Sfi System Starter Signal Circuit

Engine Hybrid System. Corolla. Zre142 Aze141
2Az-Fe Engine Control. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING TECHSTREAM (STARTER SIGNAL)

INSPECT RELAY (ST RELAY)

CHECK HARNESS AND CONNECTOR (ST RELAY - ECM)

CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER)

INSPECT IGNITION SWITCH

CHECK HARNESS AND CONNECTOR (ST RELAY - IGNITION SWITCH)

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - BATTERY)

CHECK HARNESS AND CONNECTOR (STARTER - BATTERY)

INSPECT IGNITION SWITCH

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - BATTERY)

INSPECT PARK/NEUTRAL POSITION SWITCH

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM AND ST RELAY)

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - IGNITION SWITCH AND ECM)

INSPECT CLUTCH PEDAL SWITCH

CHECK HARNESS AND CONNECTOR (CLUTCH PEDAL SWITCH - ECM AND ST RELAY)

CHECK HARNESS AND CONNECTOR (CLUTCH PEDAL SWITCH - IGNITION SWITCH)

SFI SYSTEM - Starter Signal Circuit


DESCRIPTION

While the engine is being cranked, current flows from terminal ST1 of the ignition switch to the park/neutral position switch assembly (automatic transaxle models) or clutch pedal switch assembly (manual transaxle models) and also flows to terminal STA of the ECM (STA Signal).

WIRING DIAGRAM


Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.Sfi System Starter Signal Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.READ VALUE USING TECHSTREAM (STARTER SIGNAL)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. Move the shift lever to P or N (for automatic transaxle models).

  1. Fully depress the clutch pedal (for manual transaxle models).

  1. Check the result when the ignition switch is turned to ON and START.

    OK:

    Ignition Switch Position
    		Starter Signal
    ON
    		OFF (Starter signal off)
    START
    		ON (Starter signal on)


NG
Go to step 10
OK


2.INSPECT RELAY (ST RELAY)

  1. Inspect the ST relay (COROLLA_ZRE142 RM000003D39009X.html).



NG
REPLACE RELAY (ST RELAY)
OK


3.CHECK HARNESS AND CONNECTOR (ST RELAY - ECM)

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

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    ST relay terminal 2 - A50-48 (STA)
    		Always
    		Below 1 Ω

  1. Reconnect the ECM connector.

  1. Reinstall the ST relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM)
OK


4.CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

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

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    ST relay terminal 1 - Body ground
    		Always
    		Below 1 Ω

  1. Reinstall the ST relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BODY GROUND)
OK


5.CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER)

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

  1. Disconnect the starter connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    ST relay terminal 3 - B8-1
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    ST relay terminal 3 or B8-1 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the starter connector.

  1. Reinstall the ST relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - STARTER)
OK


6.INSPECT IGNITION SWITCH

  1. Inspect the ignition switch (COROLLA_ZRE142 RM0000026VF01LX.html).



NG
REPLACE IGNITION SWITCH (COROLLA_ZRE142 RM0000034SW00YX.html)
OK


7.CHECK HARNESS AND CONNECTOR (ST RELAY - IGNITION SWITCH)

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

  1. Disconnect the ignition switch connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    ST relay terminal 5 - E4-8 (ST2)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    ST relay terminal 5 or E4-8 (ST2) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ignition switch connector.

  1. Reinstall the ST relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - IGNITION SWITCH)
OK


8.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - BATTERY)

  1. Disconnect the cable from the negative (-) battery terminal.

  1. Disconnect the cable from the positive (+) battery terminal.

  1. Disconnect the ignition switch connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    E4-7 (AM2) - Positive (+) battery terminal
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    E4-7 (AM2) or Positive (+) battery terminal - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ignition switch connector.

  1. Reconnect the cable to the positive (+) battery terminal.

  1. Reconnect the cable to the negative (-) battery terminal.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY)
OK


9.CHECK HARNESS AND CONNECTOR (STARTER - BATTERY)

  1. Disconnect the cable from the negative (-) battery terminal.

  1. Disconnect the cable from the positive (+) battery terminal.

  1. Disconnect the starter connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    B4-1 - Positive (+) battery terminal
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    B4-1 or Positive (+) battery terminal - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the starter connector.

