416C, 426C, 428C, 436C and 438C Backhoe Loaders Transmission Electronic Control System Caterpillar

Using the Diagnostic Indicator to Determine Diagnostic Codes

Usage:

426C 1ER

Use the following tools in order to determine the diagnostic codes: Diagnostic Indicator, the ET and the ECAP. Determine the diagnostic codes. Perform the procedure that corresponds to the diagnostic code (CID and FMI).

Show/hide table

Table 1
The Quick Reference Table for the Operation of the Diagnostic Indicator
Operation	Contact 1 ⁽¹⁾	Contact 3 ⁽¹⁾	Contact 5 ⁽¹⁾
Scroll through the active faults.	Ground ⁽²⁾	Open	Open
Scroll through the inactive faults.	Open	Open	Ground ⁽²⁾
Clear ⁽³⁾ the Faults	Open	Ground	Open

Show/hide table

^( 1 )	The contact is located in the connector for the harness code. Remove the harness code plug.
^( 2 )	Remove the ground in order to stop scrolling. The diagnostic code will be placed on hold.
^( 3 )	An active fault can not be cleared. The fault must be on hold in order to clear the fault.

Use the following procedure when a fault is detected:

When a fault is detected, the diagnostic indicator is illuminated. Determine the diagnostic code. Use table 2 in order to find the correct CID and the FMI. The diagnostic code is flashed on the control module's diagnostic indicator.

Troubleshoot the diagnostic codes with the following procedures:

To enter service mode, disconnect the machine identification plug from the harness code connector. When the control module is in the service mode the control module's diagnostics are available in order to assist with troubleshooting.

A single fault is shown. The fault is on hold. Information is shown on the diagnostic indicator by flashing the indicator ON and OFF. The flashes represent a two digit number. A series of flashes represent the first digit. A one second pause follows the first digit. Another series of flashes represents the second digit. Count the number of flashes. The number of flashes determine each digit. A three second pause separates each two digit number. Use table 2 in order to find the correct CID and the FMI. The diagnostic code is flashed on the control module's diagnostic indicator.

When you scroll through the diagnostic codes, the codes for all of the active faults are shown one at a time. Ground connector contact 1 in order to scroll through the active faults. Remove the ground from connector contact 1 in order to stop scrolling. The diagnostic code that is shown is now on hold. A diagnostic code of 11 indicates that there are no active faults.

When you scroll through the diagnostic codes, the codes for all of the inactive faults are shown one at a time. Ground connector contact 5 in order to scroll through the inactive faults. Remove the ground from connector contact 5 in order to stop scrolling. The diagnostic code that is shown is now on hold. A diagnostic code of 12 indicates that there are no inactive faults.

Perform the procedure that corresponds to the diagnostic codes (CID and FMI).

Clearing a fault removes the fault from the control module's memory. When a fault is corrected, it is necessary to remove the fault from the memory of the control module. The diagnostic code must be on hold in order to clear an inactive fault. The control module does not allow active faults to be cleared.

Place the diagnostic code on hold.

The diagnostic code is on hold. Ground connector contact 3 in order to remove the inactive fault from the control module's memory. The diagnostic indicator is extinguished after the inactive fault has been cleared. The diagnostic indicator is extinguished until you scroll through the diagnostic codes. The control module does not allow active faults to be cleared.

Repeat the procedure for any remaining faults. Return to normal mode when you are finished by replacing the machine identification plug. A diagnostic code of 12 indicates that there are no inactive faults. A diagnostic code of 11 indicates that there are no active faults.

Show/hide table

Table 2
Conversion Table for the Diagnostic Codes
Code	CID - FMI	Description
11
12
13		416C
14		426C
15		428C
16		436C
17		438C
18		BHL
31	641 - 05	The forward high solenoid circuit is open.
32	642 - 05	The circuit for reverse is open.
33	643 - 05	The forward low solenoid circuit is open.
34	644 - 05	The first and second gear solenoid circuit is open.
35	645 - 05	The circuit for the third gear is open.
36	646 - 05	The circuit for the fourth gear is open.
38	683 - 05	The circuit for the parking brake alarm is open.
41	641 - 06	The forward high solenoid has a short to ground.
42	642 - 06	The reverse solenoid has a short to ground.
43	643 - 06	The forward low solenoid has a short to ground.
44	644 - 06	The first and second gear solenoid has a short to ground.
45	645 - 06	The solenoid for third gear has a short to ground.
46	646 - 06	The solenoid for fourth gear has a short to ground.
48	683 - 06	The parking brake alarm has a short to ground.
51	641 - 03	The forward high solenoid has a short to the battery.
52	642 - 03	The reverse solenoid has a short to the battery.
53	643 - 03	The forward low solenoid has a short to the battery.
54	644 - 03	The first and second gear solenoid has a short to the battery.
55	645 - 03	The solenoid for third gear has a short to the battery.
56	646 - 03	The solenoid for fourth gear has a short to the battery.
58	683 - 03	The parking brake alarm has a short to the battery.
62	191 - 02	Transmission speed sensor's input is invalid.
63	668 - 02	The shift lever's input is invalid.
64	168 - 00	The battery voltage is above normal.
65	168 - 01	The battery voltage is below normal.
66	650 - 02	The harness code's input is invalid.
73	520 - 02	The transmission's configuration is incorrect.