Engine Control (sfi) System (diagnostic Codes (p2102-u0293) & Circuit Tests) (phv) Toyota Prius PHV pre-III

DESCRIPTION

The throttle actuator is operated by the ECM and opens and closes the throttle valve using gears.

The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body assembly. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT

This electronic throttle control system does not use a throttle cable.

MONITOR DESCRIPTION

The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this value. If the current is outside the standard range, the ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and stores a DTC.

Example

1. When the electrical current is below 0.5 A and the throttle actuator duty ratio exceeds 80%, the ECM interprets this as the current being outside the standard range, illuminates the MIL and stores a DTC.
2. If the malfunction is not repaired successfully, a DTC is stored when the engine is quickly revved to a high engine speed several times after the engine has idled for 5 seconds after engine start.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

ALL

P2102

P2103

TYPICAL MALFUNCTION THRESHOLDS

P2102

P2103

Scheme 442

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-phv__dtc-checkclear) .
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-phv) .
7. Start the engine.
8. With the vehicle stationary, fully depress the accelerator pedal and quickly release it [B].
9. Check that 16 seconds or more have elapsed from the instant when the accelerator pedal is first depressed.
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
11. Read the DTC [C].
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: P2102 or P2103.
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] 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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to electronic throttle control system malfunctions is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 5.5° throttle angle by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

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

Scheme 443

INSPECTION PROCEDURE

HINT

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
2. The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor Duty (Open) / Throttle Motor Duty (Close)) can be read using the Techstream. However, the ECM shuts off the throttle actuator current when the electronic throttle control system malfunctions.

Scheme 444

1. INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR) Disconnect the throttle body assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 (M+) - 1 (M-) 20°C (68°F) 0.3 to 100 ohms TEXT IN ILLUSTRATION *a Component without harness connected (Throttle Body Assembly) Reconnect the throttle body assembly connector. NG --> See step 5 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (THROTTLE BODY ASSEMBLY - 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 D4-2 (M+) - D28-21 (M+) Always Below 1 ohms D4-1 (M-) - D28-20 (M-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D4-2 (M+) or D28-21 (M+) - Body ground Always 10 kohms or higher D4-1 (M-) or D28-20 (M-) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the throttle body assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE BODY ASSEMBLY - ECM) OK: Go to next step
3. INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) Check for foreign objects between the throttle valve and the housing. OK No foreign objects between throttle valve and housing. NG --> REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY ASSEMBLY OK: Go to next step
4. INSPECT THROTTLE BODY ASSEMBLY (THROTTLE VALVE) Check if the throttle valve opens and closes smoothly. OK Throttle valve opens and closes smoothly. NG --> See step 5 OK --> See step 6
5. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The throttle actuator is operated by the ECM, and opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body assembly. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT

This electronic throttle control system does not use a throttle cable.

The ECM determines that there is a malfunction in the electronic throttle control system when the throttle valve remains at the fixed angle despite a high drive current from the ECM. The ECM illuminates the MIL and stores a DTC.

If the malfunction is not repaired successfully, a DTC is stored when the accelerator pedal is fully depressed and released quickly (to fully open and close the throttle valve) after the engine is next started.

ALL

P2111 (THROTTLE ACTUATOR STUCK OPEN)

P2112 (THROTTLE ACTUATOR STUCK CLOSED)

P2111 (THROTTLE ACTUATOR STUCK OPEN)

P2112 (THROTTLE ACTUATOR STUCK CLOSED)

Scheme 445

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-phv__dtc-checkclear) .
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-phv) .
7. Start the engine and fully depress and release the accelerator pedal quickly (to fully open and close the throttle valve).
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9. Read the DTC [B].
10. If a DTC is output, the system is malfunctioning. HINT: If a DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P2111 or P2112.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, fully depress and release the accelerator pedal quickly.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. 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.
16. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

When either of these DTCs, as well as other DTCs relating to electronic throttle control system malfunctions is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 5.5° throttle angle by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

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

WIRING DIAGRAM

Refer to DTC P2102. Refer to WIRING DIAGRAM .

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body assembly and then check that the throttle valve moves smoothly. OK Throttle valve is not contaminated with foreign objects and moves smoothly. NG --> See step 3 OK: Go to next step
2. CHECK WHETHER DTC OUTPUT RECURS (DTC P2111 OR P2112) 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-phv__dtc-checkclear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine, and fully depress and release the accelerator pedal quickly (to fully open and close the throttle valve). Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P2111 or P2112 is output B B --> See step 4 A --> See step 5
3. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
4. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-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-phv__check-for-intermittent-problems)

The electronic throttle control system has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (below 4 V), the ECM determines that there is a malfunction in the electronic throttle control system and cuts off the current to the throttle actuator.

When the voltage becomes unstable, the electronic throttle control system itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the power switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.

HINT

This electronic throttle control system does not use a throttle cable.

Scheme 446

The ECM monitors the battery supply voltage applied to the throttle actuator.

When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM illuminates the MIL and stores the DTC.

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

COMPONENT OPERATING RANGE

Scheme 447

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-phv__dtc-checkclear) .
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-phv) .
7. Start the engine.
8. Slowly depress the accelerator pedal, raise the engine speed to approximately 2500 rpm for approximately 5 seconds, and then idle the engine [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: P2118.
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 [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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

When this DTC or other DTCs relating to electronic throttle control system malfunctions, are stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 5.5° throttle angle by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly. Fail-safe mode continues until a pass condition is detected, and the power switch is then turned off.

Scheme 448

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

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 449

1. READ VALUE USING TECHSTREAM (+BM VOLTAGE) 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 / +BM voltage. Read the value displayed on the Techstream. Standard Voltage 11 to 14 V NG --> See step 2 OK --> See step 3
2. CHECK HARNESS AND CONNECTOR (ECM - BATTERY, BODY GROUND) Disconnect the ECM connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A57-3 (+BM) - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D28-19 (ME01) - Body ground Always Below 1 ohms D28-104 (E1) - Body ground Always Below 1 ohms Reconnect the ECM connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BATTERY, BODY GROUND) OK --> See step 4
3. 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-phv__check-for-intermittent-problems)
4. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The electronic throttle control system is composed of the throttle actuator, throttle position sensor, accelerator pedal position sensor, and ECM. The ECM operates the throttle actuator to regulate the throttle valve in response to driver inputs. The throttle position sensor detects the opening angle of the throttle valve, and provides the ECM with feedback so that the throttle valve can be appropriately controlled by the ECM.

The ECM determines the actual opening angle of the throttle valve from the throttle position sensor signal. The actual opening angle is compared to the target opening angle commanded by the ECM. If the difference between these 2 values is outside the standard range, the ECM interprets this as a malfunction in the electronic throttle control system. The ECM then illuminates the MIL and stores the DTC.

If the malfunction is not repaired successfully, the DTC is stored when the accelerator pedal is quickly released (to close the throttle valve) after the engine speed reaches 5000 rpm by depressing the accelerator pedal (fully open the throttle valve).

Scheme 450

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-phv__dtc-checkclear) .
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-phv) .
7. Start the engine.
8. Idle the engine for 20 seconds.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
10. Read the DTC [B].
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: P2119.
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, fully depress and release the accelerator pedal 3 times.
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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

When this DTC, as well as other DTCs relating to electronic throttle control system malfunctions is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 5.5° throttle angle by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly. Fail-safe mode continues until a pass condition is detected, and the power switch is then turned off.

Refer to DTC P2102. Refer to WIRING DIAGRAM .

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2119) 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 P2119 is output A DTC P2119 and other DTCs are output B HINT: If any DTCs other than P2119 are output, troubleshoot those DTCs first. B --> See step 5 A: Go to next step
2. INSPECT THROTTLE BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR) Disconnect the throttle body assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 (M+) - 1 (M-) 20°C (68°F) 0.3 to 100 ohms TEXT IN ILLUSTRATION *a Component without harness connected (Throttle Body Assembly) Reconnect the throttle body assembly connector. NG --> See step 6 OK: Go to next step
3. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P2119) 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-phv__dtc-checkclear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Allow the engine to idle for 20 seconds or more. Fully depress and release the accelerator pedal 3 times quickly. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. HINT: The output voltage of the throttle position sensor can be checked using the Techstream. Variations in the output voltage indicate that the throttle actuator is in operation. To check the output voltage using the Techstream, enter the following menus: Powertrain / Engine and ECT / Data List / Throttle Position No. 1. Result Result Proceed to DTC is not output A DTC P2119 is output B B --> See step 6 A --> END
5. 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-phv__diagnostic-trouble-code-chart)
6. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

HINT

1. Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
2. Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

The air fuel ratio sensor generates a voltage* that corresponds to the actual air fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio level, and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.

The air fuel ratio sensor is the planar type and is integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are the narrow type. The heat generated by the heater is conducted to the solid electrolyte through the alumina, therefore the sensor activation is accelerated.

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 level.

*: Value changes inside the ECM. Since the air fuel ratio sensor is a current output element, the current is converted into a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.

Scheme 451

HINT

1. When any of these DTCs are set, check the air fuel ratio sensor voltage output by entering the following menus on the Techstream: Powertrain / Engine and ECT / Data List / All Data / AFS Voltage B1S1.
2. Short-term fuel trim values can also be read using the Techstream.
3. The ECM regulates the voltages at the A1A+ and A1A- terminals of the ECM to a constant level. Therefore, the air fuel ratio sensor voltage output cannot be confirmed without using the Techstream.
4. If an air fuel ratio sensor malfunction is detected, the ECM sets a DTC.

Sensor Voltage Detection Monitor

Under the air fuel ratio feedback control, if the air fuel ratio sensor voltage output indicates rich or lean for a certain period of time, the ECM determines that there is a malfunction in the air fuel ratio sensor. The ECM illuminates the MIL and stores a DTC.

Example

If the air fuel ratio sensor voltage output is below 2.8 V (very rich condition) and heated oxygen sensor output voltage falls from 0.59 V or more to less than 0.21 V for 5 seconds, the ECM stores DTC P2196. Alternatively, if the air fuel ratio sensor voltage output is higher than 3.8 V (very lean condition) and heated oxygen sensor output voltage rises from less than 0.21 V to 0.59 V or more for 5 seconds, DTC P2195 is stored.

Sensor Current Detection Monitor

A rich air fuel mixture causes a low air fuel ratio sensor current, and a lean air fuel mixture causes a high air fuel ratio sensor current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor current during fuel-cut and detects any abnormal current values.

If the air fuel ratio sensor output is 3.6 mA or higher for more than 3 seconds of cumulative time, the ECM interprets this as a malfunction in the air fuel ratio sensor and stores DTC P2195 (stuck on high side). If the air fuel ratio sensor output is below 1.57 mA for more than 3 seconds of cumulative time, the ECM stores DTC P2196 (stuck on low side).

Scheme 452

ALL

SENSOR VOLTAGE DETECTION MONITOR (LEAN SIDE MALFUNCTION P2195)

SENSOR VOLTAGE DETECTION MONITOR (RICH SIDE MALFUNCTION P2196)

SENSOR CURRENT DETECTION MONITOR (P2195, P2196)

SENSOR VOLTAGE DETECTION MONITOR (LEAN SIDE MALFUNCTION P2195)

SENSOR VOLTAGE DETECTION MONITOR (RICH SIDE MALFUNCTION P2196)

SENSOR CURRENT DETECTION MONITOR (HIGH SIDE MALFUNCTION P2195)

SENSOR CURRENT DETECTION MONITOR (LOW SIDE MALFUNCTION P2196)

MONITOR RESULT

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

CONFIRMATION DRIVING PATTERN

HINT

This confirmation driving pattern is used in the "Perform Confirmation Driving Pattern" procedure of the following diagnostic troubleshooting procedure.

