Engine Control System (diagnostic Codes (p0300 - p0657)) Toyota Prius C I

DESCRIPTION

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

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

MONITOR DESCRIPTION

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

1. Within the first 1000 crankshaft revolutions after the engine starts, an excessive number of misfires (approximately 10 to 70 misfires per 1000 crankshaft revolutions) occurs once.
2. An excessive number of misfires (approximately 10 to 70 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

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

1. At a high engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected once.
2. At a normal engine speed, a sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected 3 times.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

MISFIRE

MONITOR PERIOD OF EMISSION-RELATED MISFIRE

MONITOR PERIOD OF CATALYST-DAMAGING MISFIRE (MIL BLINKS)

TYPICAL MALFUNCTION THRESHOLDS

MONITOR PERIOD OF EMISSION-RELATED MISFIRE

MONITOR PERIOD OF CATALYST-DAMAGING MISFIRE (MIL BLINKS)

MONITOR RESULT

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

P0300: MISFIRE / EWMA MISFIRE

P0300: MISFIRE / MISFIRE RATE

P0301: MISFIRE / EWMA MISFIRE1

P0301: MISFIRE / MISFIRE RATE1

P0302: MISFIRE / EWMA MISFIRE2

P0302: MISFIRE / MISFIRE RATE2

P0303: MISFIRE / EWMA MISFIRE3

P0303: MISFIRE / MISFIRE RATE3

P0304: MISFIRE / EWMA MISFIRE4

P0304: MISFIRE / MISFIRE RATE4

HINT

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

Initial value for (previous average) = 0

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
3. Turn the Techstream on.
4. Record the DTC(s) and freeze frame data.
5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Using the Techstream, switch the ECM from normal mode to check mode. Refer to «CHECK MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-mode-procedure) .
8. Read the misfire counts of each cylinder, Cylinder #1 Misfire Count to Cylinder #4 Misfire Count, with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.
9. Drive the vehicle so that the vehicle conditions displayed in Misfire RPM and Misfire Load of the Data List are the same as the freeze frame data. Perform this step several times. HINT: In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, confirm the Misfire RPM and Misfire Load in the Data List. Engine speed Duration Idling 4.5 minutes or more 1000 4.5 minutes or more 2000 2.5 minutes or more 3000 1.5 minutes or more
10. Check whether misfires have occurred by checking DTCs and freeze frame data. HINT: Do not turn the ignition switch off until the output DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data are cleared.
11. Record the DTC(s), freeze frame data and misfire counts.
12. Turn the ignition switch off and wait for at least 30 seconds.
13. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

WIRING DIAGRAM

Refer to DTC P0102 for the mass air flow meter sub-assembly circuit. Refer to WIRING DIAGRAM .

Refer to Fuel Injector Circuit. Refer to WIRING DIAGRAM .

INSPECTION PROCEDURE

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

HINT

1. If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
2. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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.
3. If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.
4. If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem: There was insufficient fuel in the tank. Improper fuel was used. The spark plugs have been contaminated. The problem requires further diagnosis.
5. After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #4 Misfire Count).
6. Be sure to confirm that no misfiring cylinder DTCs are stored again by conducting the confirmation driving pattern after finishing repairs.
7. When one of Short FT #1 or Long FT #1 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be rich (-20% or less) or lean (20% or higher).
8. When Coolant Temp in the freeze frame data is below 75°C (167°F), the misfires have occurred only while warming up the engine.
9. An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs to be stored.

Scheme 152

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0300, P0301, P0302, P0303 and/or P0304 are output A DTC P0300, P0301, P0302, P0303 and/or P0304 and other DTCs are output B HINT: If any DTCs other than P0300, P0301, P0302, P0303 and/or P0304 are output, troubleshoot those DTCs first. B --> See step 37 A: Go to next step
2. CHECK PCV HOSE CONNECTIONS Check the PCV hose connections. Refer to «COMPONENTS»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . OK PCV valve and hose are correctly connected and are not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
3. READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Misfire RPM and Misfire Load. Read and note the Misfire RPM and Misfire Load values. HINT: The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred. NEXT: Go to next step
4. READ VALUE USING TECHSTREAM (CYLINDER MISFIRE COUNT) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Cylinder #1 Misfire Count, Cylinder #2 Misfire Count, Cylinder #3 Misfire Count and Cylinder #4 Misfire Count. Start the engine and allow the engine to idle. Read each value for Cylinder #1 Misfire Count to Cylinder #4 Misfire Count displayed on the Techstream. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using Techstream (Misfire RPM and Misfire Load)" procedures above [A]. Read the Cylinder #1 Misfire Count to Cylinder #4 Misfire Count or DTCs displayed on the Techstream [B]. RESULT Result Proceed to Most misfires occur in only 1 or 2 cylinders A 3 cylinders or more have equal misfire counts B HINT: If it is difficult to reproduce misfires for each cylinder, check the Data List item called Misfire Margin. Try to find vehicle driving conditions that lower the Misfire Margin value. Values above 30% are considered normal. If the freeze frame data record of the engine coolant temperature is below 75°C (167°F), the misfire may be detected only when the engine is cold. B --> See step 18 A: Go to next step
5. INSPECT SPARK PLUG Inspect the spark plug of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 3»(/toyota/prius-c/i-2011-2015/remont/ignition-system/#ignition-system-inspection) . HINT: Perform "Inspection After Repair" after replacing the spark plug. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 38 OK: Go to next step
6. CHECK FOR SPARK (SPARK TEST) Perform a spark test. Refer to «ON-VEHICLE INSPECTION - Step 1»(/toyota/prius-c/i-2011-2015/remont/ignition-system/#ignition-system-inspection) . HINT: If the result of the spark test is normal, proceed to the next step. Perform "Inspection After Repair" after repairing or replacing the ignition system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT: Go to next step
7. CHECK CYLINDER COMPRESSION PRESSURE Measure the cylinder compression pressure of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 8»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information) . HINT: Perform "Inspection After Repair" after repairing or replacing the engine assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION OK: Go to next step
8. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY) Disconnect the ECM connector. Turn the ignition switch to ON (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition C10-20 (#10) - C10-51 (E01) Ignition switch ON (IG) 11 to 14 V C10-17 (#20) - C10-51 (E01) Ignition switch ON (IG) 11 to 14 V C10-18 (#30) - C10-51 (E01) Ignition switch ON (IG) 11 to 14 V C10-19 (#40) - C10-51 (E01) Ignition switch ON (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) NG --> See step 41 OK: Go to next step
9. CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor). Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/fuel-system/#fuel-system-service-information) . HINT: Perform "Inspection After Repair" after replacing the fuel injector assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 39 OK: Go to next step
10. CHECK VALVE CLEARANCE OF MISFIRING CYLINDER Check the valve clearance. Refer to «ON-VEHICLE INSPECTION - Step 1»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information) . NG --> See step 46 OK: Go to next step
11. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-intake-system-inspection) . OK No leaks from intake system. HINT: Perform "Inspection After Repair" after repairing or replacing the intake system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
12. CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(/toyota/prius-c/i-2011-2015/remont/fuel-system/#fuel-system-inspection) . NG --> See step 36 OK: Go to next step
13. READ VALUE USING TECHSTREAM (COOLANT TEMP). Refer to «PROCEDURE - Step 5»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> See step 40 OK: Go to next step
14. READ VALUE USING TECHSTREAM (MAF). Refer to «PROCEDURE - Step 6»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> See step 31 OK: Go to next step
15. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH). Refer to «PROCEDURE - Step 4»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> See step 44 OK: Go to next step
16. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK B B --> See step 18 A: Go to next step
17. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . OK --> See step 31 NG --> See step 45
18. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-intake-system-inspection) . OK No leaks from intake system. HINT: Perform "Inspection After Repair" after repairing or replacing the intake system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
19. CHECK FUEL PRESSURE Check the fuel pressure. Refer to «ON-VEHICLE INSPECTION - Step 2»(/toyota/prius-c/i-2011-2015/remont/fuel-system/#fuel-system-inspection) . NG --> See step 36 OK: Go to next step
20. READ VALUE USING TECHSTREAM (COOLANT TEMP). Refer to «PROCEDURE - Step 5»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> See step 40 OK: Go to next step
21. READ VALUE USING TECHSTREAM (MAF). Refer to «PROCEDURE - Step 6»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> See step 31 OK: Go to next step
22. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH). Refer to «PROCEDURE - Step 4»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> See step 44 OK: Go to next step
23. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK B B --> See step 25 A: Go to next step
24. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 45 OK: Go to next step
25. INSPECT SPARK PLUG Inspect the spark plug of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 3»(/toyota/prius-c/i-2011-2015/remont/ignition-system/#ignition-system-inspection) . HINT: Perform "Inspection After Repair" after replacing the spark plug. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 38 OK: Go to next step
26. CHECK FOR SPARK (SPARK TEST) Perform a spark test. Refer to «ON-VEHICLE INSPECTION - Step 1»(/toyota/prius-c/i-2011-2015/remont/ignition-system/#ignition-system-inspection) . HINT: If the result of the spark test is normal, proceed to the next step. Perform "Inspection After Repair" after repairing or replacing the ignition system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT: Go to next step
27. CHECK CYLINDER COMPRESSION PRESSURE Measure the cylinder compression pressure of the misfiring cylinder. Refer to «ON-VEHICLE INSPECTION - Step 8»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information) . HINT: Perform "Inspection After Repair" after repairing or replacing the engine assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION OK: Go to next step
28. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY) Disconnect the ECM connector. Turn the ignition switch to ON (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition C10-20 (#10) - C10-51 (E01) Ignition switch ON (IG) 11 to 14 V C10-17 (#20) - C10-51 (E01) Ignition switch ON (IG) 11 to 14 V C10-18 (#30) - C10-51 (E01) Ignition switch ON (IG) 11 to 14 V C10-19 (#40) - C10-51 (E01) Ignition switch ON (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) NG --> See step 41 OK: Go to next step
29. CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor). Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/fuel-system/#fuel-system-service-information) . HINT: Perform "Inspection After Repair" after replacing the fuel injector assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 39 OK: Go to next step
30. CHECK VALVE CLEARANCE OF MISFIRING CYLINDER Check the valve clearance. Refer to «ON-VEHICLE INSPECTION - Step 1»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information) . NG --> See step 46 OK: Go to next step
31. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . HINT: Repair any problems. NEXT: Go to next step
32. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0300, P0301, P0302, P0303 or P0304. Check the DTC judgment result. RESULT Result Proceed to ABNORMAL (DTC P0300, P0301, P0302, P0303 and/or P0304 is output) A NORMAL (DTC is not output) B B --> END A: Go to next step
33. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM). Refer to «PROCEDURE - Step 3»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
34. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Replace the mass air flow meter sub-assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . HINT: If the results of the inspections performed in steps 14 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly. Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT: Go to next step
35. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignitions switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0300, P0301, P0302, P0303 or P0304. Check the DTC judgment result. RESULT Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0300, P0301, P0302, P0303 and/or P0304 is output) B B --> See step 42 A --> END
36. CHECK FUEL LINE Check the fuel lines for leaks or blockage. HINT: Perform "Inspection After Repair" after replacing the fuel pump with filter assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> REPAIR OR REPLACE FUEL LINE OK --> See step 43
37. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
38. REPLACE SPARK PLUG. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
39. REPLACE FUEL INJECTOR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/fuel-system/#fuel-system-service-information__removal)
40. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
41. GO TO FUEL INJECTOR CIRCUIT. Refer to «Fuel Injector Circuit»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p1604-u0293-circuit-tests)
42. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
43. REPLACE FUEL PUMP WITH FILTER ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/fuel-system/#fuel-system-service-information)
44. ADJUST VALVE TIMING. Refer to «REASSEMBLY»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information)
45. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)
46. ADJUST VALVE CLEARANCE. Refer to «ADJUSTMENT»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information)

