Engine Control (sfi) System (diagnostic Codes (p0010-p0171)) (except Phv) Toyota Prius PHV pre-III

DESCRIPTION

The VVT (variable valve timing) system adjusts the intake valve timing to improve driveability. The engine oil pressure turns the VVT controller 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 242

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's duty-cycle is excessively high or low while the engine is running, the ECM will illuminate the MIL and set the DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

Scheme 243

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 [A].
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the DTC [B].
9. If a DTC is output, the system is malfunctioning. HINT: If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0010.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [A] again.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 244

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 245

Scheme 246

Scheme 247

1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine. Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) HINT: If the result is not acceptable, cool the engine and perform the Active Test again. Start the engine when the engine coolant temperature is 30°C (86°F) or less. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly (for intake camshaft) using the Techstream with the engine coolant temperature is 50°C (122°F) or less. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) NG --> See step 2 OK --> See step 6
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Remove the camshaft timing oil control valve assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 6.9 to 7.9 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Camshaft Timing Oil Control Valve Assembly) Connect the positive (+) battery terminal to terminal 1 and connect the negative (-) battery terminal to terminal 2. Check the valve operation. OK Valve moves quickly. Reinstall the camshaft timing oil control valve assembly. NG --> See step 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 (Check for Open) Tester Connection Condition Specified Condition D25-1 (+) - D28-36 (OC1+) Always Below 1 ohms D25-2 (-) - D28-59 (OC1-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 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 TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Camshaft Timing Oil Control Valve Assembly) *2 Front view of wire harness connector (to ECM) Reconnect the camshaft timing oil control valve assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY - ECM) OK --> See step 4
4. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
5. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv__removal)
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 VVT controller. 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 VVT controller. The VVT controller 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 VVT controller stuck malfunction and sets a DTC.

1. Example
2. A DTC is set 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. The monitor will run if all of the following conditions are met
4. DTC P0011 (Advanced Cam Timing) is subject to 1 trip detection logic.
5. DTC P0012 (Retarded Cam Timing) is subject to 2 trip detection logic.
6. These DTCs indicate that the VVT controller 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. The engine is warm (the engine coolant temperature is 75°C (167°F) or more). The vehicle has been driven at 47 mph (75 km/h) or more. The engine has idled for 30 seconds or more.

ADVANCED CAMSHAFT TIMING

RETARDED CAMSHAFT TIMING

If the difference between the target and actual camshaft timing is greater than the specified value, the ECM operates the VVT actuator (camshaft timing oil control valve assembly).

Then, the ECM monitors the camshaft timing change for 10 seconds.

MONITOR RESULT

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

Scheme 248

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more [B].
8. Accelerate the vehicle to 47 mph (75 km/h) or more for 10 seconds or more [C].
9. Idle the engine for 30 seconds or more [D].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
11. Read the pending DTC [E].
12. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0011 or P0012.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [F] through [H].
16. Accelerate the vehicle to 47 mph (75 km/h) or more for 10 seconds or more [F].
17. Idle the engine for 30 seconds or more [G].
18. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
19. Input the DTC: P0011 or P0012.
20. Check the DTC judgment result again [H]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
21. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 .

Note. DTC P0011 or P0012 may be set when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain set even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.

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 249

Scheme 250

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 (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine. Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) HINT: If the result is not acceptable, cool the engine and perform the Active Test again. Start the engine when the engine coolant temperature is 30°C (86°F) or less. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream with the engine coolant temperature at 50°C (122°F) or less. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Driving 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 8 A --> See step 4
4. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__check-for-intermittent-problems)
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Remove the camshaft timing oil control valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv__removal) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 6.9 to 7.9 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Camshaft Timing Oil Control Valve Assembly) Connect the positive (+) battery terminal to terminal 1 and connect the negative (-) battery terminal to terminal 2. Check the valve operation. OK Valve moves quickly. Reinstall the camshaft timing oil control valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv__installation) . NG --> See step 11 OK: Go to next step
6. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (FOR INTAKE CAMSHAFT) Inspect the camshaft timing gear assembly (for intake camshaft). Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv) . NG --> See step 13 OK: Go to next step
7. INSPECT OIL CONTROL VALVE FILTER Remove the oil control valve filter. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv) . Check that the filter is not clogged. OK Filter is not clogged. Reinstall the oil control valve filter. Refer to «REASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv) . 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 «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv) . TEXT IN ILLUSTRATION *1 Top *2 Alignment Mark *3 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
11. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv__removal)
12. REPLACE OIL CONTROL VALVE FILTER. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv)
13. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (FOR INTAKE CAMSHAFT). Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv)
14. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

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 VVT controller (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 VVT controller. The VVT controller 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 sets the DTC P0016.

This DTC indicates that the intake camshaft has been installed toward the crankshaft at an incorrect angle, caused by factors such as the timing chain having jumped a tooth.

This monitor begins to run after the engine has idled for 5 minutes.

Scheme 251

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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 / Pending.
10. Read the pending DTC [D].
11. If a pending DTC is output, the system is malfunctioning. HINT: 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: P0016.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [E] through [G].
15. Drive the vehicle at 47 mph (75 km/h) for 2 to 3 minutes [E].
16. Idle the engine for 5 minutes or more [F].
17. Check the DTC judgment result [G]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. 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.

