Dtc C1028: Master Cylinder Pressure Sensor Circuit Failure - Suzuki Swift Sport 2004 Service & Repair Manual

DTC Detecting Condition and Trouble Area
DTC Detecting Condition
Mechanical switch failure, failure in switch wiring is
shorted to ground.
DTC Troubleshooting
Step
1 Was "Electronic Stability Program Check" performed?
2 Check ESP® OFF switch condition
®
Is ESP OFF switch is OFF condition?
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?
4 Check ESP® OFF switch circuit
1) Disconnect ESP® control module connector.
2) Check for proper connection to ESP® control module
connector at "E85-7" terminal.
3) If OK, then check resistance between "E85-7" terminal
and vehicle body ground.
Is resistance infinity?

DTC C1028: Master Cylinder Pressure Sensor Circuit Failure

DTC Detecting Condition and Trouble Area
DTC Detecting Condition
Input signal voltage from master cylinder pressure sensor
in ESP® control module is too high or low.
DTC Troubleshooting
Step
1 Was "Electronic Stability Program Check" performed?
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?
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?
Action
Action
Electronic Stability Program:
Trouble Area
• ESP® OFF switch
• ESP® OFF switch circuit
• ESP® control module
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Substitute a known-
good ESP® hydraulic
unit / control module
assembly and recheck.
Trouble Area
• Leakage or air in the hydraulic brake system
• Clearance between brake pad and disc too high
Yes
Go to Step 2.
Go to Step 3.
Substitute a known-
good ESP® hydraulic
unit / control module
assembly recheck.
4F-35
No
Go to "Electronic
Stability Program
System Check".
ESP® OFF switch
turned OFF condition
and recheck.
Replace ESP® OFF
switch.
"LT GRN/RED" wire
circuit is shorted to
ground.
S7RS0B4604031
No
Go to "Electronic
Stability Program
System Check".
Repair, replace or
adjust.
Master cylinder
pressure sensor
calibration was
incompleted.