621K OEM Wheel Tractor-Scraper Event Codes Caterpillar


Event Codes
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1.1. Warning Levels
2.2. Level 1
3.2. Level 2
4.2. Level 2S
5.2. Level 3
6.1. Indications and System Response
7.2. Message Display
8.2. Caterpillar Electronic Technician (Cat<SUP>&reg;</SUP> ET) Service Tool
9.3. Logged Event Codes
10.1. Troubleshooting
11.1. Transmission/Chassis ECM Event Code List
12.1. Implement ECM Event Code List

Event codes alert the operator or the technician that an abnormal operating condition exists in one of the machine systems.



Illustration 1g03351701
Illustration of the message display for 621K OEM Wheel Tractor

When any ECM module activates an event code, the operator will be alerted by the message display. Most active events will be logged by the ECM. Some events are only active. The active events and the logged events can be viewed with the Display or the AVSpare Electronic Technician (Cat® ET) service tool.

Warning Levels

The ECM will assign one of the four warning levels to an active event code according to the severity of the abnormal system condition. Each warning level requires a specific response from the operator. The warning levels and required operator response are listed below.

Level 1

Warning level 1 alerts the operator that a machine system requires attention. The operator should check the condition of the involved system. The operator should perform maintenance on the involved system at the earliest possible time.

Level 2

Warning level 2 requires changing the operation of the machine or performing a maintenance procedure. Failure to correct the problem that caused this warning may damage the involved components of the machine system.

Level 2S

The Warning level 2S requires an immediate change in machine operation to avoid possible damage to the system of the machine.

Level 3

Warning level 3 requires an immediate safe shutdown of the machine to avoid damage to the machine or injury to personnel near the machine. The problem that caused the event must be corrected before machine operation can resume.

Indications and System Response

Message Display

The Display will alert the operator when an event code is active. Event codes are activated in one of four warning levels according to the severity of the condition.

The warning indicators of the subsystem on the Message Display will illuminate when an EID is activated for a particular subsystem. When level 1 events are active, the warning indicator of the subsystem will be the only type of indicator that will illuminate.

The action indicator will flash red when a level 2 warning or level 3 warning is active.

The action alarm is driven as an output directly from the Message Display. If a level 3 warning is active, the action alarm will sound a tone that is pulsing. The action alarm will sound these tones to alert the machine operator that immediate action is required.

If two warnings of a different level are active at the same time, the highest level warning will be displayed.

The response of the Display to these warning levels is shown in the following table.

Table 1
WARNING OPERATION 
Warning Level  Warning Indications  Required Action of Operator  Possible Result (1) 
Warning Indicators Action Indicator  Sounds Action Alarm 
OFF(2)  OFF  OFF  No immediate action is required. The system needs attention soon.  No harmful effects or no damaging effects 
ON  Flash ON and OFF  OFF  Change machine operation or perform maintenance to the system.  Damage to system components 
2-S  ON  ON  ON  Immediately change the machine operation.  Severe damage to system components 
ON  Flash ON and OFF  Pulse ON and OFF  Immediately perform a safe engine shutdown.  Injury to operator or severe damage to components 
(1) Possible result if no action is taken by the operator.
(2) If applicable, will be indicated by a Pop-Up Text Display

AVSpare Electronic Technician (Cat® ET) Service Tool

When an abnormal operating condition occurs, the status screen on the Cat® ET service tool indicates an active event.

Event codes are displayed on Cat® ET in the following format:

"EXXX (X) Description"

The "E" means that the code is an event code. The "XXXX" is a numeric identifier. "(X)" is the warning level and is followed by the description of the code.

Active event codes are listed in ascending numerical order. The code with the lowest number is listed first. The active event code is removed from the list when the condition is no longer present.

Logged Event Codes

Some event codes are logged in the ECM memory. Some event codes are active only. The logged event codes are listed in chronological order. The most recent code is listed first.

A logged code is cleared from memory when one of the following conditions occur:

  • The service technician manually clears the code.

  • The code does not reoccur for 1000 hours.

  • A new code is logged and there are already ten logged codes in memory. In this case, the oldest logged code is cleared.