PROCEDURE

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 9 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine. Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) HINT: If the result is not acceptable, cool the engine and perform the Active Test again. Start the engine when the engine coolant temperature is 30°C (86°F) or less. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream with the engine coolant temperature at 50°C (122°F) or less. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) NG --> See step 4 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Driving 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 7 A --> CHECK FOR INTERMITTENT PROBLEMS
4. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Remove the camshaft timing oil control valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv__removal) . Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 6.9 to 7.9 ohms TEXT IN ILLUSTRATION *1 Component without harness connected (Camshaft Timing Oil Control Valve Assembly) Connect the positive (+) battery terminal to terminal 1 and connect the negative (-) battery terminal to terminal 2. Check the valve operation. OK Valve moves quickly. Reinstall the camshaft timing oil control valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv__installation) . NG --> See step 10 OK: Go to next step
5. INSPECT CAMSHAFT TIMING GEAR ASSEMBLY Inspect the camshaft timing gear assembly (for intake camshaft). Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv) . NG --> See step 11 OK: Go to next step
6. INSPECT OIL CONTROL VALVE FILTER Remove the oil control valve filter. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv) . Check that the filter is not clogged. OK Filter is not clogged. Reinstall the oil control valve filter. Refer to «REASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv) . NG --> See step 12 OK: Go to next step
7. 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 «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv) . TEXT IN ILLUSTRATION *1 Top *2 Alignment Mark *3 No. 1 Cylinder at TDC Compression NEXT: Go to next step
8. 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine 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 13 A --> END
9. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
10. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv__removal)
11. REPLACE CAMSHAFT TIMING GEAR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv)
12. REPLACE OIL CONTROL VALVE FILTER. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-except-phv)
13. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

Refer to DTC P2195. Refer to DESCRIPTION .

HINT

Scheme 252

1. When either of these DTCs is set, the ECM enters fail-safe mode. The ECM turns off the air fuel ratio sensor heater in fail-safe mode. Fail-safe mode continues until the 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.

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.

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 sets a DTC.

P0031

P0032

P101D

P0031

P0032

P101D

P0031

P0032

P101D

Scheme 253

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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].
9. Idle the engine for 5 minutes or more [D].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
11. Read the DTC [E].
12. If a DTC is output, the system is malfunctioning. HINT: If a DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0031, P0032, or P101D.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] through [D] again.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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

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 254

Scheme 255

Scheme 256

1. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Disconnect the air fuel ratio sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA1A) - 4 (A1A-) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (to Air Fuel Ratio Sensor) Reconnect the air fuel ratio sensor connector. NG --> See step 5 OK: Go to next step
2. CHECK TERMINAL VOLTAGE (POWER SOURCE) 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 Switch Condition Specified Condition D24-2 (+B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Air Fuel Ratio Sensor) Reconnect the air fuel ratio sensor connector. 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 (Check for Open) Tester Connection Condition Specified Condition D24-1 (HA1A) - D28-18 (HA1A) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D24-1 (HA1A) or D28-18 (HA1A) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Air Fuel Ratio Sensor) *2 Front view of wire harness connector (to ECM) Reconnect the air fuel ratio sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM) OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0031 OR P0032) 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine. Allow the engine to idle for 5 minutes or more. 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-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__check-for-intermittent-problems)

Refer to DTC P0136. Refer to DESCRIPTION .

HINT

Scheme 257

1. Sensor 2 refers to the sensor mounted behind the three-way catalytic converter and located far from the engine assembly.
2. When any of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the heated oxygen sensor heater in fail-safe mode. Fail-safe mode continues until the 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.

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.

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 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 (CASE 1)

P0141 (CASE 2)

P102D

P0037 (CASE 1)

P0037 (CASE 2)

P0038

P0141

P102D

1. Refer to Checking Monitor Status. Refer to «CHECKING MONITOR STATUS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__checking-monitor-status) .

Scheme 258

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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].
9. Idle the engine for 5 minutes or more [D].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
11. Read the pending DTC [E].
12. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0037, P0038, P0141, or P102D.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] through [D] again.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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

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 259

Scheme 260

Scheme 261

1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the heated oxygen sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT1B) - 4 (E2) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Heated Oxygen Sensor (Sensor 2)) Reconnect the heated oxygen sensor connector. NG --> See step 5 OK: Go to next step
2. CHECK TERMINAL VOLTAGE (POWER SOURCE) 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 Switch Condition Specified Condition D9-2 (+B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of harness connector (to Heated Oxygen Sensor (Sensor 2)) Reconnect the heated oxygen sensor connector. 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 (Check for Open) Tester Connection Condition Specified Condition D9-1 (HT1B) - D28-41 (HT1B) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D9-1 (HT1B) or D28-41 (HT1B) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of harness connector (to Heated Oxygen Sensor (Sensor 2)) *2 Front view of harness connector (to ECM) Reconnect the heated oxygen sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM) OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0037, P0038, P0141 OR P0101D) 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine. 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-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 set.

Refer to DTC P0102. Refer to WIRING DIAGRAM .

Scheme 262

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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 50 mph (80 km/h) to 70 mph (112 km/h) for 5 minutes or more [B]. HINT: Drive while keeping the engine load as stable as possible.
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
11. Read the pending DTC [C].
12. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0101.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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-phv/pre-iii-2010-2011/remont/mechanical/#intake-inspection-except-phv) . 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. OK PCV hose is connected correctly and is 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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. 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. Confirm the Throttle Idle Position is ON and 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 when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling 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-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. Reinstall the EGR valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv__installation) . 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-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . 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 DTC. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
9. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv)

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

Scheme 263

HINT

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

Example

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

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

P0102

P0103

Scheme 264

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
7. Start the engine.
8. Idle the engine for 5 seconds [B].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
10. Read the DTC [C].
11. If a DTC is output, the system is malfunctioning. HINT: If a DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
13. Input the DTC: P0102 or P0103.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 265

