Allison

Allison 1000 & 2000 Gen 5 Fault Code:P0657 Actu...

CIRCUIT DESCRIPTION:High Side Driver 1 (HSD1) supplies battery voltage to the Main Modulation, Torque Converter Clutch (TCC) and Pressure Control Solenoid 1 (PCS1) solenoids via wire 111. HSD1 is continuously...

Allison 1000 & 2000 Gen 5 Fault Code:P0561 Syst...

CIRCUIT DESCRIPTION:The TCM requires a switched ignition voltage input. This switched ignition voltage signal originates from the ignition switch or an ignition relay to supply voltage to wire 163 in...

Allison 1000 & 2000 Gen 4 Fault Codes: P0717 Tu...

Allison 1000 & 2000 Gen 4 Fault Codes: P0717 Turbine Speed Sensor Circuit No Signal CIRCUIT DESCRIPTION:The speed sensors are variable reluctance devices which convert mechanical motion to an AC...

Allison 1000 & 2000 Gen 5 Fault Code:P0977 Shif...

CIRCUIT DESCRIPTION:Shift Solenoid 2 (SS2) is a Normally Closed (N/C) solenoid that provides control main pressure to stroke Shift Valve 2 (SV2) to attain a particular range needed for the...

Allison 1000 & 2000 Gen 5 Fault Code:P0976 Shif...

CIRCUIT DESCRIPTION:SS2 is a Normally Closed (N/C) solenoid that provides control main pressure to stroke Shift Valve 2 (SV2) to attain a particular range needed for the next upshift or...

Allison 1000 & 2000 Gen 5 Fault Code:P0974 Shif...

CIRCUIT DESCRIPTION:SS1 is a Normally Closed (N/C) solenoid that provides control main pressure to stroke Shift Valve 1 (SV1) to attain a particular range needed for the next upshift or...