C1.5 and C2.2 Industrial Engines Caterpillar

Note: Use this procedure only if the engine speed does not change. This fault will not occur in an application that operates at a constant engine speed. Examples of these applications are generator sets and pumps.

Probable Causes

• Diagnostic codes

• Multi-position throttle switch

• Throttle position sensor

Recommended Repairs

Diagnostic Codes

Use one of the following methods to check for active diagnostic codes:

• The electronic service tool

• The display on the control panel

Electronic Service Tool

1. Connect the electronic service tool to the diagnostic connector.

2. Check for active diagnostic codes on the electronic service tool.

3. Investigate any active codes before continuing with this procedure. Refer to Troubleshooting, "Troubleshooting with a Diagnostic Code".

Display on the Control Panel

Note: The following procedure is only applicable if the application is equipped with a display on the control panel.

1. Check the display on the control panel for active diagnostic codes.

2. Troubleshoot any active codes before continuing with this procedure. Refer to Troubleshooting, "Troubleshooting with a Diagnostic Code".

Use the electronic service tool to check the setup of the throttle.

Multi-position Throttle Switch

Note: When the engine is operating and the fault occurs, the configuration of the throttle will not change. Check the configuration of the throttle only if the engine has never run.

Throttle Position Sensor

If a fault is suspected in the throttle sensor, refer to Troubleshooting, "Analog Throttle Position Sensor Circuit - Test".