Engine does not Start [11/2023 - ]: Procedure
- CHECK WHETHER ENGINE STARTS
- Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the ignition switch to ON.
- Check that the engine can be started 5 seconds after the ignition switch turned to ON.
OK
Engine starts normally.
Result
Proceed to OK NG
Result:
OK
CHECK VEHICLE CONTROL HISTORY (ROB). Refer to CHECK FOR INTERMITTENT PROBLEMS [11/2023 - ]
Result:
NG
See step 2
- CHECK SECURITY INDICATOR LIGHT (IMMOBILIZER FUNCTION UNSET)
- Get into the vehicle while carrying an electrical key transmitter sub-assembly.
- Move the shift position to P.
- 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 ACC.
OK
The security indicator light changes from blinking to off at the same time that the power source mode changes to ACC.
HINT:
The immobilizer 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 ACC.
Result
Proceed to OK NG
Result:
NG
GO TO OTHER PROBLEM (Immobilizer System does not Operate Properly). Refer to Immobilizer System does not Operate Properly [11/2023 - ]
Result:
OK
See step 3
- CHECK FOR DTC
- Using the GTS, check if LIN communication DTC B2785-88 and B2789-87 are output.
Body Electrical > Smart Access > Trouble Codes
OK
DTC B2785-88 and B2789-87 are not output.
Result
Proceed to OK NG
Result:
NG
GO TO LIN COMMUNICATION SYSTEM (DTC B2785-88). Refer to DTC B2785-88: Communication between ECUs connected by LIN Bus off [11/2023 - ]
Result:
OK
See step 4
- Using the GTS, check if LIN communication DTC B2785-88 and B2789-87 are output.
- CHECK ENGINE CRANKING OPERATION
- Get into the vehicle while carrying an electrical key transmitter sub-assembly.
- Move the shift position to P.
- 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
Result Proceed to Engine cranks and initial combustion occurs A Engine cranks but initial combustion does not occur B Engine does not crank C
Result:
A
GO TO OTHER PROBLEM (Immobilizer System does not Operate Properly). Refer to Immobilizer System does not Operate Properly [11/2023 - ]
Result:
B
GO TO SFI SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]
Result:
C
See step 5
- CHECK ENGINE SWITCH CONDITION
- Get into the vehicle while carrying an electrical key transmitter sub-assembly.
- Move the shift position to P.
- 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 → ACC → ON → off A Power source mode does not change to ACC or ON B Power source mode changes to ON but not to ACC C Power source mode changes to ACC but not to ON D
Result:
B
GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG and ACC)). Refer to Power Source Mode does not Change to ON (IG and ACC) [11/2023 - ]
Result:
C
GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (ACC)). Refer to Power Source Mode does not Change to ON (ACC) [11/2023 - ]
Result:
D
GO TO OTHER PROBLEM (Power Source Mode does not Change to ON (IG)). Refer to Power Source Mode does not Change to ON (IG) [11/2023 - ]
Result:
A
See step 6
- READ VALUE USING GTS (STOP LIGHT SWITCH1)
- Read the Data List according to the display on the GTS.
Body Electrical > Power Source Control > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note Stop Light Switch 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 Switch OK
The GTS display changes correctly in response to the brake pedal operation.
Result
Proceed to OK NG
Result:
NG
See step 26
Result:
OK
See step 7
- Read the Data List according to the display on the GTS.
- READ VALUE USING GTS (SHIFT P SIGNAL)
- Read the Data List according to the display on the GTS.
Body Electrical > Power Source Control > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note Shift P Signal Shift position P OFF or ON OFF: Shift lever not in P
ON: Shift lever in P- Use this item to determine if the shift position switch is malfunctioning.
- The engine cannot be started when this item is OFF.
Body Electrical > Power Source Control > Data List
Tester Display Shift P Signal OK
The GTS display changes correctly in response to the shift lever operation.
Result
Proceed to OK NG
Result:
NG
See step 23
Result:
OK
See step 8
- Read the Data List according to the display on the GTS.
- READ VALUE USING GTS (NEUTRAL SWITCH/ CLUTCH SWITCH, SHIFT POSITION P OR N)
- Read the Data List according to the display on the GTS.
Body Electrical > Power Source Control > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note Neutral Switch / Clutch Switch 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 Switch / Clutch Switch OK
The GTS display changes correctly in response to the shift lever operation.
Result
Proceed to OK NG
Result:
NG
See step 19
Result:
OK
See step 9
- Read the Data List according to the display on the GTS.
- READ VALUE USING GTS (POWER SUPPLY CONDITION)
- Read the Data List according to the display on the GTS.
Body Electrical > Power Source Control > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note Power Supply Condition Power supply state OFF, ACC ON, IGR ON, IGP ON or Starter ON OFF: Ignition switch off
ACC ON: Ignition switch ACC
IGR ON: Ignition switch ON
IGP ON: Ignition switch ON
Starter ON: Sending engine start request signal- Body Electrical > Power Source Control > Data List
Tester Display Power Supply Condition NOTE: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 GTS display changes correctly in response to the engine switch operation.
