Engine Control System (Diagnostic Codes (P0420-P0657)): Diagnosis Scion tC II рестайлинг

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 204

1. (a) Connect the Techstream to the DLC3.
2. (b) Start the engine and warm it up with all the accessories switched off until the engine coolant temperature stabilizes.
3. (c) Run the engine at an engine speed of between 2500 rpm and 3000 rpm for at least 3 minutes.
4. (d) While running the engine at 3000 rpm for 2 seconds, and then 2000 rpm for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream.

HINT

1. If the voltage output of either 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 (TWC) has deteriorated, the heated oxygen sensor (located behind the Three-way Catalytic Converter (TWC)) voltage output fluctuates up and down frequently, even under normal driving conditions (active air-fuel ratio control is not performed).

RESULT OF REAL-VEHICLE CHECK

Scheme 205

INSPECTION PROCEDURE

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. After performing repairs, drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern and check if DTC P0420 is output again. If a DTC is output again, replace the catalyst if it has not been replaced already.
3. Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
4. Sensor 1 refers to the sensor closest to the engine assembly.
5. Sensor 2 refers to the sensor farthest away from the engine assembly.

DTC SUMMARY

HINT

The reference orifice (0.02 inch orifice) is located inside the canister pump module.

Refer to EVAP System. Refer to INSPECTION PROCEDURE .

HINT

The reference orifice (0.02 inch orifice) is located inside the canister pump module.

Refer to EVAP System. Refer to INSPECTION PROCEDURE .

Refer to EVAP System. Refer to INSPECTION PROCEDURE .

Refer to EVAP System. Refer to INSPECTION PROCEDURE .

HINT

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

Note. When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel cap. Do not disassemble the canister pump module. The Techstream is required to conduct the following diagnostic troubleshooting procedure. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Scheme 206

1. CONFIRM DTC AND EVAP PRESSURE Connect the Techstream to the DLC3. Turn the ignition switch to ON (do not start the engine). Turn the Techstream on. Enter the following menus: Powertrain / Engine / Trouble Codes. Read DTCs. Enter the following menus: Powertrain / Engine / Data List / 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 Below 42.11 kPa(abs) [315.85 mmHg(abs)] Wire harness/connector (ECM - Canister pressure sensor) Canister pressure sensor Short in ECM circuit A P0453 Higher than 123.761 kPa(abs) [928.28 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) Turn the ignition switch off. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. RESULT Tester Connection Condition Specified Condition Suspected Trouble Area Proceed to B30-114 (PPMP) - Body ground Always Below 10 ohms Wire harness/connector (ECM - Canister pressure sensor) Short in canister pressure sensor circuit A 10 kohms or higher Wire harness/connector (ECM - Canister pressure sensor) Short in ECM circuit B 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 B30-114 (PPMP) - Body ground Always 10 kohms or higher Short in canister pressure sensor circuit A Below 10 ohms Short in wire harness/connector (ECM - Canister pressure sensor) B A --> See step 5 B --> See step 6
4. CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - ECM) Disconnect the canister pump module connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition H20-8 (SGND) - Body ground Always 100 ohms or less Turn the ignition switch to ON. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Switch Condition Specified Condition H20-6 (VCC) - Body ground Ignition switch ON 4.5 to 5.5 V H20-7 (VOUT) - Body ground Ignition switch ON 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 TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Canister Pump Module) B --> See step 6 A: Go to next step
5. REPLACE CANISTER Replace the canister. Refer to «REMOVAL [05/2013 - ]»(ref-615251-S01365067382014050900000) . NOTE: When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. 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 Vent Hose *3 Air Inlet Port *4 Fuel Tank *5 Canister - - *a Inspection Area (check for disconnection and/or cracks) - - NEXT --> See step 8
6. REPAIR OR REPLACE HARNESS OR CONNECTOR (CANISTER - ECM) HINT: If the exhaust tailpipe has been removed, go to the next step before reinstalling it. NEXT --> See step 8
7. REPLACE ECM Replace the ECM. Refer to «REMOVAL [05/2013 - 01/2014]»(ref-615228-S17169059992014050900000) . NEXT --> See step 8
8. CHECK WHETHER DTC OUTPUT RECURS (AFTER REPAIR) Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Clear the DTCs. Refer to «DTC CHECK / CLEAR [05/2013 - 01/2014]»(ref-615120-S02653872462014050900000) . Turn the ignition switch off and wait for at least 30 seconds. Turn the ignition switch to ON. Turn the Techstream on. Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern. Enter the following menus: Powertrain / Engine / 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»(ref-615235-S01496550502014050900000)

HINT

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

Note. When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel cap. Do not disassemble the canister pump module. The Techstream is required to conduct the following diagnostic troubleshooting procedure. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Refer to EVAP System. Refer to INSPECTION PROCEDURE .

Refer to EVAP System. Refer to INSPECTION PROCEDURE .

HINT

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

HINT

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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

HINT

1. Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
2. Stop light switch conditions can be checked using the Techstream. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Powertrain / Engine / Data List / All Data / Stop Light Switch and ST1. Check the Data List indication when the brake pedal is depressed and released.

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. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
3. Refer to "Data List / Active Test" [Engine Speed]. Refer to «DATA LIST / ACTIVE TEST [05/2013 - 01/2014]»(ref-615234-S35938653532014050900000) .

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. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
3. Refer to "Data List / Active Test" [Engine Speed]. Refer to «DATA LIST / ACTIVE TEST [01/2014 - ]»(ref-615234-S30683406662014050900000) .

HINT

1. DTC P050B may be stored 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 Drive belt tension A/C compressor Generator 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 be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

HINT

1. DTC P050B may be stored 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 Drive belt tension A/C compressor Generator 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 be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

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

HINT

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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

HINT

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

HINT

1. The following troubleshooting flowchart is based on the premise that the engine can be cranked normally. If the engine does not crank, proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [05/2013 - 01/2014]»(ref-615120-S16624443392014050900000) .
2. Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

HINT

1. The following troubleshooting flowchart is based on the premise that the engine can be cranked normally. If the engine does not crank, proceed to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [01/2014 - ]»(ref-615120-S32832496182014050900000) .
2. Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Note. There is a possibility that the DTC P062F is issued from the ECUs of the ECM and TCM. Use Techstream to conduct a health check to confirm which ECU the DTC is issued from and then inspect the related system.

Note. There is a possibility that the DTC P062F is issued from the ECUs of the ECM and TCM. Use Techstream to conduct a health check to confirm which ECU the DTC is issued from and then inspect the related system.