Ecd System Cranking Holding Function Circuit

Двигатель. Toyota Rav4. Aca30, 33, 38 Ala30
Система Управления Двигателем 2Ad-Ftv. Toyota Rav4. Aca30, 33, 38 Ala30

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

CHECK ECM (STSW TERMINAL VOLTAGE)

CHECK ECM (STAR OUTPUT VOLTAGE)

INSPECT CLUTCH START SWITCH

CHECK WIRE HARNESS (ECM - MAIN BODY ECU)

INSPECT ST CUT RELAY

CHECK ST CUT RELAY (RELAY HOLDER TERMINAL VOLTAGE)

CHECK WIRE HARNESS (ECM - CLUTCH START SWITCH - MAIN BODY ECU)

CHECK NO. 7 RELAY BLOCK (CHECK FOR SHORT)

CHECK WIRE HARNESS (CLUTCH START SWITCH - ECM - ST RELAY)

INSPECT BATTERY

CHECK BATTERY TERMINAL

ECD SYSTEM - Cranking Holding Function Circuit


DESCRIPTION

The cranking holding control system keeps energizing the ST relay after the ECM detects the starter signal (STSW signal) from the main body ECU until the ECM performs a judgment of "Engine started". Furthermore, the ECM outputs an accessory cut signal (ACCR signal) to the ACC relay during cranking to prevent flickering of the combination meter, clock, audio system, and other areas.
When the ECM detects the STSW signal, the ECM outputs the starter relay drive signal (STAR signal) to the starter relay through the clutch start switch, and then the engine is cranked. When the ECM receives a stable engine speed signal (NE signal) (more specifically, when the NE signal reaches a predetermined value), the ECM stops outputting the STAR signal. Also, the ECM monitors the ST relay operating conditions based on the STA terminal voltage status.

Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit


WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit


INSPECTION PROCEDURE

ПРИМЕЧАНИЕ:
Perform electronic throttle learning after replacing the ECM (see page RAV4_ACA30 RM000000UZ301KX.html).
1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Enter the following menu items: Powertrain / Engine and ECT / Data List / Starter Signal.

  1. Check the result when the ignition switch is turned on (IG).

  1. Check the result when the engine starts.

    OK:
    Ignition Switch Condition
    		Tester Display (Starter Signal)
    On (IG)
    		OFF
    Engine starts
    		ON


OK
Перейдите к шагу 10
NG


2.CHECK ECM (STSW TERMINAL VOLTAGE)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Disconnect the A12 ECM connector.

  1. Depress the clutch pedal fully.

  1. Measure the voltage of the ECM terminal and the body ground when operating the ignition switch to start cranking.

    Standard voltage:
    Tester Connection
    		Specified Condition
    A12-9 (STSW) - Body ground
    		10 to 14 V

  1. Reconnect the ECM connector.



NG
Перейдите к шагу 5
OK


3.CHECK ECM (STAR OUTPUT VOLTAGE)


    Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Disconnect the A4 clutch start switch connector.

  1. Measure the voltage of the terminal of clutch start switch connector and the body ground while cranking the engine.

    Standard voltage:
    Tester Connection
    		Specified Condition
    A4-2 - Body ground
    		10 to 14 V

  1. Reconnect the clutch start switch connector.



NG
Перейдите к шагу 6
OK


4.INSPECT CLUTCH START SWITCH
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Disconnect the A4 clutch start switch connector.

  1. Measure the resistance of the terminals of the clutch start switch connector.

    Standard resistance:
    Switch Condition
    		Specified Condition
    Pushed
    		Below 1 Ω
    Not pushed
    		10 kΩ or higher

  1. Reconnect the clutch start switch connector.



OK
Перейдите к шагу 10
NG

REPLACE CLUTCH START SWITCH

5.CHECK WIRE HARNESS (ECM - MAIN BODY ECU)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Disconnect the E20 main body ECU connector.

  1. Disconnect the A12 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E20-4 (STSW) - A12-9 (STSW )
    		Below 1 Ω
    E20-4 (STSW) - Body ground
    		10 kΩ or higher

  1. Reconnect the main body ECU connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

CHECK ENTRY AND START SYSTEM

6.INSPECT ST CUT RELAY
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the No. 7 relay block.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 5
    		10 kΩ or higher
    3 - 5
    		Below 1 Ω
    (When battery voltage applied to terminals 1 and 2)

  1. Reinstall the relay.



NG
REPLACE ST CUT RELAY
OK


7.CHECK ST CUT RELAY (RELAY HOLDER TERMINAL VOLTAGE)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the No. 7 relay block.

  1. Turn the ignition switch on (IG).

  1. Measure the voltage of the terminals of the ST CUT relay holder.

    Standard voltage:
    Tester Connection
    		Specified Condition
    1 - 2
    		10 to 14 V

  1. Reinstall the relay.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


8.CHECK WIRE HARNESS (ECM - CLUTCH START SWITCH - MAIN BODY ECU)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the No. 7 relay block.

  1. Disconnect the A4 clutch start switch connector.

  1. Disconnect the E20 main body ECU connector.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    ST CUT relay terminal 3 - B32-53 (STAR)
    		Below 1 Ω
    ST CUT relay terminal 3 - E20-14 (STR2)
    		Below 1 Ω
    E20-3 (STR) - ST CUT relay terminal 5
    		Below 1 Ω
    A4-2 - ST CUT relay terminal 5
    		Below 1 Ω
    ST CUT relay terminal 3 - Body ground
    		10 kΩ or higher
    ST CUT relay terminal 5 - Body ground
    		10 kΩ or higher

  1. Reinstall the ST CUT relay.

  1. Reconnect the clutch start switch connector.

  1. Reconnect the main body ECU connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


9.CHECK NO. 7 RELAY BLOCK (CHECK FOR SHORT)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Remove the ST CUT relay from the No. 7 relay block.

  1. Disconnect the B32 ECM connector.

  1. Measure the resistance of the terminals of the ST CUT relay holder.

    Standard resistance:
    Tester Connection
    		Specified Condition
    No. 7 Relay block ST CUT relay terminal 3 - Body ground
    		10 kΩ or higher
    No. 7 Relay block ST CUT relay terminal 5 - Body ground
    		10 kΩ or higher

  1. Reinstall the ST CUT relay.

  1. Reconnect the ECM connector.



NG
CHECK ENTRY AND START SYSTEM
OK

REPLACE ECM

10.CHECK WIRE HARNESS (CLUTCH START SWITCH - ECM - ST RELAY)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Ad-Ftv.Система Ecd.Ecd System Cranking Holding Function Circuit

  1. Remove the ST relay from the No. 8 relay block.

  1. Disconnect the A4 clutch start switch connector.

  1. Disconnect the A12 ECM connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A4-1 - A12-43 (STA)
    		Below 1 Ω
    A4-1 - ST relay terminal 1
    		Below 1 Ω
    ST relay terminal 2 - Body ground
    		Below 1 Ω
    A4-1 - Body ground
    		10 kΩ or higher

  1. Reinstall the ST relay.

  1. Reconnect the clutch start switch connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


11.INSPECT BATTERY

  1. Check that the battery is not depleted.

    OK:
    Battery is not depleted.


NG
REPLACE BATTERY
OK


12.CHECK BATTERY TERMINAL

  1. Check that the battery terminals are not loose or corroded.

    OK:
    Battery terminals are not loose or corroded.


NG
REPAIR OR REPLACE BATTERY TERMINAL
OK

CHECK AND REPLACE STARTER POWER SOURCE CIRCUIT