Engine Control (sfi) System (diagnostic Codes (p0327-p1451)) (phv) Toyota Prius PHV pre-III

DESCRIPTION

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

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

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

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

HINT

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

Reference: Inspection using an oscilloscope

Scheme 531

The correct waveform is as shown.

MONITOR DESCRIPTION

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

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

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

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

KNOCK SENSOR RANGE CHECK (LOW VOLTAGE) P0327

KNOCK SENSOR RANGE CHECK (HIGH VOLTAGE) P0328

Scheme 532

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 10 seconds.
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: P0327 or P0328.
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 5 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 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 533

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 534

Scheme 535

1. READ VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Knock Feedback Value. Read the value while driving the vehicle. OK The value changes. HINT: Malfunction does not occur Knock Feedback Value changes Malfunctions occur Knock Feedback Value does not change The knock feedback value change can be confirmed by running the engine with a high load, for example, by activating the air conditioning system and racing the engine. NG --> See step 2 OK --> See step 5
2. INSPECT ECM (KNK1 VOLTAGE) Disconnect the knock control sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition G1-2 - G1-1 Power switch on (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Knock Control Sensor) Reconnect the knock control sensor connector. NG --> See step 4 OK: Go to next step
3. INSPECT KNOCK CONTROL SENSOR Remove the knock control sensor. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 120 to 280 kohms TEXT IN ILLUSTRATION *1 Ohmmeter *a Component without harness connected (Knock Control Sensor) Reinstall the knock control sensor. NG --> See step 7 OK --> See step 6
4. CHECK HARNESS AND CONNECTOR (ECM - KNOCK CONTROL SENSOR) Disconnect the knock control sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition G1-2 - D28-87 (KNK1) Always Below 1 ohms G1-1 - D28-110 (EKNK) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition G1-2 or D28-87 (KNK1) - Body ground Always 10 kohms or higher G1-1 or D28-110 (EKNK) - Body ground Always 10 kohms or higher Reconnect the knock control sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - KNOCK CONTROL SENSOR) OK --> See step 6
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)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
7. REPLACE KNOCK CONTROL SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The crankshaft position sensor system consists of a crankshaft position sensor plate and a pickup coil.

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

Scheme 536

1. Reference: Inspection using an oscilloscope. HINT: The correct waveform is as shown. G2+ is camshaft position sensor signals, and NE+ is the crankshaft position sensor signal. A failure of the ground for the shielding of the wiring may result in noisy waveforms. ECM Terminal Name Between NE+ and NE- Between G2+ and G2- Tester Range 5 V/DIV., 20 ms./DIV. Condition Idling with warm engine

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

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

ALL

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

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

P0335: CRANKSHAFT POSITION SENSOR RANGE CHECK OR RATIONALITY

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

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

P0335: CRANKSHAFT POSITION SENSOR RANGE CHECK OR RATIONALITY

COMPONENT OPERATING RANGE

Scheme 537

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 or more [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: P0335.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-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 538

HINT

1. If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
2. Check the engine speed. The engine speed can be checked using the Techstream. To check, follow the operation below: Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. 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 / Data List / Engine Speed. The engine speed may be indicated as zero despite the engine rotating normally. This is caused by a lack of NE signals from the crankshaft position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crankshaft position sensor output voltage is insufficient.
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

Scheme 539

Scheme 540

1. READ VALUE USING TECHSTREAM (ENGINE SPEED) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed. Start the engine. Read the values displayed on the Techstream while the engine is running. OK Correct values are displayed. HINT: To check the engine speed change, display the graph on the Techstream. If the engine does not start, check the engine speed while cranking. If the engine speed indicated on the Techstream remains at zero (0), there may be an open or short in the crankshaft position sensor circuit. NG --> See step 2 OK --> See step 8
2. INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE) Disconnect the crankshaft position sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1 (NE) - 2 (NE-) Cold 1630 to 2740 ohms 1 (NE) - 2 (NE-) Hot 2065 to 3225 ohms HINT: "Cold" and "Hot" mean the temperature of the coils themselves. "Cold" is from -10 to 50°C (14 to 122°F) and "Hot" is from 50 to 100°C (122 to 212°F). If the resistance is not as specified, replace the sensor. TEXT IN ILLUSTRATION *a Component without harness connected (Crankshaft Position Sensor) Reconnect the crankshaft position sensor connector. NG --> See step 9 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Disconnect the crankshaft position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D27-1 (NE) - D28-74 (NE+) Always Below 1 ohms D27-2 (NE-) - D28-120 (NE-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D27-1 (NE) or D28-74 (NE+) - Body ground Always 10 kohms or higher D27-2 (NE-) or D28-120 (NE-) - Body ground Always 10 kohms or higher Reconnect the crankshaft position sensor connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) OK: Go to next step
4. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR) Check the crankshaft position sensor installation. OK Sensor is installed correctly. NG --> See step 10 OK: Go to next step
5. INSPECT NO. 1 CRANKSHAFT POSITION SENSOR PLATE (TEETH OF SENSOR PLATE) Check the teeth of the No. 1 crankshaft position sensor plate. Refer to «COMPONENTS»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-phv) . OK Sensor plate does not have any cracks or deformation. NG --> See step 11 OK: Go to next step
6. REPLACE CRANKSHAFT POSITION SENSOR Replace the crankshaft position sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-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. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0335 is output B HINT: If the engine does not start, replace the ECM. B --> See step 12 A --> END
8. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__check-for-intermittent-problems)
9. REPLACE CRANKSHAFT POSITION SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
10. SECURELY REINSTALL SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
11. REPLACE NO. 1 CRANKSHAFT POSITION SENSOR PLATE. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-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 camshaft position sensor for intake camshaft (G2 signal sensor) consists of a magnet and MR element.

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

HINT

DTC P0340 indicates a malfunction relating to the camshaft position sensor circuit (the wire harness between the ECM and camshaft position sensor, and the camshaft position sensor itself).

Reference: Inspection using an oscilloscope. Refer to DESCRIPTION .

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

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

ALL

P0340: CAMSHAFT POSITION SENSOR VERIFY PULSE INPUT

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

P0340: CAMSHAFT POSITION SENSOR VERIFY PULSE INPUT

P0342: CAMSHAFT POSITION SENSOR RANGE CHECK (LOW VOLTAGE)

P0343: CAMSHAFT POSITION SENSOR RANGE CHECK (HIGH VOLTAGE)

Scheme 541

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 seconds or more [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: P0340, P0342 or P0343.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0335. Refer to WIRING DIAGRAM .

HINT

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

Scheme 542

Scheme 543

Scheme 544

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0340, P0342 AND P0343) 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 P0340, P0342 or P0343 is output A DTC P0340, P0342 or P0343 and other DTCs are output B HINT: If any DTCs other than P0340, P0342 and P0343 are output, troubleshoot those DTCs first. B --> See step 11 A: Go to next step
2. INSPECT CAMSHAFT POSITION SENSOR (POWER SOURCE) Disconnect the camshaft position sensor connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D18-3 (VC) - Body ground Power switch on (IG) 4.5 to 5.0 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Camshaft Position Sensor) Reconnect the camshaft position sensor connector. NG --> See step 10 OK: Go to next step
3. 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 (Check for Open) Tester Connection Condition Specified Condition D18-1 (VVI+) - D28-76 (G2+) Always Below 1 ohms D18-2 (VVI-) - D28-122 (G2-) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D18-1 (VVI+) or D28-76 (G2+) - Body ground Always 10 kohms or higher D18-2 (VVI-) or D28-122 (G2-) - Body ground Always 10 kohms or higher 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
4. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR) Check the camshaft position sensor installation. OK Sensor is installed correctly. NG --> See step 12 OK: Go to next step
5. INSPECT INTAKE CAMSHAFT (TIMING ROTOR) Check the timing rotor of the intake camshaft. OK Camshaft timing rotor does not have any cracks or deformation. NG --> See step 13 OK: Go to next step
6. 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
7. CHECK WHETHER DTC OUTPUT RECURS (P0340, P0342 OR P0343) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-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) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0340, P0342 or P0343 is output A DTC is not output B HINT: If the engine does not start, replace the ECM. B --> END A: Go to next step
8. ADJUST VALVE TIMING HINT: There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to match-up the alignment marks. Refer to «DISASSEMBLY»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-phv) . TEXT IN ILLUSTRATION *1 Top *2 Alignment Mark *3 No. 1 Cylinder at TDC Compression NEXT: Go to next step
9. CHECK WHETHER DTC OUTPUT RECURS (P0340, P0342 OR P0343) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-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) . Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0340, P0342 or P0343 is output B HINT: If the engine does not start, replace the ECM. B --> See step 14 A --> END
10. 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 (Check for Open) Tester Connection Condition Specified Condition D18-3 (VC) - D28-99 (VCV1) Always Below 1 ohms Standard Resistance (Check for Short) 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 --> See step 14
11. 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)
12. SECURELY REINSTALL SENSOR. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
13. REPLACE INTAKE CAMSHAFT. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#engine-mechanical-service-information-phv)
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. These DTCs indicate malfunctions relating to the primary circuit.
2. If DTC P0351 is set, check the No. 1 ignition coil assembly circuit.
3. If DTC P0352 is set, check the No. 2 ignition coil assembly circuit.
4. If DTC P0353 is set, check the No. 3 ignition coil assembly circuit.
5. If DTC P0354 is set, check the No. 4 ignition coil assembly circuit.