Scheme 453

Scheme 454

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-phv__dtc-checkclear) .
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-phv) .
8. Start the engine, and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
9. On the Techstream, enter the following menus to check the fuel-cut status: Powertrain / Engine and ECT / Data List / All Data / Idle Fuel Cut.
10. Drive the vehicle at between 47 and 75 mph (75 and 120 km/h) for at least 10 minutes [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
11. Move the shift lever in B [C].
12. Accelerate the vehicle to 47 mph (75 km/h) or more by depressing the accelerator pedal for at least 10 seconds [D].
13. Soon after performing step [D] above, release the accelerator pedal for at least 8 seconds without depressing the brake pedal in order to execute fuel-cut control [E]. HINT: Fuel-cut is performed when the following conditions are met: Accelerator pedal is fully released. Engine speed is 2500 rpm or more (fuel injection returns at 1000 rpm).
14. Allow the vehicle to decelerate until the vehicle speed decreases to less than 6 mph (10 km/h).
15. Repeat steps [C] through [E] above at least 3 times in one driving cycle.
16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
17. Read the pending DTC [F].
18. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
19. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
20. Input the DTC: P2195 or P2196.
21. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [E].
22. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
23. 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.
24. 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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 455

HINT

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

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

1. Connect the Techstream to the DLC3.
2. 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-phv) .
4. Start the engine.
5. Turn the Techstream on.
6. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
7. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
8. Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
9. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream.

HINT

1. The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.

1. Each sensor reacts in accordance with increases in the fuel injection volume.

Note. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case Air Fuel Ratio Sensor (Sensor 1) Output Voltage Heated Oxygen Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit 3 Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich)

Scheme 456

Scheme 457

Scheme 458

1. Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.
2. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2.

HINT

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
2. A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
3. A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 459

Scheme 460

Scheme 461

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P2195 OR P2196) 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 P2195 or P2196 is output A DTC P2195 or P2196 and other DTCs are output B HINT: If any DTCs relating to the air fuel ratio sensor (DTCs for the air fuel ratio sensor heater or air fuel ratio sensor admittance) are output, troubleshoot those DTCs first. B --> See step 29 A: Go to next step
2. READ VALUE USING TECHSTREAM (TEST VALUE OF AIR FUEL RATIO SENSOR) 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-phv__dtc-checkclear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Allow the vehicle to drive in accordance with the drive pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor / Status 2. Check that the Status 2 of O2 Sensor is Complete. If the status is still Incomplete, perform the drive pattern increasing the vehicle speed and using the second gear to decelerate the vehicle. Enter the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor / Details / RANGE B1 S1. Check the test value of the air fuel ratio sensor output current during fuel-cut. Result Result Proceed to Within normal range (1.57 mA or higher, and below 3.6 mA) A Outside normal range (Below 1.57 mA, or 3.6 mA or higher) B B --> See step 26 A: Go to next step
3. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF AIR FUEL RATIO 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-phv) . Start the engine. Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / AFS Voltage B1S1 and Engine Speed, then press the Record button. Check the air fuel ratio sensor voltage 3 times, when the engine is in each of the following conditions: (1) While idling (check for at least 30 seconds) (Step "A"). (2) At an engine speed of approximately 2500 rpm (without any sudden changes in engine speed) (Step "B"). (3) Raise the engine speed to 2500 rpm and then quickly release the accelerator pedal so that the throttle valve is fully closed (Step "C"). Standard Voltage Condition Air Fuel Ratio Sensor Voltage Variation Reference Steps "A" and "B" Changes at approximately 3.3 V Between 3.1 V and 3.4 V Step "C" Increases to 3.8 V or higher This occurs during engine deceleration (when fuel-cut performed) HINT: For more information, see the diagrams below. HINT: If the output voltage of the air fuel ratio sensor remains at approximately 3.3 V (see Malfunction Condition diagram Above) under any conditions, including those above, the air fuel ratio sensor may have an open circuit. (This will also happen if the air fuel ratio sensor heater has an open circuit.) If the output voltage of the air fuel ratio sensor remains at either approximately 3.8 V or higher, or below 2.8 V (see Malfunction Condition diagram above) under any conditions, including those above, the air fuel ratio sensor may have a short circuit. The ECM stops fuel injection (fuel cut) during engine deceleration. This causes a lean condition and results in a momentary increase in the air fuel ratio sensor output voltage. When the vehicle is driven: The output voltage of the air fuel ratio sensor may be below 2.8 V during fuel enrichment. For the vehicle, this translates to a sudden increase in speed with the accelerator pedal fully depressed when trying to overtake another vehicle. The air fuel ratio sensor is functioning normally. The air fuel ratio sensor is a current output element; therefore, the current is converted into a voltage inside the ECM. Measuring the voltage at the connectors of the air fuel ratio sensor or ECM will show a constant voltage result. NG --> See step 14 OK: Go to next step
4. 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-phv__dtc-checkclear) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the tester on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
5. CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196) 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. Check the DTC judgment result. Result Result Proceed to ABNORMAL (DTC P2195 or P2196 is output) A NORMAL (DTC is not output) B B --> See step 13 A: Go to next step
6. 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-phv) . NEXT: Go to next step
7. 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-phv__dtc-checkclear) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the tester on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196) 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. Check the DTC judgment result. Result Result Proceed to ABNORMAL (DTC P2195 or P2196 is output) A NORMAL (DTC is not output) B B --> END A: Go to next step
9. 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-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 11 A: Go to next step
10. 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-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-phv__installation) . NG --> See step 30 OK: Go to next step
11. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT: Go to next step
12. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . 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-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: P2195 or P2196. Check the DTC judgment result. NEXT --> END
13. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST Has the vehicle run out of fuel in the past? NO --> See step 31 YES --> DTC CAUSED BY RUNNING OUT OF FUEL
14. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE). Refer to «PROCEDURE - Step 1»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv) NG --> See step 32 OK: Go to next step
15. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) Disconnect the air fuel ratio sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D24-2 (+B) - Body ground Power switch on (IG) 11 to 14 V Turn the power switch off. 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 *a Front view of wire harness connector (to Air Fuel Ratio Sensor) *b 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 OK: Go to next step
16. 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-phv) . OK No leaks from the intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
17. 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-phv) . NG --> REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step
18. INSPECT FUEL INJECTOR ASSEMBLY Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor). Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-phv) . NG --> See step 33 OK: Go to next step
19. 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-phv) . NEXT: Go to next step
20. 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-phv__dtc-checkclear) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the tester on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
21. CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196) 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. Check the DTC judgment result. Result Result Proceed to ABNORMAL (DTC P2195 or P2196 is output) A NORMAL (DTC is not output) B B --> END A: Go to next step
22. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-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 24 A: Go to next step
23. 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-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-phv__installation) . NG --> See step 30 OK: Go to next step
24. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT: Go to next step
25. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . 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-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: P2195 or P2196. Check the DTC judgment result. NEXT --> END
26. 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-phv) . NEXT: Go to next step
27. 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-phv__dtc-checkclear) . Turn the power switch off and wait for 30 seconds. Turn the power switch on (IG) and turn the tester on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
28. CHECK WHETHER DTC OUTPUT RECURS (DTC P2195 OR P2196) 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. Check the DTC judgment result. Result Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P2195 or P2196 is output) B B --> See step 34 A --> END
29. 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-phv__diagnostic-trouble-code-chart)
30. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv)
31. 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-phv__check-for-intermittent-problems)
32. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
33. REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-phv)
34. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

HINT

1. Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
2. Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

The air fuel ratio sensor, which is located between the exhaust manifold and catalyst, consists of alloyed metal elements and a heater.

Depending on the engine operating conditions, the heater heats the sensor elements to activate them. Battery voltage is applied to the heater and the sensor ground is controlled by the ECM using a duty ratio.

The sensor elements convert the oxygen concentration in the exhaust gas into voltage values to output. Based on the voltage, the ECM determines the air fuel ratio and regulates the fuel injection volume depending on the air fuel ratio and engine operating conditions. The voltage changes between 0.6 V and 4.5 V while the engine is running. If the air fuel ratio is lean, which means the oxygen concentration in the exhaust gas is high, the voltage is high. If the air fuel ratio is rich, which means the oxygen concentration in the exhaust gas is low, the voltage is low.

These DTCs are output when there is an open or short in the air fuel ratio sensor circuit, or if air fuel ratio sensor output drops. To detect these problems, the voltage of the air fuel ratio sensor is monitored when turning the power switch on (IG), and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the air fuel ratio sensor is between 0.5 V and 4.5 V, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM will determine that there is a malfunction in the air fuel ratio sensor. If the same malfunction is detected in next driving cycle, the MIL will be illuminated and a DTC will be stored.

P2237 AND P2238

OTHER

P2237 (AIR FUEL RATIO SENSOR OPEN CIRCUIT BETWEEN A1A+ AND A1A-)

P2238 (AIR FUEL RATIO SENSOR LOW IMPEDANCE)

OTHER

P2237 (AIR FUEL RATIO SENSOR OPEN CIRCUIT BETWEEN A1A+ AND A1A-)

P2238 (AIR FUEL RATIO SENSOR LOW IMPEDANCE)

P2238 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A+ AND GND)

P2239 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A+ AND +B)

P2252 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A- AND GND)

P2253 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A- AND +B)

P2238 (AIR FUEL RATIO SENSOR SHORT CIRCUIT BETWEEN A1A+ AND A1A-)

Scheme 462

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-phv__dtc-checkclear) .
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-phv) .
7. Start the engine and wait 2 minutes.
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
9. Read the pending DTC [B].
10. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P2237, P2238, P2239, P2252 or P2253.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, idle the engine for 3 minutes.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Check the judgment result [C]. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
16. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . 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-phv) .
4. Start the engine.
5. Warm up the engine at 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 Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
8. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream.

HINT

1. The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.

1. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Note. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case Air Fuel Ratio Sensor (Sensor 1) Output Voltage Heated Oxygen Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit 3 Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich)

1. Performing Control the Injection Volume for A/F Sensor enables technicians to check and graph the output voltages of both the air fuel ratio and heated oxygen sensors.
2. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1S1 and O2S B2S1.

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 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+) D24-4 (A1A-) - D28-126 (A1A-) 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 D24-4 (A1A-) or D28-126 (A1A-) - Body ground 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
2. 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-phv) . NEXT: Go to next step
3. PERFORM CONFIRMATION DRIVING PATTERN Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the Pending DTCs. Result Result Proceed to DTC is not output A DTC P2237, P2238, P2239, P2252 or P2253 is output B B --> See step 5 A --> END
5. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

DTC SUMMARY

HINT

The vent valve is built into the canister pump module.

The circuit description can be found in the EVAP (evaporative emission) System. Refer to DESCRIPTION .

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

Vent valve stuck open (vent)

In operation C, the vent valve turns on (closes) and the EVAP system pressure is then measured by the ECM, using the canister pressure sensor, to conduct an EVAP leak check. If the pressure does not increase when the vent valve is opened, the ECM interprets this as the vent valve being stuck open. The ECM illuminates the MIL and sets the DTC.

Scheme 463

Scheme 464

Key-off monitor sequence 1 to 15

1. ATMOSPHERIC PRESSURE MEASUREMENT

2. FIRST REFERENCE PRESSURE MEASUREMENT

3. VENT VALVE STUCK CLOSED CHECK

4. VACUUM INTRODUCTION FOR CANISTER

5. PURGE VSV STUCK CLOSED CHECK

6. SECOND REFERENCE PRESSURE MEASUREMENT

7. CANISTER LEAK CHECK

8. FUEL TANK CLOSED VALVE (TCV) STUCK CLOSED CHECK

9. VACUUM INTRODUCTION FOR FUEL TANK

10. TCV STUCK CLOSED CHECK

11. FUEL TANK PRESSURE SENSOR STUCK CHECK

12 THIRD REFERENCE PRESSURE MEASUREMENT

13. FUEL TANK LEAK CHECK

14. FUEL TANK PRESSURE SENSOR STUCK CHECK

15. ATMOSPHERIC PRESSURE MEASUREMENT

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

Scheme 465

Note. The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode [A].
7. After the Evaporative System Check is completed, check for DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
8. Read the Pending DTC [B].
9. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All readiness.
11. Input the DTC: P2420.
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 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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

The circuit description can be found in the EVAP (evaporative emission) System. Refer to DESCRIPTION .

