420F2, 420F2 IT, 420F2 ST, 428F2, 430F2 IT, 430F2 ST, 432F2, 434F2 and 444F2 Backhoe Loaders Caterpillar


Anti-Theft Keypad - Test

Usage:

420F2 LBS


The Security Keypad immobilizes the Engine, Transmission, and Hydraulic systems of the backhoe loader at power ON until a valid passcode is entered. Machine operation is enabled when the correct passcode is entered.

The Keypad can be set to operate as a Standalone unit on machines not equipped with a Machine ECM. The Keypad can be "integrated" to communicate with a Machine ECM on machines that are configured appropriately. To communicate fully with the Security Keypad, Cat® Electronic Technician (Cat ET) version ET2015-A must be used.

Two LED lights are located on the keypad. The LED lights provide the operator with a visual status indicator concerning the operation of the security system. The keypad also emits a "beep" or series of "beeps" to increase the awareness of the operator when necessary. When a warning condition is detected, the audio output sounds a long "beep" (or tone) and both LED indicators flash RED. The Keypad ECU also communicates with the Machine ECM to allow diagnostic codes to be displayed using the Cat ET service tool.




Illustration 1g03737493

The Antitheft Security Keypad communicates via the CAN Data link to Machine ECM when a monitored condition is observed. The operator or technician are alerted to abnormal conditions by the LED lights on the switch panel. The LED lights will flash in a specific sequence, or the color of the LED lights change. In specific instances, and are sometimes combined with an audible signal.

The technician must determine the "Security System Configuration Code" from the status screen in Cat ET for the Keypad ECU before beginning troubleshooting. The code is used to determine if the Security Keypad is configured as "Standalone" or "Integrated". The Configuration Identity Code identifies the type of machines that the Keypad can interface with, see Table 1.

The illustrations can be used as a reference to navigate within Cat ET and identify the configuration code for the machine being serviced.




Illustration 2g03780029

Click the "Select ECM" icon (circled), select "Security System" from the screen choices.




Illustration 3g03780030

Click the "Diagnostic" icon (circled) to display the Keypad Status screen.


Tables 1, 2, and 3 are included for reference when interpreting the status screen information.

Table 1
Security System Configuration Code     Machine Configuration Description    
1     Backhoe Loader Standalone Keypad with LRC engine    
2     Backhoe Loader Integrated ECM and Keypad with C4.4 HRC engine.    
3     Backhoe Loader Standalone Keypad with HRC engine (C3.4 or C4.4)    
4     Backhoe Loader Integrated ECM and Keypad with LRC engine.    
5     Backhoe Integrated ECM and Keypad with C3.8 HRC or LRC engine    
6     Compact Wheel Loader Integrated ECM and Keypad with C3.8 HRC or LRC engine.    

Table 2
Security System Status     Status Description    
Armed     Keypad LOCKED with outputs set to immobilize state.    
Disarmed     Keypad UNLOCKED with outputs set to run state.    
System Operation Denied     Keypad is in Tamper Locked out state for 15 minutes.    

Table 3
Security System Authentication Setup Status     Status Description    
Programming Pending     Keypad is in configuration programming mode and must be set to suit machine type using Cat ET configuration procedure.    
Transport Complete     Keypad in Transport mode, auto unlock or code entry.    

For "Standalone" machine configurations the keypad immobilizes the LRC engine using two antitheft relays. One relay immobilizes the starter coil and the other relay interrupts fuel flow. The keypad is also used to control the transmission neutralize signal.

For "Integrated" configurations the keypad communicates via the CAN Data Link to the Machine ECM. The Machine ECM immobilizes the engine and other systems required to start the machine. The keypad also controls the starter coil via "Antitheft Relay 1".

See Table 4 for troubleshooting information related to the Antitheft Relays.

Table 4
Problem     Suggested Troubleshooting    
"Antitheft Relay 1" Failed (Engine will not crank)     When the engine starter will not crank and the Keypad has unlocked correctly, check the operation of "Antitheft Relay 1". The relay is located under the cab, connected to the starter coil. Review the troubleshooting information located in the Troubleshooting, "Relay - Test" section of this manual.    
"Antitheft Relay 2" Failed (Engine fuel shutoff)     If the engine does crank but does not keep running and the Keypad has unlocked correctly, check the operation of "Antitheft Relay 2". The relay is located under the cab and wired to the LRC engine fuel solenoid. Review the troubleshooting information located in the Troubleshooting, "Relay - Test" section of this manual.    