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

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

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

Scheme 545

Scheme 546

1. Reference: Inspection using an oscilloscope.
2. While cranking or idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF1 and E1 of the ECM connector. ECM Terminal Name Between IGT (1 to 4) and E1 Between IGF1 and E1 Tester Range 2 V/DIV., 20 ms./DIV. Condition Idling

Scheme 547

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

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

Scheme 548

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 seconds or more [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: P0351, P0352, P0353 or P0354.
14. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
17. If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-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 549

Scheme 550

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 551

1. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND) Disconnect the ignition coil assembly connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D23-4 (GND) - Body ground Always Below 1 ohms D22-4 (GND) - Body ground Always Below 1 ohms D21-4 (GND) - Body ground Always Below 1 ohms D20-4 (GND) - Body ground Always Below 1 ohms Reconnect the ignition coil assembly connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - BODY GROUND) OK: Go to next step
2. INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE) Disconnect the ignition coil assembly connectors. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition D23-1 (+B) - D23-4 (GND) Power switch on (IG) 11 to 14 V D22-1 (+B) - D22-4 (GND) Power switch on (IG) 11 to 14 V D21-1 (+B) - D21-4 (GND) Power switch on (IG) 11 to 14 V D20-1 (+B) - D20-4 (GND) Power switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Ignition Coil Assembly) Reconnect the ignition coil assembly connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - IG2 RELAY) OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM) Disconnect the ignition coil assembly connectors. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D23-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D22-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D21-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms D20-2 (IGF) - D28-23 (IGF1) Always Below 1 ohms Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D23-3 (IGT1) - D28-108 (IGT1) Always Below 1 ohms D22-3 (IGT2) - D28-107 (IGT2) Always Below 1 ohms D21-3 (IGT3) - D28-106 (IGT3) Always Below 1 ohms D20-3 (IGT4) - D28-105 (IGT4) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D23-2 (IGF) or D28-23 (IGF1) - Body ground Always 10 kohms or higher D22-2 (IGF) or D28-23 (IGF1 - Body ground Always 10 kohms or higher D21-2 (IGF) or D28-23 (IGF1) - Body ground Always 10 kohms or higher D20-2 (IGF) or D28-23 (IGF1) - Body ground Always 10 kohms or higher Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D23-3 (IGT1) or D28-108 (IGT1) - Body ground Always 10 kohms or higher D22-3 (IGT2) or D28-107 (IGT2) - Body ground Always 10 kohms or higher D21-3 (IGT3) or D28-106 (IGT3) - Body ground Always 10 kohms or higher D20-3 (IGT4) or D28-105 (IGT4) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the ignition coil assembly connectors. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL ASSEMBLY - ECM) OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . Shuffle arrangement of the ignition coil assemblies (among No. 1 to No. 4 cylinders). NOTE: Do not shuffle the connectors. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to Same DTC output A Different ignition coil DTC output B B --> See step 5 A --> See step 6
5. REPLACE IGNITION COIL ASSEMBLY. Refer to «REMOVAL»(/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)

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

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

Scheme 552

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 reaches 70°C (158°F) or more [B]. HINT: The A/C switch and all accessory switches should be off and shift lever in P or N.
8. Drive the vehicle at 25 to 37 mph (40 to 60 km/h) for 5 minutes or more [C].
9. Idle the engine for 30 seconds or more [D].
10. Accelerate the vehicle to 25 to 37 mph (40 to 60 km/h) with the shift lever in B [E].
11. Perform fuel cut operation for 5 seconds or more, with the accelerator pedal fully released [F]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: When fuel cut is operating "Idle Fuel Cut" in Data List is ON.
12. Enter the following menus: Powertrain / Engine and ECT / Monitor / Exhaust Gas Recirculation/VVT / Status2 [G].
13. Check that the Exhaust Gas Recirculation/VVT / Status2 monitor is Complete. HINT: If the monitor is Incomplete, perform the driving pattern again.
14. Enter the following menus: Powertrain / Engine and ECT / Monitor / Exhaust Gas Recirculation/VVT/Details.
15. Check the Details (EGR FLOW INSUFFICIENCY). HINT: Make sure that the value is between MIN and MAX.
16. If the monitor is still Incomplete, perform the following procedure.
17. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
18. Read Pending DTCs.
19. If a pending DTC is output, the system is malfunctioning, HINT: If a pending DTC is not output, perform the following procedure.
20. Enter the following menus: Power train / Engine and ECT / Utility / All Readiness.
21. Input the DTC: P0401.
22. 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 judgement result shows NORMAL, the system is normal. If the DTC judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, accelerate the vehicle again at 25 to 37 mph (40 to 60 km/h) with the shift lever in B, perform fuel cut operation for 5 seconds or more with the accelerator pedal fully released, and check the DTC judgment result.
23. 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. By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
2. When the engine is idling steadily with the EGR valve fully closed, if the EGR valve is normal and it is opened using the Active Test, the Data List value changes as follows. Data List Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test Engine Speed Idle becomes rough MAP Pressure rises
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 553

Scheme 554

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P0401) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTC. Result Result Proceed to DTC P0401 is output A DTC P0401 and other DTCs are output B HINT: If any DTCs other than P0401 are output, troubleshoot those DTCs first. B --> See step 12 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. 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 and shift lever in P or N. 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 as follows. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) - MAP value is 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 Within standard range A Outside of standard range B B --> See step 4 A: Go to next step
3. INSPECT EGR VALVE ASSEMBLY Check if the EGR valve are clogged with deposits. Check if the EGR valve is closed. OK EGR valve is closed and no deposits. Result Result Proceed to NG A OK B B --> See step 5 A: Go to next step
4. REPLACE EGR VALVE ASSEMBLY Replace the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT: Go to next step
5. CHECK FOR DEPOSIT (INTAKE PORT TO EGR VALVE ASSEMBLY) Check for exhaust leaks at each connection point. Check for cracks, damage, and clogs in the pipes between the intake manifold and the EGR valve assembly. This check may require the removal of components. Check if there is a built-up of deposits in the EGR valve of pipes. OK No deposits. NG --> REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step
6. CHECK FOR DEPOSIT (EXHAUST MANIFOLD SUB-ASSEMBLY TO EGR VALVE ASSEMBLY) Check for exhaust leaks at each connection point. Check for cracks, damage, and clogs in the pipes between the exhaust manifold sub-assembly and the EGR valve assembly. This check may require the removal of components. Check if there is a built-up of deposits in the EGR valve of pipes. OK No deposits. NG --> REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step
7. INSPECT EGR WITH COOLER PIPE SUB-ASSEMBLY Check for blockage of the EGR with cooler pipe sub-assembly. OK No blockage for the EGR with cooler pipe sub-assembly. NG --> REPAIR OR REPLACE EGR WITH COOLER PIPE SUB-ASSEMBLY OK: Go to next step
8. READ VALUE USING TECHSTREAM (MANIFOLD ABSOLUTE PRESSURE SENSOR) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP. Read the MAP value. Standard Switch Condition Techstream Display Power switch on (IG) 80 to 110 kPa (600 to 825 mmHg) 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. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP. Read the MAP value when idling the engine with the A/C switch and all accessory switches should be off and shift lever in P or N. Standard Engine Condition Techstream Display Idling Less than 80 kPa (600 mmHg) Result Result Proceed to NG A OK B B --> See step 11 A: Go to next step
9. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-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
10. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Replace the manifold absolute pressure sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT: Go to next step
11. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Clear the 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 until the engine coolant temperature reaches 70°C (158°F) or more. HINT: The A/C switch and all accessory switches should be off and shift lever in P or N. Drive the vehicle at 25 to 37 mph (40 to 60 km/h) with the shift lever in B. WARNING: Strictly observe speed limits and traffic laws when performing the confirmation drive pattern. Perform fuel cut operation for 5 seconds or more with the accelerator pedal fully released. HINT: If the deceleration was not completed, perform the Confirmation Driving Pattern again. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read Pending DTC. If the pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0401. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If a pending DTC is not output and the DTC judgment result is INCOMPLETE or UNKNOWN, drive the vehicle again at 25 to 37 mph (40 to 60 km/h) with the shift lever in B, perform fuel cut operation for 5 seconds or more with the accelerator pedal fully released, and check the DTC judgment result. NEXT --> END
12. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__diagnostic-trouble-code-chart)

