Event Codes
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621K OEM Wheel Tractor-Scraper
[UENR5941]
621K OEM Wheel Tractor-Scraper
Determining Diagnostic Trouble Codes
621K OEM Wheel Tractor-Scraper
Steering System
ELECTRICAL AND STARTING SYSTEM
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>®</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.
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| Illustration 1 | g03351701 |
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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.
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.
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.
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.
The Warning level 2S requires an immediate change in machine operation to avoid possible damage to the system of the machine.
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
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.
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| WARNING OPERATION | |||||
|---|---|---|---|---|---|
| Warning Level | Warning Indications | Required Action of Operator | Possible Result (1) | ||
| Warning Indicators | Action Indicator | Sounds Action Alarm | |||
| 1 | OFF(2) | OFF | OFF | No immediate action is required. The system needs attention soon. | No harmful effects or no damaging effects |
| 2 | 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 |
| 3 | ON | Flash ON and OFF | Pulse ON and OFF | Immediately perform a safe engine shutdown. | Injury to operator or severe damage to components |
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| (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.
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.
Perform the following steps to troubleshoot an event:
- 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.
- Verify that the event is not due to normal machine operation. Verify that the event is not due to an error by the operator.
- Check all fluid levels and all oil levels.
- 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.
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| 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 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 |
| 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. Recommended Actions: Immediately move machine to a safe location. Shut down machine. Allow oil to cool to less than |
| 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 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 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. |
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.
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| 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 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 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 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 Recommended Actions: Replace the filter at the earliest convenient time. |
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