With Manufacturer's Scantool

Diagnostic Chart:

** NOTES:

EATX Controller DTC Present trouble code, with the DRBIII or equivalent scan tool, go to Transmission Control Systems/Testing and Inspection.

Engine Is Cold Too Long trouble code, the engine does not warm to 176°F while driving for 20 minutes after start.
- Check the thermostat.

For the following trouble codes:
- Fuel Level Sending Unit Volts Too High
- Fuel Level Sending Unit Volts Too Low
- Fuel Level Unit No Change Over Miles
Use a scan tool and follow the appropriate tests for the fuel level sending unit.

Internal Controller Failure trouble code, replace the powertrain control module and go to Verification TEST VER-2A. Verification Test VER-2A - Road Test Verification

PCM Failure SPI Communications trouble code, replace the powertrain control module and go to Verification TEST VER-2A. Verification Test VER-2A - Road Test Verification

NOTE: Code 12 is normal and Code 55 signifies end of Codes.