Refer to DTC P0401. Refer to DESCRIPTION .

HINT

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

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

Example

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

Scheme 555

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 [B].
8. Drive the vehicle at 12 mph (20 km/h) or more for 10 minutes [C].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
10. Read the DTCs [D].
11. If the DTC P0403 is output, the system is malfunction. 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: P0403.
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's memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system has a normal.
15. If the test result is INCOMPLETE or UNKNOWN, drive the vehicle at 12 mph (20 km/h) or more for 10 minutes, and check the DTC judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system has a 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.

Scheme 556

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 557

Scheme 558

1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. 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 Within standard range A Outside of standard range B B --> See step 2 A --> See step 6
2. INSPECT EGR VALVE ASSEMBLY Disconnect the EGR valve assembly connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2 (+B1) - 3 (EGR2) 20 °C (68 °F) 18 to 22 ohms 2 (+B1) - 1 (EGR4) 5 (+B2) - 4 (EGR1) 5 (+B2) - 6 (EGR3) TEXT IN ILLUSTRATION *a Component without harness connected (EGR Valve Assembly) Reconnect the EGR valve assembly connector. NG --> See step 7 OK: Go to next step
3. INSPECT EGR VALVE ASSEMBLY (+B1 OR +B2 VOLTAGE) Disconnect the EGR valve assembly connector. Turn the power switch on (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition D10-2 (+B1) - Body ground Power switch on (IG) 11 to 14 V D10-5 (+B2) - Body ground TEXT IN ILLUSTRATION *a Front view of wire harness connector (to EGR Valve Assembly) Reconnect the EGR valve assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EGR VALVE ASSEMBLY - EFI MAIN RELAY) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (ECM - EGR VALVE ASSEMBLY) Disconnect the EGR valve assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition D28-45 (EGR1) - D10-4 (EGR1) Always Below 1 ohms D28-44 (EGR2) - D10-3 (EGR2) D28-43 (EGR3) - D10-6 (EGR3) D28-42 (EGR4) - D10-1 (EGR4) Standard Resistance (Check for Short) Tester Connection Condition Specified Condition D28-45 (EGR1) or D10-4 (EGR1) - Body ground Always 10 kohms or higher D28-44 (EGR2) or D10-3 (EGR2) - Body ground D28-43 (EGR3) or D10-6 (EGR3) - Body ground D28-42 (EGR4) or D10-1 (EGR4) - Body ground Reconnect the ECM connector. Reconnect the EGR valve assembly connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - EGR VALVE ASSEMBLY) OK: Go to next step
5. CHECK DTC OUTPUT RECORDS (DTC P0403) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-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 warm it up. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0403 is output B B --> See step 8 A --> END
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__check-for-intermittent-problems)
7. 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)
8. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

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

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

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

The oxygen storage capacity value is an indication of the oxygen storage capacity of the three-way catalytic converter. When the vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 15 to 20 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If the cycle of the waveform for the heated oxygen sensor is long, the oxygen storage capacity is great. There is a direct correlation between the heated oxygen sensor and the oxygen storage capacity of the three-way catalytic converter.

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

HINT

1. Sensor 1 refers to the sensor closest to the engine assembly.
2. Sensor 2 refers to the sensor farthest away from the engine assembly.

Scheme 559

TEXT IN ILLUSTRATION

MONITOR RESULT

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

CONFIRMATION DRIVING PATTERN

HINT

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

Scheme 560

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.
6. Turn the power switch on (IG) and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Monitor.
8. Check that Catalyst Efficiency / Status2 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 between 47 and 75 mph (75 and 120 km/h) for at least 10 minutes or more [B].
12. Those items will change to Complete after completing the driving pattern.
13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
14. Check if any DTCs (pending DTCs) are set.

HINT

If Catalyst does not change to Complete, and no pending DTCs are stored, extend the driving time.

CONDITIONING FOR SENSOR TESTING

HINT

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

Scheme 561

1. (a) Connect the Techstream to the DLC3 [A].
2. (b) Turn the power switch on (IG) and turn the Techstream on [B].
3. (c) Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) [C].
4. (d) Start the engine and warm it up with all the accessories switched off until the engine coolant temperature stabilizes [D].
5. (e) Run the engine at an engine speed of between 2500 rpm for at least 3 minutes [E].
6. (f) While running the engine at 2500 rpm for 2 seconds and 1500 rpm for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream [F].

HINT

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

Scheme 562

Scheme 563

Scheme 564

Scheme 565

1. AIR FUEL RATIO CONTROL 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. Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) +25% Rich Less than 3.1 V AFS Voltage B1S1 (Air fuel ratio) -12.5% Lean More than 3.4 V O2S B1S2 (Heated oxygen) +25% Rich More than 0.55 V O2S B1S2 (Heated oxygen) -12.5% Lean Less than 0.4 V NOTE: The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. Case Air Fuel Ratio Sensor (Sensor 1) Output Voltage Heated Oxygen Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area 1 - 2 Air fuel ratio sensor Air fuel ratio sensor heater Air fuel ratio sensor circuit 3 Heated oxygen sensor Heated oxygen sensor heater Heated oxygen sensor circuit Exhaust gas leaks 4 Fuel pressure Exhaust gas leaks (Air fuel ratio extremely lean or rich) Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2. 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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0420 is output A DTC P0420 and other DTCs are output B HINT: If any DTCs other than P0420 are output, troubleshoot those DTCs first. B --> See step 6 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (AIR FUEL RATIO CONTROL) Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine and warm it up. Run the engine at an engine speed of 2500 rpm for approximately 90 seconds. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F sensor. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the voltage outputs of the air fuel ratio sensor and heated oxygen sensor (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream. HINT: The Control the Injection Volume for A/F sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Standard Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) +25% Rich Less than 3.1 V -12.5% Lean More than 3.4 V O2S B1S2 (Heated oxygen) +25% Rich More than 0.55 V -12.5% Lean Less than 0.4 V Result Status AFS Voltage B1S1 Status O2S B1S2 Air Fuel Ratio Condition and Air Fuel Ratio and Heated Oxygen Sensors Condition Misfire Main Suspected Trouble Area Proceed to Lean/Rich Lean/Rich Normal - Three-way catalytic converter Gas leaks from exhaust system EGR valve assembly A Lean Lean/Rich Air fuel ratio sensor malfunction - Air fuel ratio sensor B Rich Lean/Rich Air fuel ratio sensor malfunction - Air fuel ratio sensor Lean/Rich Lean Heated oxygen sensor malfunction - Heated oxygen sensor Gas leaks from exhaust system C Lean/Rich Rich Heated oxygen sensor malfunction - Heated oxygen sensor Gas leaks from exhaust system Lean Lean Actual air fuel ratio lean May occur Extremely rich or lean actual air fuel ratio Gas leaks from exhaust system EGR valve assembly D Rich Rich Actual air fuel ratio rich - Extremely rich or lean actual air fuel ratio Gas leaks from exhaust system EGR valve assembly Lean: During Control the Injection Volume for A/F sensor, the air fuel ratio sensor output voltage (AFS Voltage) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V. Rich: During the AFS Voltage is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V. Lean/Rich: During Control the Injection Volume for A/F sensor of the Active Test, the output voltage of the heated oxygen sensor alternates correctly. 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. D --> See step 11 C --> See step 9 B --> See step 7 A: Go to next step
3. INSPECT FOR EXHAUST GAS LEAK Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-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 8 A: Go to next step
5. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-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 15 OK --> See step 8
6. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__diagnostic-trouble-code-chart)
7. REPLACE AIR FUEL RATIO SENSOR (SENSOR 1). Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
8. REPLACE FRONT EXHAUST PIPE ASSEMBLY (TWC: FRONT AND REAR CATALYST). Refer to «COMPONENTS»(/toyota/prius-phv/pre-iii-2010-2011/remont/mechanical/#intake-manifold-service-information-phv)
9. INSPECT FOR EXHAUST GAS LEAK Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK --> See step 10
10. REPLACE HEATED OXYGEN SENSOR (SENSOR 2). Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
11. INSPECT FOR EXHAUST GAS LEAK Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes. OK No gas leaks. NG --> REPAIR OR REPLACE EXHAUST GAS LEAK POINT OK: Go to next step
12. 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 14 A: Go to next step
13. 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 15 OK --> See step 14
14. CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO. Refer to «INSPECTION PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv)
15. 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)

