844K Wheel Dozer Caterpillar

Diagnostic Trouble Codes

Usage:

844K K4Y

Transmission ECM

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Table 1
Transmission ECM (MID 81)
DTC	Description	Procedure
41-3	8 VDC Power Supply: Voltage Above Normal	Sensor Supply - Test
41-4	8 VDC Power Supply: Voltage Below Normal	Sensor Supply - Test
70-2	Parking Brake Switch: Data Erratic, Intermittent, or Incorrect	Operator Control Switch (Switch to Ground) - Test
96-3	Fuel Level Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
96-4	Fuel Level Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
96-8	Fuel Level Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
144-3	Backup Alarm Relay: Voltage Above Normal	Relay - Test
144-6	Backup Alarm Relay: Current Above Normal	Relay - Test
168-3	Electrical System Voltage: Voltage Above Normal	Electrical Power Supply - Test
168-4	Electrical System Voltage: Voltage Below Normal	Electrical Power Supply - Test
177-3	Transmission Oil Temperature Sensor: Voltage Above Normal	Sensor Signal (Analog, Passive) - Test
177-4	Transmission Oil Temperature Sensor: Voltage Below Normal	Sensor Signal (Analog, Passive) - Test
190-8	Engine Speed Sensor: Abnormal Frequency, Pulse Width, or Period	Speed Sensor - Test
262-3	5 VDC Sensor Power Supply: Voltage Above Normal	Sensor Supply - Test
262-4	5 VDC Sensor Power Supply: Voltage Below Normal	Sensor Supply - Test
348-3	Transmission Lockout Switch: Voltage Above Normal	Operator Control Switch (Switch to Ground) - Test
348-4	Transmission Lockout Switch: Voltage Below Normal	Operator Control Switch (Switch to Ground) - Test
427-3	Front Axle Oil Temperature Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
427-4	Front Axle Oil Temperature Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
427-8	Front Axle Oil Temperature Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
428-3	Rear Axle Oil Temperature Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
428-4	Rear Axle Oil Temperature Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
428-8	Rear Axle Oil Temperature Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
444-3	Starter Motor Relay: Voltage Above Normal	Relay - Test
444-6	Starter Motor Relay: Current Above Normal	Relay - Test
585-8	Transmission Output Speed Sensor: Abnormal Frequency, Pulse Width, or Period	Speed Sensor - Test
590-9	Engine Control Module: Abnormal Update Rate	CAN Data Link - Test
590-14	Engine Control Module: Special Instruction	CAN Data Link - Test
596-9	Implement Control: Abnormal update Rate	CAN Data Link - Test
596-14	Implement Control: Special Instruction	CAN Data Link - Test
621-3	Downshift Switch: Voltage Above Normal	This switch is integrated into the joystick and requires specific Troubleshooting. ⁽¹⁾
621-4	Downshift Switch: Voltage Below Normal	This switch is integrated into the joystick and is not serviceable.⁽¹⁾
622-3	Upshift Switch: Voltage Above Normal	This switch is integrated into the joystick and is not serviceable.⁽²⁾
622-4	Upshift Switch: Voltage Below Normal	This switch is integrated into the joystick and is not serviceable.⁽²⁾
623-3	Directional Switch: Voltage Above Normal	This switch is integrated into the joystick and is not serviceable. ⁽³⁾
623-4	Directional Switch: Voltage Below Normal	This switch is integrated into the joystick and is not serviceable. ⁽³⁾
