Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Engine does not Start

DESCRIPTION

When the key is in the vehicle and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. In addition, when the shift lever is in P or N and the brake pedal is depressed, the engine can be started by pressing the engine switch.

HINT:

  • When the certification ECU (smart key ECU assembly) is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode changes to on (IG).
  • When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off an intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart key system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting.

    Click here Troubleshoot the smart key system (for Start Function) after confirming

    Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

  • If the smart key system is disabled through the customize function, enable the system before performing troubleshooting (See page Before replacing the certification ECU (smart key ECU assembly) or steering ).
  • Before replacing the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upr bracket assembly), refer to the smart key system (for Start Function) precaution (See page Inspect the fuses of circuits related to this system before performing ).
  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  • If the steering lock ECU (steering lock actuator or upr bracket assembly) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the engine. If the steering is locked for any reason, open and close a door with the engine switch off, and then unlock the steering by pressing the engine switch. This prevents the engine from starting while the steering is locked.
  • After completing repairs, confirm that the problem does not occur.
Related Data List and Active Test Items

Problem Symptom

Data List Item

Active Test Item

Engine does not start

Power Source Control
  • Stop Light Switch1
  • Steering Unlock Switch
  • Power Supply Condition
  • IG Relay Monitor(Inside)
  • IG Relay Monitor(Outside)
  • Latch Circuit
  • Shift P Signal
  • Neutral SW/ Clutch SW
  • Starter Request Signal
Smart Key
  • L Code Check
  • Engine Start Request
  • Immobiliser
Starting Control
  • Ignition
  • Starter SW
  • Shift Position P or N

-

HINT:

If the brake pedal is repeatedly depressed while the engine is stopped, the brake booster pressure is released and the force required to depress the brake pedal to illuminate the stop lights increases.

PROCEDURE

1.

CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) Press a switch of the electrical key transmitter sub-assembly.

OK:

The electrical key transmitter sub-assembly LED illuminates.

NG

GO TO STEP 11

OK

2.

READ VALUE USING TECHSTREAM (KEY LOW BATTERY)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Smart Key / Data List.

(e) Read the Data List according to the display on the Techstream.

Smart Key

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Key Low Battery

Transmitter battery depleted/Yes or No

YES: Transmitter battery depleted

NO: Transmitter battery not depleted

The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. The certification ECU (smart key ECU assembly) displays "YES" for the "Key Low Battery" item of the Data List when this voltage information indicates 2.2 V or less. This Data List item should be checked when the electrical key transmitter sub-assembly is at room temperature (example: at -20°C (-4°F), "YES" may be displayed even if the transmitter battery is new).

Result

Result

Proceed to

"NO" is displayed on the Techstream screen

A

"YES" is displayed on the Techstream screen

B

B

REPLACE TRANSMITTER BATTERY

A

3.

CHECK WAVE ENVIRONMENT

(a) If the problem occurs in certain locations or times of day, the possibility of wave interference is high.

HINT:

Whether the problem is due to wave interference can be checked by holding the electrical key transmitter sub-assembly near the electrical key and TPMS receiver assembly.

OK:

Engine starts.

Result

Result

Proceed to

NG

A

OK

B

B

AFFECTED BY WAVE INTERFERENCE

A

4.

CHECK ENGINE SWITCH CONDITION

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.

(c) With the brake pedal released, check that pressing the engine switch causes the power source mode to change.

Result

Result

Proceed to

Power source mode changes: Off → on (ACC) → on (IG) → off

A

Power source mode does not change to on (ACC) or on (IG)

B

Power source mode changes to on (IG) but not to on (ACC)

C

Power source mode changes to on (ACC) but not to on (IG)

D

B

GO TO POWER SOURCE MODE DOES NOT CHANGE TO ON (IG AND ACC)

C

GO TO POWER SOURCE MODE DOES NOT CHANGE TO ON (ACC)

D

GO TO POWER SOURCE MODE DOES NOT CHANGE TO ON (IG)

A

5.

