Purportedly from Toyota on the issue:


This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.

Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.

HINT
* In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as starting difficulty.
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.
* If any other DTCs are output, perform troubleshooting for those DTCs first.
* When the Data List item "Immobiliser Fuel Cut" is ON, the engine cannot be started.
* Read freeze frame data using the Techstream. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.
* When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data See: Computers and Control Systems > Scan Tool Testing and Procedures > Freeze Frame Data.
* When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
* Try to start 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 compare it with the freeze frame data.
* If the malfunction does not reoccur, carefully check the vehicle conditions from when the malfunction occurred using freeze frame data.
* When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
* If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is not necessary to repeat the procedure the second time.

 

Hello everyone!
I have a '15 Corolla S Plus and I recently purchased a scan tool to use on customer cars (I'm a service writer) and on my personal cars (I have older Toyotas). Just for fun i plugged it in to my '15 and the code P1604 came up. The MIL light isn't on and I'm not having startability issues. Has anyone else seen this code? My car only has 11,000 miles I don't see why it should be having codes already. Any advice??


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P1604 Startability Malfunction
A lot of thing could cause this engine code!

-Battery
-Starting system
-Low quality fuel
-Injector compensation code
-Fuel filter
-Cylinder compression pressure
-Injector assembly
-Engine coolant temperature sensor
-Glow system
-Supply pump assembly
-Common rail assembly
-ECM
-Stop and start system
-MAP
-MAF
-Intake Air
-Coolant Temp
-Battery Voltage
-Starter Signal
-Engine Speed of Cyl #1 (to #4)
-Immobiliser Communication
-Target Common Rail Pressure
-Fuel Press
-Target Pump SCV Current
-Injection Feedback Val #1 (to #4)
-Injection Volume
-Actual Throttle Position
-Throttle Motor Duty
-Target EGR Pos.
-Actual EGR Valve Pos.
-EGR Close Lrn. Status
-EGR Close Lrn. Val.
http://corolla-club.ru/doc1/413e7ad0f326502bb086e4fe557b27e3.html

You should get to Toyota dealer as soon as you can!!!!!!!!

 

P1604Startability Malfunction

A lot of thing could cause this engine code!



-Battery

-Starting system

-Low quality fuel

-Injector compensation code

-Fuel filter

-Cylinder compression pressure

-Injector assembly

-Engine coolant temperature sensor

-Glow system

-Supply pump assembly

-Common rail assembly

-ECM

-Stop and start system

-MAP

-MAF

-Intake Air

-Coolant Temp

-Battery Voltage

-Starter Signal

-Engine Speed of Cyl #1 (to #4)

-Immobiliser Communication

-Target Common Rail Pressure

-Fuel Press

-Target Pump SCV Current

-Injection Feedback Val #1 (to #4)

-Injection Volume

-Actual Throttle Position

-Throttle Motor Duty

-Target EGR Pos.

-Actual EGR Valve Pos.

-EGR Close Lrn. Status

-EGR Close Lrn. Val.

http://corolla-club.ru/doc1/413e7ad0f326502bb086e4fe557b27e3.html



You should get to Toyota dealer as soon as you can!!!!!!!!

I deleted the code [emoji24] but I'm taking it in on Tuesday for my shift selector so I'll let them know that the code was in there. I work down the street from Toyota and I'm always in touch with their advisors so hopefully they can still do something for me.

 

Hold on with the sensors... P1604 does not relate to camshaft or crankshaft position sensors. P1604 is just a general Startability Malfunction trouble code. Start by servicing your ground connections underneath battery to chassis, driver's side strut tower, and driver's side engine head. Remove the eyelet bolt to sand off any rust and oxidation, then reinstall. Clan also your battery terminals and the inside of battery connectors.