Engine does not Start: Wiring Diagram

See CRANKING HOLDING FUNCTION CIRCUIT .

1. CHECK FOR DTC 
   1. Delete the DTCs.

      HINT:

      After all DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG).

   2. Check for DTCs again.

      OK: 

      No DTC is output. 

   NG : GO TO DTC CHART 

   OK : GO TO NEXT STEP. 

2. CHECK BASIC FUNCTION 
   1. When there is fuel in the fuel tank, the key is inside the vehicle and the shift lever is on P, check that depressing the brake pedal causes the engine to start.

      OK: 

      Engine starts. 

   NG : Go to step 3 

   OK : END 

3. CHECK SWITCH CONDITION 
   1. When the key is inside the vehicle and the shift lever is on P, check that depressing the brake pedal while pressing the engine switch causes the power source mode to change as follows.

      OK: 

      off --> on (ACC) --> on (IG) --> off 

   NG : GO TO POWER SOURCE MODE DOES NOT CHANGE 

   OK : GO TO NEXT STEP. 

4. CHECK BASIC FUNCTION 
   1. When there is fuel in the fuel tank, the key is inside the vehicle and the shift lever is on P, check that depressing the brake pedal and pressing the engine switch cranks the engine.

      OK: 

      Engine cranks. 

   NG: Go to step 5 

   OK : GO TO ENGINE IMMOBILIZER SYSTEM 

5. CHECK STEERING LOCK SYSTEM 
   1. When the engine switch is on (ACC), check that the steering lock can be released.

      OK: 

      Steering lock can be released. 

   NG : GO TO STEERING LOCK SYSTEM 

   OK : GO TO NEXT STEP. 

6. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - PNP SWITCH) 
   Fig 1: Identifying Wire Harness (Power Source Control ECU - PNP Switch)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the K73 ECU connector.
   2. Disconnect the E25 switch connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      STANDARD RESISTANCE DESCRIPTION
      
      

      Tester Connection	Specified Condition
      K73-17 (STR1) - E25-9	Below 1 Ω
      K73-17 (STR1) or E25-9 - Body ground	10 kΩ or higher

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK : GO TO NEXT STEP. 

7. CHECK WIRE HARNESS (ENGINE ROOM R/B NO. 2 - POWER SOURCE CONTROL ECU) 
   1. Remove the ST CUT relay from the engine room R/B No. 2.
   2. Disconnect the K73 ECU connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      STANDARD RESISTANCE DESCRIPTION
      
      

      Tester Connection	Specified Condition
      Engine room R/B No. 2 ST CUT relay terminal 3 - K73-15 (STR2)	Below 1 Ω
      Engine room R/B No. 2 ST CUT relay terminal 3 or K73-15 (STR2) - Body ground	10 kΩ or higher

      Standard resistance 

      STANDARD RESISTANCE DESCRIPTION
      
      

      Tester Connection	Specified Condition
      Engine room R/B No. 2 ST CUT relay terminal 2- K73-35 (IG2D)	Below 1 Ω
      Engine room R/B No. 2 ST CUT relay terminal 2 or K73-35 (IG2D) - Body ground	10 kΩ or higher

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   Fig 2: Identifying Wire Harness (Engine Room R/B No 2 - Power Source Control ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : GO TO NEXT STEP. 

8. CHECK POWER SOURCE CONTROL ECU 
   Fig 3: Identifying Power Source Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Reconnect the K73 ECU connector.
   2. Measure the voltage of the ECU.

      Standard voltage 

      STANDARD VOLTAGE DESCRIPTION
      
      

      Tester Connection	Condition	Specified Condition
      K73-39 (STSW) - Body ground	Engine switch on (IG)	10 to 14 V

   NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK : GO TO SFI SYSTEM