Result
Proceed to OK NG
Result:
NG
See step 18
Result:
OK
See step 10
- Read the Data List according to the display on the GTS.
- INSPECT ST RELAY
Refer to ON-VEHICLE INSPECTION [10/2022 - ]
Result
Proceed to OK NG Result:
NG
REPLACE ST RELAY
Result:
OK
See step 11
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY)
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition 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 *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
(ST Relay Holder)HINT:
*: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.
Result
Result Proceed to OK A NG (w/ Engine Stop and Start Function) B NG (w/o Engine Stop and Start Function) C
Result:
B
See step 15
Result:
C
See step 16
Result:
A
See step 12
- Measure the voltage according to the value(s) in the table below.
- CHECK HARNESS AND CONNECTOR (ST RELAY - AUXILIARY BATTERY AND GROUND)
- 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 *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
(ST Relay Holder) - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition ST relay terminal 5 - Body ground Ignition switch off 11 to 14 V Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 13
- Measure the resistance according to the value(s) in the table below.
- CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - ST RELAY)
- Disconnect the C90*1 or C56*2 starter assembly connector.
- *1: w/ Engine Stop and Start Function
- *2: w/o Engine Stop and Start Function
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
W/ ENGINE STOP AND START FUNCTION:Tester Connection Condition Specified Condition ST relay terminal 3 - C90-2 (SL1) Always Below 1 Ω ST relay terminal 3 or C90-2 (SL1) - Other terminals and body ground Always 10 kΩ or higher W/O ENGINE STOP AND START FUNCTION:Tester Connection Condition Specified Condition ST relay terminal 3 - C56-1 (ST) Always Below 1 Ω ST relay terminal 3 or C56-1 (ST) - Other terminals and body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 14
- Disconnect the C90*1 or C56*2 starter assembly connector.
- CHECK HARNESS AND CONNECTOR (STARTER ASSEMBLY - AUXILIARY BATTERY)
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition L1-1 (B) - Body ground Ignition switch off 11 to 14 V Result
Proceed to OK NG
Result:
OK
REPLACE STARTER ASSEMBLY. Refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- Measure the voltage according to the value(s) in the table below.
- CHECK ENGINE STOP AND START ECU
- Disconnect the A34 engine stop and start ECU connector.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition 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 *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
(ST Relay Holder)HINT:
*: While the engine is cranking, the auxiliary battery voltage may drop to approximately 6 V.
Result
Proceed to OK NG
Result:
OK
REPLACE ENGINE STOP AND START ECU. Refer to REMOVAL [11/2023 - ]
Result:
NG
See step 16
- INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A88-10 (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 auxiliary battery voltage may drop to approximately 6 V.
Result
Proceed to OK NG
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
Result:
OK
See step 17
- Measure the voltage according to the value(s) in the table below.
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY)
- Disconnect the A88 certification ECU (smart key ECU assembly) connector.
- Disconnect the A83 ECM connector.
- Disconnect the C52 park/neutral position switch assembly connector.
- Disconnect the A34 engine stop and start ECU assembly connector.*
- *: w/ Engine Stop and Start Function
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A88-3 (STA) - ST relay terminal 2 Always Below 1 Ω A88-3 (STA) or ST relay terminal 2 - Other terminals and body ground Always 10 kΩ or higher A83-16 (STA) - ST relay terminal 2 Always Below 1 Ω A83-16 (STA) or ST relay terminal 2 - Other terminals and body ground Always 10 kΩ or higher C52-9 (L) - ST relay terminal 2 Always Below 1 Ω C52-9 (L) or ST relay terminal 2 - Other terminals and body ground Always 10 kΩ or higher A34-21 (STA) - ST relay terminal 2* Always Below 1 Ω A34-21 (STA) or ST relay terminal 2 - Other terminals and body ground* Always 10 kΩ or higher - *: w/ Engine Stop and Start Function
Result
Proceed to OK NG
Result:
OK
REPLACE ECM. Refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- CHECK SECURITY INDICATOR LIGHT (IMMOBILIZER FUNCTION UNSET)
- Get into the vehicle while carrying an electrical key transmitter sub-assembly.
- Move the shift position to P.
- 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 ACC.
OK
The security indicator light changes from blinking to off at the same time that the power source mode changes to ACC.
HINT:
The immobilizer 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 ACC.
Result
Proceed to OK NG
Result:
OK
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [11/2023 - ]
Result:
NG
GO TO OTHER PROBLEM (Immobilizer System does not Operate Properly). Refer to Immobilizer System does not Operate Properly [11/2023 - ]
- READ VALUE USING GTS (NEUTRAL SWITCH/ CLUTCH SWITCH)
- Disconnect the A83 ECM connector.
- Read the Data List according to the display on the GTS.