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 266

Scheme 267

Scheme 268

Scheme 269

Scheme 270

1. READ DTC OUTPUT 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. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY (POWER SOURCE VOLTAGE) 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 Switch Condition Specified Condition D5-3 (+B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) Reconnect the mass air flow meter sub-assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI MAIN RELAY - MASS AIR FLOW METER SUB-ASSEMBLY) 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 (Check for Open) Tester Connection Condition Specified Condition D5-5 (VG) - D28-94 (VG) Always Below 1 ohms D5-4 (E2G) - D28-117 (E2G) Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D5-5 (VG) or D28-94 (VG) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) *2 Front view of wire harness connector (to ECM) Reconnect the mass air flow meter sub-assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) OK: Go to next step
4. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY Perform On-vehicle inspection. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . Perform Inspection. Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . Inspect the function of the mass air flow meter sub-assembly. Remove the mass air flow meter sub-assembly with the connector connected. 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 / MAF. Blow air to the mass air flow meter sub-assembly and check that the intake air amount reading changes. 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 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 TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) Reconnect the mass air flow meter sub-assembly connector. 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 (Check for Open) Tester Connection Condition Specified Condition D5-4 (E2G) - D28-117 (E2G) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) *2 Front view of wire harness connector (to ECM) Reconnect the mass air flow meter sub-assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) OK --> See step 8
7. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
8. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

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 EGR, purge VSV, and detects errors in the pressure sensor using the changes in pressure.

Scheme 271

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 atmospheric pressure drops below the intake manifold pressure by 3 kPa (22.5 mmHg) or more, the ECM interprets this as a malfunction in the manifold absolute pressure sensor and sets P0106.

Scheme 272

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
7. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or higher) [B].
8. Move the shift lever to N.
9. Idle the engine for 10 seconds or more [C].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
11. Read Pending DTC [D].
12. If the pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0106.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [C] again.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP. Read the MAP value at idling and 2500 rpm. Standard Engine condition Tester Display Power switch on (IG) 80 to 110 kPa Idling 28 to 48 kPa 2500 rpm 22 to 50 kPa 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-phv/pre-iii-2010-2011/remont/mechanical/#intake-inspection-except-phv) . 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-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv)
5. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__check-for-intermittent-problems)
6. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 EGR, purge VSV, and corrects any errors in the pressure sensor due to changes in pressure.

Scheme 273

HINT

1. DTC P0107 and P0108 are detected when the power switch is on (IG) for approximately 5 seconds.
2. When DTC P0107 or P0108 is detected, check the manifold absolute pressure by selecting Powertrain / Engine and ECT / Data List / 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 sets a DTC.

Example

When the sensor output voltage remains less than 0.5 V, or more than 4.5 V for 0.5 seconds, the ECM sets a DTC.

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

P0107

P0108

Scheme 274

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Wait 5 seconds.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the DTC [B].
9. If a DTC is output, the system is malfunctioning. HINT: If a 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 UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [A] again.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 275

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 276

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 / MAP. Read the MAP value. OK Same value as the actual atmospheric pressure. HINT: Standard atmospheric pressure is 101 kPa. For every 100 m (328 ft.) increase in altitude, pressure drops by 1 kPa. 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 (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 Switch 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) 4.0 to 5.0 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Manifold Absolute Pressure Sensor) Reconnect the manifold absolute pressure sensor connector. Result Result Proceed to Outside 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 (Check for Open) Tester Connection Condition Specified Condition D3-3 (VC) - D28-72 (VCPM) Always Below 1 ohms D3-2 (E2) - D28-71 (EPIM) D3-1 (PIM) - D28-69 (PIM) Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D3-3 (VC) or D28-72 (VCPM) - Body ground Always 10 kohms or higher D3-2 (E2) or D28-71 (EPIM) - Body ground D3-1 (PIM) or D28-69 (PIM) - Body ground Reconnect the manifold absolute pressure sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MANIFOLD ABSOLUTE PRESSURE SENSOR - ECM) OK --> See step 6
4. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Replace the manifold absolute pressure sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . 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 DTC and turn the power switch off. Turn the power switch on (IG) and wait for 5 seconds. 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-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
7. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__check-for-intermittent-problems)

Scheme 277

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 242)(Scheme 242) ).
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 set.

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 set.

ALL

AFTER ENGINE STOP

AFTER COLD ENGINE START

AFTER ENGINE STOP

AFTER COLD ENGINE START

Scheme 278

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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 (2°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 / Pending.
10. Read the pending DTC [D].
11. If a pending DTC is output, the system is malfunctioning. HINT: 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: P0111.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [E] and [F].
15. Drive the vehicle at 25 mph (40 km/h) or more for a total of 5 minutes or more [E].
16. Check the DTC judgment result again [F].
17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
18. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
19. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 .

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
3. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

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 242)(Scheme 242) ).
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 set, the ECM enters fail-safe mode. During fail-safe mode, the intake air temperature is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

HINT

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

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

Example

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

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

P0112

P0113

Scheme 279

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 [A].
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the DTC [B].
9. If a DTC is output, the system is malfunctioning. HINT: If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0112 or P0113.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [A] again.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 280

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 281

Scheme 282

Scheme 283

Scheme 284

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 / 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 140°C (284°F) B Same as actual intake air temperature C HINT: If there is an open circuit, the Techstream indicates -40°C (-40°F). If there is a short circuit, the Techstream indicates 140°C (284°F). C --> See step 4 B --> See step 7 A: Go to next step
2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) Confirm good connection at the mass air flow meter sub-assembly. TEXT IN ILLUSTRATION *1 Mass Air Flow Meter Sub-assembly *2 ECM *3 Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) - - Disconnect the mass air flow meter sub-assembly connector. Connect terminals THA and 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 / Intake Air. Read the value displayed on the Techstream. Standard 140°C (284°F) Reconnect the mass air flow meter sub-assembly connector. 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 (Check for Open) 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 TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) *2 Front view of wire harness connector (to ECM) Reconnect the mass air flow meter sub-assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) OK --> See step 6
4. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__check-for-intermittent-problems)
5. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
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 / Intake Air. Read the value displayed on the Techstream. Standard value -40°C (-40°F) Reconnect the mass air flow meter sub-assembly connector. 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 (Check for Short) Tester Connection Condition Specified Condition D5-1 (THA) or D28-116 (THA) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Mass Air Flow Meter Sub-assembly) *2 Front view of wire harness connector (to ECM) Reconnect the mass air flow meter sub-assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) OK --> See step 10
9. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
10. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

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 set, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

HINT

When any of these DTCs are set, check the engine coolant temperature by entering the following menus: Powertrain / Engine and ECT / Data List / 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 sets a DTC.