Refer to the EVAP System. Refer to INSPECTION PROCEDURE .

Scheme 466

Scheme 467

1. P2450: Fuel vapor-containment valve stuck open During sequence C, the vacuum pump creates vacuum in the EVAP system. If the pressure in the fuel tank drops, the ECM determines that the fuel vapor-containment valve is stuck open. The ECM then illuminates the MIL and sets the DTC. (This DTC is set according to 2 trip detection logic.)
2. P2451: Fuel vapor-containment valve stuck closed (vent) During sequence G, the fuel vapor-containment valve opens to allow vacuum pressure generated by the vacuum pump into the fuel tank. If the pressure in the fuel tank does not drop, the ECM determines that the fuel vapor-containment valve is stuck closed. The ECM then illuminates the MIL and sets the DTC. (This DTC is set according to 2 trip detection logic.) During sequence I, the tank close valve opens to allow atmospheric pressure into the fuel tank. If there is no change in fuel tank pressure, the ECM determines that the fuel vapor-containment valve is stuck closed. The ECM then illuminates the MIL and sets the DTC. (This DTC is set according to 2 trip detection logic.)

Key-off monitor sequence 1 to 15

1. ATMOSPHERIC PRESSURE MEASUREMENT

2. FIRST REFERENCE PRESSURE MEASUREMENT

3. VENT VALVE STUCK CLOSED CHECK

4. VACUUM INTRODUCTION FOR CANISTER

5. PURGE VSV STUCK CLOSED CHECK

6. SECOND REFERENCE PRESSURE MEASUREMENT

7. CANISTER LEAK CHECK

8. FUEL TANK CLOSED VALVE (TCV) STUCK CLOSED CHECK

9. VACUUM INTRODUCTION FOR FUEL TANK

10. TCV STUCK CLOSED CHECK

11. FUEL TANK PRESSURE SENSOR STUCK CHECK

12 THIRD REFERENCE PRESSURE MEASUREMENT

13. FUEL TANK LEAK CHECK

14. FUEL TANK PRESSURE SENSOR STUCK CHECK

15. ATMOSPHERIC PRESSURE MEASUREMENT

P2450: Fuel vapor-containment valve stuck open

P2451: Fuel vapor-containment valve stuck close

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

Note. The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) .
4. Turn the power switch off and wait for 30 seconds.
5. Turn the power switch on (IG) and turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode [A].
7. After the Evaporative System Check is completed, check for DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
8. Read the Pending DTC [B].
9. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All readiness.
11. Input the DTC: P2450 or P2451.
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 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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

The soak timer operates after the power switch is turned off. When a certain amount of time has elapsed after turning the power switch off, the soak timer activates the ECM to perform malfunction checks which can only be performed after the engine is stopped. The soak timer is built into the ECM.

Scheme 468

If the soak timer activates the ECM even though only a short amount of time has elapsed since the power switch was turned off, or if the soak timer does not activate the ECM even though a considerable amount of time has elapsed since the power switch was turned off, the ECM determines that the soak timer is malfunctioning, illuminates the MIL and stores a DTC the next time the power switch is turned on (IG).

While the engine is running, the ECM monitors the synchronization of the soak timer and the CPU clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the MIL and sets the DTC (2 trip detection logic).

ALL

CASE 1

CASE 2

CASE 3

CASE 1

CASE 2

CASE 3

Scheme 469

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-phv__dtc-checkclear) .
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-phv) .
7. Start the engine.
8. Idle the engine for 10 minutes or more [B].
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: P2610.
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 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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. DTC P2610 is set if an internal ECM problem is detected. Diagnostic procedures are not required. ECM replacement is required.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT: Go to next step
2. CHECK WHETHER DTC OUTPUT RECURS Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine and wait for 10 minutes or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. If no pending DTC is displayed, the repair has been successfully completed. NEXT --> END

The ECM controls the water pump assembly by calculating the necessary amount of coolant flow based on engine coolant temperature, engine speed and vehicle speed information. The speed of the water pump assembly is controlled steplessly using duty cycle signal sent from the ECM. This optimal control enhances warm-up performance and reduces cooling losses, thus reducing the specific fuel consumption of the engine.

The ECM calculates the speed of the water pump assembly using a duty cycle signal sent from the water pump assembly. When the speed of the water pump assembly becomes less than 900 rpm while it is operating, the ECM detects the malfunction and stores DTC P261B.

The water pump assembly operates steplessly based on a duty cycle signal sent from the ECM. The ECM monitors the current of the water pump assembly. If actual drive duty cycle ratio does not correspond to the target drive duty cycle , the ECM detects the malfunction and stores DTC P261C and P261D.

ALL

P261B: ENGINE COOLANT PUMP CIRCUIT PERFORMANCE

P261C, P261D: ENGINE COOLANT PUMP CIRCUIT RANGE CHECK (LOW VOLTAGE, HIGH VOLTAGE)

P261B: ENGINE COOLANT PUMP CIRCUIT PERFORMANCE

P261C: ENGINE COOLANT PUMP CIRCUIT RANGE CHECK (LOW VOLTAGE)

P261D: ENGINE COOLANT PUMP CIRCUIT RANGE CHECK (HIGH VOLTAGE)

Scheme 470

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-phv__dtc-checkclear) .
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-phv) .
7. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or higher) [B].
8. Idle the engine for 20 seconds or more [C].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
10. Read the DTC [D].
11. If the 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: P261B, P261C or P261D.
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 [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 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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 471

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 472

Scheme 473

Scheme 474

Scheme 475

1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE ELECTRIC WATER PUMP) 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-phv) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Electric Water Pump. Touch the water pump and check that the pump is operating (vibrating). OK The water pump is operating (vibrating). NG --> See step 4 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (WATER PUMP ASSEMBLY - ECM) HINT: Confirm a good connection at the water pump assembly and ECM connectors. Disconnect the water pump 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 D13-2 (NWP) - A57-11 (WPI) Always Below 1 ohms D13-4 (SWP) - A57-10 (WPO) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D13-2 (NWP) or A57-11 (WPI) - Body ground Always 10 kohms or higher D13-4 (SWP) or A57-10 (WPO) - Body ground Always 10 kohms or higher Reconnect the water pump assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (WATER PUMP ASSEMBLY - ECM) OK: Go to next step
3. CHECK ECM (WPI VOLTAGE) Disconnect the water pump 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 D13-2 (NWP) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Water Pump Assembly) Reconnect the water pump assembly connector. NG --> See step 14 OK --> REPLACE WATER PUMP ASSEMBLY
4. CHECK WATER PUMP ASSEMBLY (POWER SOURCE) HINT: Confirm a good connection at the water pump assembly and ECM connectors. Disconnect the water pump 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 D13-1 (+B) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Water Pump Assembly) Reconnect the water pump assembly connector. NG --> See step 10 OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (WATER PUMP ASSEMBLY - BODY GROUND) Disconnect the water pump assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Switch Condition Specified Condition D13-5 (PGND) - Body ground Always Below 1 ohms Reconnect the water pump assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (WATER PUMP ASSEMBLY - BODY GROUND) OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (WATER PUMP ASSEMBLY - ECM) Disconnect the water pump 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 D13-2 (NWP) - A57-11 (WPI) Always Below 1 ohms D13-4 (SWP) - A57-10 (WPO) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D13-2 (NWP) or A57-11 (WPI) - Body ground Always 10 kohms or higher D13-4 (SWP) or A57-10 (WPO) - Body ground Always 10 kohms or higher Reconnect the water pump assembly connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (WATER PUMP ASSEMBLY - ECM) OK: Go to next step
7. REPLACE WATER PUMP ASSEMBLY Replace the water pump assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/cooling-fan/#engine-cooling-system-service-information-phv) . NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P261B, P261C OR P261D) Connect the Techstream to the DLC3. Turn the power switch on. 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-phv) . 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 P261B, P261C or P261D is output A DTC is not output B B --> END A --> See step 9
9. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
10. INSPECT ENG W/P RELAY Remove the ENG W/P relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 No battery voltage applied between terminals 1 and 2 10 kohms or higher 3 - 5 Battery voltage applied between terminals 1 and 2 Below 1 ohms Reinstall the ENG W/P relay to the engine room relay block. NG --> REPLACE ENG W/P RELAY OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (ENG W/P RELAY - WATER PUMP ASSEMBLY) Remove the ENG W/P relay from the engine room relay block. Disconnect the water pump assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition ENG W/P relay terminal 5 - D13-1 (+B) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition ENG W/P relay terminal 5 or D13-1 (+B) - Body ground Always 10 kohms or higher Reinstall the ENG W/P relay to the engine room relay block. Reconnect the water pump assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENG W/P RELAY - WATER PUMP ASSEMBLY) OK: Go to next step
12. CHECK ENG W/P RELAY (POWER SOURCE) Remove the ENG W/P relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition ENG W/P relay terminal 3 - Body ground Always 11 to 14 V TEXT IN ILLUSTRATION *1 Engine Room Relay Block Reinstall the ENG W/P relay to the engine room relay block. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENG W/P RELAY - BATTERY) OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (ENG W/P RELAY - BODY GROUND) Remove the ENG W/P relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Switch Condition Specified Condition ENG W/P relay terminal 1 - Body ground Always Below 1 ohms Reinstall the ENG W/P relay to the engine room relay block. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENG W/P RELAY - BODY GROUND) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENG W/P RELAY - EFI MAIN RELAY)
14. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

HINT

1. Refer to DTC P2195. Refer to «DESCRIPTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p2102-u0293-circuit-tests-phv) .
2. Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

After the engine is warmed up, the ECM performs air fuel ratio feedback control to maintain the air fuel ratio at the stoichiometric level. In addition, active A/F control is performed for approximately 15 to 20 seconds after preconditions are met in order to measure the air fuel ratio sensor response rate. During active A/F control, the ECM forcibly increases and decreases the injection volume a certain amount, based on the stoichiometric air fuel ratio learned during normal air fuel ratio control, and measures the air fuel ratio sensor response rate. The ECM receives a signal from the air fuel ratio sensor while performing active A/F control and uses it to calculate the air fuel ratio sensor response rate deterioration level.

If the value for air fuel ratio sensor response rate deterioration level is beyond the threshold, the ECM interprets this as a malfunction and sets the DTC.

Scheme 476

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

HINT

This confirmation driving pattern is used in the "Perform Confirmation Driving Pattern" procedure of the following diagnostic troubleshooting procedure.

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

Scheme 477

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-phv__dtc-checkclear) .
5. Turn the power switch off and wait for 30 seconds.
6. Turn the power switch on (IG) and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor.
8. Check that the Status2 of O2 Sensor is Incomplete.
9. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) .
10. Start the engine and warm it up (until the engine coolant temperature is 75°C (167°F) or higher) [A].
11. Drive the vehicle at a constant speed of between 47 and 62 mph (75 and 100 km/h) for 10 minutes [B].
12. Those items will change to Complete after completing the drive pattern.
13. If the values indicated on the Techstream do not change, perform Readiness Monitor Drive Pattern for the air fuel ratio sensor and heated oxygen sensor. Refer to «READINESS MONITOR DRIVE PATTERN»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__readiness-monitor-drive-pattern) .
14. Check the monitor result values on the Techstream by entering the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor / Details / RANGE B1S1.
15. Note the value of the Monitor Result.
16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
17. Read the pending DTC [C].
18. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
19. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
20. Input the DTC: P2A00.
21. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions 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] again.
22. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
23. 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.
24. 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-phv__dtc-checkclear) . 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-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 output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream.