Note: Always clear logged event codes after investigating and correcting the problem which generated the code.

Troubleshooting

Perform the following steps to troubleshoot an event:

  1. Obtain the following information from the operator:

    • The event and the time of the event.

    • Determine the engine operating conditions at the time of the event. Conditions such as engine rpm and load may be important.

    • Determine if there are any systems that were installed by the dealer or by the customer that could cause the event.

  2. Verify that the event is not due to normal machine operation. Verify that the event is not due to an error by the operator.

  3. Check all fluid levels and all oil levels.

  4. Troubleshoot and repair any active diagnostic codes.

Transmission/Chassis ECM Event Code List

The following table lists the event codes that apply to the Transmission/Chassis control system. The recommended response is listed. Use Cat® ET to determine if the event codes are active or logged.

Table 2
Event Codes For Transmission/Chassis ECM (MID 27) 
EID (Level)  Description  Possible Cause or Recommended Response 
E49 (2)  Coast in Neutral Warning  Probable Cause: Excessive machine speed in neutral.

Recommended Actions:Ensure that transmission is in gear while moving. 
E106 (2)  High Front Brake Oil Temperature  Probable Cause: Underuse of engine braking.

Recommended Actions: Increase the engine braking level through keypad. 
E106 (3)  High Front Brake Oil Temperature  Immediately Safely Shutdown Machine, allow brakes to cool before resuming operation.

Probable Cause: Underuse of engine braking.

Recommended Actions: Increase the engine braking level through keypad. 
E107 (2)  High Rear Brake Oil Temperature  Probable Cause: Underuse of engine braking.

Recommended Actions: Increase the engine braking level through keypad. 
E107 (3)  High Rear Brake Oil Temperature  Immediately Safely Shutdown Machine, allow brakes to cool before resuming operation

Probable Cause: Underuse of engine braking.

Recommended Actions: Increase the engine braking level through keypad. 
E119 (1)  Low Fuel Level  Probable Cause: (1) Fuel level low (2) 10 V sensor supply is faulted.

Recommended Actions:(1) Refuel the machine at the earliest (2) Inspect the wiring for the 10V sensor and correct the wiring if faulted. 
E119 (2)  Low Fuel Level  Probable Cause: (1) Fuel level low (2) 10 V sensor supply is faulted.

Recommended Actions:(1) Refuel the machine at the earliest (2) Inspect the wiring for the 10 V sensor and correct the wiring if faulted. 
E155 (2)  High Torque Converter Oil Temperature  Probable Cause: Extended dig operation. Event is logged when the torque converter oil (TCO) temperature exceeds 125° C (257° F).

Recommended Actions: Change machine operation to allow Torque Converter Oil (TCO) to cool. If needed, park the machine and set engine at high idle until TCO temp event clears. Once activated, the level 2 event shall not become inactive until the TCO temp reduces to less than 125° C (257° F)
E155 (3)  High Torque Converter Oil Temperature  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: Temperature of the oil has reached a critical level. 129° C (264° F). If the code is recurring regularly, a damaged or collapsed hose may be the cause of the problem.

Recommended Actions: Immediately move machine to a safe location. Shut down machine. Allow oil to cool to less than 129° C (264° F) before resuming operations. 
E192 (3)  Steering system malfunction  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: Secondary steering pump relay faulted.

Recommended Actions: Check troubleshooting for CID - 420 (Inspect wire harness and all connectors between the ECM and the secondary relay coil wiring. Replace secondary pump relay, if coil resistance is less than 2 ohms.) 
E284 (2s)  Low Brake Accumulator Pressure  Probable Cause: Brake accumulator pressure is low when the operator releases the parking brake or puts the transmission in gear.

Recommended Actions: Engage parking brake followed by elevating engine speed to increase brake accumulator pressure. If problem persists, check the brake system. 
E284 (3)  Low Brake Accumulator Pressure  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: Brake accumulator pressure is low as a result of low hydraulic pressure. A failure of the main hydraulic pump, a failure of a hose or cold oil at startup could be the cause for this problem.

