Dtc P20Cf Exhaust Aftertreatment Fuel Injector A Stuck Open

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (IN ADDITION TO DTC P20CF)

CHECK FOR WHITE SMOKE (WHITE SMOKE AND ODOR)

PERFORM CONFIRMATION DRIVING PATTERN (WHITE SMOKE AND SENSORY INSPECTION)

REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY

CLEAN FUEL FILTER CASE AND REPLACE FUEL FILTER

PERFORM PM FORCED REGENERATION

CHECK FUEL INJECTION SYSTEM

CHECK INTAKE / EXHAUST SYSTEM

CHECK AFTER TREATMENT CONTROL SYSTEM

GO TO DTC CHART

CHECK AND REPLACE TURBOCHARGER SUB-ASSEMBLY

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

NOTICE:

1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
   
2. After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK059X.html) and initialization (HILUX_TGN26 RM000000TIN057X.html).
   
3. After replacing the fuel supply pump assembly, the ECM needs initialization (HILUX_TGN26 RM000000TIN057X.html).
   
4. After replacing an injector assembly, the ECM needs registration (HILUX_TGN26 RM0000012XK059X.html).
   

HINT:

Read freeze frame data using the intelligent tester. 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, and other data from the time the malfunction occurred.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the tester on.
   

4. Enter the following menus: Powertrain / Engine and ECT / DTC.
   

5. Read the DTCs.
   
   

   Result

   Result	Proceed to
   P20CF is output	A
   P20CF and other DTCs are output	B

   HINT:

   1. When DTC P20CF and following DTCs are output, uncombusted fuel adhesion to the air fuel ratio sensor due to air fuel ratio sensor malfunction, fuel leaks, insufficient combustion due to parts malfunction (intake, exhaust or injection system), or an exhaust fuel addition injector assembly wiring malfunction is suspected as a cause. Therefore, diagnose the following DTCs first.
      
   2. DTCs for the air fuel ratio sensor are P2237, P2238, P2239, P2252 and P2253 (HILUX_TGN26 RM0000018WZ01WX.html).
      
   3. A DTC for fuel leakage is P0093 (HILUX_TGN26 RM0000012X903OX.html).
      
   4. DTCs for the exhaust fuel addition injector assembly wiring malfunction are P20CB, P20CD and P20CE (HILUX_TGN26 RM0000018X701XX.html).
      
   5. A DTC for EGR valve flow malfunction is P0400 (HILUX_TGN26 RM0000041P801YX.html).
      
   6. A DTC for EGR valve stuck open is P042E (HILUX_TGN26 RM000004KMK00EX.html).
      

NOTICE:

If a fuel odor is noted from the white smoke during the inspection, fuel leaks from the exhaust fuel addition injector assembly are suspected.

1. Disconnect the cable from the negative (-) battery terminal or remove the ECD fuse for 1 minute or more.
   

2. Start the engine and race it to 3000 rpm several times.
   

3. Check for white smoke in the exhaust gas. If found, check for a fuel odor or the smell of burning oil.
   
   

   Result

   Result	Proceed to
   White smoke and a fuel odor are present.	A
   White smoke and a smell of burning oil are present.	B
   Except above	C

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the tester on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / AF Lambda B1S1 and Exhaust Temperature B1S3.
   

5. Drive the vehicle until the value of Exhaust Temperature B1S3 becomes 300°C (572°F) or more to activate the air fuel ratio sensors.
   

   HINT:

   Activation of the air fuel ratio sensor can be checked by confirming whether the value of AF Lambda B1S1 has changed from 1.99.

6. Check that there is no problem on driving performance such as hesitation, knocking, rough idling, insufficient power and acceleration stumbling, or white smoke in emissions.
   

   
   
   
   

   HINT:

   1. The air fuel ratio sensor does not operate until the vehicle has been driven for a period of time with an exhaust gas temperature of 200°C (392°F) or more.
      
   2. Perform diagnosis when the air fuel ratio sensor is operating and active.
      
   3. Normal condition in the illustration is only an example. "AF Lambda B1S1" changes depending on driving conditions. If it changes at the range more than 1.0, it is normal.
      
   
   

   Result

   Result	Proceed to
   There is no problem with driving performance such as hesitation, knocking, rough idling, insufficient power or acceleration stumbling, but excessive white smoke is present in the exhaust gas	A
   Except above	B

   HINT:

   If white smoke is present in the exhaust gas without any driving performance problems such as hesitation, knocking, rough idling, insufficient power or acceleration stumbling, fuel injected due to a malfunction in the exhaust fuel addition injector assembly is the suspected cause of the white smoke.

1. Replace the exhaust fuel addition injector assembly (HILUX_TGN26 RM000003TI800QX.html).
   

1. Clean the fuel filter case and replace the fuel filter.
   

   HINT:

   Be sure to clean the inside of the fuel filter case as the fuel injectors may not operate properly if the fuel filter is installed with foreign matter remaining inside the fuel filter case.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the tester on.
   

3. Clear the DTCs (HILUX_TGN26 RM000000PDK0X3X.html).
   

4. Perform PM forced regeneration (HILUX_TGN26 RM00000187701VX_02_0008.html).
   

   Result:

   PM forced regeneration completes normally.
   

1. Check the fuel injection system (HILUX_TGN26 RM000004KNK00IX.html).
   

1. Check the intake/exhaust system (HILUX_TGN26 RM000004KNL00EX.html).
   

1. Check the after treatment control system (HILUX_TGN26 RM000004KNM00CX.html).
   

1. Perform inspection and repair of relevant DTCs (HILUX_TGN26 RM0000031HW031X.html).
   

1. Check for oil leaks and white smoke from the turbocharger sub-assembly and perform any necessary repairs (HILUX_TGN26 RM00000416R06KX.html).
   

   HINT:

   Other than a malfunction of the turbocharger subassembly, exhaust valve stem oil leaks are suspected.

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to ON and turn the tester on.
   

3. Clear the DTCs (HILUX_TGN26 RM000000PDK0X3X.html).
   

4. Perform PM forced regeneration (HILUX_TGN26 RM00000187701VX_02_0008.html).