Allison
Allison 3000 & 4000 Gen 4 Fault Code: P2669 Actuator Supply Voltage 2 (HSD2) Open
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:SOL OFF, Inhibit TCC operation, Inhibit main modulation, DNA CIRCUIT DESCRIPTION:The high side drivers are connected to the high side circuits of the solenoids and commanded on during normal operation. The high side drivers serve as a master switch to supply battery voltage to the low side drivers. High side drivers are turned on during TCM initialization and remain on during normal operation. High side drivers are turned off during cranking and for certain diagnostic responses. The open circuit diagnostic is determined by monitoring the status of the low side drivers. If two or more of the low side...
Allison 3000 & 4000 Gen 4 Fault Code: P2670 Actuator Supply Voltage 2 (HSD2) Low
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:Yes DNS, SOL OFF (hydraulic default) CIRCUIT DESCRIPTION:The high side drivers are connected to the high side circuits of the solenoids and commanded on during normal operation. The high side drivers serve as a master switch to supply battery voltage to the low side drivers. High side drivers are turned on during TCM initialization and remain on during normal operation. High side drivers are turned off during cranking and for certain diagnostic responses. The low circuit diagnostic is determined by monitoring the status of the low side drivers and high side drivers voltage. If two or more of the...
Allison 3000 & 4000 Gen 4 Fault Code: P2671 Actuator Supply Voltage 2 (HSD2) High
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:DNS, SOL OFF (hydraulic default) CIRCUIT DESCRIPTION:The high side drivers are connected to the high side circuits of the solenoids and commanded on during normal operation. The high side drivers serve as a master switch to supply battery voltage to the low side drivers. High side drivers are turned on during TCM initialization and remain on during normal operation. High side drivers are turned off during cranking and for certain diagnostic responses. High Side Driver 2 (HSD2) supplies battery voltage to the Pressure Control Solenoid 1 (PCS1), Pressure Control Solenoid 2 (PCS2), Pressure Control Solenoid (PCS3), and Shift Solenoid...
Allison 3000 & 4000 Gen 4 Fault Code: P2684 Actuator Supply Voltage 3 (HSD3) Open
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:SOL OFF, Inhibit TCC operation, Inhibit main modulation, DNA CIRCUIT DESCRIPTION:The high side drivers are connected to the high side circuits of the solenoids and commanded on during normal operation. The high side drivers serve as a master switch to supply battery voltage to the low side drivers. High side drivers are turned on during TCM initialization and remain on during normal operation. High side drivers are turned off during cranking and for certain diagnostic responses. The open circuit diagnostic is determined by monitoring the status of the low side drivers. If two or more of the low side...
Allison 3000 & 4000 Gen 4 Fault Code: P2685 Actuator Supply Voltage 3 (HSD3) Low
Posted by PerDiezel Solutions on
DIAGNOSTIC RESPONSE:DNS, SOL OFF (hydraulic default) CIRCUIT DESCRIPTION:The high side drivers are connected to the high side circuits of the solenoids and commanded on during normal operation. The high side drivers serve as a master switch to supply battery voltage to the low side drivers. High side drivers are turned on during Transmission Control Module (TCM) initialization, and remain on during normal operation. High side drivers are turned off during cranking and certain diagnostic responses. The low circuit diagnostic is determined by monitoring the status of the low and high side drivers voltage. If two or more of the low...