Recommended Actions: Engage parking brake followed by elevating engine speed to increase brake accumulator pressure. If problem persists, check the brake system.

If the above action is not successful:
Check brake accumulators precharge and seals.
Check fan/brake valve and pump. 
E329 (2)  Transmission Filter Plugged  Probable Cause: (1) Transmission filter needs replacement (2) Wire failure on the filter bypass switch (3) Transmission filter bypass Switch failure.

Recommended Actions: Inspect the wiring and ensure that the filter bypass switch component is intact before replacing the Transmission filter. 
E330 (3)  Transmission Output Speed  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: (1) Transmission Output Speed # 1 AND #2 sensors are faulted. (2) Transmission Output Speed # 1 and #2 sensors works fine but do not match in the speed each senses.

Recommended Actions: Inspect the wiring and ensure that both sensors are intact before replacing the sensors. 
E490 (2s)  Parking Brake Applied with Machine Not in Neutral  Probable Cause: (1) parking brake applied with machine in gear (2) Machine in Gear and parking brake applied.

Recommended Actions: Shift to neutral and apply parking brake switch. Disengage parking brake when appropriate prior to shifting to gear. If the event persists, check the troubleshooting information for Shift Lever Sensor and parking brake System. 
E542 (2)  Low Steering Pump Pressure  Probable Cause: (1) worn or damaged pump, (2) a collapse of the hose, (3) a leak of the seals or hoses or a faulty pressure sensor.

Recommended Actions: A fault of the pressure sensor will result in an active diagnostic code. The other probable causes are mechanical in nature and will require physical examination. 
E542 (3)  Low Steering Pump Pressure  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: (1) worn or damaged pump, (2) a collapse of the hose, (3) a leak of the seals or hoses or a faulty pressure sensor.

Recommended Actions: Safely shut down the machine as soon as possible. The pressure has fallen to a level that could result in damage to the machine.
A fault of the pressure sensor will result in an active diagnostic code. The other probable causes are mechanical in nature and will require physical examination. 
E560 (3)  Secondary Steering Pump Pressure Not Responding To Command  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: Failure of the secondary steering relay or damage to the hydraulic flow circuit.

Recommended Actions: Check for a diagnostic code related to the failure of the secondary steering relay. Check the secondary steering hydraulic circuit for signs of leakage or damage. 
E62 (2s)  Parking Brake Applied with Machine in Motion  Probable Cause: (1) Machine is in motion with parking brake engaged. (2) parking brake engaged while the machine is moving.

Recommended Actions: Do not drive the vehicle through parking brake. (1) Stop the vehicle if the intent is to stop. (2) Disengage parking brake if the intent is to drive. If the event persists, check the troubleshooting information for Transmission Output Speed sensors and parking brake System. 
E667 (2)  Machine Overspeed  Probable Cause: Driving machine beyond the maximum runout speed.

Recommended Actions: Slow the machine by engine retarding/hydraulic braking. 
E706 (3)  Parking Brake Disabled Due To System Fault  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: (1) Cold/viscous oil delays the reactivation of the parking brake. (2.) The parking brake switch is ON and the ECM is detecting a hydraulic pressure greater than the pressure that allows parking brake engagement. When the hydraulic pressure in the circuit is below 500 kPa (73 psi), the ECM will assume that the park brake is engaged (ON). (3) parking brake solenoid is shorted to battery and parking brake pressure sensor is faulted simultaneously.

Recommended Actions: (1) Warm hydraulic oil, or replace with lower weighted oil if conditions are warranted. (2) Check parking brake hydraulic system. (3) Troubleshoot wiring and/or replace solenoid and/or sensors. 
E716 (1)  Conflicting Brake Pressure Information  Probable Cause: Mismatch of parking brake pressure sensor readings.

Recommended Actions: (1) Monitor parking brake pressure readings in Cat Electronic Technician and identify the reading that is unreactive to service brake pedal operation. Inspect the wiring of that sensor before replacing the component. (2) If (1) is inconclusive, inspect the sensors before replacing the components. 
E861 (1)  Clock Manual Alignment Required  Probable Cause: The ECM internal clock is too far out of alignment with the other control module clocks on the machine

Recommended Actions: Use Cat® ET to align the clock with the other control modules 
E1223 (2)  Front Brake Cooling Filter  Probable Cause: (1) Front brake cooling filter needs replacement (2) Wire failure on the filter bypass switch (3) Front brake cooling filter bypass Switch failure.