A flat-type knock control sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 kHz and 15 kHz.

The knock control sensor is 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. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

HINT

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

Reference: Inspection using an oscilloscope

Scheme 153

HINT

The correct waveform is as shown.

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

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

P0327

P0328

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Start the engine and wait 5 minutes.
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0327 or P0328.
12. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, idle the engine for 5 minutes and check the DTC judgment result again.
13. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 154

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 155

1. READ VALUE USING TECHSTREAM (KNOCK FEEDBACK VALUE) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Warm up the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Knock Feedback Value. Read the value while driving the vehicle. OK The value changes. HINT: Malfunction does not occur Knock Feedback Value changes Malfunctions occur Knock Feedback Value does not change The Knock Feedback Value change can be confirmed by running the engine with a high load, for example, by racing the engine. NG --> See step 2 OK --> See step 5
2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR) Disconnect the knock control sensor connector. Turn the ignition switch to ON (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E1-2 - E1-1 Ignition switch ON (IG) 4.5 to 5.5 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Knock Control Sensor) NG --> See step 4 OK: Go to next step
3. INSPECT KNOCK CONTROL SENSOR Inspect the knock control sensor. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . HINT: Perform "Inspection After Repair" after replacing the knock control sensor. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 7 OK --> See step 6
4. CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM) Disconnect the knock control sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E1-2 - C10-123 (KNK1) Always Below 1 ohms E1-1 - C10-124 (EKNK) Always Below 1 ohms E1-2 or C10-123 (KNK1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 6
5. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
6. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
7. REPLACE KNOCK CONTROL SENSOR. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

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

The crank angle 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 crank angle sensor plate rotates and, as each tooth passes by the pickup coil, a pulse signal is created. The pickup coil generates 34 signals per crankshaft revolution. Based on these signals, the ECM calculates the crankshaft position and engine speed. Using these calculations, the fuel injection and ignition timing are controlled.

Scheme 156

1. Reference: Inspection using an oscilloscope. HINT: The correct waveform is as shown. G2+ stands for the cam position sensor signal, and NE+ stands for the crank position sensor signal. Grounding failure of the shielded wire may cause noise in the waveforms. ECM Terminal Name CH1: Between G2+ and G2- CH2: Between NE+ and NE- Tester Range 5 V/DIV., 20 ms./DIV. Condition Idling

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

ALL

P0335: CRANK POSITION SENSOR RANGE CHECK/RATIONALITY

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

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

P0335: CRANK POSITION SENSOR RANGE CHECK/RATIONALITY

P0335: CRANK POSITION SENSOR VERIFY PULSE INPUT

COMPONENT OPERATING RANGE

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Start the engine.
8. Idle the engine for 20 seconds or more [A].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0335.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 157

HINT

1. After performing the inspection procedure for the crank position sensor, if DTC P0335 is output again, check the following items related to the cam position sensor. Installation condition of the cam position sensor Installation condition of the camshaft Connection of the cam position sensor connector
2. If no problem is found by this diagnostic troubleshooting procedure, check for problems by referring to the engine mechanical article.
3. The engine speed can be checked by using the Techstream. To perform the check, follow the procedures below: Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Engine Speed. The engine speed may be indicated as zero despite the engine running normally. This is caused by a lack of NE signals from the crank position sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the crank position sensor output voltage is insufficient.
4. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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 158

1. READ VALUE USING TECHSTREAM (ENGINE SPEED) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Engine Speed. Read the values displayed on the Techstream while the engine is running. Standard Correct values are displayed. HINT: To check the engine speed change, display the graph on the Techstream. If the engine does not start, check the engine speed while cranking. If the engine speed indicated on the Techstream remains at zero (0), there may be an open or short in the crank position sensor circuit. NG --> See step 2 OK --> See step 9
2. INSPECT CRANK POSITION SENSOR (RESISTANCE) Inspect the crank position sensor. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . NG --> See step 10 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (CRANK POSITION SENSOR - ECM) Disconnect the crank position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition C11-1 - C10-78 (NE+) Always Below 1 ohms C11-2 - C10-110 (NE-) Always Below 1 ohms C11-1 or C10-78 (NE+) - Body ground Always 10 kohms or higher C11-2 or C10-110 (NE-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK SENSOR INSTALLATION (CRANK POSITION SENSOR) Check the crank position sensor installation. OK Crank position sensor is installed correctly. NG --> See step 7 OK: Go to next step
5. INSPECT CRANKSHAFT (TEETH OF CRANK ANGLE SENSOR PLATE) Inspect the teeth of the crank angle sensor plate. OK Crank angle sensor plate does not have any cracks or deformation. NG --> See step 6 OK --> See step 8
6. REPLACE CRANKSHAFT. Refer to «DISASSEMBLY»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information)
7. SECURELY REINSTALL CRANK POSITION SENSOR. Refer to «INSTALLATION»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
9. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
10. REPLACE CRANK POSITION SENSOR. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

The cam position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft timing rotor passes through the cam position sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice, the voltage is generated 3 times in the cam position sensor. The generated voltage in the sensor acts as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.

1. Reference: Inspection using an oscilloscope. Refer to «DESCRIPTION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0300-p0657) .

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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Start the engine.
8. Idle the engine for 10 seconds or more [A].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0340.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0335. Refer to WIRING DIAGRAM .

HINT

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
2. If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.

Scheme 159

1. INSPECT CAM POSITION SENSOR Inspect the cam position sensor. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . NG --> See step 12 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (CAM POSITION SENSOR - ECM) Disconnect the cam position sensor connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition C13-1 - C10-82 (VV1+) Always Below 1 ohms C13-2 - C10-114 (VV1-) Always Below 1 ohms C13-1 or C10-82 (VV1+) - Body ground Always 10 kohms or higher C13-2 or C10-114 (VV1-) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK SENSOR INSTALLATION (CAM POSITION SENSOR) Check the cam position sensor installation. OK Cam position sensor is installed correctly. NG --> See step 8 OK: Go to next step
4. INSPECT INTAKE CAMSHAFT (TIMING ROTOR) Check the timing rotor of the intake camshaft. OK Timing rotor does not have any cracks or deformation. HINT: Perform "Inspection After Repair" after replacing the intake camshaft. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 10 OK: Go to next step
5. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH). Refer to «PROCEDURE - Step 4»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> See step 11 OK: Go to next step
6. REPLACE CAM POSITION SENSOR Replace the cam position sensor. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . NEXT: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0340) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0340 is output A DTC is not output B HINT: If the engine does not start, replace the ECM. B --> END A --> See step 9
8. SECURELY REINSTALL CAM POSITION SENSOR. Refer to «INSTALLATION»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
9. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
10. REPLACE INTAKE CAMSHAFT. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information__removal)
11. ADJUST VALVE TIMING. Refer to «REASSEMBLY»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-mechanical-service-information)
12. REPLACE CAM POSITION SENSOR. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

HINT

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

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

The DIS is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil assembly and one spark plug is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is applied directly to each spark plug. The spark of the spark plugs passes from the center electrode to the ground electrodes.

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 the current supplied to the primary coil on and off. 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 160

Scheme 161

1. Reference: Inspection using an oscilloscope.

HINT

1. The correct waveform is as shown.

1. While idling the engine, check the waveform between terminals IGT (1 to 4) and E1, and IGF1 and E1 of the ECM connector.

