Engine does not Start: Procedure

CHECK IF ENGINE START (INITIALIZE STEERING LOCK)
1. Shift lever is in the P position.
2. Open and close the driver's door with the engine switch off. Check if the engine can be started.
  OK
  
  Engine can be started.
  
  HINT:
  
  After the battery is discharged and then recharged, the engine may not start unless the steering lock is initialized using the above procedure.
OK → END

NG: Go to next step
CHECK FOR DTC
1. Delete the DTCs, Refer to DTC CHECK / CLEAR .
2. Check for DTCs again.
  OK
  
  No DTC is output.
NG → GO TO DTC CHART

OK: Go to next step
CHECK SWITCH CONDITION
1. Check the engine start function.
  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
    
    Engine starts.
    
    HINT:
    - If power mode does not change to ON (IG and ACC), Refer to Power Source Mode does not Change to ON (IG and ACC) .
    - If power mode does not change to ON (IG), Refer to Power Source Mode does not Change to ON (IG) .
    - If power mode does not change to ON (ACC), Refer to Power Source Mode does not Change to ON (ACC) .
NG → PROCEED TO APPROPRIATE PROBLEM SYMPTOMS SHOWN IN PROBLEM SYMPTOMS TABLE

OK: Go to next step
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 crank the engine.
  2. M/T Models: When there is fuel in the tank and the key is inside the vehicle, check that depressing the clutch pedal and the brake pedal and pressing the engine switch crank the engine.
    OK
    
    Engine cranks.
NG → See step 18

OK: Go to next step

READ VALUE USING TECHSTREAM (STA SIGNAL)

Connect Techstream to the DLC3.
Turn the engine switch on (IG).

Check the result when the engine switch is turned on (IG) and the engine is started.

STANDARD:

Engine Switch Position	ON (IG)	ENGINE START
STARTED SIG	OFF	ON

ON (ENGINE START) and OFF (ENGINE SWITCH ON (IG)) appear on the screen.

OK → See step 12

NG: Go to next step

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

Connect Techstream to the DLC3.
Turn the engine switch on (IG).

Check the DATA LIST for proper functioning of the stop light switch.

BODY:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Stop Light SW	Stop light Switch 1/ ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

ON (brake pedal (A/T) or clutch pedal (M/T) depressed) and OFF (brake pedal (A/T) or clutch pedal (M/T) released) appear on the screen.

HINT:

If the result of the inspection for a tester display is not as specified, perform troubleshooting for DTC B2284 first, Refer to DTC B2284: Brake Signal Malfunction .

NG → GO TO DTC CHART

OK: Go to next step

READ VALUE USING TECHSTREAM (STEERING LOCK)

Connect Techstream to the DLC3.

Turn the engine switch on (IG).

BODY:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Steering Unlock Switch	Steering lock condition/ ON or OFF	ON: Steering is unlocked OFF: Steering is locked	-

ON (steering is unlocked) and OFF (steering is locked) appear on the screen.

NG → See step 22

OK: Go to next step

CHECK STEERING LOCK
1. Check if the steering lock is released when turning the engine switch on (ACC).
  OK
  
  The steering lock is released.
NG → GO TO STEERING LOCK SYSTEM

OK: Go to next step

INSPECT ECM (STAR AND STSW VOLTAGE)

Measure the voltage of the A5 and E4 ECM connectors while cranking the engine.

Fig 1: Inspecting ECM (STAR & STSW Voltage)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage

Tester Connection	Specified Condition
STAR (E4-4) - E1 (E4-7)	9 to 14 V
STSW (A5-19) - E1 (E4-7)	9 to 14 V

Result

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

B → REPLACE ECM

C → See step 16

A: Go to next step

INSPECT RELAY (ST CUT)

Remove the ST CUT relay from the engine room J/B and R/B No. 2.

Fig 2: View Of Relay Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the ST CUT relay.

Standard resistance

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

NG → REPLACE RELAY

OK: Go to next step

INSPECT PARK/NEUTRAL POSITION SWITCH (A/T) OR CLUTCH START SWITCH (M/T)

Disconnect the park/neutral position (PNP) switch (A/T) or clutch switch (M/T) connector.

Fig 3: Identifying PNP Switch (A/T) And Clutch Switch (M/T) Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance between each terminal shown below when the shift lever is moved to each range.

Standard resistance (A/T)

Shift Position	Tester Connection	Specified Condition
P	4 - 5	Below 1 Ω
N	4 - 5	Below 1 Ω
Except N or P	4 - 5	10 kΩ or higher

Standard resistance (M/T)

Clutch Pedal Operation	Tester Connection	Specified Condition
Depressed	1 - 2	Below 1 Ω
Released	1 - 2	10 kΩ or higher

NG → REPLACE PNP SWITCH (A/T) OR CLUTCH START SWITCH (M/T)

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

INSPECT RELAY (STARTER)

Remove the starter relay from the engine room J/B and R/B No. 1.

Fig 4: View Of Relay Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the starter relay.

Standard resistance

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

NG → REPLACE RELAY

OK: Go to next step

CHECK HARNESS AND CONNECTOR (PNP SWITCH (A/T) OR CLUTCH START SWITCH (M/T) - ST RELAY)

Check the harness and the connectors between the park/neutral position switch and the starter relay.

Fig 5: Identifying E45 PNP Switch (A/T), A24 Clutch Start Switch (M/T) And ST Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the E45*1 or A24*2 switch connector.
*1: A/T

*2: M/T
Remove the starter relay from the engine room J/B and R/B No. 1.

