DTC    P0562    System Voltage Low


DESCRIPTION

This description and the following Inspection Procedure are for DTC P0562 which is stored in the engine stop and start ECU. The engine stop and start ECU monitors the +B terminal voltage while the generator is not generating power (the engine is stopped due to Stop and Start system control). If the voltage is low, this DTC will be stored.

DTC No.
DTC Detection Condition
Trouble Area
P0562
All of the following conditions continue for 2 seconds or more (1 trip detection logic):
  1. +B terminal voltage 9 V or less.
  2. Vehicle stopped while idling.
  1. Battery
  2. Harness or connector
  3. Engine stop and start ECU

HINT:
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).


After troubleshooting, perform the following steps to recheck for DTCs and check if the Stop and Start system operates normally.

HINT:
  1. If the ECM learned values have been cleared by disconnecting the battery or for another reason, Stop and Start system control will be prohibited until ECM learning completes.
  2. Allow the engine to idle for 3 minutes after the engine warms up and check that the engine speed is within 50 rpm of the target idle speed.

  1. Connect the intelligent tester to the DLC3.

  2. Clear the DTCs (Click here).

  3. Start the engine and warm it up.

  4. Drive the vehicle at 20 km/h (12.4 mph) or more.

  5. Stop the vehicle, allow the engine to stop due to Stop and Start system control and wait for 3 seconds or more.

  6. Depress the clutch pedal to allow the engine to restart.

    HINT:
    If the engine cranks slowly when the engine is restarted, it can be determined that battery voltage is low.

  7. Check that no DTCs are output (Click here).


Check if the Stop and Start system operates normally.

HINT:
If the battery terminal has been disconnected, the ECO OFF indicator will be illuminated. In this case, drive the vehicle for 15 to 40 minutes to turn off the indicator.

  1. Warm up the engine.

  2. Turn the air conditioning system off.

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

  4. Stop the vehicle. Move the shift lever to neutral and release the clutch pedal.

  5. Check that the engine stops.

  6. Depress the clutch pedal and check that the engine restarts.


WIRING DIAGRAM


A217709E01


INSPECTION PROCEDURE

NOTICE:
  1. If the engine stop and start ECU is being replaced, register the previously recorded number of starter operations into the new engine stop and start ECU (Click here).
  2. After the engine stop and start ECU is replaced or after an air conditioner kit is installed, clear the A/C information stored in the engine stop and start ECU (Click here).
  3. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.READ VALUE USING INTELLIGENT TESTER (BATTERY VOLTAGE)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

    HINT:
    Do not start the engine.

  1. Turn the tester on.

  1. Turn off all electrical systems.

  1. Enter the following menus: Powertrain / Stop and Start / Data List / Battery Voltage.

  1. Read the battery voltage displayed on the tester screen.
    Result 
    Result
    		Proceed to
    4 to 14 V
    		A
    Below 4 V
    		B



B
Go to step 2
A

CHECK BATTERY AND CHARGING SYSTEM (Click here)  

2.INSPECT INTEGRATION NO.1 RELAY (EFI RELAY)


    A200843E02

  1. Remove the integration relay from the No. 1 engine room relay block.

  1. Disconnect the integration relay connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1A-1 - 1C-1
    		Battery voltage not applied
    		10 kΩ or higher
    Battery voltage applied to terminals 1B-2 and 1C-3
    		Below 1 Ω

    Text in Illustration 
    *1
    		Component without harness connected:
    (Integration Relay)

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



NG
REPLACE INTEGRATION NO.1 RELAY
OK


3.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)

  1. Remove the integration relay from the No. 1 engine room relay block.

  1. Disconnect the integration relay connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1C-3 - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ENGINE STOP AND START ECU)

  1. Disconnect the engine stop and start ECU connector.

  1. Remove the integration relay from the No. 1 engine room relay block.

  1. Disconnect the integration relay connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1C-1 (integration relay) - D79-6 (+B)
    		Always
    		Below 1 Ω
    1C-1 (integration relay) - Body ground
    		Always
    		10 kΩ or higher
    D79-6 (+B) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the engine stop and start ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND)

  1. Disconnect the engine stop and start ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D78-6 (E1) - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the engine stop and start ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ENGINE STOP AND START ECU (Click here)