Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 75.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK FOR OTHER DTCS
NOTE:
Make sure the coolant level and condition are within specifications before continuing with this Diagnostic.

NOTE:
DANGER: Never open the cooling system when the engine is hot. The system is under pressure. Failure to follow these instructions can result in personal injury including extreme burns, scalding, or fatal injury. Allow the engine to cool before opening the cooling system.
1. Refer to the recorded DTCs.
  Are there any Engine Coolant Temperature, Ambient Air Temperature, Camshaft Position, or Crankshaft Position Sensor DTCs active or pending?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to DTC INDEX (1 OF 2) and/or DTC INDEX (2 OF 2) .
  No
  - Go To 3
CHECK THE COOLANT LEVEL AND CONDITION
WARNING:
Never open the cooling system when the engine is hot. The system is under pressure. Extreme burns or scalding may result. Failure to follow these instructions can result in possible serious or fatal injury. Allow the engine to cool before opening the cooling system.
1. Inspect the Engine Coolant for proper level and condition. Refer to ENGINE COOLING, DIAGNOSIS AND TESTING .
  Is the Engine Coolant at the proper level and condition?
  
  Yes
  - Go To 4
  No
  - Repair the Engine Coolant level or condition problem. Inspect the vehicle for coolant leaks and repair if necessary. Fill the Engine Coolant to the proper level and ensure the proper condition. Refer to ENGINE COOLING, STANDARD PROCEDURE - FILLING .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
CHECK THE THERMOSTAT FOR PROPER OPERATION
NOTE:
This test works best if performed on a cold engine (cold soak).
1. Ignition on, engine not running.
2. With the scan tool, read the ECT Deg value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a value that is somewhere close to the ambient temperature.
3. Start the Engine.
4. During engine warm-up, monitor the ECT Temperature value on the scan tool. The temperature value change should be a smooth transition from start up to normal operating temp 88°C (190°F). Also monitor the actual coolant temperature with a thermometer.
  NOTE:
  As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the scan tool, ECT Temperature value should stay relatively close to each other.
5. Using the appropriate service information, determine the proper opening temperature of the thermostat.
  Did the Thermostat open at the proper temperature?
  
  Yes
  - Go To 5
  No
  - Replace the Thermostat in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
CHECK THE RADIATOR FOR RESTRICTIONS AND FLOW
NOTE:
The engine must be running and the Thermostat open to perform this test.
1. Check and compare the temperatures at the inlet and outlet of the Radiator. Check for proper operation of the entire cooling system. Be certain to check for proper operation of the Radiator Cap. Check for proper flow through the Radiator and anything that can cause a lack of system pressure or lack of coolant flow in the system which include air in the cooling system, proper operation of the Water Pump and drive belt, restricted Radiator core, collapsed hose restricting flow, etc.
  NOTE:
  It is normal to see a lower temperature on the outlet of the Radiator, however a very large difference could indicate a restriction in the Radiator. This condition can cause this DTC to set due to the position of the ETC Sensor in the coolant system. If necessary, compare the temperature difference with a similar vehicle.
  
  Was the difference in the temperature readings relatively larger than expected?
  
  Yes
  - Check the cooling system and Radiator for proper flow and repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Thermostat in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .