ECD SYSTEM Starter Signal Circuit

DESCRIPTION

When the engine is being cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore necessary in order to achieve good start ability. While the engine is being cranked, the battery positive voltage is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection volume for the starting injection control and after-start injection control.

WIRING DIAGRAM

A01KFMHE01

INSPECTION PROCEDURE

Tech Tips


  • This diagnostic chart is based on the premise that the engine is being cranked under normal conditions. If the engine does not crank, proceed to the problem symptoms table on page Click here.

  • When not using the intelligent tester go to step 4.

PROCEDURE


  1. READ VALUE OF INTELLIGENT TESTER (CHECK STA SIGNAL)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and push the intelligent tester main switch ON.

    3. Read the STA signal on the intelligent tester while the starter operates.

      Result
      Ignition Switch Position ON STA
      STA Signal OFF ON

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE Click here

    NG

  2. CHECK FUSE (ST NO. 2)


    1. A01KERVE01

      Remove the ST NO.2 fuse from the R/B No. 2.

    2. Check continuity of ST NO. 2 fuse.

      Result
      Continuity

    NG

    REPLACE FUSE

    OK

  3. CHECK WIRE HARNESS (ECM - STARTER RELAY)


    1. A01KHM5E01

      Disconnect the starter relay.

    2. Disconnect the ECM (E10) connector.

    3. Check the continuity between terminals of the starter relay (1) of the R/B No. 2 and ECM connector as shown in the illustration and table.

      Continuity (Check for open)

      Terminal

      (Starter relay of R/B No. 2 ←→ ECM)

      		 Standard
      3 ←→ STA (E10-15) Continuity
      Continuity (Check for short)

      Terminal

      (ECM ←→ ECM(Ground))

      		 Standard
      STA (E10-15) ←→ E1 (E7-22) No continuity

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    CHECK AND REPLACE ECM Click here

  4. CHECK STARTER SIGNAL (CHECK VOLTAGE)


    1. A01KGF1E08

      Turn the ignition switch START.

    2. Check the voltage between terminals of the ECM connector as shown in the table and illustration.

      Voltage

      Terminal

      (Positive terminal ←→ Negative terminal)

      		 Voltage
      STA (E10-15) ←→ E1 (E7-22) 6.0 V or more

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE Click here

    NG

  5. CHECK FUSE (ST NO. 2)


    1. A01KERVE01

      Remove the ST NO.2 fuse from the R/B No. 2.

    2. Check continuity of ST NO. 2 fuse.

      Result
      Continuity

    NG

    REPLACE FUSE

    OK

  6. CHECK WIRE HARNESS (ECM - STARTER RELAY)


    1. A01KHM5E01

      Disconnect the starter relay.

    2. Disconnect the ECM (E10) connector.

    3. Check the continuity between terminals of the starter relay (1) of the R/B No. 2 and ECM connector as shown in the illustration and table.

      Continuity (Check for open)

      Terminal

      (Starter relay of R/B No. 2 ←→ ECM)

      		 Standard
      3 ←→ STA (E10-15) Continuity
      Continuity (Check for short)

      Terminal

      (ECM ←→ ECM(Ground))

      		 Standard
      STA (E10-15) ←→ E1 (E7-22) No continuity

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    CHECK AND REPLACE ECM Click here