HOSE AS 8I0718 - Caterpillar

This problem will occur if the truck's transmission is not left in NEUTRAL and the parking brake on while the truck is loading. The fault could also occur if the neutral start system indicates to the PMC that the transmission is not in NEUTRAL, when the transmission is actually in NEUTRAL. Make sure that the operator is leaving the transmission selector in NEUTRAL with the parking brake on during loading.Test Step 1. CHECK THE NEUTRAL START STATUSThis step determines if the neutral start control is correctly signalling the PMC when the transmission is in NEUTRAL.
Turn the key switch to the ON position.
Press the mode switch to Mode "-7-" (system status display).
Press the "Test/Set" switch until circuit "X21"(transmission neutral status) is shown on the display of the POD. Place the shift lever in the FIRST position. If "C21" is displayed on the display of the POD, disconnect the 3 pin harness connector from the neutral start control. If "A21" is then displayed, the PMC is working correctly. Troubleshoot the neutral start control system.
Move the shift lever from the NEUTRAL position to the FIRST position. Expected Result:The display on the POD shows "C21" when the shift lever is in the NEUTRAL position. The display on the POD shows "A21" when the shift lever is in any other position.Results:
OK - The display shows "C21" when the shift lever is in the NEUTRAL position and "A21" when the shift lever is in any other position. This function of the PMC is functioning correctly. Verify that the original fault is still present. If the original fault is still present exit this procedure and perform this procedure again. If no fault is found replace the PMC.STOP
NOT OK - The display shows "A21" when the shift lever is in all positions. Proceed to 2.Test Step 2. CHECK THE PMC
Press the "Test/Set" switch until circuit "X21" (transmission neutral status) is shown on the display of the POD.
With the shift lever in the first position and "C21" is shown on the display of the POD, disconnect the 3 pin harness connector from the neutral start control. Expected Result:The code that shown on the display of the POD changes from "C21" to "A21" when the 3 pin connector is disconnected. Results:
OK - The code that shown on the display of the POD changes from "C21" to "A21" when the 3-pin connector is disconnected. The PMC is operating correctly. Proceed to Test Step 3.
NOT OK - The code does not change. The PMC has failed.Repair: Replace the PMC.STOPTest Step 3. CHECK THE HARNESS
Turn the key start switch to the OFF position.
Disconnect the machine harness connector for the PMC.
Measure the resistance between socket 2 and 16 of the machine harness connector for the PMC . If continuity is found, line 891-BU is shorted to 251-BK or to vehicle ground. Expected Result:The resistance is greater than 5000 ohms.Results:
OK