| Last Modified: 11-27-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Theft Deterrent/Keyless Entry | |
| Model Year: 2008 | Model: LX570 | Doc ID: X39400000IL012J |
| Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): DESCRIPTION (2008 LX570) | ||
|
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, the main body ECU determines that it is an engine start request.
(b) The certification ECU (smart key ECU assembly) and other ECUs perform key verification via the LIN communication line. The engine switch indicator light illuminates in green.
(c) The main body ECU activates the IG1 No. 3 relay, ACC relay and integration relay (IG2 relay).
(d) The certification ECU (smart key ECU assembly) outputs a steering unlock signal. The signal is sent to the steering lock ECU via the LIN communication line.
(e) The main body ECU sends an engine start request signal to the ECM.
(f) The main body ECU deactivates the ACC relay until the ECU detects an engine start.
(g) The ECU reactivates the ACC relay and turns off the engine switch indicator light.
|
Symbols of Main Body ECU |
Signals |
|---|---|
|
SSW1/SSW2 |
Engine switch on (ACC), on (IG) signal |
|
IG1D |
IG1 No. 3 relay operation signal |
|
ACCD |
ACC relay operation signal |
|
IG2D |
Integration relay (IG2 relay) operation signal |
|
STP |
Stop light switch signal |
|
P |
Shift lock signal |
|
TACH |
Engine start detection signal |
|
STSW |
Starter activation request signal |
|
ACCR |
ACC cut request signal |
WIRING DIAGRAM
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
|
|
2. |
CHECK WHETHER DTC OUTPUT RECURS |
(a) Clear the DTCs
.
(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 (smart key ECU assembly) are output.
Result
|
Result |
Proceed to |
|---|---|
|
No DTC output |
A |
|
DTC for main body ECU output Smart access system with push-button start (for start function) |
B |
|
DTC for certification ECU (Smart key ECU assembly) output Steering lock system |
C |
|
DTC for certification ECU (Smart key ECU assembly) output Engine immobiliser system |
D |
|
|
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 cranks the engine.
OK:
Engine cranks.
|
|
4. |
READ VALUE USING TECHSTREAM (L CODE) |
(a) Use the Data List to check if L code certification is functioning properly.
Smart Access
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
L Code Check |
L code certification result/NG or OK |
OK: L code certification result normal NG: L code certification result abnormal |
- |
OK:
OK is displayed on the Techstream.
|
|
5. |
READ VALUE USING TECHSTREAM (ENGINE START CONDITION) |
(a) Use the Data List to check if the engine start is functioning properly.
Smart Access
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Engine Start Condition |
Engine start condition by certification ECU (smart key ECU assembly)/OK or NG |
OK: Engine start permitted NG: Engine start prohibited |
- |
OK:
OK is displayed on the Techstream.
|
|
6. |
READ VALUE USING TECHSTREAM (S CODE) |
(a) Use the Data List to check if S code certification is functioning properly.
Smart Access
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
S Code Check |
S code certification result/NG or OK |
OK: S code certification result normal NG: S code certification result abnormal |
- |
OK:
OK is displayed on the Techstream.
|
|
7. |
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
(a) Replace the ID code box (immobiliser code ECU)
.
(b) Register the recognition code (ECU code)
.
(c) Check that the engine starts.
OK:
Engine starts.
|
|
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
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Shift P Signal |
Shift P position signal/ON or OFF |
ON: Shift lever in P OFF: Shift lever not in P |
- |
OK:
ON (shift lever in P) and OFF (shift lever not in P) are displayed on the Techstream.
|
|
9. |
READ VALUE USING TECHSTREAM (PARK/NEUTRAL POSITION SWITCH) |
(a) Use the Data List to check if the park/neutral switch is functioning properly.
