- Diagnostic lamp
- Caterpillar electronic service tools
Only active diagnostic codes are displayed by the diagnostic lamp. Electronic service tools can be used for displaying both active codes and logged codes.
The diagnostic lamp is recommended only for determining the nature of a diagnostic code. The diagnostic lamp is not intended for detailed troubleshooting. Troubleshooting is performed with an electronic service tool.
Use the following procedure to obtain active diagnostic codes with a diagnostic lamp:
- Turn the engine control switch to the ON position.
The diagnostic lamp will illuminate for approximately five seconds. This is a self-test for the circuit. The diagnostic lamp will then produce a series of flashes.
- Count the number of flashes.
The first series of flashes represents the first digit of a diagnostic flash code. After a two second pause, a second series of flashes will occur. The second series of flashes represents the second digit of the flash code.
- Record the two-digit number.
Any additional active diagnostic codes will be displayed in the same manner. The diagnostic lamp will continue to flash while any diagnostic codes are active.
- Table 1 is a list of diagnostic flash codes and the corresponding descriptions.
Note: It is not necessary for the engine to be running in order to obtain diagnostic codes.
| Diagnostic Flash Codes For 3512 Industrial Engines | |
| Flash Code | Description |
| 21 | Sensor supply voltage |
| 22 | Rack position sensor |
| 24 | Engine oil pressure sensor |
| 25 | Boost pressure sensor |
| 26 | Turbocharger inlet pressure sensor |
| 27 | Coolant temperature sensor |
| 28 | Throttle position sensor calibration |
| 32 | Throttle position sensor |
| 33 | Engine rpm signal out of range |
| 34 | Loss of engine rpm signal |
| 35 | Engine overspeed (alarm) |
| 46 | Low engine oil pressure (alarm) |
| 51 | Intermittent battery power to the electronic control module |
| 52 | Personality module |
| 53 | Electronic control module |
| 55 | No active faults |
| 56 | System parameters or customer specified parameters |
| 61 | High coolant temperature (alarm) |
| 62 | Low coolant level (alarm) |
For detailed information on diagnostic codes, see the Service Manual, "Troubleshooting" module.
Caterpillar electronic service tools are designed to help service technicians perform the following service procedures:
- Obtaining data
- Analyzing data
- Diagnosing problems
- Performing calibrations
- Reading programmable parameters and changing the parameters
- Showing diagnostic codes
- Clearing diagnostic codes from memory
- Programming the electronic control module
Two different electronic service tools are available:
- Electronic Technician (ET)
- Electronic Control Analyzer Programmer (ECAP)
For information on using the electronic service tools, see the Service Manual, "Troubleshooting" module.