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PINPOINT TEST A: FUEL PUMP DIAGNOSIS
A18 CHECK EEC RELAY AND WIRING
l Key OFF.
l Remove EEC Relay.
l Key ON, Engine OFF.
l DVOM on 20 volts.
Check relay socket for voltage at Pins C1, or C2 and A or NO.
l Note which pins have voltage present (there should only be voltage on one pin if each pair, if voltage present on both pins of one pair, look for shorted wiring).
l Are voltages greater than 10.5 volts on relay socket?
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A21 CHECK VOLTAGE AT PIN 22 (PROCESSOR)
l Key OFF.
l Battery fully charged.
l Remove EEC-IV processor.
l Install Rotunda Breakout Box, T83L-50-EEC-IV, or Rotunda EEC-IV Monitor 007-00018 or equivalent.
l Key ON, engine OFF.
l DVOM on 20 volt scale.
l Measure the voltage on Pin 22 of the breakout box, or with EEC-IV Monitor, install the appropriate overlay according to engine size and year. Place selector switch "A" on Pin 22, "FP", turn EEC-IV Monitor power on and read voltage on Pin 22 from LCD readout.
l Is voltage greater than 10.5 volts?
Yes
CHECK processor for malfunction. After condition is corrected, GO to «A2».
No.
SERVICE wire between EEC-IV and FP relay/IRCM. CHECK at VIP connector for lead presence. GO to «A2» when condition has been corrected.
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A17 CHECK CHECK POWER SUPPLY TO FP RELAY
l Key OFF.
l Remove fuel pump relay.
l Key ON, Engine OFF.
l DVOM on 20 volt scale.
l Check relay socket for voltage at Pins C1, C2, and A or NO.
l Does relay socket have voltage at 2 pins as indicated?