The following table explains the meaning of the various types of LED display patterns that are programmed into the security system.

Table 5
Keypad LED Indication     Keypad Operation or Mode     Description    
LED2 (solid AMBER) at KEY ON     Factory Program Mode, Keypad awaiting Configuration     Power ON ( indicated by beep), keypad "beeps" when pressed.    
LED2 (flashing AMBER or solid AMBER) depending on key switch     Factory Auto unlock mode, Transport Mode     LED1 flashes GREEN at KEY ON, solid GREEN when system unlocks.    
LED1 and LED2 flash once, along with a short "beep"     Initialize reset at Battery ON     Battery power ON, one "beep" indicates successful reset, two "beeps" indicates a warning.    
LED2 (solid RED)     System locked, key in OFF position     LED2 is OFF in low-power mode then RED when a key is pressed.    
LED2 (flashing RED)     System locked with key in ON position, awaiting passcode entry     Keypad ready for entry of passcode.    
LED1 (solid GREEN)     System unlocked, key in ON position     System unlocked.    
LED1 (flashing GREEN)     Lockout pending, key in OFF position, "Grace" period timeout active     LED1 (flashing GREEN) "Grace" timer countdown for 30 seconds or 15 minutes.    
LED2 (fast flash, alternating between RED and AMBER and long "beep")     Tamper Lockout or ECM Block Mode     Code entered incorrectly five times. After 15 minutes, switch to Key ON position, enter code correctly    
LED2 (AMBER when key is pressed)     Owner/Dealer Login to Unlock system     Press and hold to enter passcode administration mode    
LED1 and LED2 (flash RED, coded series)     Diagnostics mode     Refer to Code Table 6 to interpret    

Table 6
Flash Code     Diagnostic Trouble Code (DTC)     Details of Issue    
1 Flash     639-9     CAN network signal not present.    
2 Flashes     639-3 or 639-4     Voltage of CAN bus network out of range.    
3 Flashes     2858-2     Configuration mismatch between Keypad ECU and Machine ECM. Keypad ECU does not detect Machine ECM.    
4 Flashes     1746-13     Machine ECM detected but not responding. MSS Security system (EAD) not installed.    
5 Flashes     639-2     CAN bus has stopped communicating for a period greater than 5 seconds.    
6 Flashes     1563-2     CAN address conflict - another controller is using the Keypad ECU identification.    
7 Flashes     1746-12     Keypad internal memory error.    

Note: Under normal conditions, when the battery disconnect is switched ON, LED1 and LED2 flash once and a short beep is heard. If a lower than expected system voltage is detected, two beeps will be heard at the time power is switched ON.

Table 7
Keypad ECU (MID 1024)    
DTC     Code Description     System Response    
152-4     Number of ECU Resets : Voltage Below Normal     Advisory number of module resets due to a short voltage drop surge at Battery disconnect switch ON, if Battery voltage is low or high current draw during engine cranking.    
168-3     Electrical System Voltage : Voltage Above Normal     The keypad will not accept the code to engage machine systems.

The system voltage for the Keypad ECU is greater than 18 VDC for longer than 30 seconds.

NOTE: To troubleshoot this issue, refer to the Troubleshooting, "Electrical Power Supply - Test" section of this manual.    
168-4     Electrical System Voltage : Voltage Below Normal     The keypad will not accept the code to engage machine systems.

The system voltage for the Keypad ECU is less than 7 VDC for longer than 30 seconds.

NOTE: To troubleshoot this issue, refer to the Troubleshooting, "Electrical Power Supply - Test" section of this manual.    
639-2     J1939 Network #1 : Data Erratic, Intermittent, or Incorrect
(5 Flash diagnostic code)    
Multiple failure codes or failure indicators may be active in relation to this fault.