Example

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

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

P0115

P0117

P0118

Scheme 285

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 [A].
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the DTC [B].
9. If a DTC is output, the system is malfunctioning. HINT: If a DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0115, P0117 or P0118.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [A] again.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
15. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 286

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 287

Scheme 288

Scheme 289

Scheme 290

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 / Coolant Temp. Read the value displayed on the Techstream. Standard value Between 80°C and 100°C (167°F and 212°F) with warm engine. Result Result Proceed to -40°C (-40°F) A 140°C (284°F) or more B Between 80°C and 100°C (176°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 140°C (284°F) or more. C --> See step 4 B --> See step 7 A: Go to next step
2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) Confirm good connection at the engine coolant temperature sensor connector. TEXT IN ILLUSTRATION *1 Engine Coolant Temperature Sensor *2 ECM *3 Front view of wire harness connector (to Engine Coolant Temperature Sensor) - - Disconnect the engine coolant temperature sensor connector. Connect terminals THW and E2 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 / Coolant Temp. Read the value displayed on the Techstream. Standard 140°C (284°F) or more Reconnect the engine coolant temperature sensor connector. NG --> See step 3 OK --> See step 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 (Check for Open) Tester Connection Condition Specified Condition D6-2 (THW) - D28-64 (THW) Always Below 1 ohms D6-1 (E2) - D28-65 (ETHW) Always Below 1 ohms TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Engine Coolant Temperature Sensor) *2 Front view of wire harness connector (to ECM) Reconnect the engine coolant temperature sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) OK --> See step 6
4. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__check-for-intermittent-problems)
5. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
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 / Coolant Temp. Read the value displayed on the Techstream. Standard value -40°C (-40°F) Reconnect the engine coolant temperature sensor connector. 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 (Check for Short) Tester Connection Condition Specified Condition D6-2 (THW) or D28-64 (THW) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Engine Coolant Temperature Sensor) *2 Front view of wire harness connector (to ECM) Reconnect the engine coolant temperature sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM) OK --> See step 10
9. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
10. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

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 set.

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 set.

Engine Coolant Temperature Sensor High Side Stuck Monitor (only for Mexico models)

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

Examples

1. Upon starting the engine, the engine coolant temperature is between 35°C and 60°C (95°F and 140°F). If after driving for 250 seconds, the engine coolant temperature remains within 3°C (5.4°F) of the starting temperature, the DTC is set (2 trip detection logic).
2. Upon starting the engine, the engine coolant temperature is over 60°C (140°F). If after driving for 250 seconds, the ECM remains within 1°C (1.8°F) of the starting temperature, the DTC is set (6 trip detection logic).

ENGINE COOLANT TEMPERATURE SENSOR COLD START MONITOR

ENGINE COOLANT TEMPERATURE SENSOR SOAK MONITOR

ENGINE COOLANT TEMPERATURE SENSOR COLD START MONITOR

ENGINE COOLANT TEMPERATURE SENSOR SOAK MONITOR

Scheme 291

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 / All Data / 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Start the engine and idle it for 5 minutes or more [B]. HINT: If the engine coolant temperature does not change by 5°C (9°F) or higher, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
10. Read the pending DTC [C].
11. If a pending DTC is output, the system is malfunctioning. HINT: 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 UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] and [E].
15. Drive the vehicle at 25 mph (40 km/h) or more for a total of 5 minutes or more [D]. 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 ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116) Connect the Techstream to the DLC3. Turn the 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 Remove the water inlet with thermostat sub-assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv) . Measure the valve opening temperature of the water inlet with thermostat sub-assembly. Standard value 80 to 84°C (176 to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard. Reinstall the water inlet with thermostat sub-assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv) . NG --> See step 4 OK --> See step 5
3. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
4. REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv)
5. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

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 292

HINT

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

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

The ECM monitors the difference between the engine coolant temperature and the intake air temperature when the engine is started cold to detect the engine temperature conditions accurately. The monitor runs when the engine started cold after 7 hours or more has elapsed since the engine was stopped (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 sets the DTC.

Scheme 293

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
8. Start the engine and wait 60 seconds or more [C].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
10. Read the pending DTC [D].
11. If a pending DTC is output, the system is malfunctioning. HINT: 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: P011B.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [A] through [C] again.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 TEMPERATURE) Leave the vehicle for 7 hours or more. HINT: It is necessary to leave the vehicle for 7 hours or more to allow conditions similar to the DTC detection conditions. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / 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 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 / 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
5. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
7. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

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 294

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

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

1. A specific voltage difference is expected between the sensor terminals, 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 sets 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 sets 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 sets a DTC.

