Toyota CH-R Service Manual: Engine does not Start

Toyota CH-R Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / Engine does not Start

DESCRIPTION

When the electrical key transmitter sub-assembly is in the cabin and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Additionally, when the shift lever is in P and the brake pedal is depressed, the engine can be started by pressing the engine switch. If the steering is unlocked, the engine can also be started by pressing the engine switch with the shift lever in N and the brake pedal depressed.

Related Data List and Active Test Items

Problem Symptom

Data List and Active Test

Engine does not start
Power Source Control
  • Stop Light Switch1
  • Steering Unlock Switch
  • Shift P Signal
  • Neutral SW/ Clutch SW
  • IG Relay Monitor (Inside)
  • IG Relay Monitor (Outside)
  • Latch Circuit
  • Starter Request Signal
  • Power Supply Condition
Smart Key
  • Immobiliser
  • Engine Start Request
  • S Code Check
  • L Code Check
Starting Control
  • Starter SW
  • Shift Position P or N
  • Ignition

WIRING DIAGRAM

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 at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

  • If the smart key system (for Start Function) has been canceled, enable the system before performing troubleshooting.

    Click here

  • Inspect the fuses of circuits related to this system before performing the following procedure.
  • Before replacing the certification ECU (smart key ECU assembly) or an electrical key transmitter sub-assembly, refer to smart key system (for Start Function) Precaution.

    Click here

  • After completing repairs, confirm that the problem does not recur.

HINT:

  • When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.
  • If the engine switch is turned from on (IG) to on (ACC) with the shift lever in any position other than P, and then the shift lever is moved to P and the engine switch is pressed with the brake pedal depressed, the engine switch will turn off.
  • If the brake pedal is repeatedly depressed while the engine is stopped, the brake booster pressure will be released and the force required to depress the brake pedal to illuminate the stop lights will increase.
  • The certification ECU (smart key ECU assembly) stores the operation history of smart key system and it can be read using the Techstream.
Body Electrical > Smart Key > Utility

Tester Display

Operation History
Radio Wave Interference (RF Signal Received)

Parameter Name

Content

Operating Engine Switch / Key RF Signal Interference

When the engine switch was operated, the electrical key transmitter sub-assembly could not be confirmed due to wave interference.

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 14

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.

Body Electrical > Smart Key > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Key Low Battery

Transmitter battery depleted

No or Yes

No: Transmitter battery not depleted

Yes: Transmitter battery depleted

The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. "Yes" is displayed for the Data List item "Key Low Battery" 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).
Body Electrical > Smart Key > Data List

Tester Display

Key Low Battery

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 ENGINE CRANK

(a) Get into the vehicle while carrying the electrical key transmitter.

(b) Move the shift lever to P.

(c) Depress the brake pedal.

(d) Press the engine switch and check that the engine cranks.

Result

Proceed to

Engine cranks, but there is no initial combustion or engine is difficult to start

A

Engine does not cranks

B
B

GO TO STEP 6

A

4.

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

(a) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A38 ECM connector.

(c) Disconnect the C36 park/neutral position switch connector.

(d) Remove the ST relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M66-20 (STA) - A38-29 (STA)

Always

Below 1 Ω

M66-20 (STA) or A38-29 (STA) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK CONNECTOR CONNECTION CONDITION

(a) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(b) Connect the M66 certification ECU (smart key ECU assembly) connector.

(c) Press the engine switch and check that the engine starts.

OK:

Engine starts.

OK

CONNECT SECURELY
NG

GO TO IMMOBILISER SYSTEM

6.

CHECK FOR DTC

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

Body Electrical > Smart Key > Trouble Codes Body Electrical > Starting Control > Trouble Codes Body Electrical > Power Source Control > Trouble Codes

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.

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

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

8.

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) According to the display on the Techstream, read the Data List.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Stop Light Switch1

State of brake pedal

OFF or ON

OFF: Brake pedal released

ON: Brake pedal depressed
  • Use this item to determine if the stop light switch assembly is malfunctioning.
  • The engine cannot be started when this item is OFF.
  • If the stop light switch assembly is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.
Body Electrical > Power Source Control > Data List

Tester Display

Stop Light Switch1

OK:

The item in the Data List changes when the brake pedal is depressed and released.

NG

GO TO STEP 28

OK

9.

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) According to the display on the Techstream, read the Data List.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Neutral SW/ Clutch SW

Shift position (P and N)

OFF or ON

OFF: Shift lever not in P or N

ON: Shift lever in P or N
  • Use this item to determine whether the park/neutral start switch assembly is malfunctioning.
  • When the engine cannot be started due to a park/neutral start switch assembly malfunction, "OFF" is displayed.
Body Electrical > Power Source Control > Data List

Tester Display

Neutral SW/ Clutch SW
Body Electrical > Starting Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Shift Position P or N

Park/neutral position switch status

OFF or ON

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

ON: Shift lever in P or N

When OFF is displayed, the engine will not crank.
Body Electrical > Starting Control > Data List

Tester Display

Shift Position P or N

OK:

The item in the Data List changes according to the shift position.

NG

GO TO STEP 26

OK

10.

