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P1831

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

P1831

Transmission downshifting function faulty


Fault symptom

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

Condition

Transmission input shaft speed on downshifting is higher than 225 km/h to 3rd gear 132 km/h to 2nd gear 76 km/h to 1st gear.

Diagnostic help

The fault is probably a mechanical malfunction and can scarcely be due to a fault in the control system. Wear in the transmission should be investigated.

Diagnostic procedure

1 Check the fault symptoms


Check the problem by driving the car as shown in the road test schedule, see . Note any fault symptoms.

Does the fault symptom persist?

yes

Proceed to 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.

Does the diagnostic trouble code recur?

yes

Continue with .


no

The remedial action taken was correct.