4.
Monitor the "ESP OFF SWITCH" parameter on the scantool.
The ESP switch is used to temporarily deactivate ESP control.
Trouble code is set when the condition that the level of ESP switch is high is continued for 60sec. When the ESP switch failure is set, Warning lamps won't illuminate and HECU allow the ABS/EBD/ESP control.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Short circuit monitoring | ● Open or short ESP switch ● Faulty ESP switch |
Monitoring Period | ● Continuous | |
Enable Conditions | ● When the ESP switch is ON for 60 sec. | |
Fail Safe | ● Allow the ABS/EBD/ESP control. ● The ESP warning lamp is not activated. |
ESP switch "ON" | Voltage Range of "High" |
Above 60% of the battery voltage |
Connect scantool to Data Link Connector(DLC).
Ignition "ON" ＆ Engine "OFF".
Press the ESP SWITCH.
Monitor the "ESP OFF SWITCH" parameter on the scantool.
Whenever the switch is pushed up/down, is the ESP off switch's scantool data changed ON/OFF?
▶ Fault is intermittent caused by poor connection in ESP switch line 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.
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.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damageage.
Has a problem been found?
▶ Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
▶ Go to "Signal Circuit Inspection" procedure.
Ignition "ON" ＆ Engine "OFF" ＆ ESP Switch"ON".
Measure voltage between terminal "31" of the HECU harness connector and chassis ground.
Specification : Approx B+
Is the measured voltage within specifications?
▶ Go to "Component Inspection" Procedure.
▶ Check for damaged harness and poor connection in the power harness between the battery terminal(+) and the terminal "31" of the HECU harness connector . Check for open or blown 10 A fuse referring to "Circuit Diagram" . Repair as necessary and then go to "Verification Of vehicle Repair" procedure.
▶ If OK, Go to "Component Inspection" Procedure.
Ignition "OFF".
Disconnect ESP switch connector.
Press the ESP switch.
Measure resistance between terminal "4, 5" of the ESP switch component connector.
Specification :
Approx. below 1 Ω - ESP switch is depressed.
Approx. ∞ Ω - ESP switch is not depressed.
Is the measured resistance within specifications?
▶ Fault is intermittent caused by poor connection in ESP switch line. Go to "Verification Of Vehicle Repair" procedure.
▶ Substitute with a known-good ESP switch and check for proper operation. If problem is corrected, replace ESP switch and then go to "Verification Of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode
Using a scantool, Clear DTC.
Operate the vehicle within DTC Detecting Condition in General Information
Are any DTCs present?
▶ Go to the applicable troubleshooting procedure.
▶ System performing to specification at this time.