Recommended Actions: Inspect the wiring and ensure that the filter bypass switch component is intact before replacing the filter. 
E1225 (2)  Brake Charge Pump Filter  Probable Cause:(1) Brake charge pump filter needs replacement (2) Wire failure on the filter bypass switch (3) Brake charge pump filter bypass switch failure.

Recommended Actions: If event is active after filter is replaced, Inspect the wiring. Ensure that the filter bypass switch component is intact. 
E1248 (1)  Front Cross Axle Lock Speed Mismatch  Probable Cause: (1.) Wheel speed sensor failure. (2.) Wheel speed sensor tone ring failure. (3.) Lower "Powertrain" components failure.

Recommended Actions: (1.) Check for wheel speed sensor diagnostics. (2.) If no diagnostics are present, monitor the wheel speed sensor using Cat® ET. If speed sensor reads zero while machine is in motion, check sensor tone ring. 
E1304 (2)  Secondary Steering Pump Automatic Test Bypassed  Probable Cause: Upon the startup of the machine, a test of the secondary steering system is performed.

Recommended Actions: None. Operator will be informed of this action when warning lamp for secondary steering is illuminated on dash. 
E1327 (2)  High Engine Speed Shift  Probable Cause: Excessive throttle with quick shift out of neutral. Excessive throttle while performing directional shift.

Recommended Actions:Operate shift lever before applying throttle. 
E1337 (2s)  Access Ladder Lowered  Probable Cause: (1) Machine is keyed on with access ladder lowered. (2) Dirt/debris obstructing the ladder to raise completely. (3) Ladder raise switch position sensor reads incorrect state. (4) Park Brake is disengaged.

Recommended Actions: (1) Raise the ladder before moving the machine. (2) Clean the dirt/debris in the sliders, hinges, hand rails to ensure smooth ladder operation. (3) Replace the linear actuators. (4) Inspect the wiring and ensure that the component is not working before replacing the ladder raise switch. 
E1388 (2)  Operator Seat Belt Unfastened While Machine Is Not Idle  Probable Cause: (1) The Event Code E1434(2) "Operator Seat Belt Unfastened" is active AND machine ground speed is greater than 8 km/h (5 mph). (2) Event Code E1434(2) "Operator Seat Belt Unfastened" is active AND machine ground speed is between 1.6 km/h (1 mph) and 8 km/h (5 mph) for greater than 10 seconds.

Recommended Actions: Latch seat belt before continuing to operate the machine. 
E1434 (2)  Operator Seat Belt Unfastened  Probable Cause: (1) The seat belt is not latched AND the park brake switch is OFF. (2) The seat belt is not latched AND the actual gear is not NEUTRAL. (3) The seat belt switch is faulty AND the park brake switch is OFF. (4) The seat belt switch is faulty AND the actual gear is not NEUTRAL.

Recommended Actions: Latch seat belt before continuing to operate the machine. 
E1479 (2)  High Front Brake/Transmission Oil Temperature  Probable Cause: Underuse of engine braking.

Recommended Actions: Increase the engine braking level through keypad. 
E1479 (3)  High Front Brake/Transmission Oil Temperature  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: Underuse of engine braking.

Recommended Actions: Move the machine to a safe location and allow time for the brakes to cool. Avoid this problem by increasing the engine braking level through keypad. 
E2086 (2)  Hydraulic Fan Filter Plugged  Probable Cause: Filter is clogged.

Recommended Actions: Replace filter. 
E2174 (2)  Parking Brake Switch Off at Inappropriate Time  Probable Cause: Parking brake switch is off at startup with the parking brake engaged.

