Dtc P1603 Engine Stall History

DESCRIPTION

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT

READ FREEZE FRAME DATA (ISC LEARNING VALUE)

READ FREEZE FRAME DATA (AFS VOLTAGE B1S1, SHORT FT #1 AND LONG FT #1)

DESCRIPTION

INSPECTION PROCEDURE

HINT:

1. In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1603 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as engine stall.
   As these DTCs can be stored as a result of certain user actions, even if these DTCs are output, if the customer makes no mention of problems, clear these DTCs without performing any troubleshooting and return the vehicle to the customer.
   
2. DTCs related to engine stall and starting problems may be detected due to operations performed by the user. The following are a few examples. Ask questions to the user about how the vehicle is operated and give advice as necessary.
   
1. Ran out of fuel
   
2. Rolled down on a slope and engine stalls (backed up in D, moved forward in R)
   
3. If any other DTCs are output, perform troubleshooting for those DTCs first.
   
4. Use any information from the customer problem analysis about the condition of the vehicle at the time when the problem occurred (how the engine stopped, conditions when the engine was restarted, etc.) as a reference.
   
   

   Symptom	Suspected Area
   Engine vibration occurs and engine stops	Abnormal mass air flow meter sub-assembly output due to existence of foreign matter Abnormal air fuel ratio due to malfunction of air fuel ratio sensor or heated oxygen sensor, air leaks in intake system or insufficient fuel supply
   Engine stops with no engine vibration	Ignition system, injection stoppage, high load from external parts
   Engine can be started with accelerator pedal depressed	Insufficient air volume
   Engine stalls or is difficult to start immediately after engine stalled, regardless of whether engine is cold or warm	Deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve

5. Read freeze frame data using the GTS. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
   
6. When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data (LandCruiser RM000000SXU01JX.html).
   
7. When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
   
8. Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in D or N) and compare this data with the freeze frame data.
   
9. Inspections take into account the fact that the malfunction may not have reoccurred and place emphasis on checking the vehicle conditions present at the time when the malfunction occurred.
   
10. When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
    

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

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

5. Read the DTCs.
   
   

   Result:

   
   

   Result	Proceed to
   Only DTC P1603 is output	A
   DTCs other than P1603 are output	B

   HINT:

   1. When DTC P1603 and P1605 are output simultaneously, perform the troubleshooting for P1605 first.
      
   2. Using freeze frame data, confirm the conditions the moment the DTC was stored and after the DTC was stored. This information can be useful when troubleshooting.
      

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Using the GTS, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored (LandCruiser RM000000SXU01JX.html).
   
   

   Result

   Freeze Frame Data Item for DTC P1603	Result	Suspected Area	Action	Proceed to
   ISC Learning Value	Less than 6.2 L/s	-	Go to the next step	A
   	6.2 L/s or more	Throttle valve assembly	Go to Engine Stalls (from step 11)	B

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Using the GTS, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored (LandCruiser RM000000SXU01JX.html).
   
   

   Result

   Freeze Frame Data Item for DTC P1603			Suspected Area	Action	Proceed to
   AFS Voltage B1S1	Short FT #1	Long FT #1
   3.8 V or higher	15% or more	-	Fuel pump	Go to Engine Stalls (from step 20)	NEXT
   Less than 2.8 V, or 3.8 V or higher	Less than -15%, or 15% or more	Less than -15%, or 15% or more	Mass air flow meter sub-assembly Air fuel ratio sensor Fuel pump	Go to Engine Stalls (from step 15)*
   2.8 V to 3.8 V	-15% to 15%	-15% to 15%	-	Go to Engine Stalls

   HINT:

   *: If the value of AFS Voltage B1S1, Short FT #1 or Long FT #1 is as specified, malfunction of a component listed in the "Suspected Area" column of the table is suspected.