Scheme 162

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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Start the engine.
8. Idle the engine for 10 seconds or more [A].
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0351, P0352, P0353 or P0354.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 163

Scheme 164

Scheme 165

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 166

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 Tester Connection Condition Specified Condition C5-4 (GND) - Body ground Always Below 1 ohms C6-4 (GND) - Body ground Always Below 1 ohms C7-4 (GND) - Body ground Always Below 1 ohms C8-4 (GND) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGNITION COIL ASSEMBLY) Disconnect the ignition coil assembly connectors. Turn the ignition switch to ON (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition C5-1 (+B) - C5-4 (GND) Ignition switch ON (IG) 11 to 14 V C6-1 (+B) - C6-4 (GND) Ignition switch ON (IG) 11 to 14 V C7-1 (+B) - C7-4 (GND) Ignition switch ON (IG) 11 to 14 V C8-1 (+B) - C8-4 (GND) Ignition switch ON (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Ignition Coil Assembly) NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM) Disconnect the ignition coil assembly connectors. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition C5-2 (IGF) - C10-102 (IGF1) Always Below 1 ohms C6-2 (IGF) - C10-102 (IGF1) Always Below 1 ohms C7-2 (IGF) - C10-102 (IGF1) Always Below 1 ohms C8-2 (IGF) - C10-102 (IGF1) Always Below 1 ohms C5-3 (IGT1) - C10-57 (IGT1) Always Below 1 ohms C6-3 (IGT2) - C10-56 (IGT2) Always Below 1 ohms C7-3 (IGT3) - C10-55 (IGT3) Always Below 1 ohms C8-3 (IGT4) - C10-54 (IGT4) Always Below 1 ohms C5-3 (IGT1) or C10-57 (IGT1) - Body ground Always 10 kohms or higher C6-3 (IGT2) or C10-56 (IGT2) - Body ground Always 10 kohms or higher C7-3 (IGT3) or C10-55 (IGT3) - Body ground Always 10 kohms or higher C8-3 (IGT4) or C10-54 (IGT4) - Body ground Always 10 kohms or higher C5-2 (IGF), C6-2 (IGF), C7-2 (IGF), C8-2 (IGF) or C10-102 (IGF1) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353 OR P0354) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Shuffle the arrangement of the ignition coil assemblies (among No. 1 to No. 4 cylinders). NOTE: Do not change the location of the connectors. Perform a simulation test. 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 HINT: Perform "Inspection After Repair" after replacing the ignition coil assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . B --> See step 6 A --> See step 7
5. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - NO. 1 INTEGRATION RELAY) Disconnect the ignition coil assembly connectors. Remove the No. 1 integration relay from the engine room relay block and junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition C5-1 (+B) - 2D-4 Always Below 1 ohms C6-1 (+B) - 2D-4 Always Below 1 ohms C7-1 (+B) - 2D-4 Always Below 1 ohms C8-1 (+B) - 2D-4 Always Below 1 ohms C5-1 (+B), C6-1 (+B), C7-1 (+B), C8-1 (+B) or 2D-4 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
6. REPLACE IGNITION COIL ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
7. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
8. REPLACE NO. 1 INTEGRATION RELAY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

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

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

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

P0401: EXHAUST GAS RECIRCULATION / VVT / EGR FLOW INSUFFICIENCY

Scheme 167

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
8. Accelerate the vehicle to 75 km/h (47 mph) or more by depressing the accelerator pedal for at least 10 seconds [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: When accelerating the vehicle, depress the accelerator pedal more than normal to start the engine.
9. Idle the engine for 30 seconds or more [C].
10. Accelerate the vehicle to 75 km/h (47 mph) with the shift lever in B [D]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
11. Perform fuel cut operation for 5 seconds or more, with the accelerator pedal fully released [E]. HINT: When fuel cut is operating "Idle Fuel Cut" in Data List is ON.
12. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor [F].
13. Check that Exhaust Gas Recirculation/VVT / Current is Complete. HINT: If the monitor item Exhaust Gas Recirculation/VVT / Current is Incomplete, perform the driving pattern again.
14. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Exhaust Gas Recirculation / VVT / Details.
15. Check the Details (EGR FLOW INSUFFICIENCY). HINT: Make sure that the value is between MIN and MAX.
16. If the monitor item Exhaust Gas Recirculation/VVT / Current is still Incomplete, perform the following procedure.
17. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
18. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
19. Enter the following menus: Power train / Engine and ECT / Utility / All Readiness.
20. Input the DTC: P0401.
21. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows NORMAL, the system is normal. If the DTC judgment result is INCOMPLETE or N/A, perform steps [D] and [E] again.
22. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. By using the Control the EGR Step Position Active Test, the operation of the EGR valve can be checked.
2. When the engine is idling steadily with the EGR valve fully closed, if the EGR valve is normal and it is opened using the Active Test, the Data List value changes as follows. Data List Change in Data List when Number of Steps is Increased Using Control the EGR Step Position Active Test Engine Speed Idle becomes rough MAP Pressure rises
3. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 168

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0401) Connect the Techstream to the DLC3. Turn the ignition switch to 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 11 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off and shift lever in P or N. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. NG --> See step 4 OK: Go to next step
3. INSPECT EGR VALVE ASSEMBLY Check if the EGR valve are clogged with deposits. Check if the EGR valve is closed. OK EGR valve is closed and no deposits. RESULT Result Proceed to NG A OK B B --> See step 5 A: Go to next step
4. REPLACE EGR VALVE ASSEMBLY Replace the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT: Go to next step
5. CHECK FOR DEPOSIT (INTAKE PORT AND 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 intake manifold, the EGR valve assembly and the exhaust manifold sub-assembly. This check may require the removal of components. Check if there is a build-up of deposits in the EGR valve of pipes. OK No deposits. HINT: Perform "Inspection After Repair" after repairing or replacing the exhaust system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step
6. INSPECT EGR COOLER ASSEMBLY Check for blockage of the EGR cooler assembly. NG --> See step 12 OK: Go to next step
7. READ VALUE USING TECHSTREAM (MAP) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAP. Read the MAP value. Standard Condition Techstream Display Ignition switch ON (IG) 80 to 110 kPa(abs) [600 to 825 mmHg(abs)] HINT: Standard atmospheric pressure is 101 kPa(abs) [758 mmHg(abs)]. For every 100 m (328 ft) increase in altitude, pressure drops by 1 kPa (7.5 mmHg). The pressure also varies due to the weather (high atmospheric pressure, low atmospheric pressure). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAP. Read the MAP value when idling the engine with the A/C switch and all accessory switches should be off and shift lever in P or N. Standard Engine Condition Techstream Display Idling Less than 80 kPa(abs) [600 mmHg(abs)] RESULT Result Proceed to NG A OK B B --> See step 10 A: Go to next step
8. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-intake-system-inspection) . OK No leaks in intake system. HINT: Perform "Inspection After Repair" after repairing or replacing the intake system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
9. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Replace the manifold absolute pressure sensor. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . NEXT: Go to next step
10. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending. Read the pending DTCs. HINT: If the pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P0401. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit NEXT --> END
11. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
12. REPLACE EGR COOLER ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)

Refer to DTC P0401. Refer to DESCRIPTION .

HINT

DTC P0403 is stored when the ignition switch is ON (IG).

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

Example

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

Scheme 169

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Start the engine and warm it up [B].
8. Drive the vehicle at 20 km/h (12 mph) or more for 10 minutes [C]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P0403.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system has a normal. If the judgment result shows ABNORMAL, the system has a malfunction.
14. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 170

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 171

1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed HINT: During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve. NG --> See step 2 OK --> See step 6
2. INSPECT EGR VALVE ASSEMBLY Inspect the EGR valve assembly. Refer to «INSPECTION»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 7 OK: Go to next step
3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF EGR VALVE ASSEMBLY) Disconnect the EGR valve assembly connector. Turn the ignition switch to ON (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition C18-5 (+B1) - Body ground Ignition switch ON (IG) 11 to 14 V C18-2 (+B2) - Body ground Ignition switch ON (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to EGR Valve Assembly) NG --> See step 5 OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - ECM) Disconnect the EGR valve assembly connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition C18-4 (EGR1) - C10-28 (EGR1) Always Below 1 ohms C18-3 (EGR2) - C10-27 (EGR2) Always Below 1 ohms C18-6 (EGR3) - C10-26 (EGR3) Always Below 1 ohms C18-1 (EGR4) - C10-25 (EGR4) Always Below 1 ohms C18-4 (EGR1) or C10-28 (EGR1) - Body ground Always 10 kohms or higher C18-3 (EGR2) or C10-27 (EGR2) - Body ground Always 10 kohms or higher C18-6 (EGR3) or C10-26 (EGR3) - Body ground Always 10 kohms or higher C18-1 (EGR4) or C10-25 (EGR4) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 8
5. CHECK HARNESS AND CONNECTOR (EGR VALVE ASSEMBLY - NO. 1 INTEGRATION RELAY) Disconnect the EGR valve assembly connector. Remove the No. 1 integration relay from the No. 2 engine room relay block and No. 2 junction block assembly. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition C18-5 (+B1) - 2C-4 Always Below 1 ohms C18-2 (+B2) - 2C-4 Always Below 1 ohms C18-5 (+B1) or 2C-4 - Body ground Always 10 kohms or higher C18-2 (+B2) or 2C-4 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> See step 9
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
7. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
9. REPLACE NO. 1 INTEGRATION RELAY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

The ECM uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) 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 30 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, the ECM illuminates the MIL and stored the DTC.