DTC SUMMARY

HINT

The reference orifice is located inside 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 .

In sequence B and E, the leak detection pump creates negative pressure (vacuum) through the reference orifice. The EVAP system pressure is then measured by the ECM, using the canister pressure sensor, to determine the reference pressure. If the pressure is one of the following conditions, the ECM illuminates the MIL and sets the DTC (2 trip detection logic).

Scheme 566

1. Canister pressure is lower than the malfunction criterion (example 96.4 kPa (723.19 mmHg)).
2. Canister pressure is higher than the malfunction criterion (example 100 kPa) (751.6 mmHg)).
3. Canister pressure is not saturated within 60 seconds.
4. Canister pressure difference between sequence B and E is large.

Scheme 567

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

Scheme 568

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: P043E, P043F, P2401, P2402 or P2419.
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.

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

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

The two monitors, Key-off and Purge Flow, are used to detect malfunctions relating to DTC P0441. The key-off monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours* after the power switch is turned off. The purge flow monitor runs while the engine is running.

HINT

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

Scheme 569

Scheme 570

Scheme 571

1. KEY-OFF MONITOR Purge VSV stuck open In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system. The EVAP system pressure is then measured by the ECM using the canister pressure sensor. If the stabilized system pressure is higher than [second reference pressure x 0.2], the ECM interprets this as the purge VSV (Vacuum Switching Valve) being stuck open. The ECM illuminates the MIL and sets the DTC (2 trip detection logic). Purge VSV stuck closed During sequence D, the canister pressure sensor measures the EVAP system pressure. The pressure measurement for purge VSV monitor is begun when the purge VSV is turned on (open) after the EVAP leak check. When the measured pressure indicates an increase of 0.3 kPa (2.25 mmHg) or more, the purge VSV is functioning normally. If the pressure does not increase, the ECM interprets this as the purge VSV being stuck closed. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).
2. PURGE FLOW MONITOR The purge flow monitor consists of the two step monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.

1. The 1st monitor While the engine is running and the purge VSV (Vacuum Switching Valve) is on (open), the ECM monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd monitor.
2. The 2nd monitor The vent valve is turned on (closed) and the EVAP pressure is then measured. If the variation in the pressure is less than 0.5 kPa (3.75 mmHg), the ECM interprets this as the Purge VSV being stuck closed. The ECM illuminates the MIL and sets DTC P0441 (2 trip detection logic).

Atmospheric pressure check

In order to ensure reliable malfunction detection, the variation between the atmospheric pressure, before and after conduction of the purge flow monitor is measured by the ECM.

PURGE FLOW MONITOR

KEY-OFF MONITOR

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

PURGE VSV STUCK OPEN

PURGE VSV STUCK CLOSED

PURGE FLOW

Scheme 572

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 15 minutes or more [B].
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes/ Pending.
9. Read the pending DTC [C].
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: P0441.
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 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).
14. Turn the power switch on (IG) and turn the Techstream on.
15. Clear the DTCs (even if no DTCs are stored, perform the clear the DTC operation). Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) .
16. Turn the power switch off and wait for 30 seconds.
17. Turn the power switch on (IG) and turn the Techstream on.
18. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode [D].
19. After the Evaporative System is completed, check for DTC by entering the following menus: Powertrain / Engine and ECT / Trouble Codes / pending.
20. Read the pending DTC [E].
21. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
22. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
23. Input the DTC: P0441.
24. 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 [B] and [D].
25. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
26. 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.
27. 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 Checking Monitor Status. Refer to CHECKING MONITOR STATUS .

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 P0441) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTC. Result Result Proceed to DTC P0441 is output A DTC P0441 and other DTCs are output B B --> See step 4 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. 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 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 as follows. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling or engine stall MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in EGR valve. Result Result Proceed to Outside standard range A Within standard range B B --> See step 6 A: Go to next step
3. 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 5 OK --> See step 6
4. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__diagnostic-trouble-code-chart)
5. 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)
6. GO TO EVAP SYSTEM. Refer to «EVAP System»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p2102-u0293-circuit-tests-phv)

HINT

The canister pressure sensor is built into the canister pump module.

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

Scheme 573

HINT

Standard atmospheric pressure is 101.3 kPa (759.75 mmHg)

1. DTC P0451: Canister pressure sensor voltage constant or abnormal fluctuation If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the canister pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (2 trip detection logic).
2. DTC P0452: Canister pressure sensor voltage low If the canister pressure sensor voltage output (pressure) is below 0.45 V (42.11 kPa (316 mmHg)), the ECM interprets this as an open or short circuit in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
3. DTC P0453: Canister pressure sensor voltage high If the canister pressure sensor voltage output (pressure) is 4.9 V (123.761 kPa (928.5 mmHg) or more, the ECM interprets this as an open or short circuit in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).

ALL

P0451: NOISE MONITOR

P0452 AND P0453

P0451: NOISE MONITOR

P0452: CANISTER PRESSURE SENSOR LOW VOLTAGE

P0453: CANISTER PRESSURE SENSOR HIGH VOLTAGE

Scheme 574

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. Enter the following menus: Powertrain / Engine and ECT / Data List / Intake Air.
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 / Utility / Evaporative System Check / Automatic Mode [A].
8. After the Evaporative System Check is completed, check for DTCs by entering 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: P0451, P0452 or P0453.
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, perform steps [A] again.
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 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 575

Scheme 576

Note. When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel cap. Do not disassemble the canister pump module. The Techstream is required to conduct the following diagnostic troubleshooting procedure.

