DIAGNOSTIC RESPONSE:DNS, Lock in Neutral 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 P077F sets during steady-state condition when the calculated reverse (R2) gear ratio differs from the known...

DIAGNOSTIC RESPONSE:DNS, RPR 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. This DTC test determines if the on-coming clutch controlled by Pressure Control Solenoid 3 (PCS3) engages during a forward range shift. PCS3 controls the C5 clutch for Neutral, 1st, and Reverse. PCS3 does not control clutches for Reverse 2. PCS3 controls C3 clutch in 3rd and 5th range. CONDITIONS FOR RUNNING THE DTC:1. Hydraulic system...

DIAGNOSTIC RESPONSE:DNS, RPR 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. This DTC test determines if the off-going clutch controlled by Pressure Control Solenoid 3 (PCS3) remains engaged during a forward range shift. PCS3 controls the CS clutch for Neutral, 1st, and Reverse. PCS3 does not control clutches for Reverse 2. PCS3 controls C3 clutch in 3rd and 5th range. CONDITIONS FOR RUNNING THE DTC:1. Hydraulic...

DIAGNOSTIC RESPONSE:DNS, Lock in current range CIRCUIT DESCRIPTION:C1 and C2 latch valve logic states (stroked/destroked) control clutch pressure routing based on latch valve location. The four possible combinations for C1/C2 latch location are the following: C1 Latch Valve C2 Latch ValveDestroked DestrokedStroked DestrokedDestroked StrokedStroked Stroked The TCM knows which solenoids should be commanded to attain a specific range and will use the PS1 switch state (open= PRESSURIZED and closed = EXHAUSTED) to confirm if the actual transmission range attained matches the TCMs known commanded range. PS1 is used by the TCM to sense the PCS2 regulator (trim) valve position (stroked...

DIAGNOSTIC RESPONSE:DNS, Lock in current range CIRCUIT DESCRIPTION:C1 and C2 latch valve logic states (stroked/destroked) control clutch pressure routing based on latch valve location. The four possible combinations for C1/C2 latch location are the following: C1 Latch Valve C2 Latch ValveDestroked DestrokedStroked DestrokedDestroked StrokedStroked Stroked The TCM knows which solenoids should be commanded to attain a specific range and will use the PS1 switch state (open= PRESSURIZED and closed = EXHAUSTED) to confirm if the actual transmission range attained matches the TCMs known commanded range. PS1 is used by the TCM to sense the PCS2 regulator (trim) valve position (stroked...