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

Scheme 172

TEXT IN ILLUSTRATION

Note. Replace the exhaust manifold (*6) and the front exhaust pipe assembly (*7) together when catalyst replacement is necessary. (Excluding air fuel ratio sensor *1 and heated oxygen sensor *2)

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

P0420: CATALYST EFFICIENCY / O2 STORAGE B1

HINT

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

Scheme 173

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
3. Turn the Techstream on.
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the ignition switch off and wait for at least 30 seconds.
6. Turn the ignition switch to ON (IG). and turn the Techstream on.
7. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor.
8. Check that Catalyst Efficiency / Current is Incomplete.
9. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
10. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
11. Drive the vehicle at approximately 75 km/h (47 mph) for 10 minutes or more [B]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: Drive the vehicle while keeping the engine load as constant as possible.
12. Turn the ignition switch off and wait for at least 30 seconds [C].
13. Turn the ignition switch to ON (IG). and turn the Techstream on.
14. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
15. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [D].
16. Drive the vehicle at approximately 75 km/h (47 mph) for 10 minutes or more [E]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: Drive the vehicle while keeping the engine load as constant as possible. The monitor item change to Complete as the Catalyst Efficiency monitor operates.
17. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].
18. Check if any DTCs (pending DTCs) are stored. HINT: If the monitor item does not change to Complete, and no pending DTCs are stored, perform the following procedure.
19. Drive the vehicle at approximately 100 km/h (62 mph) for 10 minutes or more [G]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. HINT: Drive the vehicle while keeping the engine load as constant as possible. The monitor item will change to Complete as the Catalyst Efficiency monitor operates.
20. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [H].
21. Check if any DTCs (pending DTCs) are stored. HINT: If the monitor item does not change to Complete, and no pending DTCs are stored, extend the driving time.
22. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

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 and heated oxygen sensors. This is to activate the sensors sufficiently to obtain appropriate inspection results.

Scheme 174

1. (a) Connect the Techstream to the DLC3 [A].
2. (b) Turn the ignition switch to ON (IG) and turn the Techstream on [B].
3. (c) Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) [C].
4. (d) Start the engine and warm it up with all the accessories switched off until the engine coolant temperature stabilizes [D].
5. (e) Run the engine at an engine speed of 2500 rpm for at least 3 minutes [E]. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, perform step [E] after charging control has completed.
6. (f) While running the engine at 2500 rpm for 2 seconds and 1500 rpm for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream [F].

HINT

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

Scheme 175

HINT

1. If a malfunction cannot be found when troubleshooting DTC P0420, a lean or rich abnormality may be the cause. Perform troubleshooting by following the inspection procedure for P0171 (System Too Lean) and P0172 (System Too Rich).
2. Sensor 1 refers to the sensor closest to the engine assembly.
3. Sensor 2 refers to the sensor farthest away from the engine assembly.
4. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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 ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0420 is output A DTC P0420 and other DTCs are output B HINT: If any DTCs other than P0420 are output, troubleshoot those DTCs first. B --> See step 17 A: Go to next step
2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up. Run the engine at an engine speed of 2500 rpm for approximately 90 seconds. HINT: During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, warm up the engine after charging control has completed. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / Gas AF Control / AFS Voltage B1S1 and O2S B1S2. Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the 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 12.5%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds. If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning. Standard Techstream Display (Sensor) Injection Volume Status Voltage AFS Voltage B1S1 (Air fuel ratio) 12.5% Rich Below 3.1 V -12.5% Lean Higher than 3.4 V O2S B1S2 (Heated oxygen) 12.5% Rich Higher than 0.55 V -12.5% Lean Below 0.4 V RESULT Status AFS Voltage B1S1 Status O2S B1S2 Actual air fuel ratio, air fuel ratio sensor and heated oxygen sensor condition Misfire Main Suspected Trouble Area Proceed to Lean/Rich Lean/Rich Normal - Three-way catalytic converter Gas leak 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 leak from exhaust system C Lean/Rich Rich Heated oxygen sensor malfunction - Heated oxygen sensor Gas leak from exhaust system Lean Lean Actual air fuel ratio lean May occur Extremely lean actual air fuel ratio Gas leak from exhaust system EGR valve assembly D Rich Rich Actual air fuel ratio rich - Extremely rich actual air fuel ratio Gas leak 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 B1S1) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S B1S2) is consistently below 0.4 V. Rich: During Control the Injection Volume for A/F Sensor, the AFS Voltage B1S1 is consistently below 3.1 V, and the O2S B1S2 is consistently higher than 0.55 V. Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the air fuel ratio sensor and heated oxygen sensor alternate correctly. B --> See step 7 C --> See step 8 D --> See step 10 A: Go to next step
3. CHECK FOR EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks. NG --> See step 14 OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK 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-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 18 OK: Go to next step
6. REPLACE EXHAUST MANIFOLD (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST) NOTE: Replace the exhaust manifold (TWC: Front catalyst) and the front exhaust pipe assembly (TWC: Rear catalyst) together when catalyst replacement is necessary. HINT: Confirm the replacement parts, referring to the illustration in the Catalyst Location. Replace the exhaust manifold (TWC: Front catalyst). Refer to «COMPONENTS»(/toyota/prius-c/i-2011-2015/remont/exhaust/#intake-system-exhaust-system-service-information) . Replace the front exhaust pipe assembly (TWC: Rear catalyst). Refer to «COMPONENTS»(/toyota/prius-c/i-2011-2015/remont/exhaust/#intake-system-exhaust-system-service-information) . NEXT --> END
7. REPLACE AIR FUEL RATIO SENSOR Replace the air fuel ratio sensor. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . HINT: Perform "Inspection After Repair" after replacing the air fuel ratio sensor. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT --> See step 15
8. CHECK FOR EXHAUST GAS LEAK Check for exhaust gas leaks. OK No gas leaks. NG --> See step 14 OK: Go to next step
9. REPLACE HEATED OXYGEN SENSOR Replace the heated oxygen sensor. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . NEXT --> See step 15
10. CHECK FOR EXHAUST GAS LEAK Check the exhaust gas leaks. OK No gas leaks. NG --> See step 14 OK: Go to next step
11. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK B B --> See step 13 A: Go to next step
12. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 18 OK: Go to next step
13. CHECK CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO Check the cause of extremely rich or lean actual air fuel ratio, referring to the DTC P0171 Inspection Procedure. Refer to «INSPECTION PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . NEXT --> See step 15
14. REPAIR OR REPLACE EXHAUST GAS LEAK POINT Repair or replace exhaust gas leak point. HINT: Perform "Inspection After Repair" after repairing or replacing the exhaust system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT: Go to next step
15. CHECK WHETHER DTC OUTPUT RECURS (DTC P0420) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0420 is output A DTC is not output (No pending DTCs output) B B --> END A: Go to next step
16. REPLACE EXHAUST MANIFOLD (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST) NOTE: Replace the exhaust manifold (TWC: Front catalyst) and the front exhaust pipe assembly (TWC: Rear catalyst) together when catalyst replacement is necessary. HINT: Confirm the replacement parts, referring to the illustration in the Catalyst Location. Replace the exhaust manifold (TWC: Front catalyst). Refer to «COMPONENTS»(/toyota/prius-c/i-2011-2015/remont/exhaust/#intake-system-exhaust-system-service-information) . Replace the front exhaust pipe assembly (TWC: Rear catalyst). Refer to «COMPONENTS»(/toyota/prius-c/i-2011-2015/remont/exhaust/#intake-system-exhaust-system-service-information) . NEXT --> END
17. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
18. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)

DTC SUMMARY

HINT

The reference orifice is located inside the canister pump module.

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

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

HINT

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

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

Scheme 176

TEXT IN ILLUSTRATION

The leak detection pump creates negative pressure through the reference orifice (in operation B and E). When the system is normal, the EVAP pressure is between 97 to 100 kPa(abs) [726 to 750 mmHg(abs)]* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM illuminates the MIL and stores a DTC if this malfunction is detected in consecutive drive cycles.

*: Typical value.

Scheme 177

"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa(gauge) [2.145 mmHg(gauge)] in 60 seconds.

Refer to EVAP system. Refer to MONITOR RESULT .

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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
7. After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
8. Input the DTC: P043E, P043F, P2401, P2402 or P2419.
9. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
10. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to EVAP System. Refer to INSPECTION PROCEDURE .

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

The 2 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 ignition switch is turned off. The purge flow monitor runs while the engine is running.

Scheme 178

Scheme 179

Scheme 180

1. KEY-OFF MONITOR 5 hours* after the ignition switch is turned off, the electric leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure. HINT: *: If the engine coolant temperature is not less than 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not less than 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later. Sequence Operation Description Duration - ECM activation Activated by soak timer 5, 7 or 9.5 hours after ignition switch turned off. - A Atmospheric pressure measurement Vent valve is turned off (vent) and EVAP system pressure is measured by ECM in order to register atmospheric pressure. If pressure in EVAP system is not between 70 kPa(abs) and 110 kPa(abs) [525 mmHg(abs) and 825 mmHg(abs)], ECM cancels EVAP system monitor. 60 seconds B First reference pressure measurement In order to determine reference pressure, leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if leak detection pump and vent valve operate normally. 360 seconds C EVAP system pressure measurement Vent valve is turned on (closed) to shut EVAP system. Negative pressure (vacuum) is created in EVAP system, and EVAP system pressure is then measured. Write down measured value as it will be used in leak check. If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor. 15 minutes* D Purge VSV monitor Purge VSV opened and then EVAP system pressure is measured by ECM. A large increase indicates normality. 10 seconds E Second reference pressure measurement After second reference pressure measurement, leak check is performed by comparing first and second reference pressure measurements. If stabilized system pressure is higher than second reference pressure, ECM determines that EVAP system leaking. 60 seconds - Final check Atmospheric pressure is measured and then monitoring result is recorded by ECM. - *: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize. TEXT IN ILLUSTRATION *1 Purge VSV: Off (Closed) *2 Purge VSV: On (Open) *3 Vent Valve: Off (Vent) *4 Vent Valve: On (Closed) *5 Leak Detection Pump: Off *6 Leak Detection Pump: On *7 Reference Orifice (0.02 inch) *8 Canister Pressure Sensor *9 Canister *10 No. 1 Canister *11 Canister Pump Module *12 Canister Filter *13 Fuel Tank - - *a Operation A: Atmospheric Pressure Measurement *b Operation B, E: Reference Pressure Measurement *c Operation C: EVAP System Pressure Measurement *d Operation D: Purge VSV Monitor *e Atmospheric Pressure *f Negative Pressure Purge VSV stuck open In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) 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 being stuck open. The ECM illuminates the MIL and stores the DTC (2 trip detection logic). Purge VSV stuck closed In operation D, the canister pressure sensor measures the EVAP (Evaporative Emission) system pressure. The pressure measurement for the purge VSV monitor begins when the purge VSV is turned on (open) after the EVAP leak check. When the measured pressure indicates an increase of 0.3 kPa(gauge) [2.25 mmHg(gauge)] or higher, the purge VSV is functioning normally. If the pressure does not increase, the ECM interprets this as the purge VSV being stuck closed, illuminates the MIL and stores the DTC (2 trip detection logic).
2. PURGE FLOW MONITOR The purge flow monitor consists of 2 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 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(gauge) [3.751 mmHg(gauge)], the ECM interprets this as the purge VSV being stuck closed, illuminates the MIL and stores DTC P0441 (2 trip detection logic).