Body Electrical > Power Source Control > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note Neutral Switch / Clutch Switch 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 Switch / Clutch Switch OK
The GTS display changes correctly in response to the shift lever operation.
Result
Result Proceed to OK A NG (w/ Engine Stop and Start Function) B NG (w/o Engine Stop and Start Function) C
Result:
A
REPLACE ECM. Refer to REMOVAL [11/2023 - ]
Result:
C
See step 21
Result:
B
See step 20
- READ VALUE USING GTS (NEUTRAL SWITCH/ CLUTCH SWITCH)
- Disconnect the A34 engine stop and start ECU connector.
- Read the Data List according to the display on the GTS.
Body Electrical > Power Source Control > Data List
Tester Display Measurement Item Range Normal Condition Diagnostic Note Neutral Switch / Clutch Switch 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 Switch / Clutch Switch OK
The GTS display changes correctly in response to the shift lever operation.
Result
Proceed to OK NG
Result:
OK
REPLACE ENGINE STOP AND START ECU. Refer to REMOVAL [11/2023 - ]
Result:
NG
See step 21
- INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY
Refer to INSPECTION [10/2022 - ]
Result
Proceed to OK NG Result:
NG
REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
OK
See step 22
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY)
- Disconnect the A88 certification ECU (smart key ECU assembly) connector.
- Disconnect the A83 ECM connector.
- Disconnect the C52 park/neutral position switch assembly connector.
- Disconnect the A34 engine stop and start ECU assembly connector.*
- *: w/ Engine Stop and Start Function
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A88-10 (STAR) - C52-4 (B) Always Below 1 Ω A88-10 (STAR) or C52-4 (B) - Other terminals and body ground Always 10 kΩ or higher A83-15 (NSW) - C52-4 (B) Always Below 1 Ω A83-15 (NSW) or C52-4 (B) - Other terminals and body ground Always 10 kΩ or higher A34-17 (CLL) - C52-4 (B)* Always Below 1 Ω A34-17 (CLL) or C52-4 (B) - Other terminals and body ground* Always 10 kΩ or higher A88-3 (STA) - C52-9 (L) Always Below 1 Ω A88-3 (STA) or C52-9 (L) - Other terminals and body ground Always 10 kΩ or higher A83-16 (STA) - C52-9 (L) Always Below 1 Ω A83-16 (STA) or C52-9 (L) - Other terminals and body ground Always 10 kΩ or higher ST relay terminal 2 - C52-9 (L) Always Below 1 Ω ST relay terminal 2 or C52-9 (L) - Other terminals and body ground Always 10 kΩ or higher A34-21 (STA) - C52-9 (L)* Always Below 1 Ω A34-21 (STA) or C52-9 (L) - Other terminals and body ground* Always 10 kΩ or higher - *: w/ Engine Stop and Start Function
Result
Proceed to OK NG
Result:
OK
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- CHECK SHIFT LOCK CONTROL UNIT ASSEMBLY
- Disconnect the H138 certification ECU (smart key ECU assembly) connector.
- Measure the registance according to the value(s) in the table below.
Standard Registance
Tester Connection Condition Specified Condition H138-14 (P) - Body ground Shift lever in P → Shift lever not in P 30 kΩ or higher → Below 200 Ω Result
Proceed to OK NG
Result:
OK
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [11/2023 - ]
Result:
NG
See step 24
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SHIFT LOCK CONTROL UNIT ASSEMBLY)
- Disconnect the H28 shift lock control unit assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition H138-14 (P) - H28-3 (P2) Always Below 1 Ω H138-14 (P) or H28-3 (P2) - Other terminals and body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 25
- CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
- Connect the H138 certification ECU (smart key ECU assembly) connector.
- Connect the H28 shift lock control unit assembly connector.
- Measure the voltage according to the value(s) in the table below.
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly))Standard Voltage
Tester Connection Condition Specified Condition H138-14 (P) - Body ground Shift lever in P 9 V or higher Result
Proceed to OK NG
Result:
OK
REPLACE SHIFT LOCK CONTROL UNIT ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [11/2023 - ]
- CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER SOURCE AND BODY GROUND)
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition A42-7 (B) - Body ground Ignition switch off 11 to 14 V - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A42-2 (GND) - Body ground Always Below 1 Ω Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 27
- Measure the voltage according to the value(s) in the table below.
- INSPECT STOP LIGHT SWITCH ASSEMBLY
Refer to ON-VEHICLE INSPECTION [12/2019 - ]
Result
Proceed to OK NG Result:
NG
REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to REMOVAL [12/2019 - ]
Result:
OK
See step 28
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)
- Disconnect the A88 certification ECU (smart key ECU assembly) connector.
- Disconnect the A42 stop light switch assembly connector.
- Disconnect the A83 ECM connector.
- Disconnect the A39 skid control ECU (brake actuator assembly) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A88-21 (STP1) - A42-3 (L) Always Below 1 Ω A88-21 (STP1) or A42-3 (L) - Other terminals and body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [11/2023 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

