Allison

Allison 3000 & 4000 Gen 4 Fault Code: P1891 Thr...

DIAGNOSTIC RESPONSE:Use default throttle values CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) can be calibrated to receive a Pulse Width Modulation (PWM) TPS pedal position signal. NOTE: A throttle source can...

Allison 3000 & 4000 Gen 4 Fault Code: P1739 Inc...

DIAGNOSTIC RESPONSE:Command 2nd and allow shifts 2 through 6, N, R CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses input from the turbine speed and output speed sensors to determine the...

Allison 3000 & 4000 Gen 4 Fault Code: P0990 Ret...

DIAGNOSTIC RESPONSE:None CIRCUIT DESCRIPTION:Some transmission retarder applications may use an optional retarder pressure sensor (also called Electronic Braking System (EBS) pressure sensor, and/or retarder pressure transducer). The retarder pressure sensor...

Allison 3000 & 4000 Gen 4 Fault Code: P0989 Ret...

DIAGNOSTIC RESPONSE:None CIRCUIT DESCRIPTION:Some transmission retarder applications may use an optional retarder pressure sensor (also called EBS pressure sensor, and/or retarder pressure transducer). The retarder pressure sensor provides an analog...

Allison 3000 & 4000 Gen 4 Fault Code: P0977 Shi...

DIAGNOSTIC RESPONSE:7-speed: Allow 2 through 6, N, R CIRCUIT DESCRIPTION:The Shift Solenoid 2 (SS2) may either be assigned to retarder models with an air solenoid or to the SS2 required...

Allison 3000 & 4000 Gen 4 Fault Code: P0976 Shi...

DIAGNOSTIC RESPONSE:7-speed: Allow 2 through 6, N, R. inhibit TCC operation. CIRCUIT DESCRIPTION:The Shift Solenoid 2 (SS2) may either be assigned to retarder models with an air solenoid or to...