Road test

ROAD TEST

Before carrying out the road tests, some preliminary checks must be carried out:

• check automatic transmission fluid level;
• check and adjust accelerator and gear selection cable control cables.

After carrying out preliminary checks, operate the transmission in such a way as to check all functions, as follows:

• operation of transmission;
• operation of Kick-Down;
• that the exhaust brake cuts in correctly during the transfer from "D" (Drive) to "L" (Low);
• clutch condition (stall test).

Check gearbox operation

To carry out this check, perform a road test as follows:

• start the engine, allow to warm up and carry out manoeuvres "N"-"R" and "N"-"D". The vehicle should not lag during idling and "D" and "R" should engage without knocking or noise;
• with selector lever set to "D", carry out a series of accelerations to 25%, 50% and 100% of the accelerator pedal travel respectively. Check that speeds change from short to long ratios by accelerating to 50, 80 and 100 Km/h. Speed changes should occur without vibrations, knocks or particular noise.

Checking Kick-Down operation

In order to carry out this check, perform a road test as follows:

• with the selector lever set to "D", accelerate the vehicle to 90 Km/h, then release the accelerator pedal completely and when the vehicle decelerates to a speed of 80 Km/h, press the accelerator pedal fully down (through the Kick-Down travel). Under these conditions the engine rpm should reach 4600 ± 250 rpm with a response time of less than 2 seconds. The speed change should be immediate, without knocks or vibrations;
• carry out a further check starting at 120 Km/h: under these conditions, press the accelerator pedal fully down when the engine rotation speed should reach 5100 ± 250 rpm with a response time of less than 2 seconds.

Checking the engine brake cuts in correctly when changing from "D" to "L"

To carry out this check, perform a road test as follows:

• with the selector lever set to "D", accelerate the vehicle to about 110 Km/h, then release the accelerator pedal fully. When the vehicle decelerates to a speed of 100 km/h, move the selector lever to "L". Under these conditions, with a response time of less than 2 seconds, the engine rpm should reach 4300 ± 250 rpm. The speed change should be immediate and without knocks or vibrations;
• carry out a further check starting at 60 Km/h: under these conditions, when the accelerator pedal is fully depressed , engine rpm should reach 3700 ± 250 rpm with a response time of less than 2 seconds.