C1.5 and C2.2 Industrial Engines Caterpillar

There are two separate channels for throttle input. The two channels can have any combination of an analog throttle or a multi-position switched throttle.

The Electronic Control Module (ECM) must be programmed with the type of throttle input that is being used in either position. From the menu, select "Services". On the "Services" screen, select "Throttle Configuration". Select the type of throttle from the following list:

• No throttle

• Analog throttle

• Multi-position throttle switch

The Electronic Control Module (ECM) must be programmed for throttle arbitration. This parameter determines which throttle input has priority. From the menu, select "Services". On the "Services" screen, select "Throttle Arbitration". Select the arbitration method from the following list:

• Highest Wins

• Lowest Wins

• Manual Switch

• Manual with Plausibility

The default setting for throttle arbitration is "Highest Wins".

Illustration 1	g03249099
Typical Range of Throttle

Analog throttles require additional programming. If a multi-position switch is selected, additional parameters must be programmed. Refer to Troubleshooting, "Multiposition Switch Setup". If an analog throttle is selected, the following parameters can be programmed into the ECM.

Throttle Enable Status

This parameter determines the number of installed throttles. This parameter must be programmed before any other parameters are set.

Table 1

Range	Default
Throttle #1, Throttle #1 and Throttle #2, Throttle #2

Lower Diagnostic Limit

This parameter is the minimum throttle voltage that should be detected by the ECM in normal operation when the pedal is in the "off" position. A value below this limit will generate a short circuit diagnostic code. The range of this diagnostic detection area is from 0 percent to the programmed value for the lower position limit.

Table 2

Range	Default
0 to 1.6VDC

Initial Lower Position Limit

This parameter is the maximum throttle voltage that will be interpreted by the ECM as zero throttle. This parameter is used with the value of the lower position limit to make an allowance for manufacturing tolerances between different pedals.

Table 3

Range	Default
0.4 to 1.6VDC

Idle Validation

All analog throttles can have an idle validation switch. If this parameter is programmed to "Enable", the ECM will look for this switch input on pin J1:14 for Idle Validation Switch 1 (IVS1) and J1:15 for Idle Validation Switch 2 (IVS2).

Table 4

Values	Default
Enable Disable

Idle Validation Minimum Off (Open) Threshold

This parameter is the minimum throttle voltage that will be detected by the ECM when the IVS is ON (Closed).

If a voltage is detected below this value with the IVS OFF (Open):

• A fault code will be generated

• The engine will remain at idle

Refer to Table 5 and Table 6.

Table 5

Throttle Position Sensor (TPS)	Idle Validation Switch (IVS)	Throttle Demand Output	Fault Status	Comment
TPS< IVS Min OFF	OFF	Minimum Position	Raise IVS fault	Force throttle demand to minimum
TPS< IVS Min OFF	ON	Throttle Position	No fault	Normal operation

Table 6

Range	Default
0.4 to 1.6VDC

Idle Validation Maximum On (Closed) Threshold

This parameter is the maximum throttle voltage that will be detected by the ECM when the idle validation switch (IVS) is OFF (Open) . If the idle validation switch is OFF (Open), and a signal is detected that is higher than the IVS Max ON value:

• The ECM will generate a fault code

• The engine will remain at idle

Refer to Table 7 and Table 8.

Table 7

Throttle Position Sensor (TPS)	Idle Validation Switch (IVS)	Throttle Demand Output	Fault Status	Comment
TPS> IVS Max ON	OFF	Throttle Position	No fault	Normal operation
TPS< IVS Min Off	ON	Minimum Position	Raise IVS fault	Force throttle demand to minimum

Table 8

Range	Default
0.4 to 1.6VDC

Initial Upper Position Limit

This parameter is the minimum throttle voltage that will be interpreted by the ECM as full throttle. This parameter is used with the value of the upper position limit to make an allowance for manufacturing tolerances between different pedals.

Table 9

Range	Default
3.6 to 4.6VDC

Upper Diagnostic Limit

This parameter is the minimum throttle voltage that is detected by the ECM in normal operation when the pedal is in the maximum position. A value above this limit will generate an open circuit diagnostic code. The range of this diagnostic detection area is from the programmed value of the upper position limit to 5.0VDC.

Table 10

Range	Default
3.6 to 5.0VDC