VALVE GP-MODULATING 1665880 - Caterpillar

Programmable Low Idle Rpm
The Programmable Low Idle rpm feature allows the engine's low idle rpm setting to be set anywhere between 600 and 750 rpm. This can be very helpful if a different rpm is needed to suit unique conditions or there is a resonance vibration problem at a specific rpm.
Idle Shutdown Timer
This feature has been developed to eliminate unnecessary idle time, but still allows overnight idling to heat or cool sleeper cabs. The Idle Shutdown Timer will stop the engine after a programmed amount of time if the following conditions are met.1. The parking brake is applied.2. Vehicle ground speed is zero.3. PEEC is in the warm mode.4. Operator does not override the shutdown timer.
Idle Shutdown Time is a Customer Specified Parameter programmable from three to 60 minutes (in one minute increments). This can be programmed with either of the two electronic service tools (ECAP or DDT) that are equipped with the new Service Program Modules. Without the new SPM, the Idle Shutdown Time cannot be programmed and the resulting Fault Code 56 cannot be cleared. If the Idle Shutdown Time is programmed to zero, the feature is disabled. The feature gives the operator the ability to override the function if the operator waits the programmed amount of time. In situations where it is necessary to keep the engine idling, the clutch pedal or brake pedal must go through a change in position (either by pressing or releasing the pedal) during the final 90 seconds prior to shutdown. During the final 90 seconds prior to shutdown, the Check Engine Lamp on the dash will flash at a rate of twice a second to warn the operator of the impending shutdown. If there is a change in throttle position during the final 90 seconds prior to shutdown, the timer will be reset, but not be disabled.
Vehicle battery power is not turned off after an Idle Timer Shutdown. The ECM and other vehicle electrical loads will result in battery drain after engine shutdown.To equip a PEEC truck with the Idle Shutdown Timer feature, a personality module change, an additional parking brake switch, and the associated wiring supplied by the vehicle's OEM are necessary. This wiring is outlined in the "Correct Wiring of Parking Brake Switch" section of this article.
Intermittent Fault Logging
To aid in troubleshooting intermittent PEEC faults, a new personality module allows diagnostic fault codes to be stored in temporary memory. This feature will retain all diagnostic messages as long as the ignition key remains ON. If the key is turned OFF, the stored diagnostic messages will be erased, and only active faults will be retained. Driver awareness of this "key ON" feature is essential to prevent service calls for the same intermittent faults. An updated ECAP or DDT (with Service Program Modules listed above) is required to display logged fault codes, a description of the fault, the number of occurrences, and the present status (active/not active) of the fault code.
Many intermittent faults are electrical connection problems. When troubleshooting