Cranking Holding Function Circuit: Procedure

1. When starting the engine, check whether the starter motor starts.

OK → CHECK FOR INTERMITTENT PROBLEMS 

NG: Go to next step 

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the tester on.
3. Enter the following menus: Powertrain / Engine / Active Test / Starter Signal.
4. Check the result when the engine switch is turned on (IG) and the engine is started.

   Standard

   Starter Signal	Engine Switch Position
   Close (Starter signal off)	On (IG)
   Open (Starter signal on)	Engine started

OK → See step   6 

NG: Go to next step 

1. Measure the voltage according to the value(s) in the table below while cranking the engine.
   Fig 1: Identifying ECM Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   STAR (E4-4) - E1 (E4-7)	Cranking	5.5 V or more
   STSW (A5-19) - E1 (E4-7)	Cranking	8 to 14 V

   Result

   Terminal STAR	Terminal STSW	Proceed to
   5.5 V or more	8 to 14 V	A
   0 V	8 to 14 V	B
   0 V	0 V	C

B → See step   11 

C → See step   10 

A: Go to next step 

1. Inspect the ST CUT relay. Refer to ON-VEHICLE INSPECTION .

NG → REPLACE ST CUT RELAY 

OK: Go to next step 

1. Inspect the park/neutral position switch assembly.
   • for 2WD. Refer to INSPECTION
   • for AWD. Refer to INSPECTION

NG → REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

OK → CHECK AND REPAIR HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM, ECM - ST CUT RELAY, ST) 

1. Inspect the STARTER relay. Refer to ON-VEHICLE INSPECTION .

NG → REPLACE STARTER RELAY 

OK: Go to next step 

1. Check the harness and the connectors between the park/neutral position switch and the starter relay.
   1. Disconnect the E45 park/neutral position switch connector.
   2. Remove the STARTER relay from the engine room R/B No. 1.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection	Specified Condition
      Park/Neutral position switch (E45-5) - STARTER relay (1)	Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection	Specified Condition
      Park/Neutral position switch (E45-5) or STARTER relay (1) - Body ground	10 kΩ or higher

   4. Reconnect the park/neutral position switch connector.
2. Check the harness and the connector between the starter relay and the body ground.
   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection	Specified Condition
      STARTER relay (2) - Body ground	Below 1 Ω

   2. Reinstall the STARTER relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the STARTER relay from the engine room R/B No. 1.
   Fig 2: Locating STARTER Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   STARTER relay (5) - Body ground	9 to 14 V

3. Reinstall the STARTER relay.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the starter assembly. Refer to INSPECTION .

NG → REPAIR OR REPLACE STARTER ASSEMBLY 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - STARTER, STARTER - BATTERY) 

1. Check the harness and the connectors between the power source control ECU and ECM.
   1. Disconnect the J55 power source control ECU connector.
   2. Disconnect the A5 ECM connector.
   3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection	Specified Condition
      STSW (J55-39) - STSW (A5-19)	Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection	Specified Condition
      STSW (J55-39) or STSW (A5-19) - Body ground	10 kΩ or higher

   4. Reconnect the ECM connector.
   5. Reconnect the power source control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START