Low Idle Adjustment

Note : chassis equipped with automatic transmission, the speed control switches cannot used adjust engine low idle speed. Attempting set low idle this manner will cause the vehicle electronic control unit (VECU) enter the reprogramming mode resulting the idle speed dropping 550 RPM (650 RPM for non - catalyzed exhaust aftertreatment system), but will not possible set a new idle speed. the reprogramming mode entered, simply turn the speed control switch OFF , and idle speed will return the originally set Resetting low idle speed a chassis equipped with automatic transmission requires a scan tool running the VCADS Consult the VCADS Guide for additional

This section explains the procedure reset the low idle speed using the Speed Control switches.

The vehicle management and control - MAC) system allows the low idle set within the range 550 700 RPM RPM for non - catalyzed exhaust aftertreatment system). This provides flexibility set the low idle the smoothest engine speed for the vehicle.

There are two steps required reset the low idle The first step places the vehicle management and control - MAC) system into the low - idle adjust this mode, vehicle management and control - MAC) ready accept the new idle

The second step actually tell vehicle management and control - MAC) what the new idle speed will

The first phase the process meeting the requirements listed below

1 The vehicle management and control - MAC) system must have the Low - Idle Adjust option enabled the customer data space. This function can disabled the customer .

2 sure there are active faults the

3 The vehicle must stationary .

4 The parking brake must

5 The accelerator pedal (AP) must the idle position (not pressed).

6 The Speed Control ON/OFF switch must turned and OFF 3 times within two this the idle speed will drop 550 and vehicle management and control - MAC) will now ready accept a new sure leave the ignition key the

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Note : the idle speed does not drop 550 RPM after meeting the requirements listed, there may other possible problems which will not allow the idle reset. Refer the vehicle management and control - MAC) Service Manual for troubleshooting

T o complete the resetting the idle continue follows:

1 Depress and hold the accelerator pedal until the desired engine speed reached.

2 Use the speed control switches adjust idle

3 Depress and release the clutch pedal store idle speed.

This speed now locked into vehicle management and control - MAC) the low idle speed.

Note : T o detect a drop when resetting the idle, recommended that the low idle speed set a speed greater than 500

Smart Idle Elevated Idle RPM T ime

This feature will discontinue a ramp for a period time when the engine speed (RPM) reaches its tar The range time can set between 0 and 1092 with a default setting