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Allison

Allison 3000 & 4000 Gen 4 Fault Code: P0731 Incorrect 1st Gear Ratio

Posted by PerDiezel Solutions on

DIAGNOSTIC RESPONSE:DNS, Attempt 2nd, then 5th CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses input from the turbine speed and output speed sensors to determine the current commanded for steady-state gear ratio. The TCM then compares the known gear ratio to the calculated gear ratio for the current range. CONDITIONS FOR RUNNING THE DTC:1. Hydraulic system is pressurized.2. No shift in progress.3. Hydraulic default condition not present.4. Output speed is above 200 rpm.5. Engine initialization or shutdown is not in process. CONDITIONS FOR SETTING THE DTC:DTC P0731 sets during steady-state condition when the calculated first gear ratio differs from the known...

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Allison 3000 & 4000 Gen 4 Fault Code: P0732 Incorrect 2nd Gear Ratio

Posted by PerDiezel Solutions on

DIAGNOSTIC RESPONSE:DNS, Attempt 3rd, then 5th CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses input from the turbine speed and output speed sensors to determine the current commanded for steady-state gear ratio. The TCM then compares the known gear ratio to the calculated gear ratio for the current range. CONDITIONS FOR RUNNING THE DTC:1. Hydraulic system is pressurized.2. No shift in progress.3. Hydraulic default condition not present.4. Output speed is above 200 rpm.5. Engine initialization or shutdown is not in process. CONDITIONS FOR SETTING THE DTC:DTC P0732 sets during steady-state condition when the calculated second gear ratio differs from the known...

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Allison 3000 & 4000 Gen 4 Fault Code: P0733 Incorrect 3rd Gear Ratio

Posted by PerDiezel Solutions on

DIAGNOSTIC RESPONSE:DNS, Attempt 4th, then 6th CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses input from the turbine speed and the output speed sensors to determine the current commanded steady-state gear ratio. The TCM then compares the known gear ratio to the calculated gear ratio for the current range. CONDITIONS FOR RUNNING THE DTC:1. Hydraulic system is pressurized.2. No shift in progress.3. Hydraulic default condition not present.4. Output speed is above 200 rpm.5. Engine initialization or shutdown is not in process. CONDITIONS FOR SETTING THE DTC:DTC P0733 sets during steady-state condition when the calculated third gear ratio differs from the known...

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Allison 3000 & 4000 Gen 4 Fault Code: P0734 Incorrect 4th Gear Ratio

Posted by PerDiezel Solutions on

DIAGNOSTIC RESPONSE:DNS, Attempt 5th, then 3rd CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses input from the turbine speed and output speed sensors to determine the current commanded for steady-state gear ratio. The TCM then compares the known gear ratio to the calculated gear ratio for the current range. CONDITIONS FOR RUNNING THE DTC:1. Hydraulic system is pressurized.2. No shift in progress.3. Hydraulic default condition not present.4. Output speed is above 200 rpm.5. Engine initialization or shutdown is not in process. CONDITIONS FOR SETTING THE DTC:DTC P0734 sets during steady-state condition when the calculated fourth gear ratio differs from the known...

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Allison 3000 & 4000 Gen 4 Fault Code: P0735 Incorrect 5th Gear Ratio

Posted by PerDiezel Solutions on

DIAGNOSTIC RESPONSE:DNS, Attempt 6th, then 3rd, then 2nd CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses input from the turbine speed and output speed sensors to determine the current commanded for steady-state gear ratio. The TCM then compares the known gear ratio to the calculated gear ratio for the current range. CONDITIONS FOR RUNNING THE DTC:1. Hydraulic system is pressurized.2. No shift in progress.3. Hydraulic default condition not present.4. Output speed is above 200 rpm.5. Engine initialization or shutdown is not in process. CONDITIONS FOR SETTING THE DTC:DTC P0735 sets during steady-state condition when the calculated fifth gear ratio differs from...

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