If the malfunction is not repaired successfully, a DTC is set 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, P2135

P0121

P0120

P0121

P0122

P0123

P0220

P0222

P0223

P2135 CASE 1

P2135 CASE 2

Scheme 295

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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.
11. Read the DTC [D].
12. If a DTC is output, the system is malfunctioning. HINT: If a DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0120, P0121, P0122, P0123, P0220, P0222, P0223 or P2135.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] and [C] again.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

FAIL-SAFE

When any of these DTCs, as well as other DTCs relating to electronic throttle control system malfunctions, are set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 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 296

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. Features of sensor output VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V VTA1: Throttle Position No. 1 VTA2: Throttle position No. 2
2. If DTC P0121 is output, proceed to "CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)".
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 297

Scheme 298

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 (Check for Open) 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 Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 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 TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Throttle Body Assembly) *2 Front view of wire harness connector (to ECM) Reconnect the throttle body assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE POSITION SENSOR - ECM) 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 *1 Front view of wire harness connector (to Throttle Body Assembly) Reconnect the throttle body assembly connector. NG --> See step 5 OK: Go to next step
3. REPLACE THROTTLE BODY ASSEMBLY Replace the throttle body assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine. 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-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

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 sets the DTC.

Example

The engine coolant temperature is 5°C (41°F) at engine start. After about 1 minute running time, the engine coolant temperature sensor still indicates that the engine is not warm enough to begin closed-loop fuel (air fuel ratio feedback) control. The ECM interprets this as a malfunction in the sensor or cooling system and sets the DTC.

Scheme 299

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 / 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 [A].
9. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
10. Start the engine.
11. After starting the engine, wait 21 minutes or more [B].
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
13. Read the pending DTC [C].
14. If a pending DTC is output, the system is malfunctioning. HINT: 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: P0125.
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 UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
18. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
19. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
20. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0115. Refer to WIRING DIAGRAM .

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0125) Connect the Techstream to the DLC3. Turn the 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 Remove the water inlet with thermostat sub-assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv) . Check the valve opening temperature of the water inlet with thermostat sub-assembly. Standard value 80 to 84°C (176 to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard. Reinstall the water inlet with thermostat sub-assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv) . 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
5. REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv)
6. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

HINT

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

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

Scheme 300

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

Scheme 301

1. Stop the engine and allow it to cool down.
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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) .
5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / 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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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 50 mph (80 km/h) 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 / Snap-shot configuration / Record time / 5 min. Data capture can be started by using the target point. For example, setting the target point to an Accel of 90% and then racing the engine, etc. to raise the engine speed to a speed of 2500 rpm or more will cause data capture to start.
10. After driving the vehicle at 50 mph (80 kmh) 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 50 mph (80 km/h), inspect the cooling system and thermostat.

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128) Connect the Techstream to the DLC3. Turn the 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 Remove the water inlet with thermostat sub-assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv) . Measure the valve opening temperature of the water inlet with thermostat. Standard value 80 to 84°C (176 to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard. Reinstall the water inlet with thermostat sub-assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv) . NG --> See step 5 OK --> See step 6
4. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
5. REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-except-phv)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)

HINT

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

In order to obtain a high purification rate of the carbon monoxide (CO), 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. less than 0.45 V).

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

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

Scheme 302

FOR MEXICO MODELS

Scheme 303

Scheme 304

Scheme 305

1. Active Air Fuel Ratio Control The ECM usually performs air fuel ratio feedback control so that the air fuel ratio sensor output indicates a near stoichiometric air fuel level. This vehicle includes active air fuel ratio control in addition to regular air fuel ratio control. The ECM performs active air fuel ratio control to detect any deterioration in the three-way catalytic converter and heated oxygen sensor malfunctions (refer to the diagram below). Active air fuel ratio control is performed for approximately 15 to 25 seconds while driving with a warm engine. During active air fuel ratio control, the air fuel ratio is forcibly regulated to become lean or rich by the ECM. If the ECM detects a malfunction, a DTC is set.
2. Abnormal Voltage Output of Heated Oxygen Sensor (DTC P0136) While the ECM is performing active air fuel ratio control, the air fuel ratio is forcibly regulated to become rich or lean. If the sensor is not functioning properly, the voltage output variation is small. For example, when the heated oxygen sensor voltage does not decrease to less than 0.21 V or does not increase to more than 0.59 V during active air fuel ratio control, the ECM determines that the sensor voltage output is abnormal and sets DTCs P0136.
3. Open or Short in Heated Oxygen Sensor Circuit (DTCs P0137 or P0138) During active air fuel ratio control, the ECM calculates the oxygen storage capacity * of the three-way catalytic converter by forcibly regulating the air fuel ratio to become rich or lean. If the heated oxygen sensor has an open or short, or the voltage output of the sensor noticeably decreases, the oxygen storage capacity indicates an extraordinarily high value. Even if the ECM attempts to continue regulating the air fuel ratio to become rich or lean, the heated oxygen sensor output does not change. While performing active air fuel ratio control, when the target air fuel ratio is rich and the heated oxygen sensor voltage output is less than 0.21 V (lean), the ECM interprets this as an abnormally low sensor output voltage and sets DTC P0137. When the target air fuel ratio is lean and the voltage output is 0.59 V or more (rich) during active air fuel ratio control, the ECM determines that the sensor voltage output is abnormally high, and sets DTC P0138. HINT: DTC P0138 is also set if the heated oxygen sensor voltage output is more than 1.2 V for 10 seconds or more. *: The three-way catalytic converter has the capability to store oxygen. The oxygen storage capacity and the emission purification capacity of the three-way catalytic converter are mutually related. The ECM determines whether the catalyst has deteriorated, based on the calculated oxygen storage capacity value. Refer to «DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0300-p106a-except-phv) .
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 sets 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 sets the DTCs when the impedance of the sensor exceeds the threshold of 15 kohms.
5. 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, the ECM determines that the sensor response has deteriorated, illuminates the MIL and sets a DTC.