Atmospheric pressure check

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

ALL

KEY-OFF MONITOR

PURGE FLOW MONITOR

PURGE VSV STUCK OPEN

PURGE VSV STUCK CLOSED

PURGE FLOW

Refer to EVAP system. Refer to MONITOR RESULT .

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Start the engine and wait 15 minutes or more.
8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
9. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
11. Input the DTC: P0441.
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 You should perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform the following procedure. NOTE: The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes. Do not perform the Evaporative System Check when the fuel tank is higher than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable. Do not run the engine during this operation. When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).
13. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
14. Turn the ignition switch off and wait for at least 30 seconds.
15. Turn the ignition switch to ON (IG) and turn the Techstream on.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
17. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
18. Input the DTC: P0441.
19. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
20. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0441) Connect the Techstream to the DLC3. Turn the ignition switch to 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 HINT: If any DTCs other than DTC P0441 are output, troubleshoot those DTCs first. 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 ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK B B --> See step 5 A: Go to next step
3. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 6 OK --> See step 5
4. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
5. GO TO EVAP SYSTEM. Refer to «EVAP System»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p1604-u0293-circuit-tests)
6. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)

HINT

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

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

Scheme 181

1. DTC P0451: Canister pressure sensor abnormal voltage 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 stores the DTC. (Malfunction is detected by 2 trip detection logic).
2. DTC P0452: Canister pressure sensor voltage low If the canister pressure sensor voltage output (pressure) is less than 0.45 V: 42.11 kPa(abs) [315.867 mmHg(abs)], 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 stores the DTC (1 trip detection logic).
3. DTC P0453: Canister pressure sensor voltage high If the canister pressure sensor voltage output (pressure) is higher than 4.9 V: 123.761 kPa(abs) [928.331 mmHg(abs)], 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 stores the DTC (1 trip detection logic).

P0451

P0452 AND P0453

P0451

P0452

P0453

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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Intake Air.
4. Check that the intake air temperature is between 4.4 and 50°C (40 and 122°F).
5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
6. Turn the ignition switch off and wait for at least 30 seconds.
7. Turn the ignition switch to ON (IG) and turn the Techstream on.
8. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
9. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0451, P0452 or P0453.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 182

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. The Techstream is required to conduct the following diagnostic troubleshooting procedure. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 183

Scheme 184

1. CONFIRM DTC AND EVAP PRESSURE Connect the Techstream to the DLC3. Turn the ignition switch to 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 / Gas Evaporative / Vapor Pressure Pump. Read the EVAP (Evaporative Emission) pressure displayed on the Techstream. RESULT Display (DTC Output) Test Result Suspected Trouble Area Proceed to P0451 - Canister pressure sensor C P0452 Less than 42.11 kPa(abs) [315.867 mmHg(abs)] Wire harness/connector (ECM - canister pressure sensor) Canister pressure sensor Short in ECM circuit A P0453 Higher than 123.761 kPa(abs) [928.331 mmHg(abs)] Wire harness/connector (ECM - canister pressure sensor) Canister pressure sensor Open in ECM circuit B B --> See step 4 C --> See step 9 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) 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 A40-35 (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 B --> See step 7 A: Go to next step
3. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Disconnect the canister pump module 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 A40-35 (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 A --> See step 5 B --> See step 6
4. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Disconnect the canister pump module connector. TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Canister Pump Module) - - Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition M21-8 (SGND) - Body ground Always 100 ohms or less Turn the ignition switch to ON (IG). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition M21-6 (VCC) - Body ground Ignition switch ON (IG) 4.5 to 5.5 V M21-7 (VOUT) - Body ground Ignition switch ON (IG) 4.5 to 5.5 V RESULT Test Result Suspected Trouble Area Proceed to Voltage and resistance within standard ranges Open in canister pressure sensor circuit A Voltage and/or resistance outside standard ranges Open in wire harness/connector (ECM - canister pressure sensor) B B --> See step 6 A: Go to next step
5. REPLACE CANISTER PUMP MODULE Replace the canister pump module. Refer to «REMOVAL - Step 6»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . NOTE: When replacing the canister pump module, check the canister pump module interior, canister interior and No. 1 canister interior 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. If liquids are present in the canister interior or No. 1 canister interior, replace the canister, No. 1 canister and canister pump module together. Check for filter blockage in the canister and No. 1 canister. If the charcoal filter inside the canister or No. 1 canister is clogged, replace the canister, No. 1 canister and canister pump module together. Check for filter blockage in the canister filter. If the canister filter has blockages, replace the canister filter. TEXT IN ILLUSTRATION *1 Fuel Tank Vent Hose *2 Air Inlet Port *3 Vent Hose *4 Fuel Tank *5 Canister Pump Module *6 Canister *7 No. 1 Canister *8 Canister Filter *a Inspection Area (check for disconnection and/or cracks) - - NEXT --> See step 8
6. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER PUMP MODULE - ECM) HINT: If the exhaust pipe has been removed, go to the next step before reinstalling it. NEXT --> See step 8
7. REPLACE ECM Replace the ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . NEXT: Go to next step
8. CHECK WHETHER DTC OUTPUT RECURS (DTC P0451, P0452 OR P0453) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Perform the Evaporative System Check using the Techstream, referring to 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. RESULT Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit NEXT --> END
9. GO TO EVAP SYSTEM. Refer to «EVAP System»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p1604-u0293-circuit-tests)

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

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

HINT

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

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

TEXT IN ILLUSTRATION

Scheme 185

1. (a) P0455: EVAP (Evaporative Emission) 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 leak, illuminates the MIL and stores the DTC (2 trip detection logic).
2. (b) P0456: EVAP very 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 second reference pressure, the ECM determines that the EVAP system has a small leak, illuminates the MIL and stores the DTC (2 trip detection logic).

P0455: EVAP GROSS LEAK

P0456: EVAP SMALL LEAK

Refer to EVAP system. Refer to MONITOR RESULT .

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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
7. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
8. Input the DTC: P0455 or P0456.
9. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
10. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to EVAP System. Refer to INSPECTION PROCEDURE .

The idle speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS is comprised of: 1) the one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position sensor, which detects the accelerator pedal position; and 5) the ECM, which controls the ETCS. 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 idling air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC system is malfunctioning if either of the following conditions is met

Scheme 186

1. The difference between the target engine idle speed and actual engine idle speed exceeds the threshold and the IAC flow rate learned value is stuck at the upper or lower limit for 5 seconds or more.
2. After driving at a vehicle speed of 10 km/h (6.25 mph) or more, the difference between the target and actual engine idle speed exceeds the threshold 5 times or more during a driving cycle, and then the system determines that the IAC flow rate learned value is stuck at the upper or lower limit, or that the IAC flow rate learned value has been changed by an amount that exceeds the threshold.

Scheme 187

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on [A].
6. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
7. Start the engine and warm it up until the coolant temperature reaches 70°C (158°F) or higher with all the accessories switch off [B].
8. Turn the ignition switch off and wait for at least 30 seconds.
9. Disconnect the cable from the negative (-) auxiliary battery terminal.
10. Reconnect the cable to the negative (-) auxiliary battery terminal.
11. Turn the ignition switch to ON (IG) and turn the Techstream on.
12. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
13. Start the engine and rev the engine for 5 seconds with the shift lever in P [C].
14. Idle the engine for 5 minutes or more [D]. HINT: In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.
15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
16. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
18. Input the DTC: P0505.
19. Check the DTC judgment result. HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [F] through [I].
20. Accelerate the vehicle to 10 km/h (6.25 mph) or more [F]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
21. Stop the vehicle and rev the engine for 5 seconds with the shift lever in P [G].
22. Idle the engine for 20 seconds or more [H].
23. Repeat the steps [F] through [H] 10 times.
24. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [I].
25. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
26. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
27. Input the DTC: P0505.
28. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
29. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . 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 stored: 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 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.
3. Refer to "Data List / Active Test" [Engine Speed, ISC Feedback Value and ISC Learning Value]. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) .

