CIRCUIT DESCRIPTION:Pressure Control Solenoid 2 (PCS2) controls oncoming, off-going, and holding pressure to any one of the five clutches. This solenoid is referred to as a Pressure Proportional to Current (PPC) solenoid since the output hydraulic pressure supplied by this solenoid is proportional to the controlled current command. DTC P0777 sets when the TCM detects an incorrect oncoming ratio (range-to-range) for an accumulated number of occurrences. The TCM uses information from the turbine and output speed sensors to detect if a clutch is in a tie-up condition or if three clutches are applied. The clutch being controlled by PCS2 varies...

CIRCUIT DESCRIPTION:The 4WD low signal circuit notifies the TCM that the vehicle is in 4WD low range. When this function is enabled, the TCM adjusts specific shift calibration values to accommodate for changes in vehicle performance which result from the shift to low range at the transfer case. Wires used for this function can vary depending on the vocational package used, therefore it is important to check the diagnostic tool and/or the calibration summary to see which wires are implemented. Wires 102 and 103 (signal ground return) should be used in part time high N/V input function (CC1) applications along...

CIRCUIT DESCRIPTION:The Pressure Switch Manifold (PSM) is a multiple-switch assembly made up of three Normally Open (N/O) and one Normally Closed (N/C) pressure switches. PS1 monitors SV1 positioning and relays it to the TCM. DTC P0842 sets during steady state (all shift valves are commanded to their proper state and a valid range is attained) operation when shift valve 1 is in the destroked state (commanded off) and PS1 status is detected as stroked (pressurized/on). The intent of this DTC is to detect shorts-to-ground in the pressure switch wiring circuit or the pressure switch. This diagnostic test is designed to...

CIRCUIT DESCRIPTION:The Pressure Switch Manifold (PSM) is a multiple-switch assembly made up of three Normally Open (N/O) and one Normally Closed (N/C) pressure switches. PS1 monitors SV1 positioning and relays it to the TCM. DTC P0843 sets during steady state (all shift valves are commanded to their proper state and a valid range is attained) operation when SV1 is in the stroked state (commanded ON) and PS1 status is detected as destroked (Exhausted/OFF). The intent of this DTC is to detect an open condition in the pressure switch wiring circuit or the pressure switch. This diagnostic test is designed to...

CIRCUIT DESCRIPTION:The Pressure Switch Manifold (PSM) is a multiple-switch assembly made up of three Normally Open (N/O) and one Normally Closed (N/C) pressure switches. PS2 monitors SV2 positioning and relays it to the TCM. DTC P0847 sets during steady state (all shift valves are commanded to their proper state and a valid range is attained) operation when SV2 is in the stroked state (commanded OFF) and PS2 status is detected as stroked (Pressurized/ON). The intent of this DTC is to detect shorts-to-ground in the pressure switch wiring circuit or the pressure switch. This diagnostic test is designed to compare the...