Main Body
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Neutral SW/ Clutch SW |
Park/neutral position switch/ON or OFF |
ON: Shift lever in P or N OFF: Shift lever not in P or N |
- |
OK:
ON (shift lever in P or N) and OFF (shift lever not in P or N) are displayed on the Techstream.
|
|
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
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Stop Light SW |
Stop light switch/ON or OFF |
ON: Brake pedal depressed OFF: Brake pedal released |
- |
OK:
ON (brake pedal is depressed) and OFF (brake pedal is released) are displayed on the Techstream.
|
|
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.
|
|
12. |
CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) |
(a) 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E4-4 (STSW) - Body ground |
Brake pedal depressed with shift lever in P, engine switch pushed once |
11 to 14 V |
|
|
13. |
CHECK SHIFT LOCK CONTROL ECU SUB-ASSEMBLY |
(a) Disconnect the E51 shift lock control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
11 (P2) - 3 (E) |
Shift lever not in P |
Below 1 Ω |
|
11 (P2) - 3 (E) |
Shift lever in P |
10 kΩ or higher |
|
|
14. |
CHECK HARNESS AND CONNECTOR (SHIFT LOCK CONTROL ECU - MAIN BODY ECU AND BODY GROUND) |
(a) Disconnect the E4 main body ECU connector.
(b) Disconnect the E51 shift lock control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E4-2 (P) - E51-11 (P2) |
Always |
Below 1 Ω |
|
E51-3 (E) - Body ground |
Always |
Below 1 Ω |
|
E4-2 (P) or E51-11 (P2) - Body ground |
Always |
10 kΩ or higher |
|
|
15. |
INSPECT STARTER RELAY (ST) |
|
(a) Remove the starter relay from the engine room relay block. |
(b) Measure the resistance according value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 - 5 |
Battery voltage not applied to terminals 1 and 2 |
10 kΩ or higher |
|
3 - 5 |
Battery voltage applied to terminals 1 and 2 |
Below 1 Ω |
|
|
16. |
INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY |
|
(a) Disconnect the C19 park/neutral position switch connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
4 (B) - 5 (L) |
P |
Below 1 Ω |
|
4 (B) - 5 (L) |
N |
Below 1 Ω |
|
4 (B) - 5 (L) |
Not in P or N |
10 kΩ or higher |
|
|
17. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - PARK/NEUTRAL POSITION SWITCH) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E1-8 (STR) - C19-4 (B) |
Always |
Below 1 Ω |
|
E1-8 (STR) or C19-4 (B) - Body ground |
Always |
10 kΩ or higher |
|
|
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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C19-5 (L) - Relay block ST relay terminal 1 |
Always |
Below 1 Ω |
|
C19-5 (L) or Relay block ST relay terminal 1 - Body ground |
Always |
10 kΩ or higher |
|
Relay block ST relay terminal 2 - Body ground |
Always |
Below 1 Ω |
|
|
19. |
INSPECT FUSE (STOP) |
(a) Remove the STOP fuse from the engine room relay block.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
STOP fuse |
Always |
Below 1 Ω |
|
|
20. |
INSPECT STOP LIGHT SWITCH ASSEMBLY |
(a) Disconnect the A30 stop light switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
1 - 2 |
Stop light switch pin not pushed |
Below 1 Ω |
|
3 - 4 |
Stop light switch pin pushed |
Below 1 Ω |
|
1 - 2 |
Stop light switch pin pushed |
10 kΩ or higher |
|
3 - 4 |
Stop light switch pin not pushed |
10 kΩ or higher |
|
|
21. |
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - MAIN BODY ECU AND BATTERY) |
(a) Disconnect the 2B main body ECU connector.
(b) Disconnect the A30 stop light switch connector.
(c) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A30-2 - Body ground |
Always |
11 to 14 V |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2B-22 (STP) - A30-1 |
Always |
Below 1 Ω |
|
2B-22 (STP) or A30-1 - Body ground |
Always |
10 kΩ or higher |
|
|
22. |
REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) |
(a) Replace the steering lock actuator assembly (steering lock ECU)
.
(b) Register the recognition code (ECU code)
.
(c) Check that the engine starts.
OK:
Engine starts.
|
|
23. |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Replace the certification ECU (smart key ECU assembly)
.
(b) Register the recognition code (ECU code)
.
(c) Check that the engine starts.
OK:
Engine starts.
|
|
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