C2.4 Tier 4 Final Engines for Caterpillar Built Machines Caterpillar

Motorized Valve - Test

Usage:

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Table 1
Code	Code Description	Conditions Present	Response
523580-2	Intake Throttle Feedback Error	Battery Voltage Is Normal. Deviation of throttle position is not corrected in 20 times of duty error recovery action for 5 seconds or more.	Intake Throttle 100% open Warning Level 2 Engine derate
523582-3	Intake Throttle Lift Sensor: High	Battery Voltage Is Normal Sensor Supply Voltage VCC# Is Normal. Intake throttle lift sensor voltage: 4.848V or more for 3 seconds or more.
523582-4	Intake Throttle Lift Sensor: Low	Battery Voltage Is Normal Sensor Supply Voltage VCC# Is Normal. Intake throttle lift sensor voltage: 0.151V or less for 3 seconds or more.

Note: The intake throttle operates only when an active regeneration is in process. After repairs are made perform the “Intake Throttle Override” within “Cat ET Service Features”

Note: A -3 code is detecting an open circuit or +B short circuit of the sensor or wiring harness. A -4 code is detecting a ground short circuit of the sensor or harness. The 523580-2 code is often also caused by a harness problem.

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Illustration 1	g06111156

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Table 2
Troubleshooting Test Steps	Value	Results
1. Inspect Electrical Connectors and Wiring A. Check that the connector is fully seated at the sensor. B. Check that the wires to the connector are not pulled tight at the connector, not rubbing, not broken. C. Check that the connector pins and sockets are not damaged and aligned correctly. D. Check the harness for corrosion, abrasion, and pinch points from the sensor to the Engine ECM. Check that Engine ECM pins are not bent and connector is fully seated.	Loose connections, poor routings, damaged wires	Result: There is a fault in a connector or wiring. Replace the engine harness. Result: There is no fault found in harness. IF this is an intermittent issue, it is likely the harness. Thoroughly inspect the harness before replacing the intake throttle.

If no issues were found, contact your TC before replacing the intake throttle valve since these codes are most likely related to a problem with the harness .