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) According to the display on the Techstream, read the Data List.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Starter Request Signal

Engine start request signal status

OFF or ON

OFF: The engine switch is not pressed

ON: With the shift lever in P and the brake pedal depressed, the engine switch is pressed and held
  • 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.
Body Electrical > Power Source Control > Data List

Tester Display

Starter Request Signal

NOTICE:

Check that the key warning light is illuminated in green on the combination meter assembly, and then press the engine switch.

OK:

The display changes in response to the operation of the engine switch.

NG

GO TO STEP 24

OK

11.

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) 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 Data List item changes.

Body Electrical > Starting Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Starter SW

Starter operation request

OFF or ON

OFF: Starter operation not requested

ON: Starter operation requested

When OFF is displayed, the engine will not crank.
Body Electrical > Starting Control > Data List

Tester Display

Starter SW

OK:

The Data List item changes.

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

12.

READ VALUE USING TECHSTREAM (STARTER RELAY)

(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) According to the display on the Techstream, read the Data List.

Body Electrical > Starting Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Starter Relay

Starter relay voltage monitor

OFF or ON

OFF: ST relay off

ON: ST relay on

When OFF is displayed the engine cannot be cranked.
Body Electrical > Starting Control > Data List

Tester Display

Starter Relay
NG

GO TO STEP 15

OK

13.

CHECK CONNECTOR CONNECTION CONDITION

(a) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(b) Connect the M66 certification ECU (smart key ECU assembly) connector.

(c) Press the engine switch and check that the engine starts.

OK:

Engine starts.

OK

CONNECT SECURELY
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

14.

INSPECT TRANSMITTER BATTERY

(a) Inspect the transmitter battery.

Click here

NOTICE:

Do not wrap the lead wire ground 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

15.

INSPECT ST RELAY

(a) Remove the ST relay.

(b) Inspect the ST relay.

Click here

NG

REPLACE ST RELAY
OK

16.

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

(a) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

*a

Front view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))

(b) Disconnect the A38 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

M66-20 (STA) - Body ground

20°C (68°F)

101.69 to 153.84 Ω

M66-9 (STAR) - Body ground
NG

GO TO STEP 19

OK

17.

INSPECT STARTER ASSEMBLY

(a) Remove the starter assembly.

Click here

(b) Inspect the starter assembly.

Click here

NG

REPLACE STARTER ASSEMBLY

OK

18.

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

(a) Remove the starter assembly from the vehicle to perform an inspection.

Click here

(b) Remove the ST relay.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C67-1 - Body ground

Always

11 to 14 V

ST relay terminal 5 - 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

ST relay terminal 3 - C35-1

Always

Below 1 Ω

ST relay terminal 3 or C35-1 - Body ground

Always

10 kΩ or higher
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

19.

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

(a) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the C36 park/neutral position switch connector.

(c) Disconnect the A38 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M66-9 (STAR) - C36-4 (B)

Always

Below 1 Ω

M66-9 (STAR) or C36-4 (B)

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

20.

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

(a) Disconnect the C36 park/neutral position switch connector.

(b) Remove the ST relay.

(c) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(d) Disconnect the A38 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C36-9 (L) - ST relay terminal 2

Always

Below 1 Ω

C36-9 (L) or ST relay terminal 2 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

21.

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

(a) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A38 ECM connector.

(c) Disconnect the C36 park/neutral position switch connector.

(d) Remove the ST relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M66-20 (STA) - ST relay terminal 2

Always

Below 1 Ω

M66-20 (STA) or ST relay terminal 2 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

22.

CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)

(a) Remove the ST relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

ST relay terminal 1 - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

23.

CHECK CONNECTOR CONNECTION CONDITION

(a) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(b) Connect the M66 certification ECU (smart key ECU assembly) connector.

(c) Press the engine switch and check that the engine starts.

OK:

Engine starts.

OK

CONNECT SECURELY
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

24.

CHECK STEERING LOCK SYSTEM

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

OK:

The steering unlocks.

NG

GO TO STEERING LOCK SYSTEM (PROBLEM SYMPTOMS TABLE)

OK

25.

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:

It is determined that the immobiliser function is 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:

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

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

GO TO IMMOBILISER SYSTEM (PROBLEM SYMPTOMS TABLE)

26.

INSPECT PARK/NEUTRAL POSITION SWITCH

(a) Remove the park/neutral position switch.

Click here

(b) Inspect the park/neutral position switch.

Click here

NG

REPLACE PARK/NEUTRAL POSITION SWITCH

OK

27.

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

(a) Disconnect the M66 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the C36 park/neutral position switch connector.

(c) Disconnect the A38 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M66-9 (STAR) - C36-4 (B)

Always

Below 1 Ω

M66-9 (STAR) or C36-4 (B)

Always

10 kΩ or higher
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

28.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Remove the stop light switch assembly.

Click here

(b) Inspect the stop light switch assembly.

Click here

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

29.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER SUPPLY AND BODY GROUND)

(a) Disconnect the stop light switch assembly connector.

*a

Front view of wire harness connector

(to Stop Light Switch Assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A45-7 (B) - Body ground

Always

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A45-2 (GND) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

30.

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

(a) Disconnect the M67 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A38 ECM connector.

(c) Disconnect the A42 skid control computer (brake actuator assembly) connector.

(d) Disconnect the F19 shift lock control unit assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M67-25 (STP1) - A45-3 (L)

Always

Below 1 Ω

M67-25 (STP1) or A45-3 (L) - Body ground

Always

10 kΩ or higher
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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