All

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

HEATED OXYGEN SENSOR IMPEDANCE (LOW IMPEDANCE)

HEATED OXYGEN SENSOR IMPEDANCE (HIGH IMPEDANCE)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (EXTREMELY HIGH)

HEATED OXYGEN SENSOR VOLTAGE DURING FUEL-CUT

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (OUTPUT VOLTAGE)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (LOW VOLTAGE)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (HIGH VOLTAGE)

HEATED OXYGEN SENSOR IMPEDANCE (LOW IMPEDANCE)

HEATED OXYGEN SENSOR IMPEDANCE (HIGH IMPEDANCE)

HEATED OXYGEN SENSOR OUTPUT VOLTAGE (EXTREMELY HIGH)

HEATED OXYGEN SENSOR VOLTAGE DURING FUEL-CUT

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

CONFIRMATION DRIVING PATTERN

P0136, P0137 and P0138

Scheme 306

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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 47 to 75 mph (75 to 120 km/h) for 10 minutes or more [C].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
10. Read the pending DTC [D].
11. If a pending DTC is output, the system is malfunctioning. HINT: 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: P0136, P0137 or P0138.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [C] again.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 307

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) .
4. Turn the power switch off.
5. Turn the power switch on (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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 47 mph (75 km/h), and then decelerate the vehicle by releasing the accelerator pedal for 6 seconds or more to perform the fuel-cut [C].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
10. Read the pending DTC [D].
11. If a pending DTC is output, the system is malfunctioning. HINT: 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: P0139.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, move the shift lever to B and then perform step [C] again.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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 308

HINT

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

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

Scheme 309

Scheme 310

Scheme 311

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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
4. Start the engine.
5. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
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: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) +25% Rich Less than 3.1 V AFS Voltage B1S1 (Air fuel ratio) -12.5% Lean More than 3.4 V O2S B1S2 (Heated oxygen) +25% Rich More than 0.55 V O2S B1S2 (Heated oxygen) -12.5% Lean Less than 0.4 V NOTE: The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. Case Air Fuel Ratio Sensor (Sensor 1) Output Voltage Heated Oxygen Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit 3 Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich) Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2. NOTE: Inspect the fuses for circuits related to this system before performing the following inspection procedure. HINT: Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. If the OX1B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 will be set.

