DTC Troubleshooting
DIAGNOSTICS PROCEDURE CHART
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | Was "ESP® System Check" performed? | Go to Step 2. | Go to ESP® SYSTEM CHECK . |
| 2 | DTC check
Is there DTC(s) other than C1090, C1091 or C1094? |
Go to APPLICABLE DTC TROUBLESHOOTING . | Go to Step 3. |
| 3 | DTC check for ECM
Is DTC U0073 or U0121 detected? |
Go to DTC U0073 or DTC U0121 . | Substitute a known-good ESP® control module and recheck DTC, see ESP® HYDRAULIC UNIT/CONTROL MODULE ASSEMBLY REMOVAL AND INSTALLATION . |