HINT

1. The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.

1. Each sensor reacts in accordance with increases in the fuel injection volume.

Note. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case Air Fuel Ratio Sensor (Sensor 1) Output Voltage Heated Oxygen Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit 3 Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich)

1. Performing Control the Injection Volume for A/F Sensor enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.
2. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2.

HINT

1. DTC P2A00 may also be set when the air fuel ratio remains rich or lean.
2. A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
3. A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
4. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00) 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 P2A00 is output A DTC P2A00 and other DTCs are output B HINT: If any DTCs other than P2A00 are output, troubleshoot those DTCs first. B --> See step 13 A: Go to next step
2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE). Refer to «PROCEDURE - Step 1»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv) NG --> See step 14 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) See step 1 NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM) OK: Go to next step
4. PERFORM CONFIRMATION DRIVING PATTERN Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
5. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the Pending DTCs. Result Result Proceed to DTC P2A00 is output A DTC is not output B B --> See step 15 A: Go to next step
6. 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-phv) . NEXT: Go to next step
7. PERFORM CONFIRMATION DRIVING PATTERN Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P2A00) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the Pending DTCs. Result Result Proceed to DTC P2A00 is output A DTC is not output B B --> END A: Go to next step
9. 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-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 11 A: Go to next step
10. 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-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-phv__installation) . NG --> See step 16 OK: Go to next step
11. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT: Go to next step
12. 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-phv__dtc-checkclear) . 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-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: P2A00. Check the DTC judgment result. NEXT --> END
13. 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-phv__diagnostic-trouble-code-chart)
14. REPLACE AIR FUEL RATIO SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
15. 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-phv__check-for-intermittent-problems)
16. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv)

From the power management control ECU, the ECM receives data such as power output required for the engine (required output), estimated torque produced by the engine (estimated torque), engine speed of control target (target speed), and whether the engine is in start mode or not. Then, based on the required output and target speed, the ECM calculates a target torque that is to be produced by the engine and compares it with the estimated torque. If the estimated torque is very low compared with the target torque, or the engine start mode continues for the specific duration calculated by the coolant temperature, an abnormal condition is detected.

The ECM and power management control ECU are connected by a communication line called CAN. The ECM sends engine speed data and other data to the power management control ECU while the power management control ECU sends the information such as a requirement for the engine power to the ECM using the CAN communication line. When the communication between the ECM and power management control ECU is normal and the following items become a specified condition, the ECM illuminates the MIL and sets a DTC.

1. Engine speed
2. Target torque
3. Ratio of target torque against estimated torque
4. Fuel level

P3190

P3191

HINT

1. Repeating this inspection for symptom confirmation may cause the SOC to drop, preventing the system from entering the READY-on state. In this case, use the THS charger to charge the HV battery.
2. Cranking the engine once causes the SOC to drop approximately 1%.
3. Charging the HV battery once (10 minutes) using the THS charger restores the SOC approximately 2%.
4. Charging the HV battery using the THS charger takes approximately 10 minutes when the battery temperature is 25°C (77°F) or approximately 30 minutes when the battery temperature is 0°C (32°F).
5. The THS charger is a supplemental charging device that charges the HV battery enough to enable the engine to start (the vehicle can enter the READY-on state).
6. 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 P3190, P3191 AND/OR P3193) 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 P3190, P3191 and/or P3193 are output A DTC P3190, P3191 and/or P3193, and other DTCs are output B HINT: If any other codes besides P3190, P3191 and/or P3193 are output, perform troubleshooting for those DTCs first. B --> See step 18 A: Go to next step
2. CHECK SHORTAGE OF FUEL NG --> REFILL FUEL 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-phv) . OK No leaks in intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
4. CHECK FOR UNUSUAL NOISE OR VIBRATION WHEN STARTING ENGINE OR REVVING UP OK Unusual noise and vibration do not occur. NG --> REPAIR OR REPLACE MALFUNCTIONING PART OK: Go to next step
5. 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-phv) . NG --> See step 17 OK: Go to next step
6. INSPECT FREEZE FRAME DATA 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 / Freeze Frame Data. Calculate the requested torque* and compare it with Actual Engine Torque. HINT: *: The requested torque is calculated by putting "Requested Engine Torque" and "HV Target Engine Speed" from the freeze frame data into the following formula: Requested torque = Requested Engine Torque (kW) / HV Target Engine Speed (rpm) x 6112 Standard Actual Engine Torque is 60% or more of the request torque. Result Result Proceed to NG A OK B B --> See step 8 A: Go to next step
7. INSPECT THROTTLE BODY ASSEMBLY Inspect the throttle body assembly. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NG --> See step 22 OK: Go to next step
8. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY Inspect the mass air flow meter sub-assembly. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NG --> See step 19 OK: Go to next step
9. INSPECT ENGINE COOLANT TEMPERATURE SENSOR Inspect the engine coolant temperature sensor. Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NG --> See step 20 OK: Go to next step
10. INSPECT CRANKSHAFT POSITION SENSOR Inspect the crankshaft position sensor. Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NG --> See step 21 OK: Go to next step
11. REPLACE CAMSHAFT POSITION SENSOR Replace the camshaft position sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT: Go to next step
12. CHECK WHETHER DTC OUTPUT RECURS (DTC P3190, P3191 OR P3193) 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-phv__dtc-checkclear) . Turn the power switch off. 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-phv) . Start the engine. Allow the engine to idle for 10 seconds or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. Result Result Proceed to P3190, P3191 or P3193 is output A DTC is not output B B --> END A: Go to next step
13. 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-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 15 A: Go to next step
14. 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-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-phv__installation) . NG --> See step 24 OK: Go to next step
15. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT: Go to next step
16. 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-phv__dtc-checkclear) . 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-phv) . Start the engine. Allow the engine to idle for 10 seconds or more. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P3190, P3191 or P3193. Check the DTC judgment result. NEXT --> END
17. CHECK FUEL LINE Check the fuel lines for leaks or blockage. NG --> REPAIR OR REPLACE FUEL LINE OK --> See step 23
18. 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-phv__diagnostic-trouble-code-chart)
19. 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-phv)
20. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
21. REPLACE CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
22. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
23. REPLACE FUEL PUMP. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-phv)
24. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv)

The Controller Area Network (CAN) is a serial data communication system for real-time application. It is a multiplex communication system designed for on-vehicle use that provides a superior communication speed of 500 kbps and a capability to detect malfunctions. Through the combination of the CANH and CANL, and CANP and CANN bus lines, the CAN is able to maintain communication based on differential voltage.

Scheme 478

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-phv__dtc-checkclear) .
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 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: U0293.
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 steps [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-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 479

Refer to the CAN Communication System. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

RELATED DTCS

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

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

The ECM monitors the condition of both the key-off monitor and purge flow monitor to ensure proper operation of the EVAP system.

Scheme 480

TEXT IN ILLUSTRATION

Scheme 481

TEXT IN ILLUSTRATION

Scheme 482

TEXT IN ILLUSTRATION

Scheme 483

HINT

Standard atmospheric pressure is 101.3 kPa (760 mmHg-a)

Scheme 484

Scheme 485

Key-off Monitor

This monitoring system checks for canister pump module malfunctions and leaks from the EVAP and closed tank systems. Be sure to leave the vehicle for at least 5 hours to sufficiently cool the fuel and stabilize fuel tank pressure. This makes EVAP system monitoring more accurate.

HINT

If the engine coolant temperature is 50°C (122°F) or more, 5 hours after the power switch has been turned off, the ECM will begin performing a monitor check after another 2 hours. If the engine coolant temperature is still 50°C (122°F) or more, 7 hours after the power switch has been turned off, the ECM will begin performing a monitor check after another 2.5 hours.

There are two methods for monitoring the EVAP system.

1. If the fuel tank pressure is higher or lower than the atmospheric pressure, the system determines that there are no leaks in the closed tank system and the system will check for leaks from the piping and canister between the purge VSV and canister pump module. (Method A)
2. If the fuel tank pressure is almost the same as the atmospheric pressure, vacuum will be allowed to enter the fuel tank and the system will check for leaks from the fuel tank after checking for leaks from the canister. (Method B)

Scheme 486

Scheme 487

HINT

*: If there is only a small amount of fuel in the fuel tank, stabilizing the EVAP pressure takes longer than usual.

Scheme 488

TEXT IN ILLUSTRATION

Purge Flow Monitor

If the EVAP system pressure change is less than 1 kPa (7.5 mmHg) when the engine is running and the purge VSV is turned on (closed), the ECM determines that the purge flow is insufficient.