Scheme 312

Scheme 313

Scheme 314

Scheme 315

Scheme 316

Scheme 317

1. READ DTC OUTPUT (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 D --> See step 28 C --> See step 9 B --> See step 13 A: Go to next step
2. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN 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 / A/F Control System / O2S B1S2. Allow the engine to idle. Read the heated oxygen sensor output voltage while idling. Result Result Proceed to 1.0 V or more A Less than 1.0 V B B --> See step 7 A: Go to next step
3. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT) Disconnect the heated oxygen sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 (+B) - 4 (E2) Always 10 kohms or higher 2 (+B) - 3 (OX1B) TEXT IN ILLUSTRATION *1 Component without harness connected (Heated Oxygen Sensor) Reconnect the heated oxygen sensor connector. NG --> See step 36 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR 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 (Check for Short) Tester Connection Condition Specified Condition D28-41 (HT1B) - D28-125 (OX1B) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to ECM) Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM) OK: Go to next step
5. 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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. 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. Confirm the Throttle Idle Position is ON and 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 when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling 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 6 OK --> See step 37
6. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. Reinstall the EGR valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv__installation) . NG --> See step 39 OK --> See step 37
7. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume. Change the fuel injection volume using the Techstream and monitor the voltage output of air fuel ratio and heated oxygen sensors displayed on the Techstream. HINT: Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 1% graduations within the range. The air fuel ratio sensor is displayed as AFS Voltage B1S1, 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. Result Techstream Display (Sensor) Voltage Variation Proceed to AFS Voltage B1S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK Remains at more than 3.3 V NG Remains at less than 3.3 V NG HINT: A normal heated oxygen sensor voltage (O2S B1S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning. NG --> See step 22 OK: Go to next step
8. INSPECT AIR FUEL RATIO SENSOR HINT: This air fuel ratio sensor test is to check the air fuel ratio sensor current during the fuel-cut. When the sensor is normal, the sensor current will indicate below 3.0 mA in this test. Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Drive the vehicle according to the drive pattern listed below: Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Warm up the engine until the engine coolant temperature reaches 75°C (167°F) or more. Drive the vehicle at 47 mph (75 km/h) or more and decelerate the vehicle for 6 seconds or more. Repeat the deceleration above at least 3 times. Enter the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor / Details. Confirm that RANGE B1S1 is either Pass or Fail. If the Techstream shows Incomplete, re-check RANGE B1S1 after performing the drive pattern. Select the RANGE B1S1. Read the Test Value. Standard current Less than 3.0 mA HINT: If the Techstream shows Incomplete again, add the vehicle speed and move the shift lever to B to decelerate the vehicle. NG --> See step 22 OK --> See step 16
9. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume. Change the fuel injection volume using the Techstream and monitor 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 1% graduations within the range. 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. Standard Fluctuates between 0.4 V or less and 0.55 V or more. NG --> See step 13 OK: Go to next step
10. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume. Change the fuel injection volume using the Techstream and monitor the voltage output of air fuel ratio and heated oxygen sensors displayed on the Techstream. HINT: Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 1% graduations within the range. The air fuel ratio sensor is displayed as AFS Voltage B1S1, 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. Result Techstream Display (Sensor) Voltage Variation Proceed to AFS Voltage B1S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK Remains at more than 3.3 V NG Remains at less than 3.3 V NG HINT: A normal heated oxygen sensor voltage (O2S B1S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning. NG --> See step 22 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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. 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. Confirm the Throttle Idle Position is ON and 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 when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling 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 12 OK --> CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND REPAIR CAUSE (FUEL INJECTOR ASSEMBLY, FUEL PRESSURE, GAS LEAK FROM SYSTEM)
12. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. Reinstall the EGR valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv__installation) . NG --> See step 39 OK --> CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND REPAIR CAUSE (FUEL INJECTOR ASSEMBLY, FUEL PRESSURE, GAS LEAK FROM SYSTEM)
13. CHECK EXHAUST GAS LEAK Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK: Go to next step
14. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the heated oxygen sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 ohms 1 (HT1B) - 4 (E2) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (Heated Oxygen Sensor (Sensor 2)) Reconnect the heated oxygen sensor connector. NG --> See step 36 OK: Go to next step
15. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the heated oxygen sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D9-1 (HT1B) - D28-41 (HT1B) Always Below 1 ohms D9-3 (OX1B) - D28-125 (OX1B) D9-4 (E2) - D28-102 (O1B-) Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D9-1 (HT1B) or D28-41 (HT1B) - Body ground Always 10 kohms or higher D9-3 (OX1B) or D28-125 (OX1B) - Body ground TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Heated Oxygen Sensor) *2 Front view of wire harness connector (to ECM) Reconnect the heated oxygen sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM) OK: Go to next step
16. REPLACE HEATED OXYGEN SENSOR Replace the heated oxygen sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . NEXT: Go to next step
17. PERFORM CONFIRMATION DRIVING PATTERN Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTC. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Turn the Techstream off. Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern for P0136, P0137or P0138. NEXT: Go to next step
18. 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 and P0138. Check the DTC judgement result is NORMAL. If it is INCOMPLETE, perform the drive pattern adding 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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. 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. Confirm the Throttle Idle Position is ON and 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 when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling 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 21
20. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. Reinstall the EGR valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv__installation) . NG --> See step 39 OK --> See step 21
21. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
22. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . NEXT: Go to next step
23. PERFORM CONFIRMATION DRIVING PATTERN Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTC. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Turn the Techstream off. Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern for P0136, P0137or P0138. NEXT: Go to next step
24. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136 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 or P0138. Check the DTC judgement result is NORMAL. If it is INCOMPLETE, perform the drive pattern adding the vehicle speed. Result Result Proceed to ABNORMAL (DTC P0136 or P0138 is output) A NORMAL (DTC is not output) B B --> END 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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. 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. Confirm the Throttle Idle Position is ON and 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 when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling 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 36
26. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. Reinstall the EGR valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv__installation) . NG --> See step 39 OK --> See step 27
27. REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
28. READ VALUE USING TECHSTREAM 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 / A/F Control System / O2S B1S2. Allow the engine to idle. Read the heated oxygen sensor output voltage while idling. Result Result Proceed to 1.0 V or more A Less than 1.0 V B B --> See step 33 A: Go to next step
29. INSPECT HEATED OXYGEN SENSOR 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) TEXT IN ILLUSTRATION *1 Component without harness connected (Heated Oxygen Sensor) Reconnect the heated oxygen sensor connector. NG --> See step 36 OK: Go to next step
30. CHECK HARNESS OR 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 (Check for Short) Tester Connection Condition Specified Condition D28-41 (HT1B) - D28-125 (OX1B) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to ECM) Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM) OK --> See step 37
31. 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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. 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. Confirm the Throttle Idle Position is ON and 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 when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling 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 32 OK --> See step 37
32. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. Reinstall the EGR valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv__installation) . NG --> See step 39 OK --> See step 37
33. READ DTC OUTPUT (DTC P0139 IS OUTPUT AGAIN) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Clear the DTC (even if no DTC are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on [A]. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more [B]. Drive the vehicle at 47 mph (75 km/h), and then decelerate the vehicle by releasing the accelerator pedal for 6 seconds or more to perform the fuel cut [C]. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input DTC: P0139. Check the DTC Monitor is NORMAL. If DTC Monitor is INCOMPLETE, perform the drive pattern increasing the vehicle speed and move the shift lever in B to decelerate the vehicle. Result Result Proceed to ABNORMAL (DTC P0139 is output) A NORMAL (DTC is not output) B B --> See step 38 A: Go to next step
34. 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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. 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. Confirm the Throttle Idle Position is ON and 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 when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling 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 35 OK --> See step 36
35. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. Reinstall the EGR valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv__installation) . NG --> See step 39 OK --> See step 36
36. REPLACE HEATED OXYGEN SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
37. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
38. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__check-for-intermittent-problems)
39. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv)

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 sets a DTC.

HINT

1. When DTC P0171 is set, the actual air fuel ratio is on the lean side. When DTC P0172 is set, 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 set. The MIL then illuminates.
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 more than 75°C (167°F)), the system is functioning normally.

Under closed-loop fuel control, a fuel injection volume that deviates from that estimated by the ECM causes 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 value. Deviations from the ECM's estimated fuel injection volume 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 a malfunction threshold, the ECM interprets this a fault in the fuel system and sets a DTC.

Example

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

Scheme 318

FUEL-TRIM

FUEL-TRIM

Scheme 319

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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
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 47 and 75 mph (75 and 120 km/h) and at an engine speed of between 1400 and 3200 rpm for 5 minutes or more [D].
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
11. Read the pending DTC [E].
12. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P0171 or P0172.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [C] through [D] again.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P2195. Refer to WIRING DIAGRAM .