Scheme 577

Scheme 578

Scheme 579

1. CONFIRM DTC AND EVAP PRESSURE Connect the Techstream to the DLC3. Turn the power switch on (IG) (do not start the engine). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Pump. Read the EVAP (evaporative emission) pressure displayed on the Techstream. Result Display (DTC Output) Result Suspected Trouble Area Proceed to P0451 - Canister pressure sensor C P0452 Less than 45 kPa (337 mmHg) Wire harness/connector (ECM - canister pressure sensor) Canister pressure sensor Short in ECM circuit A P0453 More than 120 kPa (901 mmHg) Wire harness/connector (ECM - canister pressure sensor) Canister pressure sensor Open in ECM circuit B C --> See step 4 B --> See step 5 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Turn the power switch off. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to D28-114 (PPMP) - Body ground Always Below 10 ohms Wire harness/connector (ECM - canister pressure sensor) Short in canister pressure sensor circuit A 10 kohms or higher Wire harness/connector (ECM - canister pressure sensor) Short in ECM circuit B Reconnect the ECM connector. B --> See step 9 A: Go to next step
3. 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. Result Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to D28-114 (PPMP) - Body ground Always 10 kohms or higher Short in canister pressure sensor circuit A Below 10 ohms Short in wire harness/connector (ECM - canister pressure sensor) B Reconnect the No. 3 frame wire to the floor wire side connector. Reconnect the ECM connector. B --> See step 8 A --> See step 6
4. GO TO EVAP SYSTEM. Refer to «EVAP System»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p2102-u0293-circuit-tests-phv)
5. CHECK HARNESS AND CONNECTOR (NO. 3 FRAME WIRE - ECM) Disconnect the No. 3 frame wire from the floor wire side connector. Turn the power switch on (IG). Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition R45-6 (VCC) - Body ground Power switch on (IG) 4.5 to 5.5 V R45-7 (VOUT) - Body ground Power switch on (IG) 4.5 to 5.5 V Standard Resistance (Check for Open) Tester Connection Condition Specified Condition R45-8 (SGND) - Body ground Always Below 100 ohms TEXT IN ILLUSTRATION *a Front view of wire harness connector (to No. 3 Frame Wire) Result Result Suspected Trouble Area Proceed to Voltage and resistance within standard ranges Open in canister pressure sensor circuit A Voltage and resistance outside standard ranges Open in wire harness/connector (ECM - canister pressure sensor) B Reconnect the No. 3 frame wire to the floor wire side connector. B --> See step 8 A: Go to next step
6. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Disconnect the No. 3 frame wire from the canister pump module and 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 No. 3 frame wire canister pump module side terminal 6 - R45-6 (VCC) Always Below 1 ohms No. 3 frame wire canister pump module side terminal 7 - R45-7 (VOUT) Always Below 1 ohms No. 3 frame wire canister pump module side terminal 8 - R45-8 (SGND) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition No. 3 frame wire canister pump module side terminal 6 or R45-6 (VCC) - Body ground Always 10 kohms or higher No. 3 frame wire canister pump module side terminal 7 or R45-7 (VOUT) - 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 connector. NG --> See step 10 OK: Go to next step
7. 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) . NOTE: When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. TEXT IN ILLUSTRATION *1 Fuel Tank Vent Hose *2 Vent Hose *3 Air Inlet Port *4 Inspection Area (Check for Disconnection and/or Cracks) *5 Canister *6 Fuel Tank NEXT --> See step 11
8. REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 FRAME WIRE - ECM) Repair or replace harness or connector. NEXT --> See step 11
9. 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 --> See step 11
10. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - FLOOR WIRE) Repair or replace harness or connector. NEXT: Go to next step
11. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR) 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: P0451, P0452 or P0453. Check the DTC judgment result. HINT: If DTC judgment result is NORMAL, the repair has been successfully completed. NEXT --> END

The idle speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) the one valve type throttle body; 2) a throttle actuator, which operates the throttle valve; 3) a throttle position sensor, which detects the opening angle of the throttle valve; 4) an accelerator pedal position sensor, which detects the accelerator pedal position; and 5) the ECM, which controls the electronic throttle control system. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

The ECM monitors the idle speed and idle air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the idle speed control system is malfunctioning if the following conditions apply

1. The learned idle air flow volume remains at the maximum or minimum volume for 5 seconds or more during a drive cycle.
2. After driving at a vehicle speed of 34.175 mph (55 km/h) or more, the actual engine idle speed varies from the target idle speed by less than -100 rpm or 200 rpm or more, 5 times or more during a driving cycle, the ECM illuminates the MIL and sets the DTC.

Scheme 580

Scheme 581

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
4. Make sure that the coolant temperature is 60°C (140°F) or less [A]. HINT: If the coolant temperature is 60°C (140°F) or more, the engine may stop when idling. Make sure to keep the coolant temperature at 60°C (140°F) or less during the driving pattern.
5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure). Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) .
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 drive the vehicle until the coolant temperature reaches 70°C (158°F) [B].
8. Stop the vehicle (0 mph (0 km/h)) [C].
9. Accelerate the vehicle to 34 to 37 mph (55 to 60 km/h) or more, and then idle the engine [D]. HINT: If the vehicle speed reaches more than 37 mph (60 km/h), the engine may stop while decelerating.
10. Stop the vehicle (0 mph (0 km/h)) [E].
11. Repeat steps [D] and [E] for 5 times or more.
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
13. Read the pending DTC [F].
14. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Input the DTC: P0505.
17. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, repeat steps [D] and [E] for 5 times or more.
18. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
19. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
20. If the test result is INCOMPLETE or UNKNOWN, 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 a permanent DTC is not output, the system is normal.

HINT

1. The following conditions may also cause DTC P0505 to be set: The floor carpet overlapping slightly onto the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open. The accelerator pedal being not fully released.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) 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 P0505 is output A DTC P0505 and other DTCs are output B HINT: If any DTCs other than P0505 are output, troubleshoot those DTCs first. B --> See step 9 A: Go to next step
2. CHECK PCV HOSE CONNECTIONS Check the PCV hose connections. OK PCV hose is connected correctly and is not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
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 from the intake system. NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
4. INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE) Check for contamination between the throttle valve and the housing and then check that the throttle valve moves smoothly. OK Throttle valve is not contaminated with foreign objects and moves smoothly. NG --> See step 10 OK: Go to next step
5. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-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 7 A: Go to next step
6. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-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 11 OK: Go to next step
7. 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
8. 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: P0505. Check the DTC judgment result. NEXT --> END
9. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__diagnostic-trouble-code-chart)
10. REPLACE THROTTLE BODY ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
11. 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)

This monitor will run when the engine is started at an engine coolant temperature of -10 to 50°C (14 to 122°F). The DTC can be set after the engine idles for 13 seconds (2 trip detection logic).

The DTC is designed to monitor the idle air control at cold start. When the engine is started at an engine coolant temperature of lower than 50°C (122°F), the ECM measures the accumulated mass air flow at idle. If it does not reach the specified level within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

The electronic throttle control system controls the idle speed. The electronic throttle control system operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.

Note. When the negative battery terminal is disconnected during inspection or repairs, the idle speed control (ISC) learned values are cleared. Idle speed control learning needs to be performed before this DTC can be stored. To perform idle speed control learning, the engine must be warmed up by allowing it to idle for 5 minutes. For idle speed control learning to be successful, when the engine is started to warm it up, there must be at least 10 seconds of idling with the coolant temperature below 50°C (122°F) before allowing it to continue running for the 5 minute learning period.

HINT

The idle speed control learning is performed when the engine is warmed up and has been idling for 5 minutes.

Scheme 582

Scheme 583

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. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
7. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).
8. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) .
9. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.
10. Idle the engine for 1 minute or more [B].
11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
12. Read the pending DTC [C].
13. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P050A.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions 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, let the engine cool down, and then perform steps [A] through [B].
17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
18. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
19. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-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

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 P050A) 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 P050A is output A DTC P050A and other DTCs are output B HINT: If any DTCs other than P050A are output, troubleshoot those DTCs first. B --> See step 22 A: Go to next step
2. READ VALUE USING TECHSTREAM (FUEL TRIM) HINT: Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter sub-assembly. 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 / Short FT #1 and Long FT #1. Read the values displayed on the Techstream. Add together the Short FT #1 and Long FT #1 values to obtain the total Fuel Trim. OK Total of Short FT #1 and Long FT #1 values is between -20% and 20%. NG --> See step 9 OK: Go to next step
3. INSPECT THROTTLE BODY ASSEMBLY Check that there are no deposits around the throttle valve. OK No deposits around the throttle valve. NG --> See step 7 OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR VALVE 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 6 A: Go to next step
5. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-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 19 OK: Go to next step
6. 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 --> See step 8
7. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY Repair or replace the throttle body assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> See step 8
8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data). 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. 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: P050A. Check the DTC judgment result. NEXT --> END
9. CHECK PCV HOSE Check the PCV hose connections. OK PCV hose is connected correctly and is not damaged. NG --> See step 16 OK: Go to next step
10. 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 --> See step 17 OK: Go to next step
11. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil. OK The air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil. NG --> See step 18 OK: Go to next step
12. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR VALVE 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 14 A: Go to next step
13. 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 19 OK: Go to next step
14. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) HINT: If the result is not acceptable, cool the engine and perform the Active Test again. Start the engine when the engine coolant temperature is 30°C (86°F) or less. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream with the engine coolant temperature at 50°C (122°F) or less. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) NG --> See step 20 OK: Go to next step
15. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Replace the mass air flow meter sub-assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> See step 21
16. REPAIR OR REPLACE PCV HOSE Repair or replace the PCV hose. NEXT --> See step 21
17. REPAIR OR REPLACE INTAKE SYSTEM Repair or replace the intake system. NEXT --> See step 21
18. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Replace the air cleaner filter element sub-assembly. NEXT --> See step 21
19. REPLACE EGR VALVE ASSEMBLY Replace 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) . NEXT --> See step 21
20. CHECK AND REPAIR VVT SYSTEM HINT: Check the VVT system. NEXT: Go to next step
21. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (DTC P050A) NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data). Connect 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. 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: P050A. Check the DTC judgment result. NEXT --> END
22. 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)