READ VALUE USING TECHSTREAM (NEUTRAL SW / CLUTCH SW, SHIFT POSITION P OR N)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Power Source Control or Starting Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Power Source Control

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Neutral SW/ Clutch SW

Shift position (P and N)/ON or OFF

ON: Shift lever in P or N

OFF: Shift lever in any position other than P or N

  • Use this item to determine whether the park/neutral position switch is malfunctioning.
  • When the engine cannot be started due to a park/neutral position switch malfunction, OFF is displayed.
Starting Control

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Shift Position P or N

Park/neutral position switch status/ON or OFF

ON: Shift lever in P

OFF: Shift lever not in P

When malfunctioning, the engine will not crank.

OK:

The Techstream display changes correctly in response to the shift position.

NG

GO TO STEP 23

OK

6.

CHECK FOR DTC

(a) Using the Techstream, check for certification ECU (smart key ECU assembly) DTCs (See page Result ).

Result

Result

Proceed to

DTCs are not output

A

Smart key system (for Start Function) DTCs are output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

7.

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH1)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Power Source Control

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Stop Light Switch1

State of brake pedal/ON or OFF

ON: Brake pedal depressed

OFF: Brake pedal released

  • Use this item to determine whether the stop light switch is malfunctioning.
  • The engine cannot be started when this item is OFF.
  • If the stop light switch is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

OK:

The Techstream display changes correctly in response to the brake operation.

NG

GO TO STEP 21

OK

8.

READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Power Source Control

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Starter Request Signal

Engine start request signal status/ON or OFF

ON: With the shift lever in P and the brake pedal depressed, the engine switch is pressed and held

OFF: After approx. 1 second has elapsed, the engine switch is released

  • When the engine cannot be started due to a start request signal malfunction, OFF is displayed.
  • When the engine switch is pressed, the duration of time that ON is displayed will be extremely short. As such, the engine switch needs to be pressed and held for a certain period of time.

NOTICE:

Check that the key indicator is displayed on the multi-information display in the combination meter assembly, and then press the engine switch.

OK:

The Techstream display changes correctly in response to the engine switch operation.

NG

GO TO STEP 12

OK

9.

CHECK STEERING LOCK

(a) Check that the steering unlocks when the engine switch is turned on (ACC).

OK:

The steering unlocks.

NG

GO TO STEERING LOCK SYSTEM (UNABLE TO UNLOCK STEERING)

OK

10.

CHECK SECURITY INDICATOR LIGHT (IMMOBILISER SYSTEM UNSET)

(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.

(b) Move the shift lever to P.

(c) Press the engine switch with the brake pedal released and check that the security indicator light changes from blinking to off at the same time that the power source mode changes to on (ACC).

HINT:

The immobiliser function can be determined to be operating correctly if the security indicator light changes from blinking to off at the same time that the power source mode changes to on (ACC).

OK:

The security indicator light changes from blinking to off at the same time that power source mode changes to on (ACC).

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

GO TO IMMOBILISER SYSTEM (PROBLEM SYMPTOMS TABLE)

11.

INSPECT TRANSMITTER BATTERY

(a) Inspect the transmitter battery (See page ). ).

NOTICE:

Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. The terminal may be deformed or damaged, and the transmitter battery will not be able to be installed correctly.

OK

REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

NG

REPLACE TRANSMITTER BATTERY

12.

READ VALUE USING TECHSTREAM (STARTER SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Starting Control / Data List.

(e) Read the Data List according to the display on the Techstream.

(f) Get into the vehicle while carrying the electrical key transmitter sub-assembly, move the shift lever to P, press the engine switch while depressing the brake pedal and confirm that the Techstream display changes.

Starting Control

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Starter SW

Starter operation request/ON or OFF

ON: Starter operation requested

OFF: Starter operation not requested

When malfunctioning, the engine will not crank.

OK:

The Techstream display changes.

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

13.

INSPECT ST RELAY (STARTER RELAY ASSEMBLY)

(a) Inspect the ST relay (starter relay assembly) (See page ).

NG

REPLACE ST RELAY (STARTER RELAY ASSEMBLY)

OK

14.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - BODY GROUND)

(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the E13 ECM connector.

(c) Move the shift lever to P or N.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C27-10 (STAR) - Body ground

20°C (68°F)

107.05 to 116.33 Ω

C27-12 (STA) - Body ground

20°C (68°F)

106.78 to 115.98 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))

NG

GO TO STEP 17

OK

15.

INSPECT STARTER ASSEMBLY

(a) Remove the starter assembly (See page ). (b) Inspect the starter assembly (See page  ). ).

(b) Inspect the starter assembly (See page ).

