P1830

TRANSMISSION SHIFTING FUNCTION FAULTY





Fault Symptom.
CHECK GEARBOX indicator lamp on.
The system's emergency operation program has been activated.

Conditions.
The car's speed is higher than 25 km/h and the last gear shift took place more than 5 seconds ago. The difference in rpm should then not be more than 3% and no longer than 1 second.

Diagnostic Help.
The transmission control module calculates the ratio between input and output shaft speeds. For each gear there is a fixed ratio which is determined by the gearing. The fault is probably a mechanical malfunction and can scarcely be due to a fault in the control system. Wear in the transmission can give rise to harsh shifting and failure of the lock-up function.





Procedure.
1. Check the fault symptoms
Check the trouble by driving the car in accordance with the test driving schedule. Make a note of any fault symptoms.

Any fault symptoms?

YES: Proceed to "Mechanical and Hydraulic Faults", Mechanical and Hydraulic Faults and then continue with point 2.
NO: Continue with point 2.

2. Final check

Clear the diagnostic trouble code. Drive the car on test at varying engine loads and speeds so that upshifts and downshifts through all the gears, with and without kick-down, are performed. Obtain readouts of any diagnostic trouble codes that are generated.

Has the diagnostic trouble code recurred?

YES: Continue as described under "Before Changing A Control Module". Before Changing A Control Module
NO: The remedial action taken was correct.