This monitor will run when the engine is started at -10 to 50°C (14 to 122°F) of the engine coolant temperature. The DTC can be set after the engine idles for 13 seconds or more (2 trip detection logic).

The DTC is designed to monitor the idle air control at cold start. When the engine is started at lower than 50°C (122°F) of the engine coolant temperature, the ECM measures the accumulated mass air flow at idle. If it does not reach the criteria within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is set when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

The electronic throttle control system controls the idle speed. The electrical throttle control system operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.

Note. When the negative (-) battery terminal is disconnected during inspection or repairs, the idle speed control learned values are cleared. Idle speed control learning is performed when the engine has been warmed up and idled for 5 minutes because this DTC cannot be set after the idle speed control learned values are cleared.

Scheme 584

Scheme 585

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. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
7. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).
8. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) .
9. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.
10. Idle the engine for 1 minute or more [B].
11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
12. Read the pending DTC [C].
13. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P050B.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions 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, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] through [B].
17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
18. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
19. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-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 P050B may be set when the engine shows the symptom as listed below. If necessary, check the trouble area as listed below. Symptom Factor Trouble Area Low idle speed at engine cold. Excessive engine friction Engine oil deterioration Rough idle at engine cold. Abnormal combustion Fuel quality
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. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following the menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P050B is output A DTC P050B and other DTCs are output B HINT: If any DTCs other than P050B are output, troubleshoot those DTCs first. B --> See step 22 A: Go to next step
2. READ VALUE USING TECHSTREAM (FUEL TRIM) HINT: Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter sub-assembly. Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Active Test / Short FT #1 and Long FT #1. Read the values displayed on the Techstream at engine idle. Add together the Short FT #1 and Long FT #1 values to obtain the total fuel trim. OK Total of Short FT #1 and Long FT #1 values is between -20 % and 20 %. NG --> See step 9 OK: Go to next step
3. CHECK THROTTLE BODY ASSEMBLY Check for deposits around the throttle valve and throttle valve condition. OK No deposits around throttle valve and throttle valve moves smoothly. NG --> See step 7 OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or more. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position. Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test. HINT: Do not leave the EGR valve open for 10 seconds or more during the Active Test. Be sure to return the EGR valve to step 0 when the Active Test is completed. Do not open the EGR valve 30 steps or more during the Active Test. OK MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List. Standard - EGR Step Position (Active Test) 0 Steps 0 to 30 Steps Idling condition Steady idling Idling changes from steady to rough idling MAP (Data List) MAP value is 20 to 40 kPa (150 to 300 mmHg) (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. Result Result Proceed to Outside of standard range A Within standard range B B --> See step 6 A: Go to next step
5. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-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 19 OK: Go to next step
6. 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 --> See step 8
7. REPAIR OR REPLACE THROTTLE BODY ASSEMBLY Repair or replace the throttle body assembly. 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
8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (DTC P050B) NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data). Connect 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. 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: P050B. Check the DTC judgment result. NEXT --> END
9. CHECK PCV HOSE (HOSE CONNECTIONS) Check the PCV hose connections. OK PCV hose is connected correctly and is not damaged. NG --> See step 16 OK: Go to next step
10. 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 --> See step 17 OK: Go to next step
11. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil. OK Air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil. NG --> See step 18 OK: Go to next step
12. 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 14 A: Go to next step
13. 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 19 OK: Go to next step
14. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) HINT: If the result is not acceptable, cool the engine and perform the Active Test again. Start the engine when the engine coolant temperature is 30°C (86°F) or less. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1). Check the engine speed while operating the camshaft timing oil control valve assembly using the Techstream with the engine coolant temperature at 50°C (122°F) or less. Result Techstream Operation Specified Condition OFF Normal engine speed ON Engine idles roughly or stalls (soon after camshaft timing oil control valve assembly switched from OFF to ON) NG --> See step 20 OK: Go to next step
15. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Replace the mass air flow meter sub-assembly. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv) . NEXT --> See step 21
16. REPAIR OR REPLACE PCV HOSE Repair or replace the PCV hose. NEXT --> See step 21
17. REPAIR OR REPLACE INTAKE SYSTEM Repair or replace the intake system. NEXT --> See step 21
18. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Replace the air cleaner filter element sub-assembly. NEXT --> See step 21
19. REPLACE EGR VALVE ASSEMBLY Replace 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) . NEXT --> See step 21
20. CHECK AND REPAIR VVT SYSTEM Check and repair the VVT system. NEXT: Go to next step
21. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED (DTC P050B) NOTE: In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data). Connect 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. 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: P050B. Check the DTC judgment result. NEXT --> END
22. 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)

The battery supplies electricity to the ECM even when the power switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls below a minimum level, the memory is cleared and the ECM determines that there is a malfunction in the power supply circuit. The next time the engine is started, the ECM illuminates the MIL and sets the DTC.

HINT

If DTC P0560 is set, the ECM does not store other DTCs or the data stored in the ECM may be partly cleared.

Scheme 586

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: P0560.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform 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 587

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.

1. CHECK HARNESS AND CONNECTOR (ECM - EFI MAIN FUSE) Disconnect the negative battery terminal. Disconnect the positive battery terminal. Remove the EFI MAIN fuse from the engine room relay block. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance (Check for Open) Tester Connection Condition Specified Condition EFI MAIN fuse (2) - A57-20 (BATT) Always Below 1 ohms Standard Resistance (Check for Short) Tester Connection Condition Specified Condition EFI MAIN fuse (2) or A57-20 (BATT) - Body ground Always 10 kohms or higher Reinstall the EFI MAIN fuse. Reconnect the ECM connector. Reconnect the positive battery terminal. Reconnect the negative battery terminal. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - EFI MAIN FUSE) OK: Go to next step
2. INSPECT BATTERY Check that the battery is not discharged or weak. OK Battery is not discharged or weak. NG --> CHARGE OR REPLACE BATTERY OK: Go to next step
3. CHECK BATTERY TERMINAL Check that the battery terminals are not loose or corroded. OK Battery terminals are not loose or corroded. NG --> REPAIR OR REPLACE BATTERY TERMINAL OK: 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. 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 turn the Techstream off. Turn the power switch on (IG) and turn the Techstream on. Wait for 5 seconds. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC P0560 is output A DTC is not output B B --> See step 5 A --> See step 6
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)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The ECM continuously monitors its internal memory status. This self-check ensures that the ECM is functioning properly. It is diagnosed by internal "mirroring" of the main CPU and sub CPU to detect Random Access Memory (RAM) errors. If outputs from these CPUs are different and deviate from the standards, the ECM will illuminate the MIL and set the DTC immediately.

Scheme 588

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 16 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: P0604.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform 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.

HINT

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

1. READ OUTPUT DTC (DTC P0604) 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 turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the battery negative (-) terminal and wait for 1 minute. Connect the cable to the battery negative (-) terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Wait 16 seconds or more. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0604 is output B B --> See step 3 A --> See step 2
2. 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)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from the CPUs are different and deviate from the standards, the ECM will illuminate the MIL and set the DTC immediately.

