Allison
Allison 3000 & 4000 Gen 4 Fault Code: U0100 Lost Communication With ECM/PCM (SAE J1708/J1587)
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:Use default values. CIRCUIT DESCRIPTION:SAE J1708 defines the hardware and general structure of this interface, while SAE J1587 defines the format of data and messages used. This two-wire twisted pair datalink offers low speed communication (9600 baud) intended for basic information sharing and diagnostics, such as: 1. Engine information received by the Transmission Control Module (TCM) for shift modulation and clutch control, and2. Transmission information sent to driver displays or instrument clusters. Due to its slow baud rate, SAE J1587 is not intended for vehicle control purposes. A41 and A51 model TCMs do not have SAE J1708/J1587 support. The...
Allison 3000 & 4000 Gen 4 Fault Code: U0103 Lost Communication With Gear Shift Module 1 (Shift Selector)
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:Maintain range selected, observe gear shift direction circuit CIRCUIT DESCRIPTION:The OEM 4th Generation Controls shift selectors communicate with the Transmission Control Module (TCM) by exchanging standardized digital messages over the SAE J1939 Controller Area Network (CAN). The physical network consists of a two-wire twisted-pair harness and, typically a third shield wire. A single 120 Ω termination resistor is located at each end of the network and produces 60 Ω resistance for the circuit. Vehicle OEMs may choose to install external termination resistors or use internal termination resistors built into many SAE J1939 electronic modules, including the TCM and shift...
Allison 3000 & 4000 Gen 4 Fault Code: U0115 Lost Communication With ECM/PCM (CAN 1)
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:Use default values CIRCUIT DESCRIPTION:In OEM 4th Generation Controls, the preferred digital datalink is the SAE J1939 Controller Area Network (CAN). The Transmission Control Module (TCM) communicates with the engine control module and other controllers by exchanging standardized digital messages over SAE J1939. The physical network consists of a two-wire twisted pair, two 120 Ω termination resistors and, in most cases, a third shield wire. A 120 Ω termination resistor is located at each end of the network. Vehicle OEMs may choose to install external termination resistors or use internal termination resistors built into many SAE J1939 electronic modules,...
Allison 3000 & 4000 Gen 4 Fault Code: U0291 Lost Communication With Gear Shift Module 2 (Shift Selector)
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:Maintain range selected, observe gear shift direction circuit CIRCUIT DESCRIPTION:The OEM 4th Generation Controls shift selectors communicate with the Transmission Control Module (TCM) by exchanging standardized digital messages over the SAE J1939 Controller Area Network (CAN). The physical network consists of a two-wire twisted-pair harness and, typically, a third shield wire. A single 120 Ω termination resistor is located at each end of the network and produces 60 Ω resistance for the circuit. Vehicle OEMs may choose to install external termination resistors or use internal termination resistors built into many SAE J1939 electronic modules, including the TCM and shift...
Allison 3000 & 4000 Gen 4 Fault Code: U0304 Incompatible Gear Shift Module 1 (Shift Selector) ID
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:Ignore shift selector inputs CIRCUIT DESCRIPTION:The OEM 4th Generation Control shift selectors communicate with the Transmission Control Module (TCM) by exchanging standardized digital messages over the SAE J1939 Controller Area Network (CAN). The physical network consists of two-wire twisted-pair harness and, typically, a third shield wire. A single 120 Ω termination resistor is located at each end of the network and produces 60 Ω resistance for the circuit. Vehicle OEMs may choose to install external termination resistors or use internal termination resistors built into many SAE J1939 electronic modules, including the TCM and shift selector. This DTC test verifies...