Electronic Stability Program: 4F-30
DTC C1028: Master Cylinder Pressure Sensor Circuit Failure
S5JB0E4604031
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
3 Check ESP® OFF switch
1) Turn ignition switch to OFF position.
2) Remove ESP® OFF switch referring to “ESP® OFF
Switch Removal and Installation: ”.
3) Check for proper connection at each terminal of ESP®
OFF switch.
4) If OK, then check ESP® OFF switch referring to “ESP®
OFF Switch Inspection: ”.
Is it good condition?
Go to Step 4. Replace ESP® OFF
switch.
4 Check ESP® OFF switch circuit
1) Disconnect ESP® control module connector.
2) Check for proper connection to ESP® control module
connector at “E53-7” terminal.
3) If OK, then check resistance between “E53-7” terminal
and vehicle body ground.
Is resistance infinity?
Substitute a known-
good ESP® hydraulic
unit / control module
assembly and recheck.
“BLU/WHT” wire circuit
is shorted to ground.
Step Action Yes No
DTC Detecting Condition Trouble Area
Input signal voltage from master cylinder pressure sensor
in ESP® control module is too high or low.
• Leakage or air in the hydraulic brake system
• Clearance between brake pad and disc too high
Step Action Yes No
1 Was “Electronic Stability Program Check” performed? Go to Step 2. Go to “Electronic
Stability Program
Check: ”.
2 Check brake system
1) Check brake system as follows.
• Leakage or air in the hydraulic brake system
• Clearance between brake pad and disc too high
Are they in good condition?
Go to Step 3. Repair, replace or
adjust.
3 Check sensor calibration
1) Calibrate master cylinder pressure sensor referring to
“Sensor Calibration: ”.
2) Clear all DTC(s) and recheck DTC.
Is DTC C1028 still detected?
Substitute a known-
good ESP® hydraulic
unit / control module
assembly and recheck.
Master cylinder
pressure sensor
calibration was
incompleted.
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