Scheme 589

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 16 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: P0606.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform 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.

1. READ OUTPUT DTC (DTC P0606) 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 turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the battery negative (-) terminal and wait for 1 minute. Connect the cable to the battery negative (-) terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Wait 16 seconds or more. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0606 is output B B --> See step 3 A --> See step 2
2. 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)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The ECM continuously monitors its internal processors (CPUs) and heated oxygen sensor transistors. This self-check ensures that the ECM is functioning properly.

Scheme 590

1. Stop the engine for 30 minutes or more [A].
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG) and 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 [B].
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 wait 2 minutes [C].
9. Warm up the engine until the engine coolant temperature is 75°C (167°F) or higher [D].
10. Idle the engine for 1 minute [E].
11. Accelerate the vehicle to 50 mph (80 km/h) and stop the vehicle [F].
12. Drive the vehicle at 35 to 50 mph (56 to 80 km/h) for 5 minutes or more [G].
13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
14. Read the pending DTC [H].
15. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Input the DTC: P0607, P0136, P0137 or P0138.
18. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] through [G].
19. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
20. 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.
21. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-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 591

1. CHECK ANY OTHER DTCS OUTPUT Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to P0607 and P0136, P0137 or P0138 are output A P0607 is output B B --> See step 3 A: Go to next step
2. INSPECT DTC (P0136, P0137 OR P0138) Inspect the P0136, P0137 or P0138 flowchart. HINT: If P0136 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv) . Then proceed to "INSPECT ECM". If P0137 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv) . Then proceed to "INSPECT ECM". If P0138 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv) . Then proceed to "INSPECT ECM". If DTC P0607 and P0136, P0137 or P0138 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or more). NEXT --> See step 6
3. CHECK FOR EXHAUST GAS LEAK 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 and rev the engine. Check for exhaust gas leaks around the heated oxygen sensor. If any exhaust gas leaks are present, repair them and proceed to 4 "PERFORM CONFIRMATION DRIVING PATTERN". If no exhaust gas leaks are present, proceed to «CONFIRMATION DRIVING PATTERN»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0327-p1451-phv) "PERFORM CONFIRMATION DRIVING PATTERN". HINT: If no exhaust gas leaks are present, a malfunction in the heated oxygen sensor circuit is suspected. If any exhaust gas leaks are present around the heated oxygen sensor, noise appears in the output voltage of the heated oxygen sensor. NEXT: Go to next step
4. PERFORM CONFIRMATION DRIVING PATTERN Clear the DTC. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine. Warm up the engine until the engine coolant temperature becomes 75°C (167°F) or more. Perform the driving pattern. Accelerate the vehicle to 50 mph (80 km/h) and stop the vehicle. Drive the vehicle between 38 and 50 mph (60 and 80 km/h) for 5 minutes. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to P0607 and P0136, P0137 or P0138 are output A Only P0607 B No DTC output C C --> See step 6 B --> See step 7 A: Go to next step
5. INSPECT DTC (P0136, P0137 OR P0138) Inspect the P0136, P0137 or P0138 flowchart. HINT: If P0136 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv) . Then proceed to "INSPECT ECM". If P0137 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv) . Then proceed to "INSPECT ECM". If P0138 is output, troubleshoot for that DTC first. Refer to «INSPECTION PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0010-p0300-phv) . Then proceed to "INSPECT ECM". If DTC P0607 and P0136, P0137 or P0138 are output, the output voltage of the heated oxygen sensor may remain close to 0 V or become high (around 1 V or more). NEXT: Go to next step
6. INSPECT ECM Clear the DTC. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__dtc-checkclear) . Stop the engine and wait for 30 minutes. Connect the Techstream to the DLC3. Turn the power switch on (IG) and turn the Techstream on. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) . Start the engine and allow it to idle for 2 minutes. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Check the DTCs. Result Result Proceed to DTC is not output A P0607 is output B B --> See step 7 A --> END
7. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The main CPU and sub CPU of the ECM communicate with each other. The main CPU monitors the communications and WDC pulses from the sub CPU. When the signal malfunctions below deviate, the DTC is stored.

Scheme 592

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 16 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: P060A.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform 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.

1. READ OUTPUT DTC (DTC P060A) 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 turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the battery negative (-) terminal and wait for 1 minute. Connect the cable to the battery negative (-) terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Wait 16 seconds or more. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P060A is output B B --> See step 3 A --> See step 2
2. 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)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

This DTC is output when a communication error occurs in the ECM.

Scheme 593

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 16 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: P060B.
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.

1. READ OUTPUT DTC (DTC P060B) 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. Turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Wait 16 seconds or more. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P060B is output B DTC P060B and P0327 or P0328 are output C C --> See step 4 B --> See step 3 A --> See step 2
2. 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)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
4. GO TO DTC (P0327 AND P0328). Refer to «DTC P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor); DTC P0328: Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostic-codes-p0327-p1451-phv)

The ECM monitors the input signals of the No. 1 throttle position sensor. When the ECM monitors the input signal of the No. 1 throttle position sensor, if the input signal and control signal deviate, the DTC is stored.

Scheme 594

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 16 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: P060E.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform 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.

1. READ OUTPUT DTC (DTC P060E) 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 turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the battery negative (-) terminal and wait for 1 minute. Connect the cable to the battery negative (-) terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Wait 16 seconds or more. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P060E is output B B --> See step 3 A --> See step 2
2. 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)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

The ECM monitors its internal operation and stores this DTC when it detects an internal malfunction.

The ECM monitors its internal operation. If the internal operation is malfunctioning, the ECM illuminates the MIL and stores a DTC.

Scheme 595

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 30 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: P062F.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the judgment result shows INCOMPLETE or UNKNOWN, perform 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.

1. READ OUTPUT DTC (DTC P062F) 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 turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute. Connect the cable to the negative (-) battery terminal. Connect the Techstream to the DLC3. Turn the power switch on (IG). Wait 30 seconds or more. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P062F is output B B --> See step 2 A --> See step 3
2. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)
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)

The ECM monitors the output voltage to the throttle actuator. This self-check ensures that the ECM is functioning properly. The output voltage is usually 0 V when the power switch is turned off. If the output voltage is higher than 7 V when the power switch is turned off, the ECM will illuminate the MIL and set the DTC the next time the power switch is turned on (IG).

Scheme 596

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 turn the Techstream off.
5. Wait for 30 seconds.
6. Turn the power switch on (IG) and turn the Techstream on.
7. Wait 5 seconds or more [A].
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: P0657.
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, perform steps [A] again.
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.

HINT

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

1. READ OUTPUT DTC (DTC P0657) 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 turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the battery negative (-) terminal and wait for 1 minute. Connect the cable to the battery negative (-) terminal. Turn the power switch on (IG) for 10 seconds. Turn the power switch off. Connect the Techstream to the DLC3. Turn the power switch on (IG). Wait 5 seconds or more. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. Result Result Proceed to DTC is not output A DTC P0657 is output B B --> See step 3 A --> See step 2
2. 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)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/engine-control-systems/#engine-control-system-service-information-phv)

HINT

*: Data List Name

This DTC is designed to detect a deviation in the output characteristics of a pressure sensor.

The pressure of the canister pressure sensor and manifold absolute pressure sensor is monitored 55 minutes after the power switch is turned off. If there is a difference in the pressures, the MIL is illuminated (2 trip detection logic).

HINT

Correct judgment may not be possible when the altitude is 13124 ft (4000 m) or more.