  1. Reconnect the cable to the positive (+) battery terminal.

  1. Reconnect the cable to the negative (-) battery terminal.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER - BATTERY)
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM000000PDG0P4X.html)

10.INSPECT IGNITION SWITCH

  1. Inspect the ignition switch (COROLLA_ZRE142 RM0000026VF01LX.html).



NG
REPLACE IGNITION SWITCH (COROLLA_ZRE142 RM0000034SW00YX.html)
OK


11.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - BATTERY)

  1. Disconnect the cable from the negative (-) battery terminal.

  1. Disconnect the cable from the positive (+) battery terminal.

  1. Disconnect the ignition switch connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    E4-2 (AM1) - Positive (+) battery terminal
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    E4-2 (AM1) or Positive (+) battery terminal - Body ground
    		Always
    		10 kΩ or higher

    Result:

    Result
    		Proceed to
    OK (for automatic transaxle models)
    		A
    OK (for manual transaxle models)
    		B
    NG
    		C

  1. Reconnect the ignition switch connector.

  1. Reconnect the cable to the positive (+) battery terminal.

  1. Reconnect the cable to the negative (-) battery terminal.



B
Go to step 15

C
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY)
A


12.INSPECT PARK/NEUTRAL POSITION SWITCH

  1. Inspect the park/neutral position switch (COROLLA_ZRE142 RM000000YWQ011X.html).



NG
REPLACE PARK/NEUTRAL POSITION SWITCH (COROLLA_ZRE142 RM000001CUJ00VX.html)
OK


13.CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM AND ST RELAY)

  1. Disconnect the park/neutral position switch assembly connector.

  1. Disconnect the ECM connector.

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

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    B88-5 - A50-48 (STA)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    B88-5, A50-48 (STA) or ST relay terminal 2 - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the ST relay.

  1. Reconnect the ECM connector.

  1. Reconnect the park/neutral position switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM AND/OR ST RELAY)
OK


14.CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - IGNITION SWITCH AND ECM)

  1. Disconnect the park/neutral position switch connector.

  1. Disconnect the ignition switch connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    B88-4 - E4-1 (ST1)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    B88-4, E4-1 (ST1) or B31-52 (NSW) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the ignition switch assembly connector.

  1. Reconnect the park/neutral position switch assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - IGNITION SWITCH AND/OR ECM)
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)

15.INSPECT CLUTCH PEDAL SWITCH

  1. Inspect the clutch pedal switch (COROLLA_ZRE142 RM00000241M01MX.html).



NG
REPLACE CLUTCH PEDAL SWITCH (COROLLA_ZRE142 RM00000241P01LX.html)
OK


16.CHECK HARNESS AND CONNECTOR (CLUTCH PEDAL SWITCH - ECM AND ST RELAY)

  1. Disconnect the clutch pedal switch connector.

  1. Disconnect the ECM connector.

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

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    A5-1 - A50-48 (STA)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    A5-1, A50-48 (STA) or ST relay terminal 2 - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the ST relay.

  1. Reconnect the ECM connector.

  1. Reconnect the clutch pedal switch connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (CLUTCH PEDAL SWITCH - ECM AND/OR ST RELAY)
OK


17.CHECK HARNESS AND CONNECTOR (CLUTCH PEDAL SWITCH - IGNITION SWITCH)

  1. Disconnect the clutch pedal switch connector.

  1. Disconnect the ignition switch connector.

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

    Standard Resistance (Check for Open):

    Tester Connection
    		Condition
    		Specified Condition
    A5-2 - E4-1 (ST1)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):

    Tester Connection
    		Condition
    		Specified Condition
    A5-2 or E4-1 (ST1) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the clutch pedal switch connector.

  1. Reconnect the ignition switch connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (CLUTCH PEDAL SWITCH - IGNITION SWITCH)
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)