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Allison

Allison 1000 & 2000 Gen 5 Fault Code:P2669 Actuator Supply Voltage 2 Open

Posted by PerDiezel Solutions on

CIRCUIT DESCRIPTION:HSD2 supplies battery voltage to PCS2, SS1, SS2, SS3 via wire 171. HSD2 is continuously on during normal operation except during brief circuit tests. The TCM regulates control current to the solenoids by switching the appropriate low side driver on and off. DTC P2669 indicates the TCM has detected multiple low side circuits are open while having HSD2 voltage of over a calibrated voltage. DTC P2669 could be caused by open condition in the high side wiring attached to HSD2 (wire 171). ACTION TAKEN WHEN THE DTC SETS:When DTC P2669 is active, the following conditions occur:1. If failure occurs...

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Allison 1000 & 2000 Gen 5 Fault Code:P2670 Actuator Supply Voltage 2 (HSD2) – Low

Posted by PerDiezel Solutions on

CIRCUIT DESCRIPTION:HSD2 supplies battery voltage to PCS2, SS1, SS2, SS3 via wire 171. HSD2 is continuously on during normal operation except during brief circuit tests. The TCM regulates control current to the solenoids by switching the appropriate low side driver on and off. DTC P2670 indicates the TCM has detected that all solenoids connected to the HSD2 are inactive with a supply voltage in the HSD2 circuit lower than a calibrated voltage. DTC 2670 indicates a short-to-ground has occurred in the high side wiring attached to HSD2 (wire 171). ACTION TAKEN WHEN THE DTC SETS:When DTC P2670 is active, the...

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Allison 1000 & 2000 Gen 5 Fault Code:P2671 Actuator Supply Voltage 2 (HSD2) – High (Batt)

Posted by PerDiezel Solutions on

CIRCUIT DESCRIPTION:HSD2 supplies battery voltage to PCS2, SS1, SS2, SS3 via wire 171. HSD2 is continuously on during normal operation except during brief circuit tests. The TCM regulates control current to the solenoids by switching the appropriate low side driver on and off. DTC P2671 indicates the TCM has detected greater than or equal to calibrated voltage in the HSD2 circuit when HSD2 is off during TCM initialization. This indicates a short to battery exists on the high side circuit 171. ACTION TAKEN WHEN THE DTC SETS:When DTC P2671 is active, the following conditions occur:1. If failure occurs while in...

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Allison 1000 & 2000 Gen 5 Fault Code:P2684 Actuator Supply Circuit Voltage 3 Open (HSD3)

Posted by PerDiezel Solutions on

CIRCUIT DESCRIPTION:HSD3 supplies battery voltage to PCS3 via wire 131. HSD3 is continuously on during normal operation except during brief circuit tests. The TCM regulates control current to the solenoids by switching the appropriate low side driver on and off. DTC P2684 indicates the TCM has detected multiple low side circuits are open while having HSD3 voltage of over a calibrated voltage. DTC P2684 could be caused by an open condition in the high side wiring attached to HSD3 (wire 131). ACTION TAKEN WHEN THE DTC SETS:When the DTC P2684 is active, the following conditions occur:1. All ranges will be...

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Allison 1000 & 2000 Gen 5 Fault Code:P2685 Actuator Supply Circuit Voltage 3 Low (HSD3)

Posted by PerDiezel Solutions on

CIRCUIT DESCRIPTION:HSD3 supplies battery voltage to PCS3 via wire 131. HSD3 is continuously on during normal operation except during brief circuit tests. The TCM regulates control current to the solenoids by switching the appropriate low side driver on and off. DTC P2685 indicates the TCM has detected that all solenoids connected to the HSD3 are inactive with a supply voltage in the HSD3 circuit lower than a calibrated voltage. DTC P2685 indicates a short-to-ground has occurred in the high side wiring attached to HSD3 (wire 131). ACTION TAKEN WHEN THE DTC SETS:When the DTC P2685 is active, the following conditions...

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