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DTC Troubleshooting

C1027: SYMPTOM TROUBLESHOOTING REFERENCE CHART

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 
  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 3. Replace ESP® OFF switch.
3  Check ESP® OFF switch circuit 
  1. Disconnect ESP® control module connector.
  2. Check for proper connection to ESP® control module connector at "E08-30" terminal.
  3. If OK, then check resistance between connector terminal "E08-30" and vehicle body ground.

Is resistance infinity? 		 Substitute a known-good ESP® hydraulic unit/control module assembly and recheck. "GRN/YEL" wire circuit is shorted to ground.
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