Communication on the data link is interrupted for more than 5 seconds for this fault to be activated.    
639-3     J1939 Network #1 : Voltage Above Normal.
(2 Flash diagnostic code)    
CAN-High or CAN-Low signal voltage at module abnormal. This fault results from a problem with the circuit wiring or the terminating resistors. The technician should confirm that other devices have not been added to the CAN network.    
639-4     J1939 Network #1 : Voltage Below Normal.
(2 Flash diagnostic code)    
CAN-High or CAN-Low signal voltage at module abnormal This fault results from a problem with the circuit wiring or the terminating resistors. The technician should confirm that other devices have not been added to the CAN network.    
639-9     J1939 Network #1 : Abnormal Update Rate
(1 Flash diagnostic code)    
The CAN network data signal is not sensed for longer than 2 seconds when the Keyswitch ON position is engaged. This fault results when CAN network wiring is not connected, an open exists in the circuit, or the wiring is shorted to ground.    
1562-2     Programming Error, Device did not Accept Program Line : Data Erratic, Intermittent, or Incorrect     The Machine ECM does not accept the Keypad login or Program Command.

The Master login code has been deleted from the Machine ECM security management screen list. Enter code 2222 to reinstate.    
1563-2     Incompatible Monitor/Controller : Data Erratic, Intermittent, or Incorrect
(6 Flash diagnostic code)    
The Keypad ECM in conflict with another electronic controller. Another device on the CAN network has been detected that is using the Keypad CAN identification. The device that mimics the Security Keypad must be removed.    
1746-0     Security Device : Data Valid But Above Normal Operating Range
Tamper Lockout in Transport Mode LED2 - "Tamper" status flashing alternate Red and Amber    
Keypad held in Tamper Lockout condition after more than 255 transport code attempts have been made. To correct the problem, wait 15 minutes with Keyswitch in the ON position (LED2 slowly flashes RED). One further attempt is allowed. Keypad must now be setup for customer passcodes. See Dealer setup procedure REHS9968    
1746-2     Security Device : Data Erratic, Intermittent, or Incorrect     Keypad held in Tamper Lockout condition after five incorrect attempts to enter the code. To correct, wait 15 minutes with Keyswitch in the ON position (LED2 slowly flashes RED), then enter a correct code.    
1746-7     Security Device : Mechanical System Not Responding Properly     One or more of the buttons on the Keypad is stuck in the ON position. Attempt to release the button that is stuck or, if unsuccessful, replace the Keypad.    
1746-12     Security Device : Bad Device or Component
(7 Flash diagnostic code)    
The internal memory of the Keypad has failed, the operator is unable to enter a code. The Security Keypad must be replaced to correct this condition    
1746-13     Security Device : Out Of Calibration
(4 Flash diagnostic code)    
The Machine ECM has not responded to the Keypad CAN status message requests. This condition could be the result of two possible causes:
Cause #1 - The machine ECM, MSS-EAD configuration is not installed. Check External Authentication Device status in Cat ET. Confirm that status is set to INSTALLED under Machine Control ECM > System Configuration > Security Access Parameters.
Cause #2 - Another control device on the CAN network has taken temporary priority over the Keypad ECM. To correct Press button #9 to reset Keypad and re-send CAN message requests.    
1746-19     Security Device : Data Error     The Machine ECM rejects LOCK commands, UNLOCK commands, or passcode requests from the Keypad ECM. This condition could be the result of two possible causes:
Cause #1 - A Keypad passcode is not synchronized with the Machine ECM security management list. Reinstall passcode in the Machine ECM. See section
Cause #2 - After the machine is switched to KEY OFF the Machine ECM has not LOCKED. Check that the key switch signal to the Keypad and Machine ECM is active.    
1746-31     Security Device : A condition exists. LED2 in
"Tamper" status flashing alternate Red and Amber    
The machine ECM is reporting a Blocked or Locked-out state. The Keypad code entry is rejected by the machine ECM. This condition could be the result of two possible causes:

Cause #1 - The Machine ECM detects that the Keypad has been swapped. Turn the machine key switch to the ON position. Wait 15 minutes before attempting to enter a code into the Security Keypad.

Cause #2 - The Machine ECM is in BLOCKED state after the code has been entered incorrectly five times. Wait 15 minutes before attempting to enter a code into the Security Keypad.    
2858-2     Machine Data Configuration 1 : Data Erratic, Intermittent, or Incorrect
(3 Flash diagnostic code)    
The Keypad machine configuration is invalid because an incorrect Machine ECM is detected (the Machine ECM does not match the keypad configuration ID setting.)

