DTC P1604: Startability Malfunction [01/2019 - 03/2019]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.

   Powertrain > Engine and ECT > Trouble Codes 

   Result

   Result	Proceed to
   DTC P1604 is output	A
   DTC P1604 and other DTCs are output	B

   HINT: 

   • If any DTCs other than P1604 are output, troubleshoot those DTCs first.
   • 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.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [01/2019 - 03/2019] 

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Using the Techstream, confirm the vehicle conditions recorded in the Freeze Frame Data which were present when the DTC was stored.

   Powertrain > Engine and ECT > DTC (P1604) > Freeze Frame Data 

   Tester Display
   Immobiliser Communication
   Immobiliser Fuel Cut

   OK

   Data List Item	Techstream Display
   Immobiliser Communication	ON
   Immobiliser Fuel Cut	OFF

   HINT: 

   If the engine is started immediately after reconnecting the battery terminal, the engine may stall immediately after it starts due to the intercommunication process between each ECU. For this reason, when starting the engine after reconnecting the battery terminal, first turn the ignition switch to ON and then wait several seconds for the communication process to complete before starting the engine.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CHECK ENGINE IMMOBILISER SYSTEM 

1. w/ Smart Key System: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [01/2019 - 09/2022]
2. w/o Smart Key System: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [01/2019 - 09/2022]

Result: 

OK 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Using the Techstream, confirm the vehicle conditions recorded in the Freeze Frame Data which were present when the DTC was stored.

   Powertrain > Engine and ECT > DTC (P1604) > Freeze Frame Data 

   Tester Display
   ISC Learning Value

   Result

   Freeze Frame Data Item	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 higher	Throttle body assembly	Go to Engine Difficult to Start (from step 15)	B

Result: 

B 

GO TO ENGINE DIFFICULT TO START. Refer to  Engine Difficult to Start [01/2019 - 11/2022] 

Result: 

A 

See step  4

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Using the Techstream, confirm the vehicle conditions recorded in the Freeze Frame Data which were present when the DTC was stored.

   Powertrain > Engine and ECT > DTC (P1604) > Freeze Frame Data 

   Tester Display
   Engine Speed

   Result

   Freeze Frame Data Item	Result	Suspected Area	Action	Proceed to
   Engine Speed	All 5 sets of Freeze Frame Data are 0 rpm (engine did not crank or engine speed was not detected properly)	Starter signal circuit Crank position sensor system Battery fully depleted	Go to Engine Difficult to Start (from step 5)	A
   	100 to 500 rpm (engine cranked but initial combustion did not occur or was delayed)	Fuel pump Leaking fuel injector assembly Spark plug Ignition coil assembly	Go to the next step	B
   	500 rpm or higher (engine speed dropped immediately after initial combustion) (Low Rev for Eng Start is ON)	Spark plug Ignition coil assembly

Result: 

A 

GO TO ENGINE DIFFICULT TO START. Refer to  Engine Difficult to Start [01/2019 - 11/2022] 

Result: 

B 

See step  5

1. Interview the customer for details about the conditions when the malfunction occurred.

   HINT: 

   If the engine is difficult to start only when the vehicle has been left as is for a long time, a leaking fuel injector assembly is suspected.

   Result

   Result	Suspected Area	Action	Proceed to
   Engine is difficult to start only when the vehicle has been left as is for a long time (1 hour or more)	Leaking fuel injector assembly	Go to Engine Difficult to Start (from step 4)	A
   Other than above	Fuel pump Spark plug Ignition coil assembly	Go to the next step	B

Result: 

A 

GO TO ENGINE DIFFICULT TO START. Refer to  Engine Difficult to Start [01/2019 - 11/2022] 

Result: 

B 

See step  6

1. Interview the customer for details about the conditions when the malfunction occurred.

   HINT: 

   If the vehicle is mostly driven for short distances, deposits may have accumulated on the spark plugs, causing starting difficulty.

   Result

   Result	Suspected Area	Action	Proceed to
   Mostly driven short distances	Spark plug Ignition coil assembly	Go to Engine Difficult to Start (from step 13)	NEXT
   Not mostly driven short distances	Fuel pump Spark plug Ignition coil assembly	Go to Engine Difficult to Start (from step 9)

Result: 

NEXT 

GO TO ENGINE DIFFICULT TO START. Refer to  Engine Difficult to Start [01/2019 - 11/2022]