30 SEBU7901-01 Operation Section Engine Diagnostics Engine Diagnostics i01463253 Diagnostic Lamp i01563934 Self-Diagnostics SMCS Code: 1000; 1900; 1901; 1902; 7451 The “DIAGNOSTIC” lamp is used to indicate the existence of an active fault by flashing codes. SMCS Code: 1000; 1900; 1901; 1902 Caterpillar Electronic Engines have the capability to perform a self-diagnostics test. When the system detects an active problem, the “DIAGNOSTIC” lamp is activated. Diagnostic codes will be stored in permanent memory in the Electronic Control Module (ECM). The diagnostic codes can be retrieved by using the following components:
When the ignition switch is first turned on, the “DIAGNOSTIC” lamp will go through the following procedure: The “DIAGNOSTIC” lamp will come on and the “DIAGNOSTIC” lamp will remain on for five seconds. This checks the operation of the lamp. Caterpillar electronic service tools The “DIAGNOSTIC” lamp will turn off. “DIAGNOSTIC” lamp The “DIAGNOSTIC” lamp will come on again and the “DIAGNOSTIC” lamp will flash codes for any active diagnostic codes. Not all diagnostic codes have a unique flash code. Note: The “DIAGNOSTIC” lamp must be installed by the OEM or by the customer. Some installations have electronic displays that provide direct readouts of the engine diagnostic codes.
Refer to the manual that is provided by the OEM for more information on retrieving engine diagnostic codes. The “DIAGNOSTIC” lamp will turn off for five seconds. The “DIAGNOSTIC” lamp repeats all active diagnostic codes. Active codes represent problems that currently exist. These problems should be investigated first. If a code is active, the “DIAGNOSTIC” lamp will flash the flash code at five second intervals. A fault diagnostic code will remain active until the problem is repaired. The electronic control module will continue flashing the flash code at five second intervals until the problem is repaired. Logged codes represent the following items:
i02496338 Diagnostic Flash Code Retrieval Intermittent problems Recorded events Performance history SMCS Code: 1000; 1900; 1901; 1902 The problems may have been repaired since the logging of the code. These codes do not indicate that a repair is needed. The codes are guides or signals when a situation exists. Codes may be helpful to troubleshoot problems. Problems with the electronic control system are reported via these types of codes: flash codes, SPN/FMI codes, diagnostic codes, and event codes. When the problems have been corrected, the corresponding logged fault codes should be cleared.