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Thread: Toyota Vitz Engine Stalling - P1603 Error Code

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    Exclamation Toyota Vitz Engine Stalling - P1603 Error Code

    Hello,

    I am facing a critical issue with my vitz regarding Engine stall - P1603 Error Code. This issue bother me because my car engine stall in middle of the road anytime and I don't know the exact fault of this issue. This issue happen when my car is in low RPM or in Low speed with AC is ON. I first though there is some issue with AC but When I checked with mechanic told me the AC is fine. The mechanic said that car is giving some signal or reading that cause that issue but he don't know for sure. Engine Stalling is very furstrating issue i have experience now. I am attaching Freeze Frame Data of P1603 Error Code. Experts Can you check freeze frame data and suggest me whats the issue?

    @Xulfiqar @capsat @tyrone_40 @syncview @rajaatta @chinyoti @SER_GTR @murtaza_murti


    Trouble Code Recorded in ECU

    Toyota Vitz Engine Stalling  P1603 Error Code -1702719


    P1603 Freeze Frame Data

    Toyota Vitz Engine Stalling  P1603 Error Code -1702720

    Note: Save the freeze frame data image in order to view it bigger

    - RKBladeX

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    Did you get your can scanned at a workshop?

    The most smallest issue could be a clogged throttle body.
    Get over the fact that Xli lacks power windows, Its an Xli because it lacks thoose features or else it would be a Gli or an Altis if had all the goodies.

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    Quote Originally Posted by chinyoti View Post
    Did you get your can scanned at a workshop?

    The most smallest issue could be a clogged throttle body.
    I have recently cleaned throttle body but issue is still there.

    I have scan from my own MiniVCI Cable through Toyota Techstream Software not from workshop.

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    P1603 Can Be Due To Lack Of Communication Between ECM And TCM....Can Be Due To Faulty Unit Itself Or Loose Connection

    I Suggest To Disconnect..Clean And Reconnect Grips And Look For Any Loose Connections Around Tranny Or With ECM/TCM

    Disconnect And Reconnect Battery Later and Test Again

    It Can Also Be Due To Faulty Or Clogged Fueling System Dropping Pressure Leading To Stalls
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    This can give some basic indication

    P1603 Code - General - TCU Communication Error

    OBD-II code P1603 indicates an issue with TCU communication.

    There are communications that exist between the engine control module, or ECM, and the transaxle control module, or TCM. This communication is done through a control area network, or CAN. With the communication of the CAN, an independent pin and wiring is needed to receive a signal that includes sensor information from the ECM. The more information there is to communicate, the more wiring that is needed. When it comes to CAN communication, all of the information communicated is done alone control modules like the ECM and TCM using CAN lines. When there is a problem with these lines, the ECM will detect the problem and store a P1603 trouble code; the storing of the trouble code is what causes the SES or check engine light to illuminate on the dash.

    Possible causes of trouble code P1603 include:

    Faulty transaxle control module (TCM)
    Faulty engine control module (ECM)
    Harness running from the TCM to the ECM has a short
    There is a poor electrical connection between the TCM and ECM

    Diagnosing the exact cause of the problem should always begin with a visual inspection that could reveal bad wiring, loose connections, or damaged parts. From there, it is a matter of running down the list to determine what needs to be replaced. In general, a bad ECM will cause a loss of power, poor fuel economy, and stalling engine

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    Quote Originally Posted by rkbladex View Post
    I have recently cleaned throttle body but issue is still there.

    I have scan from my own MiniVCI Cable through Toyota Techstream Software not from workshop.

    - RKBladeX
    Bhai are you getting a check engine light?

    Stop using your own cable, Get the car checked by a mechanic or Toyota it self, They will guide you better, Self diagnosis is not always good, Google is not always right, Google is often mixing Toyota/ Honda/ and other car codes.
    Get over the fact that Xli lacks power windows, Its an Xli because it lacks thoose features or else it would be a Gli or an Altis if had all the goodies.

