Circuit/System Verification
- Ignition - On/Vehicle - In Service Mode
- Verify there are no other DTCs set, except for DTC P156D.
- If any other DTCs are set
- Go to next step: If only DTC P156D is set
- Replace the component:T19 Power Supply Transformer
- Verify the DTC does not set.
- If the DTC sets - Replace the component: K20 Engine Control Module
- Go to next step: If the DTC does not set
- All OK.