INSPECTION»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . NG --> See step 7 OK: Go to next step
3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF EGR VALVE ASSEMBLY) Disconnect the EGR valve assembly connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D10-2 (+B1) - Body ground Power switch on (IG) 11 to 14 V D10-5 (+B2) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to EGR Valve Assembly) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EGR VALVE ASSEMBLY - EFI MAIN RELAY) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE ASSEMBLY) Disconnect the EGR valve assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D28-45 (EGR1) - D10-4 (EGR1) Always Below 1 ohms D28-44 (EGR2) - D10-3 (EGR2) Always Below 1 ohms D28-43 (EGR3) - D10-6 (EGR3) Always Below 1 ohms D28-42 (EGR4) - D10-1 (EGR4) Always Below 1 ohms D28-45 (EGR1) or D10-4 (EGR1) - Body ground Always 10 kohms or higher D28-44 (EGR2) or D10-3 (EGR2) - Body ground Always 10 kohms or higher D28-43 (EGR3) or D10-6 (EGR3) - Body ground Always 10 kohms or higher D28-42 (EGR4) or D10-1 (EGR4) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. CHECK DTC OUTPUT RECORDS (DTC P0403) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P0403 is output B B --> See step 8 A --> END
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
7. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information)

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

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

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

The oxygen storage capacity value is an indication of the oxygen storage capacity of the three-way catalytic converter. When the vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 15 to 25 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If the cycle of the waveform for the heated oxygen sensor is long, the oxygen storage capacity is great. There is a direct correlation between the heated oxygen sensor and the oxygen storage capacity of the three-way catalytic converter.

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

This system determines the deterioration of the entire catalyst system (including the front and rear catalysts), by using the oxygen storage capacity value of the front catalyst, that is more sensitive than the rear catalyst, as the representative value. Therefore, be sure to replace the front and rear catalysts together when catalyst replacement is necessary.

Scheme 188

TEXT IN ILLUSTRATION

Note. When replacing the front exhaust pipe assembly in order to replace the three-way catalytic converter, it is not necessary to replace the heated oxygen sensor.

Refer to detailed information in Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

P0420: CATALYST EFFICIENCY / O2 STORAGE B1

HINT

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

Scheme 189

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
5. Turn the power switch off and wait for at least 30 seconds.
6. Turn the power switch on (IG) and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor.
8. Check that Catalyst Efficiency / Current is Incomplete.
9. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) .
10. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
11. Drive the vehicle at approximately 60 to 100 km/h (37 to 62 mph) for 10 minutes or more [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: Drive the vehicle while keeping the engine load as constant as possible. The monitor item will change to Complete as the Catalyst Efficiency monitor operates [C].
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
13. Check if any DTCs (pending DTCs) are stored. HINT: If the monitor does not change to Complete, and no pending DTCs are stored, perform the following procedure.
14. Drive the vehicle at a speed between 75 and 100 km/h (47 and 62 mph) for 10 minutes or more [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: Drive the vehicle while keeping the engine load as constant as possible. The monitor item will change to Complete as the Catalyst Efficiency monitor operates [E].
15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
16. Check if any DTCs (pending DTCs) are stored.

CONDITIONING FOR SENSOR TESTING

HINT

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

Scheme 190

1. (a) Connect the Techstream to the DLC3 [A].
2. (b) Turn the power switch on (IG) and turn the Techstream on [B].
3. (c) Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) [C].
4. (d) Start the engine and warm it up with all the accessories switched off until the engine coolant temperature stabilizes [D].
5. (e) Run the engine at an engine speed of 2500 RPM for at least 3 minutes [E]. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, perform step [E] after charging control has completed.
6. (f) While running the engine at 2500 RPM for 2 seconds and 1500 RPM for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream [F].

HINT

1. If either of the voltage outputs of the air fuel ratio or heated oxygen sensor does not fluctuate, or there is noise in the waveform of either sensor, the sensor may be malfunctioning.
2. If the voltage outputs of both the sensors remain lean or rich, the air fuel ratio may be extremely lean or rich. In such cases, perform the Control the Injection Volume Active Test using the Techstream.
3. If the three-way catalytic converter has deteriorated, the heated oxygen sensor (located behind the three-way catalytic converter) voltage output fluctuates up and down frequently, even under normal driving conditions (active air fuel ratio control is not performed).

