Engine Does Not Start: Procedure

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 

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 → See step   3 

OK → END 

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 

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 → See step   5 

OK → GO TO ENGINE IMMOBILISER 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 

Fig 1: Identifying Terminals Of K73 Power Source Control ECU And E77 Of PNP Switch Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K73 ECU connector.
2. Disconnect the E77 switch connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   K73-17 (STR1) - E77-4	Below 1 Ω
   K73-17 (STR1) or E77-4 - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   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

   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 

OK: Go to next step 

Fig 3: Identifying Terminals Of K73 Power Source Control ECU And A6 Of ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K73 ECU connector.
2. Disconnect the A6 ECM connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   K73-28 (SKSW) - A6-31 (KSW)	Below 1 Ω
   K73-28 (SKSW) or A6-31 (KSW) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

Fig 4: Identifying Power Source Control ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Reconnect the K73 ECU connector.
2. Measure the voltage of the ECU.

   Standard voltage

   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