P0735

Diagnostic Chart:

The transaxle control module (TCM) uses the transaxle input speed sensor (ISS) and transaxle output speed sensor (OSS) to determine input shaft speed and output shaft speed, these sensor readings are used to determine the current gear ratio. The TCM uses this information to determine if the commanded gear matches the actual gear. DTC P0735 sets if 5th gear is commanded and the TCM detects an actual gear ratio other than 5th gear.

DTC PARAMETERS
DTC P0735 sets if 5th gear is commanded and the TCM detects an actual gear ratio other than 5th gear when:
^ Ignition voltage is at least 10.5 volts
^ Engine Speed is at least 400 RPM
^ Transaxle has been in a forward gear for at least 8 seconds
^ APP Angle is at least 10%
^ Transmission OSS is at least 500 RPM
^ Condition exists for 12 seconds

DTC P0735 diagnostic runs continuously when the above conditions have been met.

The TCM will command Trans. Protection Mode On if this DTC is active.

DTC P0735 is a type A DTC.

DIAGNOSTIC AIDS

IMPORTANT: If DTC P0717, P0722, P0963. P0973. P0974, P0976, P0977, P0979, P0980, P0982, or P0983 is set, diagnose that DTC first.

Observe transmission ISS and transmission OSS with a Scan tool. Compare with a known good vehicle to determine if the speed sensors are reading correctly.

Shift solenoid 2 may not produce any audible click noises when turned on or off. Shift solenoid 2 cannot be tested by listening for audible click noises. Shift solenoid 2 may be stuck open if the vehicle has all of the following symptoms:
^ 2.89 Gear Ratio when 1st gear
^ Harsh 1-2 upshift
^ 1.28 Gear Ratio when in 5th gear

Shift solenoid 1 produces an audible click noise when turned ON, but may not when turned OFF. Do not replace shift solenoid 1 because it does not click OFF.

Possible causes of incorrect 5th gear ratio:
^ Shift solenoid 1 stuck closed
^ Shift solenoid 2 stuck open
^ Shift solenoid 3 stuck closed
^ Line pressure control solenoid stuck closed
^ Shift Pressure solenoid stuck closed
^ Stuck valves in valvebody
^ Forward Clutch (C1)
^ Direct Clutch (C2)
^ 4-5 Clutch (C3)
^ TCM
^ Inaccurate speed sensors

5th gear ratio: 0.982:1