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) Connect the Techstream to the DLC3. Turn the ignition switch to 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 8 A: Go to next step
2. CHECK PCV HOSE CONNECTIONS Check the PCV hose connections. Refer to «COMPONENTS»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . OK PCV valve and hose are connected correctly and are not damaged. NG --> REPAIR OR REPLACE PCV HOSE OK: Go to next step
3. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-intake-system-inspection) . OK No leaks from the intake system. HINT: Perform "Inspection After Repair" after repairing or replacing the intake system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> REPAIR OR REPLACE INTAKE SYSTEM OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK 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-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 11 OK: Go to next step
6. INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE) Check the throttle body with motor assembly condition. OK Throttle valve is not contaminated with foreign objects and moves smoothly. HINT: Perform "Inspection After Repair" after replacing the throttle body with motor assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NG --> See step 9 OK: Go to next step
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0505) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0505 is output A DTC is not output B B --> END A --> See step 10
8. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
9. REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
10. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
11. REPLACE EGR VALVE ASSEMBLY. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information)

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 will be stored 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 less than 50°C (122°F), the ECM measures the accumulated mass air flow during engine idling. If the accumulated mass air flow does not reach the specified level within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is stored 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. The idle speed control learned values are cleared by performing a learned value reset. 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 less than 50°C (122°F) before allowing it to continue running for the 5 minutes learning period.

Scheme 188

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Start the engine and warm it up for 5 minutes or more.
6. Stop the engine.
7. Leave the vehicle outside overnight.
8. Turn the ignition switch to ON (IG) and turn the Techstream on [A].
9. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
10. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).
11. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
12. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.
13. Idle the engine for 1 minute or more [B].
14. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
15. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Input the DTC: P050A.
18. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] through [C] again.
19. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0102. Refer to WIRING DIAGRAM .

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

HINT

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can 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 P050A) Connect the Techstream to the DLC3. Turn the ignition switch to 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 27 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 ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas AF Control / 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. Standard Total of Short FT #1 and Long FT #1 values is between -20% and 20%. NG --> See step 7 OK: Go to next step
3. INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE) Check that there are no deposits around the throttle valve and throttle valve condition. OK No deposits around the throttle valve and throttle valve moves smoothly. NG --> See step 6 OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK B B --> See step 20 A: Go to next step
5. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. OK --> See step 20 NG --> See step 17
6. REPAIR OR REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY Repair or replace the throttle body with motor assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . HINT: Perform "Inspection After Repair" after repairing or replacing the throttle body with motor assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT --> See step 19
7. CHECK PCV SYSTEM Check the PCV hose connections. Refer to «COMPONENTS»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . OK PCV valve and hose are connected correctly and are not damaged. NG --> See step 14 OK: Go to next step
8. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-intake-system-inspection) . OK No leaks from the intake system. NG --> See step 15 OK: Go to next step
9. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil. OK The air cleaner filter element is not excessively contaminated with dirt or oil. NG --> See step 16 OK: Go to next step
10. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK B B --> See step 12 A: Go to next step
11. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 17 OK: Go to next step
12. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR) Operate the VVT system through the Active test, and check if the VVT system is operating normally. Perform the Active Test, referring to DTC P0011 Inspection Procedure. Refer to «PROCEDURE - Step 2»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . NG --> See step 18 OK: Go to next step
13. READ VALUE USING TECHSTREAM (MAF). Refer to «PROCEDURE - Step 6»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) OK --> See step 20 NG --> See step 21
14. REPAIR OR REPLACE PCV HOSE Repair or replace the PCV valve or hose. NEXT --> See step 19
15. REPAIR OR REPLACE INTAKE SYSTEM Repair or replace the intake system. HINT: Perform "Inspection After Repair" after repairing or replacing the intake system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT --> See step 19
16. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Replace the air cleaner filter element sub-assembly. NEXT --> See step 19
17. REPLACE EGR VALVE ASSEMBLY Replace the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT --> See step 19
18. CHECK AND REPAIR VVT SYSTEM Check and repair the VVT system. HINT: Refer to DTC P0011 Inspection Procedure. Refer to «INSPECTION PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . NEXT: Go to next step
19. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) NOTE: In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P050A. Check the DTC judgment result. RESULT Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P050A is output) B B --> See step 21 A --> END
20. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) NOTE: In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P050A. Check the DTC judgment result. RESULT Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P050A is output) B B --> See step 21 A --> See step 28
21. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . HINT: Repair any problems. NEXT: Go to next step
22. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A) NOTE: In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P050A. Check the DTC judgment result. RESULT Result Proceed to ABNORMAL (DTC P050A is output) A NORMAL (DTC is not output) B B --> END A: Go to next step
23. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM). Refer to «PROCEDURE - Step 3»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
24. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Replace the mass air flow meter sub-assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . HINT: If the results of the inspections performed in step 13 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly. Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT: Go to next step
25. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED NOTE: In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P050A. Check the DTC judgment result. RESULT Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P050A is output) B B --> See step 26 A --> END
26. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
27. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
28. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)

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 is stored after the engine idles for 13 seconds (2 trip detection logic).

The DTC is designed to monitor the ignition timing at cold start. When the engine is started at an engine coolant temperature of less than 50°C (122°F), the ECM checks the ignition timing during engine idling. If the ignition timing advances beyond the specified level within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is stored when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

Note. The idle speed control learned values are cleared by performing a learned value reset. 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 less than 50°C (122°F) before allowing it to continue running for the 5 minutes learning period.

Scheme 189

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Start the engine and warm it up for 5 minutes or more.
6. Stop the engine.
7. Leave the vehicle outside overnight.
8. Turn the ignition switch to ON (IG) and turn the Techstream on [A].
9. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.
10. Check that "Coolant Temp" in the Data List is within the range of -10 to 50°C (14 to 122°F).
11. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
12. Start the engine and warm it up until the coolant temperature is the same as the coolant temperature in the freeze frame data.
13. Idle the engine for 1 minute or more [B].
14. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
15. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
16. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
17. Input the DTC: P050B.
18. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] through [C] again.
19. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Refer to DTC P0102. Refer to WIRING DIAGRAM .

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

HINT

1. DTC P050B may be output when the engine has the symptoms listed below. If necessary, check the trouble areas listed below. Symptom Factor Trouble Area Low idle speed when engine is cold (immediately after engine start) Excessive engine friction Engine oil deterioration Rough idle when engine is cold (immediately after engine start) 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 ignition switch to ON (IG). Turn the Techstream on. Enter the following 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 26 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 ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas AF Control / 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. Standard Total of Short FT #1 and Long FT #1 values is between -20% and 20%. NG --> See step 7 OK: Go to next step
3. INSPECT THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE) Check that there are no deposits around the throttle valve and throttle valve condition. OK No deposits around the throttle valve and throttle valve moves smoothly. NG --> See step 6 OK: Go to next step
4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK B B --> See step 20 A: Go to next step
5. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. OK --> See step 20 NG --> See step 17
6. REPAIR OR REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY Repair or replace the throttle body with motor assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . HINT: Perform "Inspection After Repair" after repairing or replacing the throttle body with motor assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT --> See step 19
7. CHECK PCV SYSTEM Check the PCV hose connections. Refer to «COMPONENTS»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . OK PCV valve and hose are connected correctly and are not damaged. NG --> See step 14 OK: Go to next step
8. CHECK INTAKE SYSTEM Check the intake system for vacuum leaks. Refer to «ON-VEHICLE INSPECTION»(/toyota/prius-c/i-2011-2015/remont/mechanical/#engine-intake-system-inspection) . OK No leaks from the intake system. NG --> See step 15 OK: Go to next step
9. CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil. OK The air cleaner filter element is not excessively contaminated with dirt or oil. NG --> See step 16 OK: Go to next step
10. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher. HINT: The A/C switch and all accessory switches should be off. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP. Confirm that 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 (Throttle Idle Position: ON) Steady idling Idling changes from steady to rough idling or engine stalls MAP (Data List) MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)] (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 NG A OK B B --> See step 12 A: Go to next step
11. INSPECT EGR VALVE ASSEMBLY Remove the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . Check if the EGR valve is stuck open. OK EGR valve is tightly closed. NG --> See step 17 OK: Go to next step
12. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT LINEAR) Operate the VVT system through the Active test, and check if the VVT system is operating normally. Perform the Active Test, referring to DTC P0011 Inspection Procedure. Refer to «PROCEDURE - Step 2»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . NG --> See step 18 OK: Go to next step
13. READ VALUE USING TECHSTREAM (MAF). Refer to «PROCEDURE - Step 6»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) OK --> See step 20 NG --> See step 21
14. REPAIR OR REPLACE PCV HOSE Repair or replace the PCV valve or hose. NEXT --> See step 19
15. REPAIR OR REPLACE INTAKE SYSTEM Repair or replace the intake system. HINT: Perform "Inspection After Repair" after repairing or replacing the intake system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT --> See step 19
16. REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY Replace the air cleaner filter element sub-assembly. NEXT --> See step 19
17. REPLACE EGR VALVE ASSEMBLY Replace the EGR valve assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . HINT: Perform "Inspection After Repair" after replacing the EGR valve assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT --> See step 19
18. CHECK AND REPAIR VVT SYSTEM Check and repair the VVT system. HINT: Refer to DTC P0011 Inspection Procedure. Refer to «INSPECTION PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NEXT: Go to next step
19. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B) NOTE: In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P050B. Check the DTC judgment result. RESULT Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P050B is output) B B --> See step 21 A --> END
20. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B) NOTE: In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P050B. Check the DTC judgment result. RESULT Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P050B is output) B B --> See step 21 A --> See step 27
21. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM. Refer to «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . HINT: Repair any problems. NEXT: Go to next step
22. CHECK WHETHER DTC OUTPUT RECURS (DTC P050B) NOTE: In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P050B. Check the DTC judgment result. RESULT Result Proceed to ABNORMAL (DTC P050B is output) A NORMAL (DTC is not output) B B --> END A: Go to next step
23. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM). Refer to «PROCEDURE - Step 3»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
24. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Replace the mass air flow meter sub-assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information) . HINT: If the results of the inspections performed in step 13 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly. Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT: Go to next step
25. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED NOTE: In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the freeze frame data). Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp. Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F). Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the freeze frame data. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness. Input the DTC: P050B. Check the DTC judgment result. RESULT Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P050B is output) B B --> See step 28 A --> END
26. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)
27. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
28. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

The auxiliary battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the auxiliary 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. When the engine is next started, the ECM illuminates the MIL and stores the DTC.

