HYBRID CONTROL SYSTEM, Diagnostic DTC:P1EC900

DTC Code DTC Name
P1EC900 Hybrid/EV Powertrain Control Module Processor or Monitoring Processor Solar Charging Permission Signal Internal Failure

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    When solar charging is started, the hybrid vehicle control ECU checks the solar charge permission signal (SSEN) output to the solar energy control unit and the answer back signal output by the solar energy control unit.

    This DTC is stored if the solar charge permission signal output by the hybrid vehicle control ECU is abnormal. In this case, the operation of the solar charge permission signal cannot be assured.

    The cause of this malfunction may be one of the following:


      Hybrid vehicle control ECU internal malfunction

    • Hybrid vehicle control ECU malfunction

DESCRIPTION

The hybrid vehicle control ECU performs a function check to check for an abnormal solar charging start permission signal (SSEN signal). If it detects an abnormal signal, it will store a DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P1EC900 Hybrid/EV Powertrain Control Module Processor or Monitoring Processor Solar Charging Permission Signal Internal Failure

Solar charge permission signal output by the hybrid vehicle control ECU is abnormal.

(1 trip detection logic)

 Hybrid vehicle control ECU Does not come on

Solar Charging Warning Light:

Comes on
Related Data List
DTC No. Data List
P1EC900

  • Solar Charge Hybrid Battery DC/DC Converter Drive Request

  • Solar Charging Permission Signal by Main CPU

  • Solar Charging Permission Signal by Sub CPU

  • Solar Charging Permission Answerback Signal from Solar Charging Control ECU

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here


  1. Park the vehicle in an area where the solar radiation will be steady.

    Weather Clear or mostly clear and sunny
    Time Between 11:00 and 14:00
    Place An area where sunlight strikes the solar roof directly

    Tech Tips


    • Make sure no part of the solar roof is shaded

    • If the solar roof is dirty, clean it.

  2. Turn the power switch off and then disconnect the cable from the negative (-) auxiliary battery terminal.

  3. Wait for 5 seconds or more, then disconnect the power source connector and then all other low voltage connectors the solar energy control unit.

  4. Wait for 30 seconds or more, then connect the low voltage connectors of the solar energy control unit except the power source connector and then connect the power source connector.

  5. Connect the cable to the negative (-) auxiliary battery terminal.

  6. Turn the power switch on (IG), wait for 5 to 10 seconds, and then turn the power switch off.

    Tech Tips

    Make sure to turn the power switch off within 10 seconds

  7. Wait for 20 minutes and then check for DTCs to check that no DTCs have been stored.

    Tech Tips


    • While waiting, the HV battery will be charged by the solar charging system. However, depending on certain conditions, charging may not be performed.

    • If the SOC of the HV battery is 90% or more, the HV battery will not be charged by the solar charging system.

    • If any of the following conditions is met, the HV battery will not be charged by the solar charging system:


      • The HV battery is charged via an external power source.

      • The power switch is on (ACC).

      • The power switch is on (IG).

      • The power switch is on (READY).

      • The HV battery heating system is operating.

      • The remote air conditioning system is operating.

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL AND SOLAR CHARGING CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control and Solar Charging Control / Trouble Codes.

    4. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      Powertrain > Solar Charging Control > Trouble Codes
      Result
      Result Proceed to
      P1EC900 only is output, or DTCs except the ones in the table below are also output. A
      DTCs of hybrid control system in the tables below are output. B
      DTCs of solar charging system in the tables below are output. C
      Malfunction Content System Relevant DTC
      Microcomputer malfunction Hybrid control system P060647 Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure
      P060687 Hybrid/EV Powertrain Control Module Processor to Monitoring Processor Missing Message
      P060694 Hybrid/EV Powertrain Control Module Processor Unexpected Operation
      P060A29 Hybrid/EV Powertrain Control Module Monitoring Processor Signal Invalid
      P060A44 Hybrid/EV Powertrain Control Module Monitoring Processor Data Memory Failure
      P060A45 Hybrid/EV Powertrain Control Module Monitoring Processor Program Memory Failure
      P060A47 Hybrid/EV Powertrain Control Module Monitoring Processor Watchdog / Safety MCU Failure
      P060A49 Hybrid/EV Powertrain Control Module Monitoring Processor Internal Electronic Failure
      P060A87 Hybrid/EV Powertrain Control Module Processor from Monitoring Processor Missing Message
      P060A94 Hybrid/EV Powertrain Control Module Monitoring Processor Unexpected Operation
      P1ECA00 Hybrid/EV Powertrain Control Module Processor and Monitoring Processor Solar Charging Shutdown Signal Stuck On
      P1ECB00 Hybrid/EV Powertrain Control Module Processor and Monitoring Processor Solar Charging Shutdown Signal Stuck Off
      Power source circuit malfunction Hybrid control system P056014 System Voltage (BATT) Circuit Short to Ground or Open
      P06881F ECM/PCM Power Relay Sense Circuit Intermittent
      Communication system malfunction Hybrid control system U113A87 Lost Communication with Solar Charging Control Module Missing Message
      Solar charging system U029387 Lost Communication with Hybrid/EV Powertrain Control Module Missing Message
      U115087 Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message
      System malfunction Hybrid control system P1C9E9F Hybrid/EV System Reset Stuck Off

      Tech Tips


      • P1EC900 may be output as a result of the malfunction indicated by the DTCs above.


        1. The chart above is listed in inspection order of priority.

        2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

    5. Turn the power switch off.


    A

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    C

    GO TO DTC CHART (SOLAR CHARGING SYSTEM) Click here