626-3	Steering/Transmission Lock Switch: Voltage Above Normal	Operator Control Switch (Switch to Ground) - Test
626-4	Steering/Transmission Lock Switch: Voltage Below Normal	Operator Control Switch (Switch to Ground) - Test
669-8	Transmission Input Speed Sensor: Abnormal Frequency, Pulse Width, or Period	Speed Sensor - Test
673-8	Transmission Output Speed Sensor #2: Abnormal Frequency, Pulse Width, or Period	Speed Sensor - Test
678-3	Torque Converter Impeller Clutch Solenoid: Voltage Above Normal	Solenoid Valve - Test
678-5	Torque Converter Impeller Clutch Solenoid: Current Below Normal	Solenoid Valve - Test
678-6	Torque Converter Impeller Clutch Solenoid: Current Above Normal	Solenoid Valve - Test
678-13	Torque Converter Impeller Clutch Solenoid: Calibration Required	Solenoid Valve - Test
679-3	Torque Converter Lockup Clutch Solenoid: Voltage Above Normal	Solenoid Valve - Test
679-5	Torque Converter Lockup Clutch Solenoid: Current Below Normal	Solenoid Valve - Test
679-6	Torque Converter Lockup Clutch Solenoid: Current Above Normal	Solenoid Valve - Test
679-13	Torque Converter Lockup Clutch Solenoid: Calibration Required	Solenoid Valve - Test
681-3	Parking Brake Solenoid: Voltage Above Normal	Solenoid Valve - Test
681-5	Parking Brake Solenoid: Current Below Normal	Solenoid Valve - Test
681-6	Parking Brake Solenoid: Current Above Normal	Solenoid Valve - Test
681-7	Parking Brake Solenoid: Mechanical System Not Responding Properly	Solenoid Valve - Test
826-3	Torque Converter Oil Temperature Sensor: Voltage Above Normal	Sensor Signal (Analog, Passive) - Test
826-4	Torque Converter Oil Temperature Sensor: Voltage Below Normal	Sensor Signal (Analog, Passive) - Test
871-9	Inclination Sensor: Abnormal Update Rate	CAN Data Link - Test
967-9	Machine Application: Abnormal Update Rate	CAN Data Link - Test
967-14	Machine Application: Special Instruction	CAN Data Link - Test
1326-2	ECM Location Code: Data Erratic, Intermittent, or Incorrect	ECM Location Code - Test
1401-3	Transmission Solenoid 1: Voltage Above Normal	Solenoid Valve - Test
1401-5	Transmission Solenoid 1: Current Below Normal	Solenoid Valve - Test
1401-6	Transmission Solenoid 1: Current Above Normal	Solenoid Valve - Test
1402-3	Transmission Solenoid 2: Voltage Above Normal	Solenoid Valve - Test
1402-5	Transmission Solenoid 2: Current Below Normal	Solenoid Valve - Test
1402-6	Transmission Solenoid 2: Current Above Normal	Solenoid Valve - Test
1403-3	Transmission Solenoid 3: Voltage Above Normal	Solenoid Valve - Test
1403-5	Transmission Solenoid 3: Current Below Normal	Solenoid Valve - Test
1403-6	Transmission Solenoid 3: Current Above Normal	Solenoid Valve - Test
1404-3	Transmission Solenoid 4: Voltage Above Normal	Solenoid Valve - Test
1404-5	Transmission Solenoid 4: Current Below Normal	Solenoid Valve - Test
1404-6	Transmission Solenoid 4: Current Above Normal	Solenoid Valve - Test
1405-3	Transmission Solenoid 5: Voltage Above Normal	Solenoid Valve - Test
1405-5	Transmission Solenoid 5: Current Below Normal	Solenoid Valve - Test
1405-6	Transmission Solenoid 5: Current Above Normal	Solenoid Valve - Test
1712-3	Torque Converter Pedal Position Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
1712-4	Torque Converter Pedal Position Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
