C1027

DTC C1027: ESP(R) OFF Switch Circuit Failure

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Troubleshooting



1.
Was "Electronic Stability Program Check" performed?
YES
Go to Step 2.
NO
Go to Electronic Stability Program Check.

2. Check ESP(R) OFF switch

Turn ignition switch to OFF position.
Remove ESP(R) OFF switch referring to ESP OFF Switch Removal and Installation ESP(R) OFF Switch Removal and Installation.
Check for proper connection at each terminal of ESP(R) OFF switch.
If OK, then check ESP(R) OFF switch referring to ESP OFF Switch Inspection ESP(R) OFF Switch Inspection.

Is it good condition?
YES
Go to Step 3.
NO
Replace ESP(R) OFF switch.

3. Check ESP(R) OFF switch circuit

Disconnect ESP(R) control module connector.
Check for proper connection to ESP(R) control module connector at "E08-30" terminal.
If OK, then check resistance between connector terminal "E08-30" and vehicle body ground.

Is resistance infinity?
YES
Substitute a known-good ESP(R) hydraulic unit / control module assembly and recheck.
NO
"GRN/YEL" wire circuit is shorted to ground.