DESCRIPTION
If sudden early ignition (pre-ignition) occurs continuously in a short period of time, a DTC is stored. This pre-ignition is a phenomenon inherent in boosted engines. Atomized engine oil and detached deposits (carbon) cause ignition and promote knocking during low-speed, high-output operation. This is higher pressure knocking than normal knocking.
Pre-ignition is detected by the knock control sensor.
When pre-ignition occurs, the ECM limits output to suppress the pre-ignition. If pre-ignition occurs continuously, the fuel may be cut in some conditions, which may cause vehicle behavior that seems similar to hesitation or shift shock. This is normal engine control and not a malfunction.
As pre-ignition cannot be detected if a knock control sensor malfunction occurs, the same fail-safe control occurs as for strong knock detection.
HINT:
DTC No. | Detection Item | DTC Detection Condition | MIL | Note |
---|---|---|---|---|
P137800 | Pre-ignition Detected | 2 or more continuous pre-ignition prevention fuel-cut control operations (1 trip detection logic). Continuous pre-ignition prevention fuel cut control: Sudden early ignition (pre-ignition) occurs 5 times or more continuously in a short period of time. | - | SAE: P1378 |
Trouble Area | |
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Ignition system |
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Fuel injection system |
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Lubrication system |
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Fuel system |
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Engine related |
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Intake system |
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Exhaust system |
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HINT:
CAUTION / NOTICE / HINT
HINT:
PROCEDURE
1. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P137800) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes Result | Proceed to |
---|---|
P137800 is output | A |
P137800 and other DTCs are output | B |
HINT:
If any DTCs other than P137800 are output, troubleshoot those DTCs first.
B | GO TO DTC CHART |
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2. | READ FREEZE FRAME DATA |
(a) Using the GTS, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.
HINT:
Vehicle Speed | Short FT Bank 1 |
Engine Speed | Long FT Bank 1 |
Vehicle Load | Fuel System Status Bank 1 |
Coolant Temperature Controlling Value | Misfire Count Cylinder #1 to #6 |
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3. | READ VALUE USING GTS |
(a) Enter the following menus.
Powertrain > Engine > Data List Tester Display |
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Consecutive Prevention Cylinder #1 History 1 |
Consecutive Prevention Cylinder #1 History 2 |
Consecutive Prevention Cylinder #1 History 3 |
Consecutive Prevention Cylinder #1 History 4 |
Consecutive Prevention Cylinder #2 History 1 |
Consecutive Prevention Cylinder #2 History 2 |
Consecutive Prevention Cylinder #2 History 3 |
Consecutive Prevention Cylinder #2 History 4 |
Consecutive Prevention Cylinder #3 History 1 |
Consecutive Prevention Cylinder #3 History 2 |
Consecutive Prevention Cylinder #3 History 3 |
Consecutive Prevention Cylinder #3 History 4 |
Fuel Cut History 1 |
Fuel Cut History 2 |
Fuel Cut History 3 |
Fuel Cut History 4 |
(b) According to the freeze frame data, attempt to reproduce the vehicle conditions that were present when the DTC was stored and read the Data List.
Result | Proceed to |
---|---|
Values are displayed for multiple consecutive prevention cylinder histories of a specific cylinder | A |
Values are displayed for multiple consecutive prevention cylinder histories of all cylinders | B |
HINT:
B | GO TO STEP 6 |
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4. | CHECK IGNITION SYSTEM |
(a) Check the ignition system.
HINT:
Result | Proceed to |
---|---|
The malfunctioning cylinder returns to normal | A |
The malfunctioning cylinder does not return to normal | B |
A | GO TO STEP 22 |
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5. | INSPECT OTHER RELATED COMPONENTS |
(a) Check the power source circuit, wire harness and connectors.
NEXT | GO TO STEP 22 |
6. | READ VALUE USING GTS (SHORT FT B1S1, LONG FT B1S1) |
(a) Start the engine.
(b) Enter the following menus.
Powertrain > Engine > Data List Tester Display |
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Short FT B1S1 |
Long FT B1S1 |
(c) According to the freeze frame data, attempt to reproduce the vehicle conditions that were present when the DTC was stored and read the Data List.
Data List | Result | Proceed to |
---|---|---|
Short FT B1S1 + Long FT B1S1 | -20% or higher, or less than 20% | A |
Short FT B1S1 + Long FT B1S1 | Other than above | B |
HINT:
B | GO TO STEP 11 |
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7. | INTERVIEW THE CUSTOMER |
(a) Interview the customer for details about when oil maintenance was last performed and what brand of oil was used.
(1) Check whether the specified engine oil grade was used and that engine oil additives were not used.
(2) Perform an engine oil inspection (check the oil level and for dirt, etc.).
Click here
OK:
No problem with the engine oil.
HINT:
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8. | INTERVIEW THE CUSTOMER |
(a) Interview the customer for details about what fuel they have used and smell the fuel to check for the following.
HINT:
Even if any of the above conditions are met, if the engine is not malfunctioning, fill the fuel tank at a different gas station and check if the malfunction recurs.
