Cranking Holding Function Circuit: Wiring Diagram

1. When turning the engine switch to start, check whether the starter motor starts.

OK : CHECK FOR INTERMITTENT PROBLEMS 

NG : GO TO NEXT STEP. 

1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
2. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STARTER SIG.
3. Confirm the starter signal status when the engine switch is operated.

   OK: 

   ENGINE SWITCH POSITION SPECIFICATIONS
   
   

   Engine Switch Position	STARTER SIG
   On (IG)	OFF
   Start	ON

OK : Go to step   6 

NG : GO TO NEXT STEP. 

1. Measure the voltage of the A6 and E7 ECM connectors.
   Fig 3: Measuring Voltage Of A6 And E7 ECM Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   A6-19 (STSW) - E7-7 (E1)	9 to 14 V
   E7-4 (STAR) - E7-7 (E1)	9 to 14 V

   Result 

   VOLTAGE SPECIFICATIONS
   
   

   Terminal STSW	Terminal STAR	Proceed to
   9 to 14 V	9 to 14 V	A
   9 to 14 V	0 V	B
   0 V	0 V	C

B : REPLACE ECM 

C : Go to step   10 

A : GO TO NEXT STEP. 

1. Remove the starter cut relay from engine room No. 2 relay block.
2. Measure the resistance of the relay.
   Fig 4: Measuring Resistance Of Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   3-5	10 kΩ or higher
   3-5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG : REPLACE RELAY 

OK : GO TO NEXT STEP. 

1. Move the shift lever to the P or N position.
2. Disconnect the E25 PNP switch connector.
3. Measure the resistance of the PNP switch.
   Fig 5: Measuring Resistance Of PNP Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Shift Position	Tester Connection	Specified Condition
   P or N	9 - 6	Below 1 Ω

NG : REPLACE PARK/NEUTRAL POSITION SWITCH 

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

1. Remove the starter relay from engine room No. 1 relay block.
2. Measure the resistance of the relay.
   Fig 6: Identifying Starter Relay From Engine Room Relay Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG : REPLACE RELAY 

OK : GO TO NEXT STEP. 

1. Check the wire harness between the PNP switch and starter relay.
   1. Disconnect the E25 PNP switch connector.
   2. Remove the starter relay from the engine room No. 1 relay block.
   3. Measure the resistance of the wire harness side connectors.
      Fig 7: Measuring Resistance Of Wire Harness Side Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      E25-6 (PNP switch) - Relay block starter relay terminal 1	Below 1 Ω
      E25-6 (PNP switch) - Relay block starter relay terminal 1 - Body ground	10 kΩ or higher

2. Check the wire harness between the starter relay and body ground.
   1. Remove the starter relay from the engine room No. 1 relay block.
   2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART
      
      

      Tester Connection	Specified Condition
      Relay block starter relay terminal 2 - Body ground	Below 1 Ω

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : GO TO NEXT STEP. 

1. Remove the starter relay from the engine room No. 1 relay block.
2. Measure the resistance of the wire harness side connector.
   Fig 8: Measuring Resistance Of Wire Harness Side Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   Relay block starter relay terminal 5 - Body ground	9 to 14 V

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : GO TO NEXT STEP. 

NG : REPAIR OR REPLACE STARTER 

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

1. Disconnect the A6 ECM connector.
2. Disconnect the K73 ECU connector.
3. Measure the resistance of the wire harness side connectors.
   Fig 9: Identifying K73 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION AND SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   A6-19 (STSW) - K73-39 (STSW)	Below 1 Ω
   A6-19 (STSW) or K73-39 (STSW) - Body ground	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : INSPECT STARTING SYSTEM