P0733

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 P0733 sets if 3rd gear is commanded and the TCM detects an actual gear ratio other than 3rd gear.

DTC PARAMETERS
DTC P0733 sets if 3rd gear is commanded and the TCM detects an actual gear ratio other than 3rd 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 P0733 diagnostic runs continuously when the above conditions have been met.

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

DTC P0733 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 and 4 do not produce any audible click noises when turned on or off. Shift solenoids 2 and 4 may not be tested by listening for audible click noises. Use the symptom chart to determine if shift solenoids 2 or 4 may be stuck open or closed.

Shift solenoid 1 produces an audible click noise when turned ON, but may not when turned OFF. Shift solenoid 3 may produce a louder click noise when turned OFF than when turned ON. This is normal, and is not reason to replace shift solenoids 1 or 3.

Possible causes of incorrect 3rd gear ratio:
^ Shift solenoid 1 stuck closed
^ Shift solenoid 2 stuck open
^ Shift solenoid 3 stuck closed
^ Shift solenoid 4 stuck open
^ Shift solenoid 5 stuck open
^ Line pressure control solenoid stuck closed
^ Stuck valves in valvebody
^ Forward clutch (C1)
^ 3rd Gear band
^ Inaccurate speed sensors
^ TCM

3rd gear ratio: 1.889:1