Troubleshooting

RENR2696-01 183
Troubleshooting Section
Test Step 3. Check the Supply Voltage at
the Machine Interface Connector
g00856527
Illustration 94
Breakout T
g00856174
Illustration 95
Connections in the J20/P20 M a chine Interface Connector for the fuel injection pump
A. Disconnect the machine interface connector
P20 from ECM connector J1 and insert a 70 Pin
Breakout T.
B. Reconnect the harness.
C. Turn the keyswitch to the ON position.
D. Measure the voltage between P20:48 + Pump
Supply and P20:58 - Pump Supply.
Expected Result:
The measured voltage is between 11.0 VDC and 13.5
VDC for a 12 volt system and between 22.0 VDC and
27.0 VDC for a 24 volt system with no suspected
intermittent problems at this time.
Results:
•
OK – Proceed to Test Step 4.
•
Intermittent voltage or no voltage – Proceed to
Test Step 5.
•
Voltage is out of range
Repair: The problem is in the wiring for the
machine interface connector. Repair the wire
harness or replace the wire harness. Verify that the
repair has eliminated the problem.
STOP.