1712-8	Torque Converter Pedal Position Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
1712-13	Torque Converter Pedal Position Sensor: Calibration Required	Sensor Signal (PWM) - Test
1834-2	Ignition Key Switch: Data Erratic, Intermittent, or Incorrect	Switch Circuits - Test
2448-9	Graphical Display Module: Abnormal Update Rate	CAN Data Link - Test
2448-14	Graphical Display Module: Special Instruction	CAN Data Link - Test
2678-3	Access Platform Position Switch: Voltage Above Normal (AKA - Stairway Position Switch)	Operator Control Switch (Switch to Ground) - Test
2678-4	Access Platform Position Switch: Voltage Below Normal (AKA - Stairway Position Switch)	Operator Control Switch (Switch to Ground) - Test
2825-3	Axle Oil Cooler Bypass Solenoid: Voltage Above Normal	Solenoid Valve - Test
2825-5	Axle Oil Cooler Bypass Solenoid: Current Below Normal	Solenoid Valve - Test
2825-6	Axle Oil Cooler Bypass Solenoid: Current Above Normal	Solenoid Valve - Test
2974-3	Brake Charge Pressure Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
2974-4	Brake Charge Pressure Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
2974-8	Brake Charge Pressure Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
2976-3	Parking Brake Oil Temperature Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
2976-4	Parking Brake Oil Temperature Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
2976-8	Parking Brake Oil Temperature Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
2984-3	Auto Lube Pump Outlet Pressure Sensor: Voltage Above Normal	Sensor Signal (Analog, Active) - Test
2984-4	Auto Lube Pump Outlet Pressure Sensor: Voltage Below Normal	Sensor Signal (Analog, Active) - Test
3440-3	Front Service Brake Oil Pressure Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
3440-4	Front Service Brake Oil Pressure Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
3440-8	Front Service Brake Oil Pressure Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
3442-3	Rear Service Brake Oil Pressure Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
3442-4	Rear Service Brake Oil Pressure Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
3442-8	Rear Service Brake Oil Pressure Sensor : Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
3467-3	Main Power Relay: Voltage Above Normal	Relay - Test
3467-5	Main Power Relay: Current Below Normal	Relay - Test
3467-6	Main Power Relay: Current Above Normal	Relay - Test
3470-3	Machine Power Distribution Relay: Voltage Above Normal	Relay - Test
3470-5	Machine Power Distribution Relay: Current Below Normal	Relay - Test
3470-6	Machine Power Distribution Relay: Current Above Normal	Relay - Test
3583-9	Switch Panel #1: Abnormal Update Rate	CAN Data Link - Test
3702-3	Service Brake Pressure Sensor: Voltage Above Normal (AKA - Park Brake Oil Pressure Sensor)	Sensor Signal (PWM) - Test
3702-4	Service Brake Pressure Sensor: Voltage Below Normal (AKA - Park Brake Oil Pressure Sensor)	Sensor Signal (PWM) - Test
3702-8	Service Brake Pressure Sensor: Abnormal Frequency, Pulse Width, or Period (AKA - Park Brake Oil Pressure Sensor)	Sensor Signal (PWM) - Test
3797-3	Operator Seat Belt Switch: Voltage Above Normal	Operator Control Switch (Switch to Ground) - Test
3797-4	Operator Seat Belt Switch: Voltage Below Normal	Operator Control Switch (Switch to Ground) - Test

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⁽¹⁾	Use the Test Steps from the "Switch Circuits - Test" section of this manual to check the wiring harness. Check the condition between pin 7 and pin 8 (at the joystick. If no problem is found, replace the joystick.
⁽²⁾	Use the Test Steps from the "Switch Circuits - Test" section of this manual to check the wiring harness. Check the condition between pin 5 and pin 6 (at the joystick) and the ECM. If no problem is found, replace the joystick.
⁽³⁾	Use the Test Steps from the "Switch Circuits - Test" section of this manual to check the wiring harness. Check the condition between pin 3 and pin 4 (at the joystick) and the ECM. If no problem is found, replace the joystick.

The following table lists the diagnostic codes for the Implement ECM (MID 82). When a diagnostic code becomes active, refer to the Troubleshooting section of this manual for a specific troubleshooting procedure.

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Table 2
Implement ECM (MID 82)
DTC	Description	Procedure
41-3	8 VDC Supply: Voltage Above Normal	Sensor Supply - Test
41-4	8 VDC Supply: Voltage Below Normal	Sensor Supply - Test
75-3	Steering Oil Temperature Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
75-4	Steering Oil Temperature Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
75-8	Steering Oil Temperature Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
168-3	Electrical System Voltage: Voltage Above Normal	Electrical Power Supply - Test
168-4	Electrical System Voltage: Voltage Below Normal	Electrical Power Supply - Test
262-3	5 VDC Sensor Power Supply: Voltage Above Normal	Sensor Supply - Test
262-4	5 VDC Sensor Power Supply: Voltage Below Normal	Sensor Supply - Test
268-2	Programmed Parameter Fault: Data Erratic, Intermittent, or Incorrect	Parameter - Test
290-3	Engine Cooling Fan Pump Pressure Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
290-4	Engine Cooling Fan Pump Pressure Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
290-8	Engine Cooling Fan Pump Pressure Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
296-9	Transmission Control: Abnormal Update Rate	CAN Data Link - Test
296-14	Transmission Control: Special Instruction	CAN Data Link - Test
358-3	Implement Pilot Pressure Supply Solenoid: Voltage Above Normal	Solenoid Valve - Test
358-5	Implement Pilot Pressure Supply Solenoid: Current Below Normal	Solenoid Valve - Test
358-6	Implement Pilot Pressure Supply Solenoid: Current Above Normal	Solenoid Valve - Test
434-3	Hydraulic Pilot Oil Pressure Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
434-4	Hydraulic Pilot Oil Pressure Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
434-8	Hydraulic Pilot Oil Pressure Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
490-3	Implement Lockout Switch: Voltage Above Normal	Operator Control Switch (Switch To Ground) - Test
490-4	Implement Lockout Switch: Voltage Below Normal	Operator Control Switch (Switch To Ground) - Test
497-3	Tilt Right Solenoid: Voltage Above Normal	Solenoid Valve - Test
497-5	Tilt Right Solenoid: Current Below Normal	Solenoid Valve - Test
497-6	Tilt Right Solenoid: Current Above Normal	Solenoid Valve - Test
497-13	Tilt Right Solenoid: Out of Calibration	Solenoid Valve - Test
498-3	Tilt Left Solenoid: Voltage Above Normal	Solenoid Valve - Test
498-5	Tilt Left Solenoid: Current Below Normal	Solenoid Valve - Test
498-6	Tilt Left Solenoid: Current Above Normal	Solenoid Valve - Test
498-13	Tilt Left Solenoid: Out of Calibration	Solenoid Valve - Test
590-9	Engine Control Module: Abnormal Update Rate	CAN Data Link - Test
590-14	Engine Control Module: Special Instruction	CAN Data Link - Test
600-3	Hydraulic Oil Temperature Sensor: Voltage Above Normal	Sensor Signal (Analog, Passive) - Test
600-4	Hydraulic Oil Temperature Sensor: Voltage Below Normal	Sensor Signal (Analog, Passive) - Test
767-3	Fixed Implement Pump Oil Pressure Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
767-4	Fixed Implement Pump Oil Pressure Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
767-8	Fixed Implement Pump Oil Pressure Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
779-3	Cab Air Temperature Sensor: Voltage Above Normal	Sensor Signal (Analog, Passive) - Test
779-4	Cab Air Temperature Sensor: Voltage Below Normal	Sensor Signal (Analog, Passive) - Test
967-9	Machine Application: Abnormal Update Rate	CAN Data Link - Test
967-14	Machine Application: Special Instruction	CAN Data Link - Test
1047-3	Blade Single Tilt Solenoid: Voltage Above Normal	Solenoid Valve - Test