Scheme 489

TEXT IN ILLUSTRATION

Scheme 490

Scheme 491

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

Scheme 492

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Scheme 514

1. CONFIRM DTC Turn the power switch off and wait 10 seconds. Turn the power switch on (IG). Turn the power switch off and wait 10 seconds. 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. Confirm the DTCs and freeze frame data. EVAP RELATED DTCS DTC No. Monitoring Item P043E Reference orifice low flow P043F Reference orifice high flow P0441 Purge VSV stuck closed Purge VSV stuck open Insufficient purge flow P1420 Small leak from canister P1421 Gross leak from canister P1422 Small leak from fuel tank P1423 Gross leak from fuel tank P2401 Vacuum pump stuck OFF P2402 Vacuum pump stuck ON P2419 Vent valve stuck ON (closed) P2420 Vent valve stuck OFF (vent) P2450 Fuel vapor-containment valve stuck open P2451 Fuel vapor-containment valve stuck closed DTC AND MALFUNCTION CROSS-REFERENCE Malfunction Output DTC Reference orifice low flow P043E, P043F, P2401, P2402, P2419 Reference orifice high flow P043E, P043F, P2401, P2402, P2419 Vacuum pump stuck OFF P043E, P043F, P2401, P2402, P2419 Vacuum pump stuck ON P043E, P043F, P2401, P2402, P2419 Vent valve stuck ON (closed) P043E, P043F, P2401, P2402, P2419 Vent valve stuck OFF (vent) P2420 Insufficient purge flow P0441 Purge VSV stuck open P0441, P1421 Purge VSV stuck closed P0441 Small leak from canister P1420 Gross leak from canister P0441, P1421 Small leak from fuel tank P1422 Gross leak from fuel tank P1423 Fuel vapor-containment valve stuck open P1423, P2450 Fuel vapor-containment valve stuck closed P2451 NEXT: Go to next step
2. PERFORM EVAPORATIVE SYSTEM CHECK (AUTOMATIC MODE) NOTE: The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F). Clear the DTCs with the Techstream. Remove the fuel tank cap and reinstall the fuel cap. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode. After the Evaporative System Check is completed, check for pending DTCs. Result DTC Conclusion Proceed to A pending DTC is set A malfunction occurs and troubleshooting can be performed A A pending DTC is not set No malfunctions occur and it is difficult to perform troubleshooting B A pending DTC is not set and any of the current DTCs (P1422, P1423, or P2450) is set DTCs can be set because the fuel tank cap is not tightened firmly C C --> END B --> See step 45 A: Go to next step
3. IDENTIFY TROUBLE AREAS USING DTC Refer to the table below to determine the next procedure according to the output DTCs. Result Malfunction Output DTC Proceed to Reference orifice low flow P043E, P043F, P2401, P2402 and P2419 B Reference orifice high flow P043E, P043F, P2401, P2402 and P2419 B Vacuum pump stuck off P043E, P043F, P2401, P2402 and P2419 B Vacuum pump stuck on P043E, P043F, P2401, P2402 and P2419 B Vent valve stuck on (closed) P043E, P043F, P2401, P2402 and P2419 B Vent valve stuck off (vent) P2420 C Insufficient purge flow P0441 A Purge VSV stuck open P0441 and P1421 A Purge VSV stuck closed P0441 A Small leak from canister P1420 D Gross leak from canister P0441 and P1421 A Small leak from fuel tank P1422 A Gross leak from fuel tank P1423 A Fuel vapor-containment valve stuck open P1423 and P2450 A Fuel vapor-containment valve stuck closed P2451 A D --> See step 6 C --> See step 16 B --> See step 11 A: Go to next step
4. IDENTIFY TROUBLE AREAS USING DTC Refer to the table below to determine the next procedure according to the output DTCs. Result Malfunction Output DTC Proceed to Insufficient purge flow P0441 A Purge VSV stuck open P0441, P1421 B Purge VSV stuck closed P0441 A Gross leak from canister P0441, P1421 B Small leak from fuel tank P1422 C Gross leak from fuel tank P1423 C Fuel vapor-containment valve stuck open P1423, P2450 C Fuel vapor-containment valve stuck closed P2451 D D --> See step 26 C --> See step 24 B --> See step 16 A: Go to next step
5. CHECK VACUUM HOSE (PURGE VSV - INTAKE MANIFOLD) Disconnect the hose (connected to the intake manifold) from the purge VSV. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Use your finger to confirm that the hose has suction. TEXT IN ILLUSTRATION *1 Purge VSV *2 Hose (to Intake Manifold) Result Test Result Suspected Trouble Area Proceed to Suction applied EVAP hose between purge VSV and intake manifold normal A No suction Intake manifold port EVAP hose between purge VSV and intake manifold B Reconnect the hose. B --> See step 35 A: Go to next step
6. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL) 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-phv) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control. Disconnect the hose (connected to the canister) from the purge VSV. Using the Techstream, turn off the purge VSV (Activate the VSV for Evap Control: OFF). Use your finger to confirm that the purge VSV has no suction. Using the Techstream, turn on the purge VSV (Activate the VSV for Evap Control: ON). Use your finger to confirm that the purge VSV has suction. Result Test Result Suspected Trouble Area Proceed to Suction applied when purge VSV turned off Purge VSV stuck open ECM A No suction when purge VSV turned on Purge VSV stuck closed A No suction when purge VSV turned off, and suction applied when turned on Purge VSV normal B TEXT IN ILLUSTRATION *1 Purge VSV *2 Hose (to Canister) Reconnect the hose. B --> See step 22 A: Go to next step
7. CHECK PURGE VSV Remove the purge VSV. Apply compressed air to the purge VSV, and confirm that no air flows from A to B as shown in the illustration. Apply battery voltage to the purge VSV. While applying compressed air, confirm that air flows from A to B as shown in the illustration. TEXT IN ILLUSTRATION *1 Purge VSV Result Result Proceed to Air flows from A to B only when battery voltage applied to purge VSV. Conclusion: purge VSV is normal. A No air flows from A to B when battery voltage is applied to purge VSV. Conclusion: purge VSV is malfunctioning. B Air flows from A to B when battery voltage is not applied to purge VSV. Conclusion: purge VSV is malfunctioning. B Reinstall the purge VSV. B --> See step 30 A: Go to next step
8. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF PURGE VSV) Disconnect the purge VSV connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Result Tester Connection Switch Condition Specified Condition Suspected Trouble Area Proceed to D11-2 - Body ground Power switch on (IG) 11 to 14 V Normal OK Other than result above Wire harness or connectors between purge VSV and ECM NG TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Purge VSV) Reconnect the purge VSV connector. NG --> See step 38 OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM) Disconnect the ECM connector. Disconnect the purge VSV connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D28-28 (PRG) - D11-1 Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D28-28 (PRG) or D11-1 - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the purge VSV connector. NG --> See step 39 OK: Go to next step
10. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
11. CHECK CANISTER PUMP MODULE (VACUUM PUMP POWER SOURCE CIRCUIT) Turn the power switch off. Disconnect the No. 3 frame wire from the floor wire side connector. Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump. Turn the vacuum pump on using the Techstream. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R45-3 (MTRB) - R45-4 (MGND) Vacuum pump on 10 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Result Voltage Proceed to Out of standard range A Within standard range B Reconnect the No. 3 frame wire to the floor wire side connector. B --> See step 15 A: Go to next step
12. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - BODY GROUND) Disconnect the No. 3 frame wire from the floor wire side connector. Turn the power switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition R45-4 (MGND) - Body ground Always Below 1 ohms Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 40 OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the ECM connector. Disconnect the No. 3 frame wire from the floor wire side connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition A57-34 (MPMP) - R45-3 (MTRB) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A57-34 (MPMP) or R45-3 (MTRB) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 41 OK: Go to next step
14. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
15. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 3 - R45-3 (MTRB) Always Below 1 ohms No. 3 frame wire canister pump module side terminal 4 - R45-4 (MGND) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 3 or R45-3 (MTRB) - Body ground Always 10 kohms or higher No. 3 frame wire canister pump module side terminal 4 or R45-4 (MGND) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Canister Pump Module) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the canister pump module and floor wire side connectors. NG --> See step 42 OK: Go to next step
16. CHECK CANISTER PUMP MODULE (VENT VALVE POWER SOURCE CIRCUIT) Turn the power switch off. Disconnect the No. 3 frame wire from the floor wire side connector. Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump. Turn the vacuum pump on using the Techstream. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R45-5 (VLVB) - Body ground Vacuum pump on using the Techstream 10 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Result Voltage Proceed to Within standard range A Out of standard range B Reconnect the No. 3 frame wire to floor wire side connector. B --> See step 43 A: Go to next step
17. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 5 - R45-5 (VLVB) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 5 or R45-5 (VLVB) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Canister Pump Module) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the canister pump module and floor wire side connectors. NG --> See step 42 OK: Go to next step
18. INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION) Turn the power switch off. Disconnect the No. 3 frame wire from the canister pump module side connector. Apply battery voltage to VLVB and VGND terminals of the canister pump module. Touch the canister pump module to confirm the vent valve operation. TEXT IN ILLUSTRATION *a Component without harness connected (Canister) Result Test Result Suspected Trouble Area Proceed to Operating Wire harness between vent valve and ECM ECM A Not operating Vent valve B Reconnect the No. 3 frame wire to the canister pump module side connector. B --> See step 31 A: Go to next step
19. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the ECM connector. Disconnect the No. 3 frame wire from the floor wire side connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition A57-42 (VPMP) - R45-1 (VGND) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A57-42 (VPMP) or R45-1 (VGND) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 41 OK: Go to next step
20. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 1 - R45-1 (VGND) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 1 or R45-1 (VGND) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Canister Pump Module) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the canister pump module and floor wire side connectors. NG --> See step 42 OK: Go to next step
21. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
22. CHECK HOSES (PURGE VSV - CANISTER) Connect the EVAP pressure tester tool to the canister pump module with the adapter. TEXT IN ILLUSTRATION *1 Canister Pump Module *2 Adapter *3 EVAP Pressure Tester Tool - - Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Fuel Vapor-Containment Valve. Turn the fuel vapor-containment valve ON using the Techstream. Confirm good connection at the canister pump module. Pressurize the EVAP system to between 3.2 and 3.7 kPa (24 and 28 mmHg). NOTE: More than 4.7 kPa (35 mmHg) of pressure will damage the EVAP system. Pay attention to the pressure. Apply soapy water to the piping and connections of the EVAP system. Look for areas where bubbles appear. HINT: If the system has leaks, a whistling sound will be heard. Disconnect the hose between the canister and fuel tank from the canister. Close the canister on the area where the hose was connected and perform an inspection. The fuel tank and fuel vapor-containment valve can be eliminated from the suspected areas for leak checks. NEXT: Go to next step
23. REPLACE MALFUNCTIONING PART Repair or replace the leak point. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
24. CHECK FUEL TANK CAP ASSEMBLY Check if the fuel cap is tightened until a few "click" sounds are heard. If you have the EVAP pressure tester, check the fuel cap using the fuel cap adaptor. Install the fuel cap to the fuel cap adaptor, and connect the hose from the EVAP pressure tester's pump. Pressurize the fuel cap adaptor to between 3.2 and 3.7 kPa (24 and 28 mmHg) or for 45 seconds. Stop the pump and seal the fuel cap adaptor. Wait 2 minutes. Confirm that the pressure is higher than 2.0 kPa (15 mmHg). OK The pressure is higher than 2.0 kPa (15 mmHg) NG --> See step 34 OK: Go to next step
25. CHECK HOSES (FUEL VAPOR-CONTAINMENT VALVE - FUEL TANK) Connect the EVAP pressure tester tool to the canister pump module with the adapter. TEXT IN ILLUSTRATION *1 Canister Pump Module *2 Adapter *3 EVAP Pressure Tester Tool - - Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Fuel Vapor-Containment Valve. Turn the fuel vapor-containment valve ON using the Techstream. Confirm good connection at the canister pump module. Pressurize the EVAP system to between 3.2 and 3.7 kPa (24 and 28 mmHg). NOTE: More than 4.7 kPa (35 mmHg) of pressure will damage the EVAP system. Pay attention to the pressure. Apply soapy water to the piping and connections of the EVAP system. Look for areas where bubbles appear. HINT: If the system has leaks, a whistling sound will be heard. NEXT: Go to next step
26. CHECK FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY (POWER SOURCE CIRCUIT) Turn the power switch off. Disconnect the No. 3 frame wire from the floor wire side connector. Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Fuel Vapor-Containment Valve. Turn the fuel vapor-containment valve ON using the Techstream. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R46-1 (CCV) - R46-2 (+B) Fuel vapor-containment valve ON 10 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Result Voltage Proceed to Out of standard range A Within standard range B Reconnect the No. 3 frame wire to the floor wire side connector. B --> See step 32 A: Go to next step
27. CHECK HARNESS AND CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE POWER SOURCE) Disconnect the No. 3 frame wire from the floor wire side 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 R46-2 (+B) - Body ground Power switch on (IG) 10 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 43 OK: Go to next step
28. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the ECM connector. Disconnect the No. 3 frame wire from the floor wire side connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D28-25 (CCV2) - R46-1 (CCV) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D28-25 (CCV2) or R46-1 (CCV) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 41 OK: Go to next step
29. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
30. REPLACE PURGE VSV Replace the purge VSV. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
31. REPLACE CANISTER Replace the canister. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
32. CHECK HARNESS AND CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE - FLOOR WIRE) Disconnect the No. 3 frame wire from the fuel vapor-containment valve and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire fuel vapor-containment valve side terminal 2 - R46-2 (+B) Always Below 1 ohms No. 3 frame wire fuel vapor-containment valve side terminal 1 - R46-1 (CCV) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire fuel vapor-containment valve side terminal 2 or R46-2 (+B) - Body ground Always 10 kohms or higher No. 3 frame wire fuel vapor-containment valve side terminal 1 or R46-1 (CCV) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Fuel Vapor-Containment Valve) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the fuel vapor-containment valve and floor wire side connectors. NG --> See step 44 OK: Go to next step
33. REPLACE FUEL VAPOR-CONTAINMENT VALVE Replace the fuel vapor-containment valve. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
34. REPLACE FUEL TANK CAP ASSEMBLY Replace the fuel tank cap assembly. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
35. INSPECT INTAKE MANIFOLD (EVAP PURGE PORT) Stop the engine. Disconnect the EVAP hose from the intake manifold. 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-phv) . Start the engine. Use your finger to confirm that the port of the intake manifold has suction. Result Test Result Suspected Trouble Area Proceed to Suction applied EVAP hose between intake manifold and purge VSV A No suction Intake manifold B Reconnect the EVAP hose. B --> See step 37 A: Go to next step
36. REPAIR OR REPLACE EVAP HOSE (INTAKE MANIFOLD - PURGE VSV) Repair or replace the EVAP hose. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
37. REPAIR OR REPLACE INTAKE MANIFOLD (EVAP PURGE PORT) Check that the EVAP purge port of the intake manifold is not clogged. If necessary, replace the intake manifold. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
38. REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - EFI MAIN RELAY) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
39. REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - ECM) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
40. REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - BODY GROUND) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
41. REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - ECM) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
42. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER POMP MODULE - FLOOR WIRE) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
43. REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - EFI MAIN RELAY) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
44. REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE - FLOOR WIRE) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
45. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE) HINT: In the manual operation check, the EVAP system can be checked in several steps. Valve operation and pressure in each step can also be checked. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . Remove the fuel tank cap and reinstall the fuel tank cap. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Manual Mode. NOTE: The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes. Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F). TESTER DISPLAY Display Detail Atmosphere Press Check The number of steps and step names are displayed Purge VSV Purge VSV condition is displayed: ON (Open)/OFF (Closed) Vent Valve Vent valve condition is displayed: ON (Closed)/OFF (Vent) Vacuum Pump Vacuum pump condition is displayed: ON/OFF Fuel VCV Fuel vapor-containment valve condition is displayed: ON (Open)/OFF (Closed) Tank Pressure Fuel tank pressure (Absolute pressure) Vapor Pressure (Gauge) EVAP pressure (Gauge pressure measured at canister pump module) Vapor Pressure (Absolute) EVAP pressure (Absolute pressure measured at canister pump module) Time (Step) Elapsed time for each step Time (VENT) Accumulated purge VSV open time Time (PUMP) Accumulated vacuum pump operating time MANUAL OPERATION STEP Step Operations 1. Atmosphere Pressure Check Atmospheric pressure measurement 2. Reference Pressure (0.02 inch) Check 1 First reference leak pressure measurement 3. Canister Leak Check EVAP system pressure measurement 4. Purge VSV Check Purge VSV monitor 5. Reference Pressure (0.02 inch) Check 2 Second reference leak pressure measurement 6. Resetting Resetting 7. Tank Leak Check Fuel tank pressure measurement 8. Reference Pressure (0.02 inch) Check 3 Third reference leak pressure measurement 9. Atmosphere Pressure Check Atmospheric pressure measurement NEXT: Go to next step
46. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE STEP 1) Select step 1 and wait 10 seconds. NEXT: Go to next step
47. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE STEP 2) Perform step 2. Check the evaporative pressure 2 seconds after the vacuum pump is activated*. (step b) *: The vacuum pump begins to operate at the start of step 2. Check the evaporative (EVAP) pressure again when it has stabilized. This pressure is the first reference pressure standard. Result Test Result Suspected Trouble Area Proceed to EVAP pressure in step (b) is between 96.4 kPa (723.19 mmHg) and 100 kPa (751.6 mmHg) Not yet determined A EVAP pressure in step (b) is 100 kPa (751.6 mmHg) or more Reference orifice high-flow Vacuum pump stuck off B EVAP pressure in step (b) is below 96.4 kPa (723.19 mmHg) Reference orifice clogged C C --> See step 81 B --> See step 61 A: Go to next step
48. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE STEP 3) Perform step 3. Check the evaporative (EVAP) pressure change in step 3. (step b) Result Test Result Suspected Trouble Area Proceed to EVAP pressure change in step (b) is 0.3 kPa (2.2 mmHg) or more Not yet determined A EVAP pressure change in step (b) is less than 0.3 kPa (2.2 mmHg) Vent valve (switching valve) stuck off B Check the fuel tank pressure change in step 3. Result Test Results Suspected Trouble Areas Proceed to Fuel tank pressure change in step (b) is less than 0.5 kPa (3.75 mmHg) Not yet determined A Fuel tank pressure change in step (b) is more than 0.5 kPa (3.75 mmHg) Fuel vapor-containment valve stuck on (open) C Check the evaporative pressure again when it has stabilized. This pressure is the canister leak pressure standard. Compare the first reference pressure with the canister leak pressure. Result Test Result Suspected Trouble Area Proceed to Lower than first reference pressure Not yet determined A First reference pressure or higher Purge VSV stuck open Leakage from line between purge VSV and canister D D --> See step 72 C --> See step 76 B --> See step 66 A: Go to next step
49. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE STEP 4) Perform step 4. Check the evaporative (EVAP) pressure change in step 4. (step b) Result Test Result Suspected Trouble Area Proceed to EVAP pressure in step (b) changes to 101 kPa (762 mmHg) or more Not yet determined A EVAP pressure in step (b) remains below 101 kPa (762 mmHg) Purge VSV stuck closed B B --> See step 55 A: Go to next step
50. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE STEP 5) Perform step 5 and wait 60 seconds. Check the evaporative (EVAP) pressure. This pressure is the second reference pressure standard. NEXT: Go to next step
51. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE STEP 6) Perform step 6 and wait 5 seconds. NEXT: Go to next step
52. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE STEP 7) Perform step 7. Check that the tank pressure and EVAP pressure change. Check the tank pressure again when it has stabilized. This pressure is the fuel tank leak pressure standard. Result Test Result Suspected Trouble Area Proceed to Tank pressure change is more than 0.5 kPa (3.75 mmHg) and EVAP pressure is more than 0.9 kPa (6.76 mmHg) Not yet determined A Tank pressure change is less than 0.5 kPa (3.75 mmHg) and EVAP pressure is less than 0.9 kPa (6.76 mmHg) Fuel vapor-containment valve stuck OFF (closed) B B --> See step 76 A: Go to next step
53. PERFORM EVAPORATIVE SYSTEM CHECK (MANUAL MODE STEP 8) Perform step 8 and wait 60 seconds. Check the evaporative (EVAP) pressure. This pressure is the third reference pressure standard. Compare the tank pressure checked in step 41 with the third reference pressure. Result Test Result Suspected Trouble Area Proceed to Lower than third reference pressure Not yet determined A Third reference pressure or higher Leakage from line between fuel vapor-containment valve and fuel tank B B --> See step 74 A: Go to next step
54. PERFORM CONFIRMATION DRIVING PATTERN KEY-OFF MONITOR DRIVE PATTERN Connect the Techstream to the DLC3. Confirm the following conditions are satisfied: The fuel level is less than 90%. The altitude is less than 7874 ft. (2400 m). The vehicle is stopped (the vehicle speed is less than 2 mph). The engine coolant temperature is 4.4 to 35°C (40 to 95°F) The intake air temperature is 4.4 to 35°C (40 to 95°F) Perform the following drive pattern: Allow the engine to idle for 5 minutes or more. Turn the power switch off and wait 6 hours. Check the monitor status with the Techstream. Purge Flow Monitor Drive Pattern (P0441) Connect the Techstream to the DLC3. Confirm that the following conditions are satisfied: The engine coolant temperature is more than 4.4°C (40°F). The intake air temperature is more than 4.4°C (40°F). Perform the following drive pattern: Remove and reinstall the fuel cap to release the fuel tank pressure. Warm up the engine until the engine coolant temperature reaches 75°C (167°F) or more. Run the engine at 3000 rpm once. Check the monitor status with the Techstream. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
55. CHECK VACUUM HOSE (PURGE VSV - INTAKE MANIFOLD) Disconnect the hose (connected to the intake manifold) from the purge VSV. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Use your finger to confirm that the hose has suction. TEXT IN ILLUSTRATION *1 Purge VSV *2 Hose (to Intake Manifold) Result Test Result Suspected Trouble Area Proceed to Suction applied EVAP hose between purge VSV and intake manifold normal A No suction Intake manifold port EVAP hose between purge VSV and intake manifold B Reconnect the hose. B --> See step 85 A: Go to next step
56. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL) 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-phv) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control. Disconnect the hose (connected to the canister) from the purge VSV. Using the Techstream, turn off the purge VSV (Activate the VSV for Evap Control: OFF). Use your finger to confirm that the purge VSV has no suction. Using the Techstream, turn on the purge VSV (Activate the VSV for Evap Control: ON). Use your finger to confirm that the purge VSV has suction. Result Test Result Suspected Trouble Area Proceed to Suction applied when purge VSV turned off Purge VSV stuck open ECM A No suction when purge VSV turned on Purge VSV stuck closed A No suction when purge VSV turned off, and suction applied when turned on Purge VSV normal B TEXT IN ILLUSTRATION *1 Purge VSV *2 Hose (to Canister) Reconnect the hose. B --> See step 72 A: Go to next step
57. CHECK PURGE VSV Remove the purge VSV. Apply compressed air to the purge VSV, and confirm that no air flows from A to B as shown in the illustration. Apply battery voltage to the purge VSV. While applying compressed air, confirm that air flows from A to B as shown in the illustration. TEXT IN ILLUSTRATION *1 Purge VSV Result Result Proceed to Air flows from A to B only when battery voltage applied to purge VSV. Conclusion: purge VSV is normal. A No air flows from A to B when battery voltage is applied to purge VSV. Conclusion: purge VSV is malfunctioning. B Air flows from A to B when battery voltage is not applied to purge VSV. Conclusion: purge VSV is malfunctioning. B Reinstall the purge VSV. B --> See step 80 A: Go to next step
58. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF PURGE VSV) Disconnect the purge VSV connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Result Tester Connection Switch Condition Specified Condition Suspected Trouble Area Proceed to D11-2 - Body ground Power switch on (IG) 11 to 14 V Normal OK Other than result above Wire harness or connectors between purge VSV and ECM NG TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Purge VSV) Reconnect the purge VSV connector. NG --> See step 88 OK: Go to next step
59. CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM) Disconnect the ECM connector. Disconnect the purge VSV connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D28-28 (PRG) - D11-1 Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D28-28 (PRG) or D11-1 - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the purge VSV connector. NG --> See step 89 OK: Go to next step
60. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
61. CHECK CANISTER PUMP MODULE (VACUUM PUMP POWER SOURCE CIRCUIT) Turn the power switch off. Disconnect the No. 3 frame wire from the floor wire side connector. Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump. Turn the vacuum pump on using the Techstream. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R45-3 (MTRB) - R45-4 (MGND) Vacuum pump on 10 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Result Voltage Proceed to Out of standard range A Within standard range B Reconnect the No. 3 frame wire to the floor wire side connector. B --> See step 65 A: Go to next step
62. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - BODY GROUND) Disconnect the No. 3 frame wire from the floor wire side connector. Turn the power switch off. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition R45-4 (MGND) - Body ground Always Below 1 ohms Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 90 OK: Go to next step
63. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the ECM connector. Disconnect the No. 3 frame wire from the floor wire side connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition A57-34 (MPMP) - R45-3 (MTRB) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A57-34 (MPMP) or R45-3 (MTRB) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 91 OK: Go to next step
64. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
65. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 3 - R45-3 (MTRB) Always Below 1 ohms No. 3 frame wire canister pump module side terminal 4 - R45-4 (MGND) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 3 or R45-3 (MTRB) - Body ground Always 10 kohms or higher No. 3 frame wire canister pump module side terminal 4 or R45-4 (MGND) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Canister Pump Module) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the canister pump module and floor wire side connectors. NG --> See step 92 OK: Go to next step
66. CHECK CANISTER PUMP MODULE (VENT VALVE POWER SOURCE CIRCUIT) Turn the power switch off. Disconnect the No. 3 frame wire from the floor wire side connector. Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump. Turn the vacuum pump on using the Techstream. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R45-5 (VLVB) - Body ground Vacuum pump turned on using the Techstream 10 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Result Voltage Proceed to Within standard range A Out of standard range B Reconnect the No. 3 frame wire to floor wire side connector. B --> See step 93 A: Go to next step
67. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 5 - R45-5 (VLVB) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 5 or R45-5 (VLVB) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Canister Pump Module) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the canister pump module and floor wire side connectors. NG --> See step 92 OK: Go to next step
68. CHECK HARNESS AND CONNECTOR (VENT VALVE - BODY GROUND) Turn the power switch off. Disconnect the No. 3 frame wire from the canister pump module side connector. Apply battery voltage to VLVB and VGND terminals of the canister pump module. Touch the canister pump module to confirm the vent valve operation. TEXT IN ILLUSTRATION *a Component without harness connected (Canister) Result Test Result Suspected Trouble Area Proceed to Operating Wire harness between vent valve and ECM ECM A Not operating Vent valve B Reconnect the No. 3 frame wire to the canister pump module side connector. B --> See step 81 A: Go to next step
69. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the ECM connector. Disconnect the No. 3 frame wire from the floor wire side connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition A57-42 (VPMP) - R45-1 (VGND) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A57-42 (VPMP) or R45-1 (VGND) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 91 OK: Go to next step
70. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 1 - R45-1 (VGND) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 1 or R45-1 (VGND) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Canister Pump Module) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the canister pump module and floor wire side connectors. NG --> See step 92 OK: Go to next step
71. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
72. CHECK HOSES (PURGE VSV - CANISTER) Connect the EVAP pressure tester tool to the canister pump module with the adapter. TEXT IN ILLUSTRATION *1 Canister Pump Module *3 EVAP Pressure Tester Tool Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Fuel Vapor-Containment Valve. Turn the fuel vapor-containment valve ON using the Techstream. Confirm good connection at the canister pump module. Pressurize the EVAP system to between 3.2 and 3.7 kPa (24 and 28 mmHg). NOTE: More than 4.7 kPa (35 mmHg) of pressure will damage the EVAP system. Pay attention to the pressure. Apply soapy water to the piping and connections of the EVAP system. Look for areas where bubbles appear. HINT: If the system has leaks, a whistling sound will be heard. Disconnect the hose between the canister and fuel tank from the canister. Close the canister on the area where the hose was connected and perform an inspection. The fuel tank and fuel vapor-containment valve can be eliminated from the suspected areas for leak checks. NEXT: Go to next step
73. REPLACE MALFUNCTIONING PART Repair or replace the leak point. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
74. CHECK FUEL TANK CAP ASSEMBLY Check if the fuel cap is tightened until a few "click" sounds are heard. If you have the EVAP pressure tester, check the fuel cap using the fuel cap adaptor. Install the fuel cap to the fuel cap adaptor, and connect the hose from the EVAP pressure tester's pump. Pressurize the fuel cap adaptor to between 3.2 and 3.7 kPa (24 and 28 mmHg) or for 45 seconds. Stop the pump and seal the fuel cap adaptor. Wait 2 minutes. Confirm that the pressure is higher than 2.0 kPa (15 mmHg). OK The pressure is higher than 2.0 kPa (15 mmHg) NG --> See step 84 OK: Go to next step
75. CHECK HOSES (FUEL VAPOR-CONTAINMENT VALVE - FUEL TANK) Connect the EVAP pressure tester tool to the canister pump module with the adapter. TEXT IN ILLUSTRATION *1 Canister Pump Module *2 Adapter *3 EVAP Pressure Tester Tool - - Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Fuel Vapor-Containment Valve. Turn the fuel vapor-containment valve ON using the Techstream. Confirm good connection at the canister pump module. Pressurize the EVAP system to between 3.2 and 3.7 kPa (24 and 28 mmHg). NOTE: More than 4.7 kPa (35 mmHg) of pressure will damage the EVAP system. Pay attention to the pressure. Apply soapy water to the piping and connections of the EVAP system. Look for areas where bubbles appear. HINT: If the system has leaks, a whistling sound will be heard. NEXT: Go to next step
76. CHECK FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY (POWER SOURCE CIRCUIT) Turn the power switch off. Disconnect the No. 3 frame wire from the floor wire side connector. Connect the Techstream to the DLC3. Turn the power switch on (IG). Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Fuel Vapor-Containment Valve. Turn the fuel vapor-containment valve ON using the Techstream. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R46-1 (CCV) - R46-2 (+B) Fuel vapor-containment valve ON 10 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Result Voltage Proceed to Out of standard range A Within standard range B Reconnect the No. 3 frame wire to the floor wire side connector. B --> See step 82 A: Go to next step
77. CHECK HARNESS AND CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE POWER SOURCE) Disconnect the No. 3 frame wire from the floor wire side 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 R46-2 (+B) - Body ground Power switch on (IG) 10 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 93 OK: Go to next step
78. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the ECM connector. Disconnect the No. 3 frame wire from the floor wire side connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D28-25 (CCV2) - R46-1 (CCV) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D28-25 (CCV2) or R46-1 (CCV) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 3 frame wire to the floor wire side connector. NG --> See step 91 OK: Go to next step
79. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
80. REPLACE PURGE VSV Replace the purge VSV. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
81. REPLACE CANISTER Replace the canister. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
82. CHECK HARNESS AND CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE - FLOOR WIRE) Disconnect the No. 3 frame wire from the fuel vapor-containment valve and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire fuel vapor-containment valve side terminal 2 - R46-2 (+B) Always Below 1 ohms No. 3 frame wire fuel vapor-containment valve side terminal 1 - R46-1 (CCV) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire fuel vapor-containment valve side terminal 2 or R46-2 (+B) - Body ground Always 10 kohms or higher No. 3 frame wire fuel vapor-containment valve side terminal 1 or R46-1 (CCV) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Fuel Vapor-containment Valve) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the fuel vapor-containment valve and floor wire side connectors. NG --> See step 94 OK: Go to next step
83. REPLACE FUEL VAPOR-CONTAINMENT VALVE Replace the fuel vapor-containment valve. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
84. REPLACE FUEL TANK CAP ASSEMBLY Replace the fuel tank cap assembly. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
85. INSPECT INTAKE MANIFOLD (EVAP PURGE PORT) Stop the engine. Disconnect the EVAP hose from the intake manifold. 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-phv) . Start the engine. Use your finger to confirm that the port of the intake manifold has suction. Result Test Result Suspected Trouble Area Proceed to Suction applied EVAP hose between intake manifold and purge VSV A No suction Intake manifold B Reconnect the EVAP hose. B --> See step 87 A: Go to next step
86. REPAIR OR REPLACE VACUUM HOSE (INTAKE MANIFOLD - PURGE VSV) Repair or replace EVAP hose. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
87. REPAIR OR REPLACE INTAKE MANIFOLD (EVAP PURGE PORT) Check that the EVAP purge port of the intake manifold is not clogged. If necessary, replace the intake manifold. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
88. REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - EFI MAIN RELAY) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
89. REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - ECM) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
90. REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - BODY GROUND) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
91. REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - ECM) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
92. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
93. REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - EFI MAIN RELAY) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)
94. REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE - FLOOR WIRE) Repair or replace harness or connector. NEXT --> PERFORM EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC MODE)