HINT

If DTC P0560 is stored, the ECM does not store other DTCs or the data stored in the ECM is partially cleared.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Wait 5 seconds or more.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0560.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Scheme 190

Note. Inspect the fuses for circuits related to this system before performing the following inspection procedure. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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 191

1. INSPECT AUXILIARY BATTERY Inspect that the auxiliary battery is not depleted. Refer to «ON-VEHICLE INSPECTION - Step 1»(/toyota/prius-c/i-2011-2015/remont/charging-system/#charging-system-inspection) . OK Auxiliary battery is not depleted NG --> REPLACE AUXILIARY BATTERY OK: Go to next step
2. CHECK AUXILIARY BATTERY TERMINAL Check that the auxiliary battery terminals are not loose or corroded. OK Auxiliary battery terminals are not loose or corroded NG --> REPAIR OR REPLACE AUXILIARY BATTERY TERMINAL OK: Go to next step
3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM) Disconnect the ECM connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition A40-1 (BATT) - Body ground Ignition switch off 11 to 16 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to ECM) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - ECM) OK: Go to next step
4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0560) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON (IG). Turn the Techstream on. Wait 5 seconds or more. 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 6 A --> See step 5
5. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
6. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)

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 standard, the ECM illuminates the MIL and stores the DTC immediately.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the Techstream off.
5. Turn the ignition switch off.
6. Disconnect the Techstream.
7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
8. Connect the cable to the negative (-) auxiliary battery terminal.
9. Connect the Techstream to the DLC3.
10. Turn the ignition switch to ON (IG) and turn the Techstream on.
11. Wait 16 seconds or more.
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
13. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P0604.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
17. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Note. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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. READ OUTPUT DTC (DTC P0604) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTC. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute. Connect the cable to the negative (-) auxiliary battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Wait 16 seconds or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC 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-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

The ECM continuously monitors its main and sub CPUs. This self-check ensures that the ECM is functioning properly. If outputs from these CPUs are different and deviate from the standard, the ECM illuminates the MIL and stores the DTC immediately.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the Techstream off.
5. Turn the ignition switch off.
6. Disconnect the Techstream.
7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
8. Connect the cable to the negative (-) auxiliary battery terminal.
9. Connect the Techstream to the DLC3.
10. Turn the ignition switch to ON (IG) and turn the Techstream on.
11. Wait 1 second or more.
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
13. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P0606.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
17. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Note. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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. READ OUTPUT DTC (DTC P0606) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute. Connect the cable to the negative (-) auxiliary battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Wait 1 second or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC 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-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

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

Scheme 192

1. Stop the engine for 30 minutes or more [A].
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON (IG) and turn the Techstream on [B].
4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
5. Turn the ignition switch off and wait for at least 30 seconds.
6. Turn the ignition switch to ON (IG) and turn the Techstream on [C].
7. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
8. Start the engine and wait 2 minutes [D].
9. Warm up the engine until the engine coolant temperature is 75°C (167°F) or higher [E].
10. Idle the engine for 1 minute [F].
11. Accelerate the vehicle to 80 km/h (50 mph) and stop the vehicle [G]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
12. Drive the vehicle at 56 to 80 km/h (35 to 50 mph) for 5 minutes or more [H]. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws.
13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [I].
14. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Input the DTC: P0607, P0136, P0137 or P0138.
17. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [E] through [I] again.
18. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

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

Scheme 193

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0607) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0607 and P0136, P0137 or P0138 are output A DTC P0607 is output B B --> See step 3 A: Go to next step
2. INSPECT DTC (DTC P0136, P0137 OR P0138) Refer to the P0136, P0137 or P0138 flowchart. HINT: If P0136 is output, troubleshoot for that DTC first. Refer to «DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . Then proceed to "Inspect ECM". If P0137 is output, troubleshoot for that DTC first. Refer to «DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . Then proceed to "Inspect ECM". If P0138 is output, troubleshoot for that DTC first. Refer to «DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . 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 higher). NEXT --> See step 6
3. CHECK FOR EXHAUST GAS LEAK Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Allow the engine to idle, and then 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 "Perform Confirmation Driving Pattern". If no exhaust gas leaks are present, proceed to "Perform Confirmation Driving Pattern". HINT: If no exhaust gas leaks are present, there may be a malfunction in the heated oxygen sensor circuit. If any exhaust gas leaks are present around the heated oxygen sensor, noise appears in the output voltage of the heated oxygen sensor. Perform "Inspection After Repair" after repairing or replacing the exhaust system. Refer to «INITIALIZATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . NEXT: Go to next step
4. PERFORM CONFIRMATION DRIVING PATTERN Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Warm up the engine until the engine coolant temperature is 75°C (167°F) or higher. Perform the driving pattern. WARNING: When performing the confirmation driving pattern, obey all speed limits and traffic laws. Accelerate the vehicle to 80 km/h (50 mph) and stop the vehicle. Drive the vehicle between 60 and 80 km/h (37 and 50 mph) for 5 minutes. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0136, P0137, P0138 and/or P0607 are output A Only P0607 is output B DTC is not output C B --> See step 7 C --> See step 6 A: Go to next step
5. INSPECT DTC (DTC P0136, P0137 OR P0138) Refer to the P0136, P0137 or P0138 flowchart. HINT: If P0136 is output, troubleshoot for that DTC first. Refer to «DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . Then proceed to "Inspect ECM". If P0137 is output, troubleshoot for that DTC first. Refer to «DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . Then proceed to "Inspect ECM". If P0138 is output, troubleshoot for that DTC first. Refer to «DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0137: Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2); DTC P0138: Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2); DTC P0139: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0010-p0171) . 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 higher). NEXT: Go to next step
6. INSPECT ECM Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Stop the engine and wait for 30 minutes. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and allow it to idle for 2 minutes. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P0607 is output B B --> See step 8 A --> END
7. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
8. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

The main CPU and sub CPU of the ECM perform data communication between each other. The main CPU monitors the communications and WDC pulses from the sub CPU. When the signal malfunctions below are detected, the DTC is stored.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the Techstream off.
5. Turn the ignition switch off.
6. Disconnect the Techstream.
7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
8. Connect the cable to the negative (-) auxiliary battery terminal.
9. Connect the Techstream to the DLC3.
10. Turn the ignition switch to ON (IG) and turn the Techstream on.
11. Wait 16 seconds or more.
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
13. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P060A.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
17. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Note. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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. READ OUTPUT DTC (DTC P060A) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute. Connect the cable to the negative (-) auxiliary battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Wait 16 seconds or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC 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-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

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

CASE 1 AND CASE 2

CASE 3

CASE 1

CASE 2

CASE 3

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the Techstream off.
5. Turn the ignition switch off.
6. Disconnect the Techstream.
7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
8. Connect the cable to the negative (-) auxiliary battery terminal.
9. Connect the Techstream to the DLC3.
10. Turn the ignition switch to ON (IG) and turn the Techstream on.
11. Wait 16 seconds or more.
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
13. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P060B.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
17. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Note. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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. READ OUTPUT DTC (DTC P060B) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute. Connect the cable to the negative (-) auxiliary battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Wait 16 seconds or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P060B is output B DTC P060B and P0327, P0328 are output C B --> See step 3 C --> See step 4 A --> See step 2
2. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
4. GO TO DTC P0327, 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-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostic-codes-p0300-p0657)

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

CASE 1

CASE 2

CASE 1

CASE 2

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the Techstream off.
5. Turn the ignition switch off.
6. Disconnect the Techstream.
7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
8. Connect the cable to the negative (-) auxiliary battery terminal.
9. Connect the Techstream to the DLC3.
10. Turn the ignition switch to ON (IG) and turn the Techstream on.
11. Wait 16 seconds or more.
12. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
13. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
14. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P060E.
16. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
17. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Note. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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. READ OUTPUT DTC (DTC P060E) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute. Connect the cable to the negative (-) auxiliary battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Wait 16 seconds or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC 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-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

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.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the Techstream off.
5. Turn the ignition switch off.
6. Disconnect the Techstream.
7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
8. Connect the cable to the negative (-) auxiliary battery terminal.
9. Connect the Techstream to the DLC3.
10. Turn the ignition switch to ON (IG) and turn the Techstream on.
11. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) .
12. Start the engine and wait 30 seconds or more.
13. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
14. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
15. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
16. Input the DTC: P062F.
17. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
18. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Note. There is a possibility that the DTC P062F is issued from the ECUs of the ECM and power management control ECU. Use Techstream to conduct a health check to confirm which ECU the DTC is issued from and then inspect the related system. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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. READ OUTPUT DTC (DTC P062F) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off and turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute. Connect the cable to the negative (-) auxiliary battery terminal. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine and wait 30 seconds or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC P062F is output B B --> See step 2 A --> See step 3
2. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)
3. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)

DTC P0630 is stored when the Vehicle Identification Number (VIN) is not stored in the Engine Control Module (ECM) or the input VIN is not accurate.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Wait 5 seconds or more.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0630.
11. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

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

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0630) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P0630 is output A DTC P0630 and other DTCs are output B NOTE: If P0630 is stored, the VIN must be input to the ECM using the Techstream. However, all DTCs are cleared automatically by the Techstream when the VIN is input. If DTCs other than P0630 are output, troubleshoot them first. HINT: If any DTCs other than P0630 are output, troubleshoot those DTCs first. B --> See step 3 A: Go to next step
2. INPUT VIN Input the VIN. Refer to «REGISTRATION»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__registration) . NEXT --> END
3. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)

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 ignition switch is turned off. If the output voltage is higher than 7 V when the ignition switch is turned off, the ECM illuminates the MIL and stores the DTC when the ignition switch is turned to ON (IG).

