4F-29 Electronic Stability Program:
DTC C1027: ESP® OFF Switch Circuit Failure
S5JB0E4604030
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
3 Check sensor calibration
1) Calibrate steering angle sensor referring to “Sensor
Calibration: ”.
2) Clear all DTC(s) and check DTC for ESP®.
Is DTC C1024 still detected?
Go to Step 4. Steering angle sensor
calibration was
incompleted.
4 Check steering angle sensor
1) Check steering angle sensor referring to “Steering Angle
Sensor On-Vehicle Inspection: ”.
Is it good condition?
Substitute a known-
good ESP® hydraulic
unit / control module
assembly and recheck.
Replace steering angle
sensor.
Step Action Yes No
[A]
E53
16
1
15
2
3
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BLU/WHT
BLK
12V
E53-7
1
2
I6JB01460018-01
[A]: ESP® control module connector (viewed from terminal side) 1. ESP® OFF Switch 2. ESP® hydraulic unit control module assembly
DTC Detecting Condition Trouble Area
Mechanical switch failure, failure in switch wiring is
shorted to ground.
• ESP® OFF switch
• ESP® OFF switch circuit
• ESP® control module
Step Action Yes No
1 Was “Electronic Stability Program Check” performed? Go to Step 2. Go to “Electronic
Stability Program
Check: ”.
2 Check ESP® OFF switch condition
Is ESP
®
OFF switch is OFF condition?
Go to Step 3. ESP® OFF switch
turned OFF condition
and recheck.
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