Result | Proceed to |
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None of the above conditions are met and the engine is not malfunctioning | A |
One or more of the above conditions are met and the engine is malfunctioning | B |
HINT:
B | GO TO STEP 10 |
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9. | INSPECT OTHER RELATED COMPONENTS |
(a) Check for accumulated deposits (carbon) and remove them. Deposits (carbon) may act as an ignition source if they become detached, leading to pre-ignition.
HINT:
Strong knocking due to pre-ignition may be caused by detached deposits burning inside the cylinder.
NEXT | GO TO STEP 22 |
10. | REPLACE FUEL |
(a) Replace the fuel.
NEXT | GO TO STEP 23 |
11. | INSPECT MASS AIR FLOW METER SUB-ASSEMBLY |
Click here
NG | GO TO STEP 13 |
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12. | CHECK INTAKE SYSTEM |
(a) Check for air leaks or blockage in the intake system components. If a connection problem or foreign matter is found, repair the connection or remove the foreign matter.
HINT:
NEXT | GO TO STEP 22 |
13. | PERFORM ACTIVE TEST USING GTS (D-4S (INJECTION VOLUME)) |
(a) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(b) Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds.
(c) Idle the engine.
(d) Enter the following menus.
Powertrain > Engine > Active Test Active Test Display |
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D-4S (Injection Volume) |
Data List Display |
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Injection Mode |
A/F (O2) Sensor Current B1S1 |
A/F (O2) Sensor Current B1S2 |
(e) According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume of port injection and direct injection.
NOTICE:
HINT:
Standard:
GTS Display (Sensor) | Injection Volume | Voltage |
---|---|---|
A/F (O2) Sensor Current B1S1 (Air fuel ratio (sensor 1)) | 12.5% | Below -0.075 mA |
-12.5% | More than 0.037 mA | |
A/F (O2) Sensor Current B1S2 (Air fuel ratio (sensor 2)) | 12.5% | Below -0.86 mA |
-12.5% | More than 0.33 mA |
Result | Proceed to |
---|---|
Output voltage values are abnormal | A |
Malfunction disappears when fuel injection volume is increased | B |
Malfunction is still present when fuel injection volume is increased, even if output voltage values are normal | C |
B | GO TO STEP 15 |
C | GO TO STEP 16 |
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14. | REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) AND AIR FUEL RATIO SENSOR (SENSOR 2) |
(a) Replace the air fuel ratio sensor (sensor 1).
Click here
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).
Click here
(b) Replace the air fuel ratio sensor (sensor 2).
Click here
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).
Click here
NEXT | GO TO STEP 23 |
15. | REPLACE FUEL INJECTOR ASSEMBLY |
(a) Replace the fuel injector assemblies of all cylinders.
HINT:
Perform "Inspection After Repair" after replacing the fuel injector assembly.
Click here
NEXT | GO TO STEP 23 |
16. | PERFORM ACTIVE TEST USING GTS (ACTIVATE THE CIRCUIT RELAY (BRUSHLESS)) |
(a) Enter the following menus.
Powertrain > Engine > Active Test Tester Display |
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Activate the Circuit Relay (Brushless) |
(b) When performing the Active Test, check for an operating sound from the fuel pump (for low pressure side).
OK:
Activate the Circuit Relay (Brushless) | Specified Condition |
---|---|
ON | Operating sound heard |
OFF | Operating sound not heard |
NG | GO TO STEP 21 |
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17. | INSPECT FUEL PUMP (LOW PRESSURE SIDE) |
(a) Attach a fuel pressure gauge and check the fuel pressure when cranking the engine and after stopping the engine.
Click here
Standard:
Vehicle State | Specified Condition |
---|---|
Cranking engine | 196 to 833 kPa (2.0 to 8.5 kgf/cm2, 28 to 121 psi) |
5 minutes after stopping engine | 98 kPa (1.0 kgf/cm2, 14 psi) or higher |
HINT:
NG | GO TO STEP 20 |
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18. | READ VALUE USING GTS (FUEL PRESSURE (HIGH)) |
(a) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(b) Enter the following menus.
Powertrain > Engine > Data List Tester Display |
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Fuel Pressure (High) |
(c) Read the values.
Standard:
3000 rpm
2800 to 20000 kPag.
HINT:
The A/C switch and all accessory switches should be off, and the neutral should be selected, and the engine should be fully warmed up.
NG | GO TO STEP 22 |
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19. | INSPECT OTHER RELATED COMPONENTS |
(a) Inspect other related components.
HINT:
If the malfunctioning part could not be determined by performing the preceding inspections, one of the following malfunctions is suspected.
NEXT | GO TO STEP 22 |
20. | INSPECT RELATED PARTS |
(a) Inspect the following fuel pump (for low pressure side) related parts:
NEXT | GO TO STEP 22 |
21. | INSPECT FUEL PUMP CONTROL SYSTEM |
(a) Inspect the fuel pump control system.
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22. | REPAIR OR REPLACE MALFUNCTIONING PARTS |
(a) Repair or replace the malfunctioning part.
(b) Perform "Inspection After Repair" after repairing or replacing the malfunctioning part.
Click here
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23. | CONDUCT CONFIRMATION TEST |
(a) Check that the engine has returned to normal.
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24. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCsNEXT | END |
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