P0736

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 P0736 sets if reverse gear is commanded and the TCM detects an actual gear ratio other than reverse.

DTC PARAMETERS
DTC P0736 sets if reverse is commanded and the TCM detects an actual gear ratio other than reverse when:
^ Ignition voltage is at least 10.5 volts
^ Engine Speed is at least 400 RPM
^ Transaxle has been in reverse gear for at least 8 seconds
^ Transmission OSS is at least 500 RPM
^ Condition exists for 12 seconds

DTC P0736 diagnostic runs continuously when the above conditions have been met.

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

DTC P0736 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 4 may not produce any audible click noises when turned on or off. Shift solenoid 4 cannot be tested by listening for audible click noises. Shift solenoid 4 may be stuck closed if the vehicle has all of the following symptoms:
^ 1.45 Gear Ratio in 1st gear
^ TCC stalls engine in 2nd gear
^ Slips in Reverse

Possible causes of incorrect reverse gear ratio:
^ Shift solenoid 4 stuck closed
^ Line PC solenoid (SLT) stuck closed
^ Stuck valves in valvebody
^ Direct Clutch (C2)
^ Low and Reverse Clutch (B3)
^ 1-2, Reverse Clutch (B5)
^ TCM
^ Inaccurate speed sensors

Reverse gear ratio: 3.121:1