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the Techstream off.
5. Turn the ignition switch off.
6. Disconnect the Techstream.
7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
8. Connect the cable to the negative (-) auxiliary battery terminal.
9. Turn the ignition switch to ON (IG).
10. Wait 10 seconds or more.
11. Turn the ignition switch off.
12. Wait 15 seconds or more.
13. Connect the Techstream to the DLC3.
14. Turn the ignition switch to ON (IG) and turn the Techstream on.
15. Wait 5 seconds or more.
16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
17. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
18. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
19. Input the DTC: P0657.
20. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction.
21. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

Note. After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work. Refer to PRECAUTION .

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. READ OUTPUT DTC (DTC P0657) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Turn the ignition switch off. Turn the Techstream off. Disconnect the Techstream. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute. Connect the cable to the negative (-) auxiliary battery terminal. Turn the ignition switch to ON (IG). Wait 10 seconds or more. Turn the ignition switch off. Wait 15 seconds or more. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Wait 5 seconds or more. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC is not output A DTC 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-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__check-for-intermittent-problems)
3. REPLACE ECM. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/engine-control-systems/#engine-control-system-service-information)

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 50 minutes after the ignition 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 4000 m (13124 ft) or higher.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) [A].
5. Start the engine and idle for 10 seconds.
6. Turn the ignition switch off.
7. Leave the ignition switch off for 55 minutes [B].
8. Turn the ignition switch to ON (IG) and turn the Techstream on.
9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
10. Read the pending DTCs. HINT: If a pending DTC is output, the system is malfunctioning. If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
12. Input the DTC: P106A.
13. Check the DTC judgment result. Techstream Display Description NORMAL DTC judgment completed System normal ABNORMAL DTC judgment completed System abnormal INCOMPLETE DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions N/A Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit HINT: If the judgment result shows NORMAL, the system is normal. If the judgment result shows ABNORMAL, the system has a malfunction. If the judgment result shows INCOMPLETE or N/A, perform steps [A] through [C] again.
14. If no pending DTC is output, perform a universal trip and check for permanent DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . HINT: If a permanent DTC is output, the system is malfunctioning. If no permanent DTC is output, the system is normal.

HINT

1. Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
2. Refer to "Data List / Active Test" [Vapor Pressure Pump and MAP]. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) .

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P106A) Connect the Techstream to the DLC3. Turn the ignition switch to 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 ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / 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(abs) [758 mmHg(abs)]. For every 100 m (328 ft) increase in altitude, pressure drops by 1 kPa (7.5 mmHg). The pressure also varies due to the weather (high atmospheric pressure, low atmospheric pressure). Also, check "Atmosphere Pressure" in the Data List. 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 [26.254 mmHg] or higher A If the MAP value differs from the atmospheric pressure by 3.5 kPa [26.254 mmHg] or higher B B --> See step 4 A: Go to next step
3. REPLACE CANISTER PUMP MODULE Replace the canister pump module. Refer to «REMOVAL - Step 6»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . NEXT --> See step 5
4. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR Replace the manifold absolute pressure sensor. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/auxiliary-emission-control-systems/#emission-control-system-service-information) . NEXT: Go to next step
5. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG) and the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Vapor Pressure Pump and MAP. 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-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)

The ECM controls the engine water pump assembly by calculating the necessary amount of coolant flow based on engine coolant temperature, engine speed and vehicle speed information. The speed of the engine water pump assembly is controlled steplessly using a duty cycle signal sent from the ECM. This optimal control enhances warm-up performance and reduces cooling losses, thus reducing the specific fuel consumption of the engine. The ECM monitors the speed of the engine water pump assembly and stores a DTC when it determines that the engine water pump assembly rotates excessively based on the fact that the actual speed is higher than the target for a certain amount of time. (However, the MIL will not illuminate.)

HINT

1. DTC P148F may be stored if the engine has continuously run with insufficient engine coolant. If the engine coolant is sufficient and DTC P148F recur when the vehicle is brought to the workshop, confirm whether engine coolant was added after the vehicle had been driven with insufficient engine coolant.
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 P148F) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes. Read the DTCs. RESULT Result Proceed to DTC P148F is output A DTC P148F and other DTCs are output B HINT: If any DTCs other than P148F are output, troubleshoot those DTCs first. B --> See step 11 A: Go to next step
2. CHECK RADIATOR RESERVOIR TANK ASSEMBLY (ENGINE COOLANT LEVEL) Check that the engine coolant level is between the FULL and LOW lines. Refer to «ON-VEHICLE INSPECTION - Step 2»(/toyota/prius-c/i-2011-2015/remont/cooling-fan/#engine-cooling-system-inspection) . RESULT Result Proceed to Engine coolant level is below the LOW line A Engine coolant level is above the LOW line B B --> See step 6 A: Go to next step
3. CHECK FOR ENGINE COOLANT LEAKS Check the areas around the engine and heater for engine coolant leaks. Refer to «REPLACEMENT - Step 3»(/toyota/prius-c/i-2011-2015/remont/cooling-fan/#engine-cooling-system-service-information) . OK No leaks. HINT: If the engine oil is cloudy during the engine oil level gauge check, it means that engine coolant has entered the engine lubrication system. NG --> See step 5 OK: Go to next step
4. ADD ENGINE COOLANT Fill the reservoir tank up to the FULL line with engine coolant. NOTE: Make sure not to add engine coolant when the engine is hot. NEXT --> See step 6
5. REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA Repair any engine coolant leaks. HINT: Add engine coolant and perform air bleeding after repair. Refer to «REPLACEMENT - Step 2»(/toyota/prius-c/i-2011-2015/remont/cooling-fan/#engine-cooling-system-service-information) . NEXT: Go to next step
6. CLEAR DTC (DTC P148F) Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTC. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . NEXT: Go to next step
7. INSPECT ENGINE WATER PUMP ASSEMBLY HINT: Perform repair indoors or in a workshop. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp and Elec Water Pump Spd. HINT: Display the Data List diagram. Idle the engine for about 20 minutes and check Coolant Temp, Elec Water Pump Spd using the Techstream, and check the cooling fans. RESULT Result Proceed to One of the following conditions is met: The engine coolant temperature becomes 95°C (203°F) or higher and the engine water pump assembly performs intermittent operation (5 seconds pause after 25 seconds operation). The engine water pump assembly does not start operating even after the engine coolant temperature becomes 95°C (203°F) or higher.*1, *2 The ECM voltage is 15 V or less, and the Data List item Elec Water Pump Spd reaches 6375 rpm. A The cooling fans start operating after the engine coolant temperature becomes 95°C (203°F) or less and decrease in the engine coolant temperature is observed.*3 B HINT: *1: Be careful when the cooling fans do not start operating even after the engine coolant temperature becomes 95°C (203°F) or higher because the engine coolant temperature increases rapidly. (Make sure to stop the engine if the engine coolant temperature becomes 105°C (221°F) or higher.) *2: If the ECM voltage is 14 V or higher and the engine water pump assembly is run excessively due to insufficient coolant etc., the water pump motor speed will exceed 5000 rpm. Enter the following menus to check the voltage of the ECM: Powertrain / Engine and ECT / Data List / Primary / Battery Voltage. Refer to «DATA LIST / ACTIVE TEST»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction) . *3: When the engine is warmed up, the cooling fans operate and the engine coolant temperature will decrease. After the cooling fans begin operating, the engine coolant temperature will stabilize between 88 to 95°C (190 to 203°F). B --> END A: Go to next step
8. REPLACE ENGINE WATER PUMP ASSEMBLY Replace the engine water pump assembly. Refer to «REMOVAL»(/toyota/prius-c/i-2011-2015/remont/cooling-fan/#engine-cooling-system-service-information) . NEXT: Go to next step
9. ADD ENGINE COOLANT Fill the reservoir tank up to the FULL line with engine coolant. NOTE: Make sure not to add engine coolant when the engine is hot. NEXT: Go to next step
10. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED HINT: Perform repair indoors or in a workshop. Connect the Techstream to the DLC3. Turn the ignition switch to ON (IG). Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__dtc-check-clear) . Put the engine in inspection mode (maintenance mode). Refer to «INSPECTION MODE PROCEDURE»(/toyota/prius-c/i-2011-2015/remont/hoistjack/#introduction) . Start the engine. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp and Elec Water Pump Spd. Idle the engine for about 20 minutes and check Coolant Temp, Elec Water Pump Spd using the Techstream, and check the cooling fans. Result The cooling fans start operating after the engine coolant temperature becomes 95°C (203°F) or less and decrease in the engine coolant temperature is observed. NEXT --> END
11. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/toyota/prius-c/i-2011-2015/remont/testing-diagnostics/#engine-control-system-diagnostics-introduction__diagnostic-trouble-code-chart)

See also:
• CHECKING MONITOR STATUS
• INSPECTION MODE PROCEDURE
• CHECK MODE PROCEDURE
• WIRING DIAGRAM
• WIRING DIAGRAM
• COMPONENTS
• ON-VEHICLE INSPECTION - Step 3
• INITIALIZATION
• ON-VEHICLE INSPECTION - Step 8
• INSPECTION
• ON-VEHICLE INSPECTION
• ON-VEHICLE INSPECTION - Step 2
• DTC CHECK / CLEAR
• REMOVAL
• DIAGNOSTIC TROUBLE CODE CHART
• REMOVAL
• CHECK FOR INTERMITTENT PROBLEMS
• REMOVAL
• COMPONENTS
• ON-VEHICLE INSPECTION - Step 1
• REGISTRATION
• ON-VEHICLE INSPECTION - Step 2
• REPLACEMENT - Step 3
• DESCRIPTION