Mopar1973Man

P0218 - Transmission High Temperature Operation Activated Theory of Operation The DTC is intended as an informational DTC to aid the technician in determining the root cause of a customer dirveability issue. The DTC is also intended to alert the technician to determine if a cooling system malfunction has occurred or if an additional transmission air to oil cooler is needed to support the customers driving behavior. When Monitored and Set Conditions When Monitored: • This diagnostic runs continuously when the Engine is running. Set Conditions: • Transmission temperature exceeds 116° C or 240° F Default Actions: • Overheat shift schedule is activated. Possible Causes HIGH TEMPERATURE OPERATION ACTIVATED TORQUE CONVERTER CLUTCH SLIPPING / NOT ACTIVATING OPERATING VEHICLE WITH TRANSMISSION IN LIMP-IN MODE FOR AN EXTENDED PERIOD OF TIME RESTRICTED TRANSMISSION COOLER OR COOLER LINE TRANSMISSION BYPASS COOLER VALVE (THERMOSTAT) EXCESSIVE TIME IDLING IN GEAR Always perform the Transmission PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure). HIGH TEMPERATURE OPERATION NOTE: This DTC is an informational DTC designed to aid the Technician in diagnosing shift quality complaints. NOTE: This DTC indicates that the transmission has been operating in the "Overheat" shift schedule which may generate a customer complaint. NOTE: The customer driving patterns may indicate the need for an additional transmission oil cooler. NOTE: If the Transmission has experienced a catastrophic failure, the Transmission Cooler must be replaced. 1. Verify proper Engine cooling system operation which would affect proper transmission operation. 2. Verify proper operation of the Transmission Bypass Cooler Valve (Thermostat). (Refer to 07 - Cooling/Transmission/COOLER, Transmission Oil/Operation) . 3. Verify the Transmission Cooler and Cooler Lines are not restricted. 4. Verify proper torque converter clutch operation. 5. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set. Were any of the above problems identified as the probable cause? Yes • Repair the cause of transmission overheating. Perform the PRELIMINARY CHECKS procedure. (Refer to 07 - Cooling - Diagnosis and Testing) . Make sure to check for any Service Bulletins pertaining to this problem. • Perform the TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure). No • Perform the TRANSMISSION VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure). • Test Complete.

P0217 - Coolant Temperature Too High Theory of Operation The Coolant Temperature Sensor is a variable resistor sensor and is used to measure the temperature of the coolant of the engine. The PCM supplies 5-Volts to the Engine Coolant Temperature Sensor (ECT) Signal circuit. The PCM monitors the change in voltage caused by changes in the resistance of the sensor to determine the coolant temperature. The engine coolant temperature value is used by the PCM for the engine protection system and engine emissions control. The Engine Coolant Temperature Sensor is located near the thermostat housing. This fault becomes active when the PCM detects a coolant temperature higher than a calibrated limit for a calibrated amount of time. The PCM illuminates the MIL lamp after the diagnostic runs and fails once. During this time the customer may experience an engine power derate, and regeneration mode will be disabled. The PCM will turn off the MIL lamp after the diagnostic runs and passes in four consecutive drive cycles. When Monitored: While the engine is running. Set Condition: The engine coolant temperature is above a calibrated value for a calibrated amount of time. Possible Causes COOLING SYSTEM FAILURE ECT SENSOR MECHANICAL FAILURE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC- Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure). 1. COOLING SYSTEM FAILURE NOTE: If other cooling system DTCs are present, repair those DTCs before proceeding. 1. Check the engine cooling system operation. Refer to cooling, Diagnosis and Testing, Preliminary check. (Refer to 07 - Cooling - Diagnosis and Testing) . Is the Cooling system operating normally? Yes Go To 2 No Repair the cooling system failure. Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure). 2. CHECK THE ECT SENSOR 1. Allow the engine to reach normal operating temperature. 2. Use a temperature probe and measure the engine temperature near the ECT Sensor. 3. With the scan tool, read the Engine Coolant Temperature. 4. Compare the temperature probe reading with the scan tool reading. Are the readings within 10°F of each other? Yes Repair the cause of mechanical failure. Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure). No Replace the Engine Coolant Temperature Sensor in accordance with the Service Information.(Refer to 07 - Cooling/Engine/SENSOR, Coolant Temperature/Removal) Perform the POWERTRAIN VERIFICATION TEST - 6.7L. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).