Recommended Actions: Ensure that parking brake switch is on before shutting down/starting up the machine. 
E2531 (1)  Engine Torque Limiting Clutch Slip Detected  Probable Cause: (All the following conditions must be met for the code to be active.)
• The Transmission Engine Speed is greater than 1000 rpm (the engine speed can be less than 1000 rpm).
• The speed sensors are not faulted.
• A shift in gear has not happened for more than 1.5 seconds.
• The slip speed (difference between the transmission measured engine speed and the engine speed (Transmission Engine Speed -- Engine Speed) is greater than 75 rpm.

Recommended Actions: If the difference between the Transmission Engine Speed and the Engine Speed is less than 50 rpm, the event is de-activated. The E2531 event code is reset when any of the following conditions are met: Confirm that any of the following conditions are met.
• The Transmission Engine Speed is less than 1000 rpm.
• The speed sensors are faulted.
• The shift into gear function is active. 

Implement ECM Event Code List

The following table lists the event codes that apply to the Implement control system. The recommended response is listed. Use Cat® ET to determine if the event codes are active or logged.

Table 3
Event Codes For Implement ECM (MID 82) 
EID (Level)  Description  Possible Cause or Recommended Response 
E861 (1)  Clock Manual Alignment Required  Probable Cause: The ECM internal clock is too far out of alignment with the other control module clocks on the machine

Recommended Actions: Use Cat® ET to align the clock with the other control modules 
E875 (1)  Low System Voltage  Probable Cause: Event code is active when the system voltage is less than 18 VDC for greater than 30 seconds.

Recommended Actions: Search Cat® ET for any diagnostic codes related to voltage and troubleshoot the problem. 
E875 (2)  Low System Voltage  Probable Cause: Event is active when the system voltage is less than 18 VDC for more than 60 seconds.

Recommended Actions: The machine returns to normal operation when the voltage exceeds 18 VDC for more than 2 seconds. 
E876 (1)  High System Voltage  Probable Cause: Event code is active when the system voltage is greater than 32 VDC for more than 30 seconds.

Recommended Actions: Search Cat® ET for any diagnostic codes related to voltage and troubleshoot the problem. 
E876 (3)  High System Voltage  Immediate Safe Shutdown Machine Of Machine Required.

Probable Cause: Event is active when the system voltage exceeds 32 VDC for more than 60 seconds.

Recommended Actions: Move the machine to a safe location and shut down the machine. Use Cat® ET to identify diagnostic codes related to high voltage. Use the appropriate troubleshooting procedure to correct the source of the excess voltage. 
E878 (2)  High Hydraulic Oil Temperature  Probable Cause: When hydraulic oil temperature is greater than 99° C (210° F) for more than 3 seconds. Deactivates when hydraulic oil temperature is less than 97° C (207° F) for greater than 1 second.

Recommended Actions: 1) Modify machine operation to reduce system load. 2) Check the hydraulic oil level. 3.) Check hydraulic cooling system. Clean the hydraulic oil cooler, if needed. 
E878 (3)  High Hydraulic Oil Temperature  Immediate Safe Shutdown Machine Of Machine Required.
Probable Cause: When hydraulic oil temperature is greater than 101° C (214° F) for more than 2.5 seconds. Deactivates when hydraulic oil temperature is less than 99° C (210° F) for greater than 1 second.

Recommended Actions: 1) Modify machine operation to reduce system load. 2) Check the hydraulic oil level. 3.) Check hydraulic cooling system. Clean the hydraulic oil cooler, if needed. 4.) Ensure that air is not in the oil and the viscosity of the oil is correct. 5.) Check for a restriction in oil flow due to a bent hose, a bent tube, or a restriction in an oil passage. 6.) Check hydraulic pump for excessive wear. 
E1177 (2)  Elevator Charge Pump Filter Plugged  Probable Cause: The filter is plugged and the pressure at the filter is greater than 172 kPa (25 psi) .

Recommended Actions: Replace the filter at the earliest convenient time. 
E1261 (2)  Cushion Hitch and Implement Pilot Supply Filter Plugged  Probable Cause: The filter is plugged and the pressure at the filter is greater than 172 kPa (25 psi) allowing the filter bypass circuit to open.

Recommended Actions: Replace the filter at the earliest convenient time. 

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