P0782

Diagnostic Chart:

The PCM uses the Crankshaft Position (CKP) sensor, Transaxle Input Speed Sensor (ISS) and Vehicle Speed Sensor (VSS) to determine engine speed, input shaft speed and output shaft speed. These sensor readings are used to determine the current gear ratio and RPM slip across the torque converter. The PCM uses this information from the sensors to determine if the commanded gear matches the actual gear. During normal driving conditions, the PCM will adapt main line pressure via the Pressure Control (PC) solenoid to prevent slipping and harsh shifts. Shift solenoid 3 is used to apply or release third gear clutch. The PCM controls 3rd gear by controlling the ground for shift solenoid 3. The PCM will turn the solenoid Off (open the driver circuit) when 3rd gear is commanded On to apply 3rd clutch. Shift solenoid 3 is supplied ignition voltage from the fuel pump relay whenever the PCM commands the fuel pump relay On. DTC P0782 sets when 1st gear is being commanded On, and the ratio of the transaxle ISS to the VSS is within ±4% of 3rd gear. This indicates that 3rd gear is stuck On.

DTC PARAMETERS
DTC P0782 will set if the PCM detects 3rd gear ratio within ±4% when:
- 1st gear is being commanded On
- Condition exists for longer than 3 seconds
- Condition exists twice in one ignition cycle
- Transmission ISS is greater than 224 RPM
- Vehicle speed is greater than 5 km/h (3 mph)
- Speed noise parameter = NO
- TCC is commanded Off
- Engine torque is greater than 100 N.m (74 ft-lbs)

DTC P0782 diagnostic runs continuously once the above conditions have been met.

DTC P0782 is a type A DTC.

DIAGNOSTIC AIDS

IMPORTANT: If DTC P0761, P0763, or P0789 is set, diagnose that DTC first. A diagnosed shift solenoid 3 low/high circuit fault DTC may have caused DTC P0782 to set.

Refer to "Test Section Diagnosis" for pressure apply points and for component/location description.

Possible causes of 3rd gear stuck On are listed in the flowchart.

Verify VSS and TRANSMISSION ISS read correctly on Scan tool.

Make sure shift solenoid 3 is not intermittently sticking. Sticking shift solenoid 3 will cause an incorrect ratio in

1st gear as 3rd gear may be trying to apply. Audible sound should be similar for all solenoids. A muffled tone indicates the need for replacement.

3rd clutch should apply and release when air check procedure is performed. If clutch plates are moving normally and no other leaks detected, the problem is probably in the valve body. If clutches are not moving correctly, the problem is in the end cover or an internal clutch assembly problem.

DTC P0732 and P0741 may also set with this DTC.