Clutch efficiency check (stall test)

Clutch efficiency check (stall test)

This test gives an indication of the clutch, hydraulic circuit and engine condition.

The check procedure must be completed within 3-5 seconds; if it is necessary to repeat the test then let the engine idle for several minutes with the selector lever in "P" or "N". This allows the transmission to cool.

To perform the test:

• - bring the engine and the gearbox up to operating temperature;
• - apply the handbrake and depress the brake pedal;
• - select "D";
• - depress the accelerator pedal fully and hold it until the engine reaches a steady RPM (hold for a maximum of 3-5 seconds).

The steady RPM value should be 1900 ± 250 RPM, as read from the instrument panel.

After performing the stall test let the engine idle and with the vehicle stationary, move the selector lever from the "N" to the "R" position. Depress the accelerator by about 30% of full travel, then check that reverse engages without jerkiness or vibration.

Park the vehicle on an incline, then check that the vehicle does not move when the selector lever is in the "P" position. If problems occur then it is necessary to:

• - check and adjust the secondary line pressure;
• - check the electromagnetic clutch and associated components (microswitches in the pedal assembly, power supply brushes).

Shift-lock and Key-lock operation check

Shift-lock

• - Insert the key into the ignition switch, turn it to "MAR" and select "P" with the selector lever;
• - It should be impossible to engage "P" if the brake pedal is not pressed. An acoustic warning signal should sound for at least 10 seconds;
• - If the shift-lock does not operate then check the electrical connections between the brake pedal "stop" switch, the transmission safety control unit and the electromagnet on the selector lever.

Key-lock

• - Check that the ignition key can only be removed from the ignition switch when the selector lever is in "P";
• - If the Key-lock does not operate then check the electrical connections between the ignition switch, the transmission safety control unit and the steering column electromagnet.