1. KEY-OFF MONITOR DRIVE PATTERN 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-phv) . Confirm that the following conditions are satisfied: The fuel level is less than 90%. The altitude is less than 7874 ft. (2400 m). The vehicle is stopped (the vehicle speed is 0 mph (0 km/h)). The engine coolant temperature is 4.4 to 35°C (40 to 95°F) The intake air temperature is 4.4 to 35°C (40 to 95°F) Perform the following drive pattern: Allow the engine to idle for 5 minutes or more. Turn the power switch off and wait 5, 7 or 9.5 hours. Check the monitor status with the Techstream.
2. PURGE FLOW MONITOR DRIVE PATTERN (P0441) 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-phv) . Confirm that the following conditions are satisfied: The engine coolant temperature is more than 4.4°C (40°F). The intake air temperature is more than 4.4°C (40°F). Perform the following drive pattern: Remove and reinstall the fuel cap to release the fuel tank pressure. Warm the engine until the engine coolant temperature reaches 75°C (167°F) or more. Run the engine at 2500 rpm once. Check the monitor status using the Techstream.

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

When the power switch is turned on (IG), battery voltage is applied to IGSW of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the No. 2 integration relay (EFI MAIN relay) and supplying power to either terminal +B and +B2 of the ECM.

Scheme 515

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

Scheme 516

Scheme 517

Scheme 518

1. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D28-104 (E1) - Body ground Always Below 1 ohms Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND) OK: Go to next step
2. INSPECT ECM (IGSW VOLTAGE) Disconnect the ECM connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition A57-28 (IGSW) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) Reconnect the ECM connector. NG --> See step 7 OK: Go to next step
3. INSPECT NO. 2 INTEGRATION RELAY (EFI MAIN RELAY) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1C-1 - 1B-4 No battery voltage applied between terminals 1B-2 and 1B-3 10 kohms or higher Battery voltage applied between terminals 1B-2 and 1B-3 Below 1 ohms TEXT IN ILLUSTRATION *a Component without harness connected (No. 2 Integration Relay) Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> See step 13 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (EFI MAIN RELAY) - ECM) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay 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 1B-4 - A57-1 (+B2) Always Below 1 ohms 1B-4 - A57-2 (+B) Always Below 1 ohms 1B-2 - A57-6 (MREL) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 1B-4 or A57-1 (+B2) - Body ground Always 10 kohms or higher 1B-4 or A57-2 (+B) - Body ground Always 10 kohms or higher 1B-2 or A57-6 (MREL) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 INTEGRATION RELAY (EFI MAIN RELAY) - ECM) OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (EFI MAIN RELAY) - BODY GROUND) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1B-3 - Body ground Always Below 1 ohms Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 INTEGRATION RELAY (EFI MAIN RELAY) - BODY GROUND) OK --> See step 6
6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__problem-symptoms-table)
7. INSPECT NO. 2 INTEGRATION RELAY (IG2 RELAY) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1C-1 - 1A-4 No battery voltage applied to terminals 1A-2 and 1A-3 10 kohms or higher Battery voltage applied to terminals 1A-2 and 1A-3 Below 1 ohms TEXT IN ILLUSTRATION *a Component without harness connected (No. 2 Integration Relay) Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> See step 14 OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - ECM) Disconnect the ECM connector. Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition 1A-4 - A57-28 (IGSW) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 1A-4 or A57-28 (IGSW) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - ECM) OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - BATTERY) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Disconnect the negative battery terminal. Disconnect the positive battery terminal. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition 1C-1 - Battery positive terminal Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 1C-1 or Battery positive terminal - Body ground Always 10 kohms or higher Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. Reconnect the positive battery terminal. Reconnect the negative battery terminal. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - BATTERY) OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - BODY GROUND) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1A-3 - Body ground Always Below 1 ohms Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - BODY GROUND) OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Disconnect the power management control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition A21-2 (IG2D) - 1A-2 Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition A21-2 (IG2D) or 1A-2 - Body ground Always 10 kohms or higher Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. Reconnect the power management control ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY) OK --> See step 12
12. CHECK SMART KEY SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(/toyota/prius-phv/pre-iii-2010-2011/remont/starter/#smart-key-system-keyless-start-diagnostics-introduction-phv__how-to-proceed-with-troubleshooting)
13. REPLACE NO. 2 INTEGRATION RELAY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
14. REPLACE NO. 2 INTEGRATION RELAY (IG2 RELAY). Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The ECM constantly uses 5 V from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.

Scheme 519

When the VC circuit is shorted, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.

HINT

Under normal conditions, the MIL is illuminated for several seconds when the power switch is first turned on (IG). The MIL goes off when the engine is started.