NG

REPLACE STARTER ASSEMBLY

OK

16.

CHECK HARNESS AND CONNECTOR (BATTERY - STARTER ASSEMBLY AND ST RELAY (STARTER RELAY ASSEMBLY))

(a) Disconnect the S5 and S6 starter assembly connectors.

(b) Remove the ST relay (starter relay assembly) from the engine room relay block assembly.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

S5-1 - Body ground

Always

11 to 14 V

5 (ST relay (starter relay assembly)) - Body ground

Always

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (ST relay (starter relay assembly)) - S6-1

Always

Below 1 Ω

3 (ST relay (starter relay assembly)) or S6-1 - Body ground

Always

10 kΩ or higher

Text in Illustration

*a

Engine Room Relay Block

*b

ST Relay (Starter Relay Assembly) Holder

OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH)

(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the P1 park/neutral position switch connector.

(c) Disconnect the E13 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C27-10 (STAR) - P1-4 (B)

Always

Below 1 Ω

C27-10 (STAR) or P1-4 (B) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

18.

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST RELAY (STARTER RELAY ASSEMBLY))

(a) Disconnect the P1 park/neutral position switch connector.

(b) Remove the ST relay (starter relay assembly) from the engine room relay block assembly.

(c) Disconnect the E13 ECM connector.

(d) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

P1-5 (L) - 1 (ST relay (starter relay assembly))

Always

Below 1 Ω

P1-5 (L) or 1 (ST relay (starter relay assembly)) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

19.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY (STARTER RELAY ASSEMBLY))

(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Remove the ST relay (starter relay assembly) from the engine room relay block assembly.

(c) Disconnect the E13 ECM connector.

(d) Disconnect the P1 park/neutral position switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C27-12 (STA) - 1 (ST relay (starter relay assembly))

Always

Below 1 Ω

C27-12 (STA) or 1 (ST relay (starter relay assembly)) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

20.

CHECK HARNESS AND CONNECTOR (ST RELAY (STARTER RELAY ASSEMBLY - BODY GROUND))

(a) Remove the ST relay (starter relay assembly) from the engine room relay block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (ST relay (starter relay assembly)) - Body ground

Always

Below 1 Ω

OK

USE SIMULATION METHOD TO CHECK

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the S10 stop light switch assembly connector.

(c) Disconnect the E13 ECM connector.

(d) Disconnect the S7 transmission floor shift assembly connector.

(e) Disconnect the S1 skid control ECU (brake actuator assembly) connector.

(f) Disconnect the R38 rear combination light assembly LH connector.

(g) Disconnect the R39 rear combination light assembly RH connector.

(h) Disconnect the C15 center stop light assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

S10-2 - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C27-2 (STP1) - S10-1

Always

Below 1 Ω

C27-2 (STP1) or S10-1 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

22.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Inspect the stop light switch assembly (See page ).

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

23.

INSPECT PARK/NEUTRAL POSITION SWITCH

(a) Remove the park/neutral position switch.

for AC60E: (See page for AC60F: (See page  ) )

for AC60F: (See page (b) Inspect the park/neutral position switch. )

(b) Inspect the park/neutral position switch.

for AC60E: (See page for AC60F: (See page  ) )

for AC60F: (See page Result )

Result

Result

Proceed to

OK

A

NG (for AC60E)

B

NG (for AC60F)

C

B

REPLACE PARK/NEUTRAL POSITION SWITCH

C

REPLACE PARK/NEUTRAL POSITION SWITCH

A

24.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH))

(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the P1 park/neutral position switch connector.

(c) Disconnect the E13 ECM connector.

(d) Remove the ST relay (starter relay assembly) from the engine room relay block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C27-10 (STAR) - P1-4 (B)

Always

Below 1 Ω

C27-10 (STAR) or P1-4 (B) - Body ground

Always

10 kΩ or higher

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

ACC Monitor Malfunction (B2274)
DESCRIPTION This DTC is stored when a malfunction in the ACC output circuit is detected. The ACC output circuit is the circuit that goes from the ACC output terminal of the certification ECU (sma ...

Power Source Mode does not Change to ON (IG and ACC)
DESCRIPTION If any of the following operations are performed, the certification ECU (smart key ECU assembly) receives a signal, and changes the power source mode. With the electrical key tr ...

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