ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
FUEL INJECTION PUMP CIRCUIT TEST - CONTINUED
Check VLPM located above engine ECM.
N OT E
Use this test to verify VLPM has correct resistance. Also use this procedure if there is problem with tripped
auxiliary breaker. A faulty VLPM may be cause of problem.
Disconnect VLPM connector.
Measure resistance between 1 (+) Batt Machine and 2 (+) Batt Pump of VLPM.
Measure resistance between 3 Ground Pump and 4 (-) Batt Pump of VLPM.
Expected Results. Resistance is less than 1 Ohm between 1 (+) Batt Machine and 2 (+) Batt Pump. Resistance is
less than 1 Ohm between 3 Ground Pump and 4 (-) Batt Pump. Resistance is greater than 10 Ohm between 2 (+)
Batt Pump and 3 Ground Pump.
N OT E
Resistance between 2 (+) Batt Pump and 3 Ground Pump may differ. This is OK.
If result is OK, VLPM is functioning properly.
Replace VLPM if injection pump is replaced.