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 SENSOR INSPECTION)

REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY

REPLACE FUEL FILTER ELEMENT ASSEMBLY

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. After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AVX.html) and initialization (LandCruiser RM000000TIN08IX.html).
   
2. After replacing an injector assembly, the ECM needs registration (LandCruiser RM0000012XK0AVX.html).
   

HINT:

Read freeze frame data using the GTS. 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 GTS to the DLC3.
   

2. Turn the engine switch on (IG).
   

3. Turn the GTS on.
   

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

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 (LandCruiser RM0000018WZ03MX.html).
      
   3. A DTC for fuel leakage is P0093 (LandCruiser RM0000012X9082X.html).
      
   4. DTCs for the exhaust fuel addition injector assembly wiring malfunction is P20CD (LandCruiser RM0000018X703NX.html).
      
   5. A DTC for EGR valve flow malfunction is P0400 (LandCruiser RM0000041P806LX.html).
      
   6. A DTC for EGR valve stuck open is P042E (LandCruiser RM000004KMK024X.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 EFI-MAIN NO. 1 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 GTS to the DLC3.
   

2. Turn the engine switch on (IG).
   

3. Turn the GTS on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Diesel Exhaust / 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 (LandCruiser RM000005UK8000X.html).
   

1. Replace the fuel filter element assembly (LandCruiser RM0000045HW008X.html).
   

1. Connect the GTS to the DLC3.
   

2. Turn the engine switch on (IG) and turn the GTS on.
   

3. Clear the DTCs (LandCruiser RM000000PDK1ENX.html).
   

4. Perform PM forced regeneration (LandCruiser RM000005UDV000X_01_0001.html).
   

   Result:

   PM forced regeneration completes normally.
   

1. Check the fuel injection system (LandCruiser RM000004KNK023X.html).
   

1. Check the intake/exhaust system (LandCruiser RM000004KNL01TX.html).
   

1. Check the after treatment control system (LandCruiser RM000004KNM01JX.html).
   

1. Perform inspection and repair of relevant DTCs (LandCruiser RM0000031HW07PX.html).
   

1. Check for oil leaks and white smoke from the turbocharger sub-assembly and perform any necessary repairs (LandCruiser RM00000416R0CTX.html).
   

   HINT:

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

1. Connect the GTS to the DLC3.
   

2. Turn the engine switch on (IG) and turn the GTS on.
   

3. Clear the DTCs (LandCruiser RM000000PDK1ENX.html).
   

4. Perform PM forced regeneration (LandCruiser RM000005UDV000X_01_0001.html).