Driver can inhibit the
ESC control by ESC switch.
When switch signal send
into HECU, ESC warning lamp go ON and ESC control is stopped and if next
switch signal is inputted again, ESC control is ready. This function is
used for sporty driving or vehicle inspection.
Trouble code is set when
the condition that the level of ESC switch is high is continued for
60sec.
When the ESC switch
failure is set, Warning lamps won't illuminate and HECU allow the
ABS/EBD/ESC control.
Item
|
Detecting
Condition
|
Possible cause
|
DTC
Strategy
|
|
| •
|
Open or short ESC switch
circuit |
|
Enable
Conditions
|
| •
|
When the ESC switch is ON for 1
minute. | |
Fail
Safe
|
| •
|
Inhibit the ESC control and allow the
ABS/EBD control. |
| •
|
The ESC warning lamp is
activated. | |
Engine ON
|
ESP switch
HIGH
|
ESP switch
LOW
|
7.0V ~
16.0V
|
0V ~
3.0V
|
| 1. |
Connect scantool to Data Link
Connector(DLC). |
| 2. |
Ignition "ON" & Engine
"OFF". |
| 4. |
Monitor the "ESC SWITCH" parameter on the
scantool.
Specification
: It is changed to
ON/OFF.
|
|
| 5. |
Whenever the switch is pushed up/down, is the
ESC off switch's scantool data changed ON/OFF?
|
|
▶ Fault is
intermittent caused by poor connection in ESC switch harness
and/or HECU's connector or was repaired and HECU memory was
not cleared.
Thoroughly check
connectors for looseness, poor connection, bending, corrosion,
contamination, deterioration, or damage.
Repair or replace as necessary and then go to
"Verification Of Vehicle Repair" procedure.
|
|
|
▶ Go to
"Terminal and Connector Inspection"
procedure.
|
|
| Terminal and Connector
Inspection |
| 1. |
Many malfunctions in the electrical system are
caused by poor harness(es) and terminal condition. Faults can also
be caused by interference from other electrical systems, and
mechanical or chemical damage. |
| 2. |
Thoroughly check connectors for looseness,
poor connection, bending, corrosion, contamination, deterioration,
or damage. |
| 3. |
Has a problem been found?
|
|
▶ Repair as
necessary and then go to "Verification Of Vehicle Repair"
procedure.
|
|
|
▶ Go to
"Signal Circuit Inspection"
procedure.
|
|
| Signal Circuit
Inspection |
Open or Short Check
| 1. |
Ignition "ON" & Engine
"OFF". |
| 3. |
Measure voltage between ESC switch signal
terminal of the HECU harness connector and chassis
ground.
Specification
: Approx B+
| |
| 4. |
Is the measured value within
specifications?
|
|
▶ Go to
"Component Inspection" Procedure.
|
|
|
▶ Check for
open or blown 10A fuse referring to "Circuit
Diagram".
▶ Repair open or short in
power circuit between battery and HECU harness connector and
then, go to "Verification Of Vehicle Repair"
procedure.
▶ If there is no problem
in circuit, Go to "Component Inspection"
procedure.
|
|
ESC Switch Check
| 1. |
Ignition "ON" & Engine
"OFF". |
| 2. |
Disconnect the ESC switch
connector. |
| 3. |
Measure resistance between power terminal and
siganl terminal of the ESC switch connector.
Specification
: Approx. below 1Ω (In case of
pressing the ESC switch)
Approx. ∞ Ω (In case of not pressing the
ESC switch)
| |
| 4. |
Is the measured value within
specifications?
|
|
▶ Fault is
intermittent caused by poor connection in ESC switch harness
and/or HECU's connector.
Go to
"Verification Of Vehicle Repair" procedure.
|
|
|
▶
Substitute with a known-good ESC switch and check for proper
operation
If problem is corrected,
replace ESC switch and then go to "Verification Of Vehicle
Repair"
procedure.
|
|
| Verification of Vehicle
Repair |
After a repair, it is
essential to verify that the fault has been corrected.
| 1. |
Connect scantool and select "Diagnostic
Trouble Codes(DTCs)" mode. |
| 2. |
Using a scantool, Clear
DTC. |
| 3. |
Operate the vehicle within DTC Detecting
Condition in General Information. |
| 4. |
Using a scantool, Check DTC
present. |
| 5. |
Are any DTCs present ?
|
|
▶ Go to the
applicable troubleshooting procedure.
|
|
|
▶ System
performing to specification at this
time.
|
|