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    Quote Originally Posted by chinyoti View Post
    Bhai are you getting a check engine light?

    Stop using your own cable, Get the car checked by a mechanic or Toyota it self, They will guide you better, Self diagnosis is not always good, Google is not always right, Google is often mixing Toyota/ Honda/ and other car codes.
    Check engine light don't prompt when engine is started but when i give self to my car following light is appear and don't hide after few secs which are engine oil light, CEL light and battery light. These lights don't hide after few secs of when i give self to my cars

    Yes, you are right self diagnose is not good because it require knowledge to understand the car. Can you suggest any workshop that provide good knowledgeable scanning services in Karachi except Toyota? because Toyota gave me quote of Sky high charges.

    - RKBladeX
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    https://www.pakwheels.com/forums/vit...-help-required

    Here is your previous thread. You bringing up the same issue again.
    Get over the fact that Xli lacks power windows, Its an Xli because it lacks thoose features or else it would be a Gli or an Altis if had all the goodies.

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    The above mentioned thread is specially for P1605 (Rough idle) and yes both problems are interconnected and more or less same.

    - RKBladeX
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    looking at ff data, the map sensor is suspicious.
    replace and check

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    Quote Originally Posted by syncview View Post
    looking at ff data, the map sensor is suspicious.
    replace and check

    Sent from my Infinix-X600-LTE using Tapatalk
    What is normal range of map sensor? as it is showing 14PSI in freeze frame data.

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    Quote Originally Posted by rkbladex View Post
    What is normal range of map sensor? as it is showing 14PSI in freeze frame data.

    - RKBladeX
    Its in the engine control system pdf I sent you last week

    50 to 115 kPa: ignition switch on (IG)
    17 to 39 kPa: Idling
    22 to 50 kPa: 2,500rpm

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    Quote Originally Posted by rkbladex View Post
    What is normal range of map sensor? as it is showing 14PSI in freeze frame data.

    - RKBladeX
    14psi means almost no vacuum
    ff data shows the vehicle was not in decel motion when the code was triggered, hence, when the engine is idling, it should be showing about 30kpa at those engine speeds
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    Ok Map sensor reading is normal at thos range the problem seems to be ranging from. Clogged vvti actuator till jammed egr valve in this case just had to analyze both pf these main components. And also check the engine wiring loom for Map sensor there must be some loose connection or poor contact points or may be the local ustaad some how managed to break and fixed the wires with the help of Niittttooooooo or KaKa tape.........
    Keep us posted with your problem will try to assist you as you are not in our home city. Good luck with the diagnosis.

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    Tje Psi range is normal as the techstream was configured that way. You can change the setting of pressure measuring from psi to kpa.

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    It is the EEPROM malfunction in the Engine Control Module. Probably it needs to be replaced with a good known one, even purchased from the junk.

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    Just to update you guys My car engine don't stalling now on low RPM or Speed during AC operation. I don't have done anything except one which is pouring Full Tank High Octane. So Now i realize this issue is related to Fuel. One thing happen when i pour full tank HOBC in my car now my car taking long self on Cold starting in morning or when engine is cold.

    Can you guys know what was the issue?

    - RKBladeX
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    May be there is some issue with Fuel filter and Fuel pressure or something else related to fuel?

    - RKBladeX
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    Quote Originally Posted by rkbladex View Post
    Just to update you guys My car engine don't stalling now on low RPM or Speed during AC operation. I don't have done anything except one which is pouring Full Tank High Octane. So Now i realize this issue is related to Fuel. One thing happen when i pour full tank HOBC in my car now my car taking long self on Cold starting in morning or when engine is cold.

    Can you guys know what was the issue?

    - RKBladeX
    Happened to my vitz 2 weeks back when I poured two tanks of hobc. Nothing to worry. Use 2 tanks of super and then afterwards mix hobc with super, issue will be gone. My long selfs have decreased almost 90% using this technique, not 100% ok though


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    Mine vitz has same issue after HOBC fuel.

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