Code 55, Closed Throttle Angle Out Of Range

Code will set if learned TP sensor correction is 6.5 degrees or greater.

1. Checks for ISC or TP sensor codes which could cause Code 55.
2. Checks if TP sensor is really out of range or the throttle position switch is open, causing it to look that way.
3. Checks TP sensor adjustment. TP sensor displays uncorrected TP sensor so that it can be used to check TP sensor adjustment.
4. If TP sensor is within range, ISC and throttle switch operation need to be thoroughly checked. Throttle linkage needs to be checked for proper operation, throttle and cruise cables not binding and throttle shaft and blades not binding.

Fig 1: Code 55 Diagnostic Flow Chart (4.0L) Closed Throttle Angle Out Of Range