Cause #1 - The Keypad ECM configuration code is set to "Integrated ECM" mode either ID2, ID4, ID5, or ID6 AND the Keypad does not sense the expected Machine ECM on the CAN network. Refer to Testing and Adjusting, "Configuration setting ", in this manual. Cause #2- The Keypad ECM configuration code is set to "Standalone" mode either ID1 or ID3 AND a Machine ECM has been detected. Refer to Testing and Adjusting, "Configuration setting ", in this manual.
Cause #2 - The Keypad ECM configuration code is set to "Standalone" mode either ID1 or ID3 AND a Machine ECM has been detected. Refer to.
Testing and Adjusting, ", "Anti-Theft System Configuration" in this manual.    



Illustration 4g03780393

The Antitheft Security Keypad communicates via the CAN Data Link to the Machine ECM. When a fault has occurred or an incorrect series of codes are detected, the Machine ECM communicates with the Engine ECM. This action is taken to secure the machine.

Table 8
Dealer / Owner Operation Troubleshooting    
Problem     Suggested Troubleshooting    
Low Machine Power - Battery Disconnect Switched ON     Indication: Both Keypad LED's flash once, two "beeps" are heard.

Defined Problem: Machine system voltage is less than 7 VDC.

Recommendation: Check the voltage at the Battery (12 VDC). Check the wiring resistance at the Keypad connector (repair or replace, if the resistance is high).    
Auto-Unlock Failure In Transport Mode     Indication: LED2 flashes AMBER when attempting to unlock machine while in Transport mode.

Defined Problem: For "Integrated ECM" configured machines, the Machine ECM has two default master codes loaded in memory. If the Machine ECM has been replaced, the Transport code may have been deleted from the ECM passcode list.

Recommendation: Use Cat ET and factory password to enter ECM code 1111. If attempting to unlock the machine while in transport mode, code 1111 must be entered to unlock the machine.    
Transport Code Entry Rejected     Indication: After the 1111 code is entered, LED2 continues to flash and a long beep is heard. The Keypad does not unlock the machine.

Defined Problem:
A.) The Transport code has been replaced in the Machine ECM passcode list.
B.) A Keypad, while in Transport mode, has been connected to a machine configured for another Keypad in Owner mode. This Keypad is rejected as a result of swap-out detection.

Recommendation: Use Cat ET to check the security management list and the factory password to replace the 1111 master code.    
Transport Mode Tamper Lockout     Indication: LED2 is alternating RED to AMBER quickly.

Defined Problem: An attempt has been made to enable Transport mode and the number of allowable attempts has been exceeded.

Recommendation: Wait 15 minutes or until LED2 is flashing slowly. Enter the Transport code or use the Dealer master passcode login process to reset the Transport code register.    
User Passcode Entry Rejected     Indication: LED2 continues solid RED, not unlocked.

Defined Problem: The entered passcode is not included in the valid list of passcodes. For Integrated machines, the passcode is not included in the Machine ECM security passcode list.

Recommendation: Use the Owner or Dealer passcode to unlock the Keypad. Add the missing Keypad User code into the Machine ECM security passcode list.    
Unable To Program A "User" Add or Delete a Passcode     Indication: A "beep" is heard when this action is attempted. DTC code 1562-2 is displayed in Cat ET.

Defined Problem: The Keypad cannot login to the Machine ECM because the master login has been deleted from the ECM passcode list.

Recommendation: Add code 2222 as a master code into the Machine ECM security management list using Cat ET and the Factory password system.    
Tamper Lockout     Indication: LED2 flashing RED to AMBER. A long "beep" is also heard.

Defined Problem: An incorrect code was entered more than 5 times.

Recommendation: Wait 15 minutes with the key switch in the ON position or until LED2 flashes RED slowly. Enter a correct code..    
Program Pending Mode     Indication: LED2 is solid AMBER at KEY ON

Defined Problem: The auto-unlock is not available because the Keypad is in "Programming Pending" mode.

Recommendation: Configuration set up must be carried out using Cat ET.    
No Transition From "Program" to "Transport" Mode     Indication: The LED indicators are not changing per the descriptions in Table 5.

Defined Problem: The Keypad does not indicate a transition from "Program" to "Transport" Mode.

Recommendation: After the configuration setup is complete, cycle the key switch to ON to reset the Keypad.    
No Re-Lock at KEY OFF (following timeout grace period)     Indication: LED1 flashes GREEN for 30 seconds but does not re-lock.

Defined Problem: Key switch signal fault.

Recommendation: If the machine uses an Integrated ECM, check in Cat ET that a key switch signal is present at BOTH the Keypad and the Machine ECM.    

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