0330379 JOHNSON CUP, Impeller

Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
168-3 Battery Potential / Power Input 1 : Voltage Above Normal The supply voltage to the TCM has exceeded 33.5 V. This code is reported by the TCM over the CAN data link (MID No. 094). The code is logged.
168-4 Battery Potential / Power Input 1 : Voltage Below Normal The supply voltage to the TCM has dropped below 16 V. This code is reported by the TCM over the CAN data link (MID No. 094). The code is logged.
2349-19 Engine Coolant Pump Outlet Temperature Sensor : Data Error The TCM reported that there is a problem with the circuit that is for the coolant temperature sensor. The problem is communicated to the ECM via the CAN data link. The code is logged.
The TCM commands the valve to the full open position.
2854-9 Coolant Temperature Control Module : Abnormal Update Rate The engine ECM did not receive the expected data link information from the controller for the TCM. The code is logged.
The TCM begins to regulate the coolant temperature to the default temperature.
4193-2 Engine Coolant Pump Outlet Temperature : Erratic, Intermittent, or Incorrect The TCM detects an intermittent problem in the circuit for the coolant temperature sensor. This code is reported by the TCM over the CAN data link (MID No. 094). The code is logged.
4193-3 Engine Coolant Pump Outlet Temperature : Voltage Above Normal The TCM detects an open circuit or a short to +Battery in the harness for the coolant temperature sensor. The three-way valve is commanded to the fault position. This code may be generated if the coolant temperature is less than −25° C (−13° F). This code is reported by the TCM over the CAN data link (MID No. 094). The code is logged.
The three-way valve is commanded to the fault position.
4193-4 Engine Coolant Pump Outlet Temperature : Voltage Below Normal The TCM detects a short to ground in the harness for the coolant temperature sensor. This code is reported by the TCM over the CAN data link (MID No. 094). The code is logged.
The three-way valve is commanded to the fault position. This engine is equipped with an electronic fluid temperature control system. The system is used to control the flow of coolant through the engine cooling system. There are two basic components of the system:
Illustration 1 g06268286
Location of the electronic fluid temperature control for the engine cooling system on the 794AC (right front view)
Illustration 2 g01640454
Components of the electronic fluid temperature control
(1) TCM
(2) Variable position electric motor
(3) Three-way valveTemperature Control Module (TCM) - The TCM receives a coolant temperature signal from the coolant temperature sensor that is installed in the outlet of the coolant pump. The TCM processes this input signal and outputs a voltage that is used to control the position of the coolant valve.Three-way Valve - The valve assembly consists of a fixed housing, a piston plate, and a variable position electric motor. The valve housing has inlet piping and outlet piping that attaches to the cooling system. The piston plate is internal to the valve and rides on a lead screw. The variable position electric motor drives the lead screw to adjust the piston within the housing. The electric motor receives a voltage signal from the TCM to turn the lead screw and adjust the coolant flow through the valve.For this application, the electronic fluid temperature control operates in a stand-alone mode. The temperature control module regulates the engine temperature to a default temperature of 78° C (172° F). The control system for the unit is preprogrammed to control the temperature of the engine coolant during all the possible engine operating conditions. The unit regulates the flow of coolant through the engine and the radiator to regulate the temperature of the engine coolant.The TCM communicates diagnostic codes to the service tool over the CAN data link. The TCM also communicates data that is related to the engine coolant temperature and fault conditions to the engine ECM via the CAN data link. If an electrical fault occurs in the circuit for the coolant temperature sensor, the temperature control module communicates the condition to the ECM. When an electrical fault is received by the ECM, a 2349-19 diagnostic code is activated.Note: Use Cat ET to clear diagnostic codes. Keyswitch power to the engine must be cycled to complete clearing of the codes from the TCM.
Illustration 3 g06267923
Schematic for the TCM
Illustration 4 g06267902
Fuse panel that is above the TCM
(4) T5 connection
(5) T6 connection
Illustration 5 g01619831
Location of the machine interface connectors (typical left rear engine view)
(6) Machine interface connector
Illustration 6 g01640434
Location of the temperature sensor at the outlet of the coolant pump (left front engine view)
(7) Temperature sensor at the outlet of the coolant pump
Illustration 7 g01641094
Location of the harness connectors at the TCM
(8) Harness connectors at the TCM