Engine Does Not Start

2AR-FE STARTING: SMART KEY SYSTEM: Engine does not Start
- Engine does not Start

DESCRIPTION

1. ENGINE START SYSTEM OPERATION

(a) When the engine switch is pressed with the brake pedal depressed and the shift lever in P or N , the main body ECU determines that it is an engine start request.

(b) The certification ECU and other ECUs perform key verification via the LIN communication line.

(c) The main body ECU activates the ACC relay.

(d) The main body ECU activates the IG1 and IG2 relays. The engine switch indicator light illuminates in green.

(e) The certification ECU outputs a steering unlock signal. The signal is sent to the steering lock ECU via the main body ECU.

(f) The main body ECU sends an engine start request signal to the ECM.

(g) The ECM sends an ACC cut request signal to the main body ECU.

(h) The ECM and main body ECU activate the ST cut relay.

(i) The main body ECU deactivates the ACC relay until the ECU detects an engine start.

(j) The ECU reactivates the ACC relay and turns off the engine switch indicator light.

WIRING DIAGRAM

See Cranking Holding Function Circuit Cranking Holding Function Circuit.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK ENGINE SWITCH (SWITCH CONDITION)

(a) Check the power source mode change.

(1) 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:

OK:

off -> on (ACC) -> on (IG) -> off

NG -- GO TO SMART KEY SYSTEM (POWER SOURCE MODE DOES NOT CHANGE) Power Source Mode Does Not Change
OK -- Continue to next step.

2. CHECK WHETHER DTC OUTPUT OCCURS

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check whether the trouble recurs 5 seconds after the engine switch is turned on (IG).

(c) Check whether DTCs for the main body ECU or certification ECU are output.

Result

D -- GO TO ENGINE IMMOBILISER SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Engine Immobiliser System (w/ Smart Key System)

C -- GO TO STEERING LOCK SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Steering Lock System

B -- GO TO SMART KEY SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Starting - Smart Key System
A -- Continue to next step.

3. CHECK CRANKING FUNCTION

(a) Check the engine cranking function.

(1) 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 causes the engine to crank.

OK:

Engine cranks.

NG -- READ VALUE USING TECHSTREAM (SHIFT LOCK CONTROL ECU)
OK -- Continue to next step.

4. READ VALUE USING TECHSTREAM (L CODE)

(a) Use the Data List to check if L code certification is functioning properly.

Smart Key

OK:

OK is displayed on the Techstream.

NG -- REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)
OK -- Continue to next step.

5. READ VALUE USING TECHSTREAM (ENGINE START CONDITION)

(a) Use the Data List to check if the engine start is functioning properly.

Smart Key

OK:

When the brake pedal is depressed with the key inside the vehicle, OK is displayed on the Techstream.

NG -- REPLACE ECU AGGREGATION BOX ASSEMBLY (CERTIFICATION ECU)
OK -- Continue to next step.

6. READ VALUE USING TECHSTREAM (S CODE)

(a) Use the Data List to check if S code certification is functioning properly.

Smart Key

OK:

OK is displayed on the Techstream.

NG -- REPLACE ECU AGGREGATION BOX ASSEMBLY (CERTIFICATION ECU)
OK -- Continue to next step.

7. REPLACE ID CODE BOX

(a) Replace the ID code box (immobiliser code ECU) Removal.

(b) Register the recognition code (ECU code) Engine Immobiliser System (W/ Smart Key System).

(c) Check that the engine starts.

OK:

Engine starts.

NG -- REPLACE ECM Removal

OK -- END

8. READ VALUE USING TECHSTREAM (SHIFT LOCK CONTROL ECU)

(a) Use the Data List to check if the shift position signal is functioning properly.

Main Body

OK:

ON (shift lever in P) and OFF (shift lever not in P) are displayed on the Techstream.

NG -- CHECK SHIFT LOCK CONTROL ECU
OK -- Continue to next step.

9. READ VALUE USING TECHSTREAM (PARK/NEUTRAL POSITION SWITCH)

(a) Use the Data List to check if the park/neutral position switch is functioning properly.

Main Body

OK:

ON (shift lever in P or N) and OFF (shift lever not in P or N) are displayed on the Techstream.

NG -- INSPECT STARTER RELAY (ST)
OK -- Continue to next step.

10. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(a) Use the Data List to check if the stop light switch is functioning properly.

Main Body

OK:

ON (brake pedal is depressed) and OFF (brake pedal is released) are displayed on the Techstream.

NG -- GO TO LIGHTING SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Stop Light Switch Circuit
OK -- Continue to next step.

11. CHECK STEERING LOCK

(a) 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 (HOW TO PROCEED WITH TROUBLESHOOTING) How to Proceed With Troubleshooting
OK -- Continue to next step.

12. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

(a) Disconnect the E17 main body ECU connector.

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

HINT
The voltage is generated at terminal STSW for 0.3 seconds when the engine cranks.

Standard Voltage:

NG -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

OK -- REPLACE ECM Removal

13. CHECK SHIFT LOCK CONTROL ECU

(a) Disconnect the E39 shift lock control ECU connector.

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

Standard Resistance:

NG -- REPLACE SHIFT LOCK CONTROL ECU SUB-ASSEMBLY Removal and Replacement
OK -- Continue to next step.

14. CHECK HARNESS AND CONNECTOR (SHIFT LOCK CONTROL ECU - MAIN BODY ECU AND BODY GROUND)

(a) Disconnect the E15 main body ECU connector.

(b) Disconnect the E39 shift lock control ECU connector.

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

15. INSPECT STARTER RELAY (ST)

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

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

Standard Resistance:

NG -- REPLACE STARTER RELAY
OK -- Continue to next step.

16. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

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

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

Standard Resistance:

NG -- REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Service and Repair
OK -- Continue to next step.

17. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - PARK/NEUTRAL POSITION SWITCH)

(a) Disconnect the E17 ECU connector.

(b) Disconnect the B26 switch connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

18. CHECK HARNESS AND CONNECTOR (STARTER RELAY - PARK/NEUTRAL POSITION SWITCH AND BODY GROUND)

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

19. REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

(a) Replace the steering lock actuator assembly (steering lock ECU) Removal.

(b) Register the recognition code (ECU code) Engine Immobiliser System (W/ Smart Key System).

(c) Check that the engine starts.

OK:

Engine starts.

NG -- REPLACE ID CODE BOX Removal

OK -- END

20. REPLACE ECU AGGREGATION BOX ASSEMBLY (CERTIFICATION ECU)

(a) Replace the certification ECU Removal.

(b) Register the recognition code (ECU code) Engine Immobiliser System (W/ Smart Key System).

(c) Check that the engine starts.

OK:

Engine starts.

NG -- REPLACE ID CODE BOX Removal

OK -- END