Diagnostic Test

CHECK ENGINE COOLING SYSTEM
1. Perform Engine Cooling System diagnostics in accordance with the Service Information.
  Is the Engine Cooling System functioning properly?
  
  Yes
  - Go To 2.
  No
  - Repair the cause of the engine overheating. Refer to the appropriate Service Information for the related diagnostic or repair procedures.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. Refer to 42RLE TRANSMISSION VERIFICATION TEST .
TRANSMISSION OIL COOLER RESTRICTED
1. Check the Transmission Oil Cooler Flow in accordance with the Service Information.
  Is the transmission oil cooler restricted or plugged?
  
  Yes
  - Repair the cause of the plugged Transmission Oil Cooler as necessary and repair or replace the Transmission Oil Cooler in accordance with the Service Information.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. Refer to 42RLE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 3.
HIGH TEMPERATURE OPERATION
1. This DTC is an informational DTC designed to aid the Technician in diagnosing shift quality complaints.
2. This DTC indicates that the transmission has been operating in the "Overheat" shift schedule which may generate a customer complaint.
3. The customer driving patterns may indicate the need for an additional transmission oil cooler.
4. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.
5. Check for any Service Information Tune-ups or Service Bulletins for any possible causes that may apply.
  Repair
  - Repair the cause of transmission overheating in accordance with the Service Information.
  - Perform 42RLE TRANSMISSION VERIFICATION TEST. Refer to 42RLE TRANSMISSION VERIFICATION TEST .