VALVE GP-PRESSURE CONTROL 1720269 - Caterpillar

Self-Diagnostics
Caterpillar Electronic Engines have self diagnostic capability. When the system detects a problem, the CHECK ENGINE/DIAGNOSTIC (YELLOW) lamp activates. In most cases a diagnostic code will be stored in permanent memory within the ECM. The diagnostic code can be retrieved by using either of the following methods.* Caterpillar electronic service tool* CHECK ENGINE/DIAGNOSTIC lampSome vehicles have electronic dashboards that provide a direct readout of engine diagnostic codes. If equipped with an electronic dashboard display, follow the instructions that are provided by the vehicle manufacturer in order to retrieve the engine diagnostic codes.Check Engine/Diagnostic Lamp
The CHECK ENGINE/DIAGNOSTIC (YELLOW) lamp on the vehicle dashboard is used to communicate the status or the operation situations of the electronic engine and the control system.When the ignition key switch is turned ON, the YELLOW lamp will illuminate for five seconds (as a lamp check). The lamp will also illuminate and flash every five seconds whenever the ECM detects an ACTIVE fault or condition. If the lamp comes ON and continues to flash every five seconds after initial start-up, the ECM has detected a system problem.The YELLOW lamp is also used for the Idle Shutdown Timer. The lamp will start to flash at a rapid rate 90 seconds before the programmed idle time expires. The engine will shut down after the 90 second interval. To disable the Idle Shutdown Timer, the ALLOW IDLE SHUTDOWN OVERRIDE must be programmed to YES. The clutch pedal or the service brake pedal must be depressed during the final 90 seconds while the YELLOW lamp is flashing. A diagnostic EVENT code, Override of Idle Shutdown Timer, will be logged 1n the ECM.Diagnostic Flash Code Retrieval
Check Engine/Diagnostic Lamp in Cab
The following procedure can be used to determine ACTIVE codes (a constantly flashing lamp indicates an active code), or any codes which occur after the engine is started. The procedure cannot be used to retrieve LOGGED codes which occurred before the ignition key switch was turned ON (i.e. from yesterday or a week ago). A Caterpillar electronic service tool is necessary to retrieve those LOGGED codes.All ACTIVE codes may be viewed using a Caterpillar electronic service tool or by performing the following procedure.1. Turn the Cruise Control ON/OFF switch OFF.2. Move the SET/RESUME switch to either position. Hold that position until the YELLOW lamp begins to flash.The YELLOW lamp will flash to indicate a two digit flash code and the SET/RESUME switch may be released. The sequence of flashes represents the system diagnostic message. Count the first sequence of flashes in order to determine the first digit of the diagnostic code. After a two second pause, the second sequence of flashes will identify the second digit of the diagnostic code.Any additional diagnostic codes will follow (after a pause) and will be displayed in the same manner. Flash Code 55 signals No Detected Faults have occurred since the ignition key switch was turned ON.For further information, assistance for repairs, or troubleshooting, refer to the Service Manual or consult an authorized Caterpillar dealer.