Toyota Yaris: Sfi System / Pre-ignition Detected (P137800)

HINT:

• When this DTC is stored, the ECM enters fail-safe mode.
• During fail-safe mode, the ECM limits the output.
• Fail-safe mode continues until the ECM clears the DTC.

HINT:

• As strong knocking due to pre-ignition may be caused by multiple superimposed factors, it is important to comprehensively investigate all possible causes.
• The risk of this occurring is increased if driving up a steep incline while towing when fixed in low gear, as low-speed, high-output operation occurs.

HINT:

• Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
• If the customer reports a knocking sound or drivability problems, check the "Consecutive Prevention Cylinder #1 History 1 to Consecutive Prevention Cylinder #3 History 4" items in the Data List.
• Explain to the customer that this is normal control to prevent pre-ignition (protect the engine) if the (distance traveled recorded in the appropriate Data List subtracted from the distance traveled in the "Distance for Control" item in the Data List) matches the (distance traveled indicated by the customer subtracted from the current distance traveled).

HINT:

• Check the freeze frame data sets recorded the moment the DTC was stored and after the DTC was stored.
• Using the freeze frame data, confirm the vehicle conditions when the DTC was stored, such as if the engine was idling with the shift state neutral or if the vehicle was being driven at a constant speed or accelerating.

HINT:

• If values are displayed for multiple consecutive prevention cylinder histories of a specific cylinder, check the value of freeze frame data items Misfire Count Cylinder #1 through #6. If the misfire count of that cylinder is high, the cylinder is malfunctioning.
• If the vehicle conditions when the DTC was stored cannot be reproduced, read the value of freeze frame data items Misfire Count Cylinder #1 through #6 to determine if only a specific cylinder or all cylinders are malfunctioning.

HINT:

• Interchange the ignition coil assembly and spark plug of the malfunctioning cylinder with those of a known good cylinder and according to the freeze frame data, check if the malfunctioning cylinder returns to normal.
• Read the Data List items Misfire Count Cylinder #1 to #6 while performing this procedure to determine which cylinder is malfunctioning.

HINT:

• If the vehicle conditions when the DTC was stored cannot be reproduced, read the value of freeze frame data items Short FT Bank 1 and Long FT Bank 1 to perform judgment.
• "Total FT Bank 1" is used to detect an abnormal air fuel ratio. As the value of "Total FT Bank 1" is corrected by the ECM before it is displayed in the Data List, the displayed value may not be equal to the sum of the measured "Short FT B1S1" and "Long FT B1S1".
• An abnormally lean or rich tendency can be checked by reading the following Data List items: A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1, A/F Learn Value High Bank 1, A/F Learn Value Idle (Port) Bank 1, A/F Learn Value Low (Port) Bank 1, A/F Learn Value Mid No.1 (Port) Bank 1, A/F Learn Value Mid No.2 (Port) Bank 1 and A/F Learn Value High (Port) Bank 1.
• The following may cause a lean air fuel ratio (an operating range in which the air fuel ratio learned value correction is +20% or more):
  1. Decrease in fuel injector assembly injection volume
  2. Decrease in mass air flow meter sub-assembly output (due to existence of foreign matter)
  3. Air leaks in intake system after mass air flow meter sub-assembly
  4. Decrease in fuel pressure (at fuel filter, fuel pump, fuel main valve assembly or fuel suction plate sub-assembly)
• On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value High Bank 1" or "A/F Learn Value High (Port) Bank 1" only is corrected to the positive side, a malfunction in the fuel system (clogging of the fuel pump or fuel filter) is suspected.
• On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value Idle Bank 1", "A/F Learn Value Low Bank 1" or "A/F Learn Value Low (Port) Bank 1" only is corrected to the positive side, an air leak after the mass air flow meter sub-assembly is suspected.
• The following may cause a rich air fuel ratio (an operating range in which the air fuel ratio learned value correction is -20% or less):
  1. Increase in the fuel injector assembly injection volume
  2. Purge VSV system

HINT:

• Strong knocking due to pre-ignition may be due to ignition of atomized engine oil under certain conditions.
• The risk of this occurring may be increased if the engine oil used is not the specified oil grade.
• The risk of this occurring may be increased if engine oil additives have been used.
• As strong knocking due to pre-ignition may be caused by multiple superimposed factors, even if the engine oil inspection result is NG, perform the following inspections after replacing the engine oil.

• If the fuel smells like a mixture of gasoline and diesel fuel, etc.
• If there is a possibility that diesel fuel may have be added by mistake.
• If the malfunction started after refueling at an unfamiliar gas station.
• If fuel additives have been used.

HINT:

• Strong knocking due to pre-ignition may be caused by the type fuel used.
• The risk of pre-ignition occurring may be increased depending on the ingredients of fuel additives used.
• Even if no abnormalities are found in this inspection, if a malfunction occurs after the vehicle has been refueled, a problem with the fuel is suspected.

HINT:

• If there is foreign matter in the intake system components, remove it before proceeding to the next step.
• If there is no foreign matter in the intake system components, check for foreign matter in the mass air flow meter sub-assembly. If there is foreign matter in the mass air flow meter sub-assembly, remove it.

NOTICE:

• The air fuel ratio sensor (sensor 1) has an output delay of a few seconds and the air fuel ratio sensor (sensor 2) has a maximum output delay of approximately 20 seconds.
• Read the output value immediately after warming up the air fuel ratio sensor(sensor 1) and air fuel ratio sensor (sensor 2) to avoid an inaccurate reading due to a sensor cooling.

HINT:

• Increase and decrease the fuel injection volume of the port injection and direct injection simultaneously and check the vehicle condition.
• 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%.

HINT:

• If there is foreign matter such as iron particles on the fuel pump (for low pressure side), remove it.
• Make sure that there are no leaks from the fuel lines, signs of fuel leakage or fuel odors.
• If the air fuel ratio becomes lean only when the engine is running under a high load and at a high engine speed, clogging of the fuel filter is suspected.

• Deposits in the intake manifold or on an intake valve
• Delay in fuel supply due to adherence of the fuel to the deposits

• Fuel suction plate sub-assembly
• Fuel main valve assembly
• Fuel lines and connecting parts
• Fuel filter

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