1047-5	Blade Single Tilt Solenoid: Current Below Normal	Solenoid Valve - Test
1047-6	Blade Single Tilt Solenoid: Current Above Normal	Solenoid Valve - Test
1197-3	Blade Lower Solenoid: Voltage Above Normal	Solenoid Valve - Test
1197-5	Blade Lower Solenoid: Current Below Normal	Solenoid Valve - Test
1197-6	Blade Lower Solenoid: Current Above Normal	Solenoid Valve - Test
1197-13	Blade Lower Solenoid: Out of Calibration	Solenoid Valve - Test
1198-3	Blade Raise Solenoid: Voltage Above Normal	Solenoid Valve - Test
1198-5	Blade Raise Solenoid: Current Below Normal	Solenoid Valve - Test
1198-6	Blade Raise Solenoid: Current Above Normal	Solenoid Valve - Test
1198-13	Blade Raise Solenoid: Out of Calibration	Solenoid Valve - Test
1326-2	ECM Location Code: Data Erratic, Intermittent, or Incorrect	ECM Location Code - Test
1482-3	10 VDC Sensor Power Supply: Voltage Above Normal	Sensor Supply - Test
1482-4	10 VDC Sensor Power Supply: Voltage Above Normal	Sensor Supply - Test
2357-3	Air Conditioner Evaporator Coil Temperature Sensor: Voltage Above Normal	Sensor Signal (Analog, Passive) - Test
2357-4	Air Conditioner Evaporator Coil Temperature Sensor: Voltage Below Normal	Sensor Signal (Analog, Passive) - Test
2475-3	Right Joystick Forward/Reverse Position Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
2475-4	Right Joystick Forward/Reverse Position Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
2475-8	Right Joystick Forward/Reverse Position Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
2475-13	Right Joystick Forward/Reverse Position Sensor: Out of Calibration	Sensor Signal (PWM) - Test
2477-3	Right Joystick Left/Right Position Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
2477-4	Right Joystick Left/Right Position Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
2477-8	Right Joystick Left/Right Position Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
2477-13	Right Joystick Left/Right Position Sensor: Out of Calibration	Sensor Signal (PWM) - Test
2659-2	Cab Air Temperature Control Switch: Data Erratic, Intermittent, or Incorrect	This switch is integrated into a panel and requires specific Troubleshooting.⁽¹⁾
2661-3	Cab Air Temperature Control: Voltage Above Normal	This switch is integrated into a panel and requires specific Troubleshooting.⁽¹⁾
2661-4	Cab Air Temperature Control: Voltage Below Normal	This switch is integrated into a panel and requires specific Troubleshooting.⁽¹⁾
2663-3	Cab Ventilation Duct Temperature Sensor: Voltage Above Normal	Sensor Signal (Analog, Passive) - Test
2663-4	Cab Ventilation Duct Temperature Sensor: Voltage Below Normal	Sensor Signal (Analog, Passive) - Test
2671-3	Air Conditioner Compressor Clutch Solenoid: Voltage Above Normal	Solenoid Valve - Test
2671-5	Air Conditioner Compressor Clutch Solenoid: Current Below Normal	Solenoid Valve - Test
2671-6	Air Conditioner Compressor Clutch Solenoid: Current Above Normal	Solenoid Valve - Test
2811-3	Cab Blower Speed Control: Voltage Above Normal	This switch is integrated into a panel and requires specific Troubleshooting.⁽²⁾
2811-4	Cab Blower Speed Control: Voltage Below Normal	This switch is integrated into a panel and requires specific Troubleshooting.⁽²⁾
3516-3	Blade Tip Solenoid: Voltage Above Normal	Solenoid Valve - Test
3516-5	Blade Tip Solenoid: Current Below Normal	Solenoid Valve - Test
3516-6	Blade Tip Solenoid: Current Above Normal	Solenoid Valve - Test
3998-3	Right Joystick Thumb Rocker Position Sensor: Voltage Above Normal	Sensor Signal (PWM) - Test
3998-4	Right Joystick Thumb Rocker Position Sensor: Voltage Below Normal	Sensor Signal (PWM) - Test
3998-8	Right Joystick Thumb Rocker Position Sensor: Abnormal Frequency, Pulse Width, or Period	Sensor Signal (PWM) - Test
3998-13	Right Joystick Thumb Rocker Position Sensor: Out of Calibration	Sensor Signal (PWM) - Test
3999-3	Right Joystick Trigger Switch: Voltage Above Normal	Operator Control Switch (Switch to Ground) - Test
3999-4	Right Joystick Trigger Switch: Voltage Below Normal	Operator Control Switch (Switch to Ground) - Test

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⁽¹⁾	Use the Test Steps from the "Switch Circuits - Test" section of this manual to troubleshoot the circuit. Check the condition of the harness between pin 5 and pin 6 (at the control panel), and the ECM. If no problem is found, replace the panel.
⁽²⁾	Use the Test Steps from the "Switch Circuits - Test" section of this manual to troubleshoot the circuit. Check the condition of the harness between pin 4 and pin 6 (at the control panel), and the ECM. If no problem is found, replace the panel.