E0641-04-Rhm 5V Reference Voltage Shorted To Low Source - New Holland CX720 Repair Manual

E0641-04-RHM 5V Reference Voltage Shorted to Low Source

(A.50.A.91.60 - G.30.B.53)
E0641-04 - RHM 5V Reference Voltage Shorted to Low Source
Cause:
The Right Hand Module (RHM) has detected that the RHM 5V Reference Voltage circuit is <4.5 volts .
Possible failure modes:
1. The RHM 5V Reference wiring is shorted to ground.
2. RHM internal failure.
Solution:
1. Verify the fault is present. Enter the Infoview monitor - "Diagnose info" screen, "Console" sub menu. Select
"RHM 5V Reference Voltage" and observe the voltage.
The normal operating range for the RHM 5V Reference Voltage circuit is 4.5 - 5.5 volts .
A. If the voltage reading is 4.5 volts or less, continue with Step 2.
B. If the voltage reading is within the proper limits, the shorted wire may not be grounded at this time. Con-
tinue troubleshooting at Step 4.
2. Look for the shorted wire. Turn off the ignition switch. Disconnect the Right Console Harness connector X026
. Using the proper tool, remove pin 16 wire 316 pink from connector X026 . With the wire removed from the
connector, reconnect X026 to the RHM. Turn the ignition back on and recheck the RHM 5 V Reference Voltage.
A. If the voltage is below 4.5 volts , then continue to Step 3.
B. If the voltage now reads between 4.5 - 5.5 volts , the short is in the wiring harness. Locate and repair the
short. Reinstall the wire removed for troubleshooting, continue at Step 4.
3. Verify the RHM is good. Turn off the ignition switch. Disconnect the Right Console Harness connector X026
. Using the proper tool, remove pin 17 wire 319 pink from connector X026 . With the wire removed from the
connector, reconnect X026 to the RHM. Turn the ignition back on and recheck the RHM 5V Reference voltage.
A. If the voltage is below 4.5 volts , then the fault is in the RHM. Replace the RHM. Continue troubleshooting
at Step 4.
B. If the voltage now reads between 4.5 - 5.5 volts , the short is in the wiring harness. Locate and repair the
short. Reinstall the wire removed for troubleshooting, continue at Step 4.
4. Visually inspect the harness and connectors for damage, bent, corroded or dislocated pins, broken or pinched
wires.
A. Repair any damage found during visual inspection.
B. If no damage is found, erase the fault code and continue operation.
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2 4/7/2006