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
- 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, Gasoline Model) 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, Gasoline Model)
after confirming that the communication systems are functioning
properly.
Click here 
- If the smart key system (for Start Function, Gasoline Model) has been
disabled, 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 Registration.
Click here
- After completing repairs, confirm that the problem does not recur.
- After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."
HINT:
- If the engine switch is changed 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.
PROCEDURE |
1. | CHECK ENGINE CRANKING OPERATION |
(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.
(b) Move the shift lever to P. (c)
Check that the key indicator display is displayed on the
multi-information display in the combination meter assembly, and then
press the engine switch and check that the engine cranks.
|
Result | Proceed to | |
Engine cranks and initial combustion occurs |
A | | Engine cranks but initial combustion does not occur |
B | | Engine does not crank |
C |
| A |
 | GO TO OTHER PROBLEM (Immobiliser System does not Operate Properly) |
| B |
| GO TO SFI SYSTEM |
|
C |
 | |
| 2. |
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 OTHER PROBLEM (Power Source Mode does not Change to ON (IG and ACC)) |
| C |
| GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (ACC)) |
| D |
| GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG)) |
|
A | |
| |
| 3. |
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. 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 Techstream display changes correctly in response to the brake pedal operation.
| NG |
| GO TO STEP 12 |
|
OK | |
| |
| 4. |
READ VALUE USING TECHSTREAM (NEUTRAL SW/ CLUTCH SW, SHIFT POSITION P OR N) |
(a) Enter the following menus: Body Electrical / Power Source Control or Starting Control / Data List.
(b) Read the Data List according to the display on the Techstream. 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 in any position other than P or N
ON: Shift lever in P or N |
- Use this item to determine if the park/neutral position switch assembly is malfunctioning.
- When the engine cannot be started due to a park/neutral position 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 not in 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 Techstream display changes correctly in response to the shift lever operation.
| NG |
| GO TO STEP 14 |
|
OK | |
| |
| 5. |
READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL) |
(a) Enter the following menus: Body Electrical / Power Source Control / Data List.
(b) Read the Data List according to the display on the Techstream. 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 indicator display 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 16 |
|
OK | |
| |
| 6. |
READ VALUE USING TECHSTREAM (STARTER REQUEST SIGNAL) |
(a) Get into the vehicle while carrying an electrical key transmitter sub-assembly.
(b) Move the shift lever to P. (c) Enter the following menus: Body Electrical / Starting Control / Data List.
(d)
According to the display on the Techstream, read the Data List while
pressing the engine switch with the brake pedal depressed. 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 Techstream display changes.
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
OK | |
| |
(a) Inspect the ST relay.
Click here
| NG |
| REPLACE ST RELAY |
|
OK | |
| |
| 8. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY) |
| (a) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 2 - Body ground |
Engine
switch pressed and held with brake pedal depressed (starter on) →
Approximately 1 second after engine switch released (starter off) |
6 V or higher* → 1.0 V or less |
HINT: *: While the engine is cranking, the battery voltage may drop to approximately 6 V. |
 |
|
*1 | NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY
(ST Relay Holder) | | |
| NG |
| GO TO STEP 17 |
|
OK | |
| |
| 9. |
CHECK HARNESS AND CONNECTOR (ST RELAY - BATTERY AND GROUND) |
| (a) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 1 - Body ground |
Always | Below 1 Ω | |
|
|
|
*1 | NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY
(ST Relay Holder) | | |
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
No.1 engine room relay block and No.1 junction block assembly ST relay terminal 5 - Body ground |
Always | 11 to 14 V |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 10. |
CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - ST RELAY) |
(a) Disconnect the C58 starter assembly connector. (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 3 - C58-1 |
Always | Below 1 Ω | |
No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 3 or C58-1 - Other terminals and body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 11. |
CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - BATTERY) |
(a) Disconnect the C70 starter assembly connector. (b) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
C70-1 - Body ground | Always |
11 to 14 V |
| OK |
| REPLACE STARTER ASSEMBLY |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 12. |
INSPECT STOP LIGHT SWITCH ASSEMBLY | (a) Inspect the stop light switch assembly.
Click here
| NG |
| REPLACE STOP LIGHT SWITCH ASSEMBLY |
|
OK | |
| |
| 13. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY) |
(a) Disconnect the A33 stop light switch assembly connector. (b) Disconnect the K10 certification ECU (smart key ECU assembly) connector.
(c) Disconnect the A18 ECM connector. (d) Disconnect the A28 skid control ECU (brake actuator assembly) connector.
(e) Disconnect the G21 shift lock control unit assembly connector. (f) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
K10-25 (STP1) - A33-3 (L) |
Always | Below 1 Ω | |
K10-25 (STP1) or A33-3 (L) - Other terminals and body ground |
Always | 10 kΩ or higher |
| OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 14. |
INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY |
(a) Remove the park/neutral position switch assembly. Click here
(b) Inspect the park/neutral position switch assembly.
Click here
| NG |
| REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY |
|
OK | |
| |
| 15. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) |
(a) Disconnect the A10 certification ECU (smart key ECU assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A10-9 (STAR) - C53-4 (B) |
Always | Below 1 Ω | |
A10-9 (STAR) or C53-4 (B) - Other terminals and body ground |
Always | 10 kΩ or higher |
| OK |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 16. |
CHECK STEERING LOCK FUNCTION | (a) Check that the steering unlocks when the engine switch is turned on (ACC).
OK: The steering unlocks.
| OK | |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
| GO TO OTHER PROBLEM (Unable to Unlock Steering Wheel (Engine cannot Start)) |
| 17. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| (a) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
A10-9 (STAR) - Body ground |
Engine
switch pressed and held with brake pedal depressed (starter on) →
Approximately 1 second after engine switch released (starter off) |
6 V or higher* → 1.0 V or less |
HINT: *: While the engine is cranking, the battery voltage may drop to approximately 6 V. |
 |
|
*a | Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) | | |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
OK | |
| |
| 18. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) |
(a) Disconnect the A10 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the C53 park/neutral position switch assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A10-9 (STAR) - C53-4 (B) |
Always | Below 1 Ω | |
A10-9 (STAR) or C53-4 (B) - Other terminals and body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 19. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Install the ST relay to the No. 1 engine room relay block and No. 1 junction block assembly.
| (b) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
A10-20 (STA) - Body ground |
Engine
switch pressed and held with brake pedal depressed (starter on) →
Approximately 1 second after engine switch released (starter off) |
6 V or higher* → 1.0 V or less |
HINT: *: While the engine is cranking, the battery voltage may drop to approximately 6 V. |
 |
|
*a | Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) | | |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
OK | |
| |
| 20. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY) |
(a) Disconnect the A10 certification ECU (smart key ECU assembly) connector.
| (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A10-20 (STA) - No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 2 |
Always | Below 1 Ω | |
A10-20
(STA) or No. 1 engine room relay block and No. 1 junction block
assembly ST relay terminal 2 - Other terminals and body ground |
Always | 10 kΩ or higher | |
|
|
|
*1 | NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY
(ST Relay Holder) | | |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 21. |
CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST RELAY) |
| (a) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
C53-9 (L) - No. 1 engine room relay block and No. 1 junction block assembly ST relay terminal 2 |
Always | Below 1 Ω | |
C53-9
(L) or No. 1 engine room relay block and No. 1 junction block assembly
ST relay terminal 2 - Other terminals and body ground |
Always | 10 kΩ or higher | |
|
|
|
*1 | NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY
(ST Relay Holder) | | |
| OK |
| GO TO SFI SYSTEM |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR | | 