Scheme 520

Scheme 521

Scheme 522

Scheme 523

1. CHECK MIL Check that the Malfunction Indicator Lamp (MIL) illuminates when turning the power switch on (IG). OK MIL lights up. NG --> See step 2 OK --> See step 14
2. CHECK CONNECTION BETWEEN TECHSTREAM AND ECM Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Check the communication between the Techstream and ECM. Result Result Proceed to Communication is not possible A Communication is possible B B --> See step 15 A: Go to next step
3. CHECK MIL (THROTTLE POSITION SENSOR) Disconnect the throttle position sensor connector. Turn the power switch on (IG). Check the MIL. Result Result Proceed to MIL does not illuminate A MIL illuminates B Reconnect the throttle position sensor connector. B --> See step 16 A: Go to next step
4. CHECK MIL (CAMSHAFT POSITION SENSOR) Disconnect the camshaft position sensor connector. Turn the power switch on (IG). Check the MIL. Result Result Proceed to MIL does not illuminate A MIL illuminates B Reconnect the camshaft position sensor connector. B --> See step 17 A: Go to next step
5. CHECK MIL (MANIFOLD ABSOLUTE PRESSURE SENSOR) Disconnect the manifold absolute pressure sensor connector. Turn the power switch on (IG). Check the MIL. Result Result Proceed to MIL does not illuminate A MIL illuminates B Reconnect the manifold absolute pressure sensor connector. B --> See step 18 A: Go to next step
6. CHECK MIL (CANISTER PUMP MODULE) Disconnect the canister pump module connector. Turn the power switch on (IG). Check the MIL. Result Result Proceed to MIL does not illuminate A MIL illuminates B Reconnect the canister pump module connector. B --> See step 19 A: Go to next step
7. CHECK MIL (FUEL TANK PRESSURE SENSOR) Disconnect the fuel tank pressure sensor connector. Turn the power switch on (IG). Check the MIL. Result Result Proceed to MIL does not illuminate A MIL illuminates B B --> REPLACE FUEL TANK PRESSURE SENSOR A: Go to next step
8. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) Disconnect the throttle position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D28-88 (VCTA) or D4-5 (VC) - Body ground Always 10 kohms or higher Reconnect the throttle position sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE POSITION SENSOR - ECM) OK: Go to next step
9. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Disconnect the camshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D18-3 (VC) or D28-99 (VCV1) - Body ground Always 10 kohms or higher Reconnect the camshaft position sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (MANIFOLD ABSOLUTE PRESSURE SENSOR - ECM) Disconnect the manifold absolute pressure sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition D3-3 (VC) or D28-72 (VCPM) - Body ground Always 10 kohms or higher Reconnect the manifold absolute pressure sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MANIFOLD ABSOLUTE PRESSURE SENSOR - ECM) OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the No. 3 frame wire from the floor wire side connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition R45-6 (VCC) or D28-113 (VCPP) - Body ground Always 10 kohms or higher R45-2 (VC) or A57-57 (VPTK) - Body ground Always 10 kohms or higher Reconnect the No. 3 frame wire to the floor wire connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - ECM) OK: Go to next step
12. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 6 or R45-6 (VCC) - Body gound Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Canister Pump Module) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the canister pump module and floor wire side connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) OK: Go to next step
13. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - FLOOR WIRE) Disconnect the No. 3 frame wire from the fuel tank pressure sensor and floor wire side connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition No. 3 frame wire fuel tank pressure sensor side terminal 3 or R45-2 (VC) - Body ground Always 10 kohms or higher TEXT IN ILLUSTRATION *a Front view of the wire harness connector (to Fuel Tank Pressure Sensor) *b Front view of the wire harness connector (to Floor Wire) Reconnect the No. 3 frame wire to the fuel tank pressure sensor and floor wire side connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL TANK PRESSURE SENSOR - FLOOR WIRE) OK --> See step 20
14. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__problem-symptoms-table)
15. GO TO MIL CIRCUIT. Refer to «MIL Circuit»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p2102-u0293-circuit-tests-phv)
16. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
17. REPLACE CAMSHAFT POSITION SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
18. 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-phv)
19. REPLACE CANISTER. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv)
20. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

When the NE signal is input to the ECM, Tr is turned on, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.

While the NE signal is generated (engine running), the ECM keeps Tr on (circuit opening relay on) and the fuel pump also keeps operating.

Scheme 524

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

Scheme 525

1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE C/OPN RELAY) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed. Check whether the fuel pump operation sound occurs when performing the Active Test on the Techstream. OK Fuel pump operating sound occurs. NG --> See step 2 OK --> See step 9
2. INSPECT NO. 2 INTEGRATION RELAY (C/OPN RELAY) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1B-4 - 1B-8 No battery voltage applied to terminals 1B-6 and 1B-7 10 kohms or higher Battery voltage applied to terminals 1B-6 and 1B-7 Below 1 ohms TEXT IN ILLUSTRATION *a Component without harness connected (No. 2 Integration Relay) Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> See step 10 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition 1B-7 - A57-8 (FC) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 1B-7 or A57-8 (FC) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - ECM) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - IG2 RELAY) Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition 1A-4 - 1B-6 Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 1A-4 or 1B-6 - Body ground Always 10 kohms or higher Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - IG2 RELAY) OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP) Disconnect the fuel pump connector. Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition 1B-8 - R11-4 Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition 1B-8 or R11-4 - Body ground Always 10 kohms or higher Reconnect the fuel pump connector. Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - FUEL PUMP) OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND) Disconnect the fuel pump connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition R11-5 - Body ground Always Below 1 ohms Reconnect the fuel pump connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - BODY GROUND) OK: Go to next step
7. INSPECT FUEL PUMP Inspect the fuel pump. Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-phv) . NG --> See step 11 OK: Go to next step
8. CHECK ECM POWER SOURCE CIRCUIT Check the ECM power source circuit. Refer to «ECM Power Source Circuit»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p2102-u0293-circuit-tests-phv) . NG --> REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT OK --> See step 12
9. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__problem-symptoms-table)
10. REPLACE NO. 2 INTEGRATION RELAY (C/OPN RELAY). Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
11. REPLACE FUEL PUMP. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-phv)
12. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The fuel injectors are located on the intake manifold. They inject fuel into the cylinders based on the signals from the ECM.

Scheme 526

Scheme 527

1. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE) Disconnect the fuel injector assembly connectors. 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 D14-1 - Body ground Power switch on (IG) 11 to 14 V D15-1 - Body ground Power switch on (IG) 11 to 14 V D16-1 - Body ground Power switch on (IG) 11 to 14 V D17-1 - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Fuel Injector Assembly) Reconnect the fuel injector assembly connectors. NG --> See step 4 OK: Go to next step
2. INSPECT FUEL INJECTOR ASSEMBLY Inspect the fuel injector assembly. Refer to «INSPECTION»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-phv) . NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) Disconnect the fuel injector assembly connectors. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D14-2 - D28-85 (#10) Always Below 1 ohms D15-2 - D28-84 (#20) Always Below 1 ohms D16-2 - D28-83 (#30) Always Below 1 ohms D17-2 - D28-82 (#40) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D14-2 or D28-85 (#10) - Body ground Always 10 ohms or higher D15-2 or D28-84 (#20) - Body ground Always 10 ohms or higher D16-2 or D28-83 (#30) - Body ground Always 10 ohms or higher D17-2 or D28-82 (#40) - Body ground Always 10 ohms or higher Reconnect the fuel injector assembly connectors. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) OK --> See step 6
4. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - FUEL INJECTOR ASSEMBLY) Disconnect the fuel injector assembly connectors. Remove the No. 2 integration relay from the engine room relay block. Disconnect the No. 2 integration relay connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D14-1 - 1A-4 Always Below 1 ohms D15-1 - 1A-4 Always Below 1 ohms D16-1 - 1A-4 Always Below 1 ohms D17-1 - 1A-4 Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D14-1 or 1A-4 - Body ground Always 10 kohms or higher D15-1 or 1A-4 - Body ground Always 10 kohms or higher D16-1 or 1A-4 - Body ground Always 10 kohms or higher D17-1 or 1A-4 - Body ground Always 10 kohms or higher Reconnect the fuel injector assembly connectors. Reconnect the No. 2 integration relay connector. Reinstall the No. 2 integration relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 INTEGRATION RELAY (IG2 RELAY) - FUEL INJECTOR ASSEMBLY) OK --> See step 7
5. REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/fuel-system/#engine-fuel-system-service-information-phv)
6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__problem-symptoms-table)
7. CHECK ECM POWER SOURCE CIRCUIT. Refer to «ECM Power Source Circuit»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p2102-u0293-circuit-tests-phv)

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detected by the ECM. When the power switch is turned on (IG), power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.

The MIL operation can be checked visually: When the power switch is first turned on (IG), the MIL should illuminate and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the Techstream.

Scheme 528

Scheme 529

Scheme 530

1. CHECK THAT MIL IS ILLUMINATED Turn the power switch on (IG). Check the illumination of the MIL. Result Condition Proceed to MIL remains illuminated (Even after power switch is turned on (IG) and several seconds have passed, MIL still remains illuminated) A MIL remains off (Does not illuminate at all) B MIL illuminates for several seconds, but turns off after engine is started C C --> SYSTEM OK B --> See step 5 A: Go to next step
2. CHECK WHETHER MIL TURNS OFF 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. Check if any DTCs have been stored. Note down the DTCs. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . Check if the MIL goes off. OK MIL goes off. NG --> See step 3 OK --> See step 8
3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the ECM connector. TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) Turn the power switch on (IG). Check that the MIL is not illuminated. OK MIL is not illuminated. Reconnect the ECM connector. NG --> See step 4 OK --> See step 9
4. CHECK HARNESS AND CONNECTOR (NO. 3 METER CIRCUIT PLATE - ECM) Disconnect the No. 3 meter circuit plate 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 L27-25 (EFI) or A57-36 (W) - Body ground Always 10 kohms or higher Reconnect the No. 3 meter circuit plate connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 METER CIRCUIT PLATE - ECM) OK --> See step 10
5. CHECK THAT ENGINE STARTS Turn the power switch on (IG). Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Result Result Proceed to Engine starts A Engine cannot be put in inspection mode* (Engine cannot start) B HINT: *: The Techstream cannot communicate with the ECM. B --> See step 11 A: Go to next step
6. CHECK HARNESS AND CONNECTOR (ECM TERMINAL VOLTAGE) Disconnect the ECM connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition A57-36 (W) - Body ground Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) NG --> See step 7 OK --> See step 9
7. CHECK HARNESS AND CONNECTOR (NO. 3 METER CIRCUIT PLATE - ECM) Disconnect the No. 3 meter circuit plate 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 L27-25 (EFI) - A57-36 (W) Always Below 1 ohms Reconnect the ECM connector. Reconnect the No. 3 meter circuit plate connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 METER CIRCUIT PLATE - ECM) OK --> See step 10
8. REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__diagnostic-trouble-code-chart)
9. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
10. REPLACE NO. 3 METER CIRCUIT PLATE. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/gauges-instrument-panels/#meter-service-information-phv__disassembly)
11. GO TO VC OUTPUT CIRCUIT. Refer to «VC Output Circuit»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p2102-u0293-circuit-tests-phv)

See also:
• DTC CHECK / CLEAR
• INSPECTION MODE PROCEDURE
• REMOVAL
• CHECK FOR INTERMITTENT PROBLEMS
• DIAGNOSTIC TROUBLE CODE CHART
• CHECKING MONITOR STATUS
• REMOVAL
• INSTALLATION
• PROCEDURE - Step 1
• ON-VEHICLE INSPECTION
• ON-VEHICLE INSPECTION - Step 2
• INSPECTION
• REMOVAL
• READINESS MONITOR DRIVE PATTERN
• HOW TO PROCEED WITH TROUBLESHOOTING
• DTC P043E: Evaporative Emission System Reference Orifice Clog Up; DTC P043F: Evaporative Emission System Reference Orifice High Flow; DTC P2401: Evaporative Emission System Leak Detection Pump Control Circuit Low; DTC P2402: Evaporative Emission System Leak Detection Pump Control Circuit High; DTC P2419: Evaporative Emission System Switching Valve Control Circuit Low
• PROBLEM SYMPTOMS TABLE
• HOW TO PROCEED WITH TROUBLESHOOTING
• DISASSEMBLY
• WIRING DIAGRAM
• WIRING DIAGRAM