Perkins 1106D Troubleshooting Manual page 149

KENR6201-01
Illustration 51
Schematic for the bypass harness for the application
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 connector from the ECM.
C. Connect a bypass harness to the ECM.
D. Remove the fuses from the Battery+ wire of the
bypass harness and connect the Battery+ and the
Battery- wires directly to the battery terminals.
Note: This bypass directly connects the circuit for the
keyswitch to the ECM. The ECM will remain powered
until the connection to the unswitched battery+ line
is disconnected. Remove the fuses from the in-line
fuse holder to power down the ECM. Do not connect
the bypass to the battery terminals or do not remove
the bypass from the battery terminals without first
removing the in-line fuses.
E. Use a multimeter to measure the voltage between
P2:46 and ground. The voltage should be +5 Volts
DC.
Note: Remove the bypass harness and restore all
wiring to the original condition after testing.
Expected Result:
If the measured voltage between P2:46 and ground
is +5 Volts DC, installing the bypass has eliminated
the fault.
This document is printed from SPI². Not for RESALE
Results:
•
OK – The symptoms disappear when the bypass
harness is installed. Also, the symptoms return
when the bypass harness is removed. The fault
is in the wiring for the application that supplies
power to the ECM. Check for aftermarket engine
protection switches that interrupt power. Send the
machine to the OEM dealer to repair. STOP.
•
Not OK
Repair: Perform the following procedure:
1. Connect the bypass to another battery and
verify if the fault is resolved. If the fault is
resolved, the fault is with the batteries on the
application.
2. If the fault still exists, make sure that the
latest flash file for the application is installed
in the ECM. Refer to Troubleshooting, "Flash
Programming".
3. Contact Perkins Global Technical Support.
Note: This consultation can greatly reduce the repair
time.
149
Troubleshooting Section
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