Scheme 191

HINT

1. Sensor 1 refers to the sensor closest to the engine assembly.
2. Sensor 2 refers to the sensor farthest away from the engine assembly.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0420 is output A DTC P0420 and other DTCs are output B HINT: If any DTCs other than P0420 are output, troubleshoot those DTCs first. B --> See step 17 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine warm it up. Run up the engine at an engine speed of 2500 RPM for approximately 90 seconds. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, warm up the engine after charging control has completed. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Data List / Gas AF Control / AFS Voltage B1S1 and O2S B1S2. 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 sensor and heated oxygen sensor (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream. HINT: Change the fuel injection volume within the range of -12% to +12%. The injection volume can be changed in fine gradations. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning. Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) +12% Rich Below 3.1 V AFS Voltage B1S1 (Air fuel ratio) -12% Lean Higher than 3.4 V O2S B1S2 (Heated oxygen) +12% Rich Higher than 0.55 V O2S B1S2 (Heated oxygen) -12% Lean Below 0.4 V RESULT Status of AFS Voltage B1S1 Status of O2S B1S2 Air Fuel Ratio Condition and Air Fuel Ratio and Heated Oxygen Sensor Condition Misfire Suspected Trouble Area Proceed to Lean/Rich Lean/Rich Normal - Tree-way catalytic converter Gas leaks from exhaust system EGR valve assembly 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/Rich Lean Heated oxygen sensor malfunction - Heated oxygen sensor Gas leaks from exhaust system C Lean/Rich Rich Heated oxygen sensor malfunction - Heated oxygen sensor Gas leaks from exhaust system C Lean Lean Actual air fuel ratio lean May occur Extremely rich or lean actual air fuel ratio Gas leaks from exhaust system EGR valve assembly D Rich Rich Actual air fuel ratio rich - Extremely rich or lean actual air fuel ratio Gas leaks from exhaust system EGR valve assembly D Lean: During the Control the Injection Volume Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently below 0.4 V. Rich: During the Control the Injection Volume Active Test, the AFS Voltage is consistently below 3.1 V, and the O2S is consistently higher than 0.55 V. Lean/Rich: During the Control the Injection Volume Active Test, the output voltage of the heated oxygen sensor alternates correctly. B --> See step 7 C --> See step 8 D --> See step 10 A: Go to next step
3. CHECK FOR EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks. NG --> See step 14 OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. Result Result Proceed to Outside of standard range A Within standard range B B --> See step 6 A: Go to next step
5. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 18 OK: Go to next step
6. REPLACE FRONT EXHAUST PIPE ASSEMBLY (TWC: FRONT AND REAR CATALYST) NOTE: When replacing the front exhaust pipe assembly in order to replace the three-way catalytic converter, it is not necessary to replace the heated oxygen sensor. HINT: Confirm the replacement parts, referring to the illustration in the Catalyst Location. Replace the front exhaust pipe assembly (TWC: Front and rear catalyst). Refer to «REMOVAL - Step 6»(/toyota/prius-v/i-2011-2014/remont/exhaust/#exhaust-system-service-information) . NEXT --> END
7. REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) Replace the air fuel ratio sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT --> See step 15
8. CHECK FOR EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks. NG --> See step 14 OK: Go to next step
9. REPLACE HEATED OXYGEN SENSOR (SENSOR 2) Replace the heated oxygen sensor. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-service-information) . NEXT --> See step 15
10. CHECK FOR EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks. NG --> See step 14 OK: Go to next step
11. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / Primary / MAP. Check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. Result Result Proceed to Outside of standard range A Within standard range B B --> See step 13 A: Go to next step
12. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 18 OK: Go to next step
13. CHECK CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO Check the case of extremely rich or lean actual air fuel ratio, referring to the DTC P0171 Inspection Procedure. Refer to «INSPECTION PROCEDURE»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostic-codes) . NEXT --> See step 15
14. REPAIR OR REPLACE EXHAUST GAS LEAK POINT Repair or replace exhaust gas leak point. NEXT: Go to next step
15. CHECK WHETHER DTC OUTPUT RECURS (P0420) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the power switch off and wait for at least 30 seconds. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0420 is output A DTC is not output (No pending DTCs output) B B --> END A: Go to next step
16. REPLACE FRONT EXHAUST PIPE ASSEMBLY (TWC: FRONT AND REAR CATALYST) NOTE: When replacing the front exhaust pipe assembly in order to replace the three-way catalytic converter, it is not necessary to replace the heated oxygen sensor. HINT: Confirm the replacement parts, referring to the illustration in the Catalyst Location. Replace the front exhaust pipe assembly (TWC: Front and rear catalyst). Refer to «REMOVAL - Step 6»(/toyota/prius-v/i-2011-2014/remont/exhaust/#exhaust-system-service-information) . NEXT --> END
17. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
18. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-v/i-2011-2014/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)

DTC SUMMARY

HINT

The reference orifice is located inside the canister pump module.

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

5 hours*1 after the power switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT

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

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

Scheme 192

TEXT IN ILLUSTRATION

The leak detection pump creates negative pressure through the reference orifice (in operation B and E). When the system is normal, the EVAP pressure is 97 to 100 kPa (abs) [728 to 750 mmHg (abs)]* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM illuminate the MIL and stores a DTC if this malfunction is detected in consecutive drive cycles.

*: Typical value

Scheme 193

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

Refer to EVAP System. Refer to MONITOR RESULT .

Note. The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
7. After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All readiness.
8. Input the DTC: P043E, P043F, P2401, P2402 or P2419.
9. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
10. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-v/i-2011-2014/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

See also:
• DTC CHECK / CLEAR
• INSPECTION MODE PROCEDURE
• INSPECTION
• REMOVAL
• REMOVAL
• CHECK FOR INTERMITTENT PROBLEMS
• CHECKING MONITOR STATUS
• DISASSEMBLY - Step 31
• DIAGNOSTIC TROUBLE CODE CHART
• DESCRIPTION
• DATA LIST / ACTIVE TEST
• ON-VEHICLE INSPECTION
• COMPONENTS
• INSPECTION
• READINESS MONITOR DRIVE PATTERN
• ON-VEHICLE INSPECTION - Step 2
• ON-VEHICLE INSPECTION - Step 1
• INSPECTION
• CHECK MODE PROCEDURE
• REMOVAL - Step 6
• DESCRIPTION
• WIRING DIAGRAM
• INSPECTION PROCEDURE