HINT

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

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

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) .
4. Start the engine.
5. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
7. Perform the Active Test operation with the engine idling (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: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) +25% Rich Less than 3.1 V AFS Voltage B1S1 (Air fuel ratio) -12.5% Lean More than 3.4 V O2S B1S2 (Heated oxygen) +25% Rich More than 0.55 V O2S B1S2 (Heated oxygen) -12.5% Lean Less than 0.4 V NOTE: The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. Case Air Fuel Ratio Sensor (Sensor 1) Output Voltage Heated Oxygen Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit 3 Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich) Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2. NOTE: Inspect the fuses for circuits related to this system before performing the following inspection procedure. HINT: Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred. A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich. A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 320

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 is 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 20 A: Go to next step
2. CHECK PCV HOSE CONNECTIONS Inspect the PCV hose connections. OK PCV hose is connected correctly and is 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-phv/pre-iii-2010-2011/remont/mechanical/#intake-inspection-except-phv) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (AIR FUEL RATIO CONTROL) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the voltage outputs of the air fuel ratio sensor and the heated oxygen sensor (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. Standard Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (air fuel ratio) +25% Rich Less than 3.1 V -12.5% Lean More than 3.4 V O2S B1S2 (heated oxygen) +25% Rich More than 0.55 V -12.5% Lean Less than 0.4 V RESULT Status AFS Voltage B1S1 Status O2S B1S2 Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition Misfire Suspected Trouble Area Proceed to Lean/Rich Lean/Rich Normal - - C Lean Lean Actual air fuel ratio lean May occur PCV valve and hose PCV hose connections Fuel injector assembly blockage Gas leaks from exhaust system Intake system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor A Rich Rich Actual air fuel ratio rich - Fuel injector assembly leakage or blockage Gas leaks from exhaust system Ignition system Fuel pressure Mass air flow meter sub-assembly Engine coolant temperature sensor 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 Lean: During Control the Injection Volume for A/F Sensor, the air fuel ratio sensor output voltage (AFS Voltage) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V. Rich: During Control the Injection Volume for A/F Sensor, the AFS Voltage is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V. Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the heated oxygen sensor alternates correctly. C --> See step 15 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 / Coolant Temp. Read the Data List twice, when the engine is both cold and warmed up. Standard value With cold engine: Same as ambient air temperature. With warm engine: 80 to 100°C (176 to 212°F). NG --> See step 21 OK: Go to next step
6. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY Inspect the mass air flow meter sub-assembly. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . NG --> See step 22 OK: Go to next step
7. CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-inspection-except-phv) . NG --> REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step
8. INSPECT FOR EXHAUST GAS LEAK Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST SYSTEM OK: Go to next step
9. CHECK SPARK AND IGNITION HINT: Refer to the ignition system inspection procedure. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/ignition-system/#engine-ignition-system-inspection-except-phv) . If the spark plugs or ignition system malfunctions, engine misfires may occur. The misfire count can be read using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Cylinder #1 Misfire Count (to Cylinder #4 Misfire Count). NG --> REPAIR OR REPLACE IGNITION SYSTEM OK: Go to next step
10. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME) HINT: Refer to the fuel injector inspection procedure. Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-except-phv) . If the injectors malfunction, engine misfires may occur. The misfire count can be read using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Cylinder #1 Misfire Count (to Cylinder #4 Misfire Count). Result Result Proceed to NG A OK B B --> See step 16 A --> See step 23
11. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Disconnect the air fuel ratio sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 ohms 1 (HA1A) - 4 (A1A-) Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Component without harness connected (to Air Fuel Ratio Sensor) Reconnect the air fuel ratio sensor connector. NG --> See step 24 OK: Go to next step
12. 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 Switch Condition Specified Condition D24-2 (+B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Air Fuel Ratio Sensor) Reconnect the air fuel ratio sensor connector. 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) Disconnect the air fuel ratio sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D24-1 (HA1A) - D28-18 (HA1A) Always Below 1 ohms D24-3 (A1A+) - D28-103 (A1A+) Always Below 1 ohms D24-4 (A1A-) - D28-126 (A1A-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D24-1 (HA1A) or D28-18 (HA1A) - Body ground Always 10 kohms or higher D24-3 (A1A+) or D28-103 (A1A+) - Body ground Always 10 kohms or higher D24-4 (A1A-) or D28-126 (A1A-) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *1 Front view of wire harness connector (to Air Fuel Ratio Sensor) *2 Front view of wire harness connector (to ECM) Reconnect the air fuel ratio sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM) OK: Go to next step
14. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . NEXT: Go to next step
15. PERFORM CONFIRMATION DRIVING PATTERN 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-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the power and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0171, P0172. Check the DTC judgment result. Result Result Proceed to ABNORMAL (DTC P0171 or P0172 is output) A NORMAL (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. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. 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. Confirm the Throttle Idle Position is ON and 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 when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling 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 18 A: Go to next step
17. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. Reinstall the EGR valve assembly. Refer to «INSTALLATION»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv__installation) . NG --> See step 25 OK: Go to next step
18. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv) . NEXT: Go to next step
19. 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 DTC. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__dtc-check-clear) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-except-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTCs: P0171, P0172. Check the DTCs judgment result. NEXT --> END
20. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-except-phv__diagnostic-trouble-code-chart)
21. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
22. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
23. REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-except-phv)
24. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-except-phv)
25. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-except-phv)

See also:
• DTC CHECK / CLEAR
• INSPECTION MODE PROCEDURE
• REMOVAL
• REMOVAL
• CHECK FOR INTERMITTENT PROBLEMS
• CHECKING MONITOR STATUS
• INSTALLATION
• INSPECTION
• DIAGNOSTIC TROUBLE CODE CHART
• DESCRIPTION
• ON-VEHICLE INSPECTION
• REMOVAL
• INSTALLATION
• REMOVAL
• DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1)
• ON-VEHICLE INSPECTION - Step 2
• ON-VEHICLE INSPECTION
• INSPECTION
• DESCRIPTION
• WIRING DIAGRAM
• DESCRIPTION