Scheme 597

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) [A].
4. Put the engine in inspection mode. Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-phv/pre-iii-2010-2011/remont/hoistjack/#introduction-phv) .
5. Start the engine and Idle for 10 seconds [B]
6. Turn the power switch off and wait for 30 seconds.
7. Leave the power switch off for 55 minutes [C]
8. Connect the Techstream to the DLC3.
9. Turn the power switch on (IG) and turn the Techstream on.
10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
11. Read the pending DTC [D].
12. If a pending DTC is output, the system is malfunctioning. HINT: If a pending DTC is not output, perform the following procedure.
13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
14. Input the DTC: P106A.
15. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions UNKNOWN Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit 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 [C].
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Check the judgment result. HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal.
18. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-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

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 P106A) 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 P106A is output A DTC P106A and other DTCs are output B HINT: If any DTCs other than P106A are output, troubleshoot those DTCs first. B --> See step 6 A: Go to next step
2. READ VALUE USING TECHSTREAM (VAPOR PRESSURE PUMP AND MAP) Connect the Techstream to the DLC3. Turn the power switch on (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Pump and MAP. Compare the Vapor Pressure Pump and MAP data from the Data List with day's atmospheric pressure*. HINT: *: Standard atmospheric pressure is 101 kPa (760 mmHg) at sea level. The atmospheric pressure decreases by approximately 1 kPa (7.5 mmHg) for every 100 m of elevation increase. Atmospheric pressure is also affected by weather conditions. The Atmosphere pressure listed in the Data List cannot be used as a reference for this check. If you do not know the atmospheric pressure refer to the Vapor Pressure Pump value of other vehicles in the workshop and check the difference in pressure. RESULT Result Proceed to If the Vapor Pressure Pump value differs from the atmospheric pressure by +/- 3.5 kPa (+/- 26.25 mmHg) or more A If the MAP value differs from the atmospheric pressure by +/- 3.5 kPa (+/- 26.25 mmHg) or more B B --> See step 4 A: Go to next step
3. 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 --> See step 5
4. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Replace the manifold absolute pressure sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT: Go to next step
5. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the power switch on (IG) and the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / MAP and Vapor Pressure Pump. Confirm that the difference between Vapor Pressure Pump and MAP are 3.5 kPa (+/- 26.25 mmHg) or less. NEXT --> END
6. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-phv/pre-iii-2010-2011/remont/testing-diagnostics/#engine-control-sfi-system-diagnostics-introduction-phv__diagnostic-trouble-code-chart)

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 598

Scheme 599

1. P1420: EVAP (evaporative emission) small leak In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than the second reference pressure, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets the DTC (2 trip detection logic).
2. P1421: EVAP gross leak In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leakage, illuminates the MIL and sets the DTC (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

P1420: EVAP SMALL LEAK

P1421: EVAP GROSS LEAK

Refer to 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: P1420 or P1421.
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 600

1. P1422: Fuel tank small leak In operation G, the leak detection pump creates negative pressure (vacuum) in the fuel tank and the fuel tank pressure is measured. If the stabilized system pressure is higher than the third reference pressure, the ECM determines that the fuel tank has a small leakage. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).
2. P1423: Fuel tank gross leak In operation G, the leak detection pump creates negative pressure (vacuum) in the fuel tank and the fuel tank pressure is measured. If the stabilized system pressure is higher than [third reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the fuel tank has a large leakage. The ECM illuminates the MIL and sets the DTC (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

P1422: FUEL TANK SMALL LEAK

P1423: FUEL TANK GROSS LEAK

Refer to 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: P1422 or P1423.
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 .

Scheme 601

1. P1451: Pressure sensor abnormal voltage fluctuation or being constant If the pressure sensor output voltage fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC. Alternatively, if the sensor output voltage does not change for 10 seconds, the ECM interprets this as the sensor voltage being constant, and stops the monitor. The ECM then illuminates the MIL and sets the DTC. (Both malfunctions are detected using 2 trip detection logic).
2. P1452: Pressure sensor voltage low If the pressure sensor output voltage is below 0.45 V, the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).
3. P1453: Pressure sensor voltage high If the pressure sensor voltage output is 4.9 V or more, the ECM interprets this as an open or short circuit malfunction in the pressure sensor or its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip detection logic).

P1451 (NOISE MONITOR)

P1451 (STUCK MONITOR)

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

P1452 AND P1453

P1451: PRESSURE SENSOR NOISE

P1451: PRESSURE SENSOR STUCK

P1452: PRESSURE SENSOR LOW VOLTAGE

P1453: PRESSURE SENSOR HIGH VOLTAGE

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 DTC 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: P1451, P1452 or P1453.
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.

Note. When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel tank cap. Do not disassemble the canister pump module. The Techstream is required to conduct the following diagnostic troubleshooting procedure.

Scheme 602

Scheme 603

1. CONFIRM DTC AND FUEL TANK PRESSURE 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. Enter the following menus: Powertrain / Engine and ECT / Data List / Vapor Pressure Tank. Read the EVAP (evaporative emission) pressure displayed on the Techstream. Result Display (DTC Output) Result Suspected Trouble Area Proceed to P1451 - Pressure sensor C P1452 Less than -17.187 kPa (-128.93 mmHg) Wire harness/connector (ECM - fuel tank pressure sensor) Fuel tank pressure sensor Short in ECM circuit A P1453 More than 23.937 kPa (179.58 mmHg) Wire harness/connector (ECM - fuel tank pressure sensor) Fuel tank pressure sensor Open in ECM circuit B C --> See step 11 B --> See step 4 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (FUEL TANK PRESSURE SENSOR - ECM) Turn the power switch off. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Result Tester Connection Condition Result Suspected Trouble Area Proceed to D28-77 (PTNK) - Body ground Always 10 ohms or less Wire harness/connector (ECM - fuel tank pressure sensor) Short in fuel tank pressure sensor circuit A 10 kohms or more Wire harness/connector (ECM - fuel tank pressure sensor) Short in ECM circuit B Reconnect the ECM connector. B --> See step 9 A: Go to next step
3. 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. Result Tester Connection Condition Result Suspected Trouble Area Proceed to D28-77 (PTNK) - Body ground Always 10 kohms or higher Short in fuel tank pressure sensor circuit A Below 10 ohms Short in wire harness/connector (ECM - fuel tank pressure sensor) B Reconnect the No. 3 frame wire to the floor wire side connector. Reconnect the ECM connector. B --> See step 7 A: Go to next step
4. 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 on (IG). Measure the voltage and resistance according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition R45-2 (VC) - Body ground Power switch on (IG) 4.5 to 5.5 V Standard Resistance (Check for Open) Tester Connection Condition Specified Condition R45-10 (E2) - Body ground Always Below 100 ohms Result Result Suspected Trouble Area Proceed to Voltage and resistance within standard ranges Open in fuel tank pressure sensor circuit A Voltage and resistance outside standard ranges Open in wire harness/connector (ECM - fuel tank pressure sensor) B 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. B --> See step 7 A: Go to next step
5. 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 (Check for Open) Tester Connection Condition Specified Condition No. 3 frame wire fuel tank pressure sensor side terminal 3 - R45-2 (VC) Always Below 1 ohms No. 3 frame wire fuel tank pressure sensor side terminal 2 - R45-9 (PTNK) Always Below 1 ohms No. 3 frame wire fuel tank pressure sensor side terminal 1 - R45-10 (E2) Always Below 1 ohms Standard Resistance (Check for Short) 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 No. 3 frame wire fuel tank pressure sensor side terminal 2 or R45-9 (PTNK) - 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 --> See step 8 OK: Go to next step
6. REPLACE VAPOR PRESSURE SENSOR ASSY Replace the fuel tank pressure sensor. Refer to «REMOVAL»(/toyota/prius-phv/pre-iii-2010-2011/remont/auxiliary-emission-control-systems/#emission-control-system-service-information-phv) . NEXT --> See step 10
7. REPAIR OR REPLACE HARNESS OR CONNECTOR HINT: If the tailpipe has been removed, go to the next step before reinstalling it. NEXT --> See step 10
8. REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL TANK PRESSURE SENSOR - FLOOR WIRE) Repair or replace No. 3 frame wire. NEXT --> See step 10
9. 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 --> See step 10
10. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR) 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: P1451, P1452 or P1453. Check the DTC judgment result. HINT: If DTC judgment result is NORMAL, the repair has been successfully completed. NEXT --> END
11. GO TO EVAP SYSTEM. Refer to «EVAP System»(/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
• CHECK FOR INTERMITTENT PROBLEMS
• REMOVAL
• COMPONENTS
• DIAGNOSTIC TROUBLE CODE CHART
• REMOVAL
• ON-VEHICLE INSPECTION
• CHECKING MONITOR STATUS
• INSTALLATION
• COMPONENTS
• INSPECTION PROCEDURE
• DESCRIPTION
• DESCRIPTION