STOP AND START SYSTEM, Diagnostic DTC:P0617

DTC Code DTC Name
P0617 Starter Relay Circuit High

DESCRIPTION

When the engine is started by stop and start control, the engine stop and start ECU controls the starter assembly by activating the ST relay (for starter pinion operation) via voltage from terminal STA and then, using its built-in starter delay circuit, activating the ST NO. 2 relay (for starter motor operation) via voltage from terminal STA2.

If overcurrent is detected in the starter relay circuit, the engine stop and start ECU stores DTC P0617 and blinks the stop and start cancel indicator.

DTC No. DTC Detection Condition Trouble Area
P0617

Both of the following conditions are met for 1 second

(1 trip detection logic):


  • Engine switch is turned on (IG)

  • Overcurrent to ST relay or ST NO. 2 relay is detected.

  • Wire harness or connector

  • ST relay

  • ST NO. 2 relay

  • Engine stop and start ECU

CONFIRMATION DRIVING PATTERN

Tech Tips

DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs Click here.


  1. CONFIRMATION AFTER TROUBLESHOOTING

    Tech Tips


    • If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 60 minutes until refresh charge is completed and stop and start control operation is permitted.

    • Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Start the engine and warm it up.

    5. Drive the vehicle at 7 km/h (4.3 mph) or more.

      CAUTION:

      When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

    6. Depress the brake pedal and stop the vehicle.

    7. Keep the engine stopped by stop and start control for 1 second or more (Keep the shift lever in D).

    8. Release the brake pedal with the shift lever in D to start the engine.

    9. Check that DTCs are not output Click here.

  2. STOP AND START SYSTEM OPERATION CHECK

    Tech Tips

    If the cable is disconnected from the negative (-) battery terminal, stop and start control is prohibited until refresh charge is completed. In this case, drive the vehicle approximately 5 to 60 minutes until refresh charge is completed and stop and start control operation is permitted.


    1. Start the engine and warm it up.

    2. Turn the air conditioning system off.

    3. Drive the vehicle at 7 km/h (4.3 mph) or more.

      CAUTION:

      When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.

    4. Depress the brake pedal and stop the vehicle.

    5. Allow the engine to stop by stop and start control. (Keep the shift lever in D.)

    6. Release the brake pedal with the shift lever in D to start the engine.

WIRING DIAGRAM

A01W0KUE05

CAUTION / NOTICE / HINT

Note


  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU Click here.

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU Click here.

  • After replacing the engine stop and start ECU or airbag sensor assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU Click here.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting Click here.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BBC NO. 1, BBC NO. 2)


    1. Disconnect the A76 engine stop and start ECU connector.

    2. Remove the BBC NO. 1 fuse from engine room relay block and junction block assembly.

    3. Remove the BBC NO. 2 fuse from engine room relay block and junction block assembly.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A76-1 (BIN2) - BBC NO. 1 fuse terminal 2 Always Below 1 Ω
      A76-3 (BIN1) - BBC NO. 2 fuse terminal 2 Always Below 1 Ω
      A76-1 (BIN2) or BBC NO. 1 fuse terminal 2 - Body ground Always 10 kΩ or higher
      A76-3 (BIN1) or BBC NO. 2 fuse terminal 2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST, ST NO. 2 RELAY)


    1. Disconnect the A36 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the D72 park/neutral position switch assembly connector.

    3. Disconnect the A75 ECM connector.

    4. Disconnect the A77 engine stop and start ECU connector.

    5. Remove the ST relay from engine room relay block and junction block assembly.

    6. Remove the ST NO. 2 relay from engine room relay block and junction block assembly.

    7. Remove the BBC NO. 1 fuse from engine room relay block and junction block assembly.

    8. Remove the BBC NO. 2 fuse from engine room relay block and junction block assembly.

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-21 (STA) - ST relay terminal 2 Always Below 1 Ω
      A77-23 (STA2) - ST NO. 2 relay terminal 2 Always Below 1 Ω
      A77-21 (STA) or ST relay terminal 2 - Body ground Always 10 kΩ or higher
      A77-23 (STA2) or ST NO. 2 relay terminal 2 - Body ground Always 10 kΩ or higher
      A76-1 (BIN2) - A77-21 (STA) Always 10 kΩ or higher
      A76-3 (BIN1) - A77-21 (STA) Always 10 kΩ or higher
      A76-1 (BIN2) - A77-23 (STA2) Always 10 kΩ or higher
      A76-3 (BIN1) - A77-23 (STA2) Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK ENGINE STOP AND START ECU


    1. Disconnect the A77 engine stop and start ECU connector.

      A01W1H5E02
      Text in Illustration
      *a

      Component without harness connected

      (Engine Stop and Start ECU)

      		 - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-21 (STA) - A77-6 (DGND) Always 10 kΩ or higher
      A77-23 (STA2) - A77-6 (DGND) Always 10 kΩ or higher

    NG

    REPLACE ENGINE STOP AND START ECU Click here

    OK

  4. INSPECT RELAY (ST, ST NO. 2 RELAY)


    1. Inspect the ST relay Click here.

    2. Inspect the ST NO. 2 relay Click here.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE RELAY (ST, ST NO. 2 RELAY)