90365 Mariner VALVE, ENRICHER

Test Step 1. CHECK THE THROTTLE FOR PROPER OPERATION
Remove the electrical power from the ECM.
Inspect the throttle linkage for components with the following conditions:
Loose
Bent
Broken
Missing
WornNote: The sensor stops are not intended to be the primary means of limiting the travel of the throttle. If you apply excessive force to the sensor stops you will damage the sensor assembly.
Move the throttle throughout the entire range. The throttle should move without binding and without excessive drag. Expected Result:The throttle linkage is in good condition. The throttle moves without binding and without excessive drag.Results:
OK - The throttle linkage is in good condition. The throttle operates properly. Proceed to Test Step 2.
Not OK - One of the following conditions exist: The throttle linkage is not in good condition. The throttle binds or the throttle has excessive drag.Repair: Identify the source of the mechanical problem and make repairs. Replace parts, if necessary.Proceed to Test Step 2 when the throttle operates properly.Test Step 2. ADJUST THE THROTTLE LINKAGE FOR THE LOW IDLE POSITION
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Restore the electrical power to the ECM. Do not start the engine.
Place the throttle in the low idle position.
Observe the duty cycle for the throttle position sensor on Cat ET. Note: Adjustment of the sensor stops is not necessary.
Adjust the throttle linkage in order to achieve a five to ten percent duty cycle while the throttle is in the low idle position. Expected Result:The duty cycle is between five and ten percent when the throttle is in the low idle position.Results:
OK - The duty cycle is between five and ten percent when the throttle is in the low idle position. Proceed to Test Step 3.
Not OK - The throttle linkage can not be adjusted in order to obtain a five to ten percent duty cycle when the throttle is in the low idle position. There is a problem with the throttle linkage.Repair: Repair the throttle linkage. Replace parts, if necessary. Verify that the problem is resolved.STOPTest Step 3. ADJUST THE THROTTLE LINKAGE FOR THE HIGH IDLE POSITION
Place the throttle in the high idle position.
Observe the duty cycle for the throttle position sensor on Cat ET. Note: Adjustment of the sensor stops is not necessary.
Adjust the throttle linkage in order to achieve a 90 to 95 percent duty cycle when the throttle lever is in the high idle position. Expected Result:The duty cycle is between 90 to 95 percent when the throttle is in the high idle position.Results:
OK - The duty cycle is between 90 to 95 percent when the throttle is in the high idle position.Repair: Perform the following procedure:
Verify that the duty cycle is between five and ten percent when the throttle is in the low idle position.
Verify that the duty cycle is between 90 and 95 percent when the throttle is in the high idle position. If the duty cycle is not correct at either throttle position, repeat this procedure.If the throttle linkage cannot be adjusted in order to meet the specifications, replace the throttle lever assembly.Verify that the problem is resolved.STOP
Not OK - The throttle linkage can not be adjusted in order to obtain a 90 to 95 percent duty cycle when the throttle is in the high idle position. There is a problem with the throttle linkage.Repair: Repair the throttle linkage. Replace parts, if necessary.Verify that the problem is resolved.STOP