C7.1 Industrial Engine and Generator Set Caterpillar

There are two separate channels for throttle input. The two channels can have any combination of a digital throttle that uses a Pulse Width Modulated (PWM) signal, 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

• PWM 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

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

Illustration 1	g01785156
Typical Range of Throttle (1) Lower Diagnostic Limit (Default=5) (2) Lower Position Limit (Default=10) (3) Initial Lower Position (Default=20) (4) Idle Validation Minimum Off Threshold (Default=21) (5) Idle Validation Maximum On Threshold (Default=25) (6) Lower Dead Zone % (Default=8) (7) Upper Dead Zone % (Default=5) (8) Initial Upper Position (Default=70) (9) Upper Position Limit (Default=85) (10) Upper Diagnostic Limit (Default=95)

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

Lower Diagnostic Limit

This parameter is the minimum throttle percentage 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 1

Range	Default
0 to 100%	5%

Lower Position Limit

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

Table 2

Range	Default
0 to 100%	10%

Initial Lower Position Limit

This parameter is the maximum throttle percentage 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 to 100%	20%

Idle Validation

All analog throttles and digital throttles can have an idle validation switch. If this parameter is programmed to "Yes", the ECM will look for this switch input on pin J1:22 for Idle Validation Switch 1 (IVS1) and J1:40 for Idle Validation Switch 2 (IVS2).

Table 4

Values	Default
No Yes	No

Idle Validation Minimum Off (Open) Threshold

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

If the ECM detects a throttle percentage below this value with the idle validation switch OFF (Open), a fault code will be generated and 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 to 100%	21%

Idle Validation Maximum On (Closed) Threshold

This parameter is the maximum throttle percentage that will be detected by the ECM when the idle validation switch (IVS) is OFF (Open) . When the idle validation switch is OFF (Open) and the ECM detects a signal that is higher than the programmed value for IVS Max ON, the ECM will generate a fault code and 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 to 100%	25%

Lower Dead Zone

This parameter is a throttle range above the initial lower position limit before the engine will increase in rpm.

Table 9

Range	Default
0 to 100%	5%

Upper Dead Zone

This parameter is a throttle range that is below the initial upper position limit that does not allow the engine speed to increase.

Table 10

Range	Default
0 to 100%	5%

Initial Upper Position Limit

This parameter is the minimum throttle percentage 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 11

Range	Default
0 to 100%	70%

Upper Position Limit

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

Table 12

Range	Default
0 to 100%	85%

Upper Diagnostic Limit

This parameter is the minimum throttle percentage 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 100 percent.

Table 13

Range	Default
0 to 100%	95%