Engine does not Start: Wiring Diagram

See CRANKING HOLDING FUNCTION CIRCUIT .

1. CHECK FOR DTC 
   1. Delete the DTCs (See DIAGNOSIS SYSTEM  ).

      HINT:

      After all the 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. Check the engine start function.
      1. A/T Models: When there is fuel in the fuel tank, the key is inside the vehicle and the shift lever is in P, check that depressing the brake pedal causes the engine to start.
      2. M/T Models: When there is fuel in the tank, the key is inside the vehicle, check that depressing the clutch pedal and the brake pedal causes the engine to start.

      OK: Engine starts. 

   NG : Go to step 3 

   OK : END 

3. CHECK SWITCH CONDITION 
   1. Check the engine switch condition.
      1. A/T Models: When the key is inside the vehicle and the shift lever is in P, check that pressing the engine switch causes the power source mode to change as follows.
      2. M/T Models: When the key is inside the vehicle, check the brake pedal causes the engine to start.

      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. Check the engine cranking function.
      1. A/T Models: When there is fuel in the fuel tank, the key is inside the vehicle and the shift lever is in P, check that depressing the brake pedal and pressing the engine switch cranks the engine.
      2. M/T Models: When there is fuel in the tank, the key is inside the vehicle, check that depressing the clutch pedal and the brake pedal and pressing the engine switch cranks the engine.

      OK: Engine cranks. 

   NG : Go to step 5 

   OK : GO TO  ENGINE IMMOBILISER 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 OR CLUTCH START SWITCH) 
   Fig 1: Identifying J55 Power Source Control ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the J55 ECU connector.
   2. Disconnect the E45 or A24 switch connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection (Symbols)	Specified Condition
      J55-17 (STR1) - E45-4 (A/T)	Below 1 Ω
      J55-17 (STR1) - A24-1 (M/T)	Below 1 Ω
      J55-17 (STR1) or E45-4 - Body ground (A/T)	10 kΩ or higher
      J55-17 (STR1) or A24-1- Body ground (M/T)	10 kΩ or higher

   NG : REPAIR OR REPLACE HARNESS OR 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.
      Fig 2: Identifying J55 Power Source Control ECU Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Disconnect the J55 ECU connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection (Symbols)	Specified Condition
      Engine room R/B No. 2 ST CUT relay terminal 3 - J55-15 (STR2)	Below 1 Ω
      Engine room R/B No. 2 ST CUT relay terminal 3 or J55-15 (STR2) - Body ground	10 kΩ or higher
      Engine room R/B No. 2 ST CUT relay terminal 2- J55-35 (IG2D)	Below 1 Ω
      Engine room R/B No. 2 ST CUT relay terminal 2 or J55-35 (IG2D) - Body ground	10 kΩ or higher

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : GO TO NEXT STEP 

8. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM) 
   1. Disconnect the J55 ECU connector.
   2. Disconnect the A5 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection (Symbols)	Specified Condition
      J55-28 (SKSW) - A5-31 (KSW)	Below 1 Ω
      J55-28 (SKSW) or A5-31 (KSW) - Body ground	10 kΩ or higher

      Fig 3: Identifying J55 Power Source Control ECU Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : GO TO NEXT STEP 

9. CHECK POWER SOURCE CONTROL ECU 
   1. Reconnect the J55 ECU connector.
      Fig 4: Identifying Power Source Control ECU Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Measure the voltage of the ECU.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection (Symbols)	Condition	Specified Condition
      J55-39 (STSW) - Body ground	Engine switch on (IG)	10 to 14 V

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : GO TO  ENGINE CONTROL SYSTEM (2GR-FSE)