Measure the resistance of the wire harness side connectors.

Standard resistance (A/T) (Check for open)

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

Standard resistance (M/T) (Check for open)

Tester Connection	Specified Condition
Clutch start switch (A24-2) - Starter relay (1)	Below 1 Ω

Standard resistance (A/T) (Check for short)

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

Standard resistance (M/T) (Check for short)

Tester Connection	Specified Condition
Clutch start switch (A24-2) or Starter relay (1) - Body ground	10 kΩ or higher

Check the harness and the connector between the starter relay and the body ground.

Remove the starter relay from the engine room J/B and R/B No. 1.

Measure the resistance of the starter relay and the body ground.

Standard resistance (Check for open)

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT ENGINE ROOM RELAY BLOCK (STARTER RELAY VOLTAGE)

Remove the starter relay from the engine room J/B and R/B No. 1.

Fig 6: Identifying Starter Relay
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the engine room J/B and R/B No. 1 and the body ground.

Standard voltage

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT STARTER ASSEMBLY
HINT:

Refer to INSPECTION .

NG → REPAIR OR REPLACE STARTER ASSEMBLY

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

CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ECM)

Check the harness and the connectors between the power source control ECU and ECM.

Fig 7: Identifying J45 Power Source Control ECU And A5 ECM Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the power source control ECU connector.
Disconnect the A5 ECM connector.

Measure the resistance of the wire harness side connectors.

Standard resistance (Check for open)

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

Standard resistance (Check for short)

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK AND REPLACE POWER SOURCE CONTROL ECU
1. Replace the power source control ECU.
2. 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 crank the engine.
  2. M/T Models: When there is fuel in the tank and the key is inside the vehicle, check that depressing the clutch pedal and the brake pedal and pressing the engine switch crank the engine.
    OK
    
    Engine cranks.
    
    HINT:
    
    After the power source control ECU is replaced, the engine may not start unless each system is initialized using the above procedure.
NG → REPLACE ECM

OK → END

READ VALUE USING TECHSTREAM (L CODE)

Reconnect the connectors.
Connect Techstream to the DLC3.

Turn the engine switch on (IG).

SMART ACCESS:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
L Code Check	L code check/ ON or NG	OK: Normal NG: Malfunction	Electrical key in the cabin

OK is displayed on the screen.

HINT:

If the result of the inspection for a tester display is not as specified, there may be malfunction of the steering lock ECU or the ID code box.

NG → GO TO ENGINE IMMOBILISER SYSTEM

OK: Go to next step

READ VALUE USING TECHSTREAM (ENGINE START REQUEST)

Connect Techstream to the DLC3.

Turn the engine switch on (IG).

SMART ACCESS:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Starter Request Signal	Start request signal response/ OK or NG	OK: Received NG: Non-received	-

OK (received) and NG (non-received) appear on the screen.

NG → REPLACE CERTIFICATION ECU

OK: Go to next step

READ VALUE USING TECHSTREAM (S CODE)

Connect Techstream to the DLC3.

Turn the engine switch on (IG).

SMART ACCESS:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
S Code Check	S code check/ OK or NG	OK: Normal NG: Malfunction	-

OK is displayed on the screen.

HINT:

If the result of the inspection for a tester display is not as specified, there may be malfunction of the certification ECU or the ID code box.

NG → GO TO ENGINE IMMOBILISER SYSTEM

OK: Go to next step

INSPECT ID CODE BOX

Check the input signal waveform.

Fig 8: Inspecting ID Code Box

Connect the oscilloscope to the terminals J69-6 (EFIO) and A6-6 (IMI).
Turn the engine switch on (IG).

Check the signal waveform according to the condition(s) in the table below.

Item	Condition
Tool setting	10 V/DIV., 100 ms./DIV.
Vehicle condition	Engine switch on (IG)

NG → REPLACE ID CODE BOX

OK → END

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - STEERING LOCK ECU)

Disconnect the ECU connector.

Fig 9: Identifying J55 Power Source Control ECU And J29 Steering Lock ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection (Symbols)	Specified Condition
J55-26 (SLP) - J29-4 (SLP1)	Below 1 Ω
J55-26 (SLP) or J29-4 (SLP1) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT POWER SOURCE CONTROL ECU

Reconnect the J55 ECU connector.

Fig 10: Identifying Terminal SLP Of J55 Power Source Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.

Fig 11: Waveform Graph

Item	Contents
Terminal (Symbols)	J55-26 (SLP) - Body ground
Equipment Setting	2 V/DIV., 100 ms./DIV.
Condition	Engine switch on (IG)

The waveform appears as shown in the illustration.

HINT:

The waveform varies depending on the contents of communication.

NG → REPLACE POWER SOURCE CONTROL ECU

OK: Go to next step

INSPECT STEERING LOCK ECU

Reconnect the J29 ECU connector.

Fig 12: Identifying Terminal SLP Of J55 Power Source Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect the oscilloscope to the power source control ECU terminals specified in the table below and check the waveform.

Fig 13: Identifying Waveform

Item	Contents
Terminal (Symbols)	J55-26 (SLP) - Body ground
Equipment Setting	2 V/DIV., 100 ms./DIV.
Condition	Steering is LOCK / UNLOCK

The waveform appears as shown in the illustration.

HINT:

The waveform varies depending on the contents of communication.

NG → REPLACE STEERING LOCK ECU

OK → REPLACE POWER SOURCE CONTROL ECU