LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Tests W/Codes - 2.0L/2.0L Turbo) >> Diagnostic Charts >> Test NS-3A - Checking Fuel Pump

Test NS-3A - Checking Fuel Pump

WARNING: This page is about a different car, the 1994 Plymouth Laser and 1994 Eagle Talon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS .
  1. On turbo vehicle, go to step 6). On non-turbo vehicle, turn ignition off. Connect jumper wire between battery positive terminal and single-wire fuel pump check connector Black/White wire, located near battery in engine compartment. Listen for fuel pump operating sound at fuel filler pipe.
  2. If fuel pump operating sound cannot be heard, go to step 4). If fuel pump operating sound can be heard, remove jumper wire from fuel pump check connector. Disconnect Multi-Point Injection (MPI) control relay connector. MPI control relay is located on right side of center console, next to Electronic Control Unit (ECU).
  3. Measure resistance between single-wire fuel pump check connector Black/White wire and MPI control relay harness connector terminal No. 2 (Black/Green wire). If resistance is more than 10 ohms, repair open circuit in Black/Green wire or Black/White wire. Perform TEST VER-1 . If resistance is less than 10 ohms, replace MPI control relay. Perform TEST VER-1.
  4. Disconnect fuel pump 2-pin connector at fuel tank. Measure voltage at fuel pump 2-pin connector terminal No. 2 (Black/White wire). If voltage is less than 10 volts, repair open Black/White wire between fuel pump check connector and fuel pump 2-pin connector. Perform TEST VER-1.
  5. If voltage is more than 10 volts, turn ignition off. Measure resistance between fuel pump 2-pin connector terminal No. 1 (Black wire) and ground. If resistance is more than 10 ohms, repair Black wire for open circuit to ground. Perform TEST VER-1. If resistance is less than 10 ohms, replace fuel pump. Perform TEST VER-1.
  6. Turn ignition off. Connect jumper wire between battery positive terminal and single-wire fuel pump check connector Black/White wire, located near battery in engine compartment. Listen for fuel pump operating sound at fuel filler pipe.
  7. If fuel pump operating sound cannot be heard, go to step 9). If fuel pump operating sound can be heard, remove jumper wire from fuel pump check connector. Disconnect Multi-Point Injection (MPI) control relay connector. MPI control relay is located on right side of center console, next to Electronic Control Unit (ECU).
  8. Measure resistance between fuel pump connector terminal No. 1 (Black/White wire) and MPI control relay harness connector terminal No. 2 (Black/Green wire). If resistance is more than 10 ohms, repair open circuit in Black/Green wire or Black/White wire. Perform TEST VER-1. If resistance is less than 10 ohms, replace MPI control relay. Perform TEST VER-1.
  9. Disconnect fuel pump 4-pin connector at fuel tank. Using DRB, activate fuel pump. Measure voltage at fuel pump 4-pin connector terminal No. 1 (Black/White wire). If voltage is less than 10 volts, repair open Black/White wire or Black/Green wire between fuel pump 4-pin connector and MPI control relay connector. Perform TEST VER-1 .
  10. If voltage is more than 10 volts, turn ignition off. Measure resistance between fuel pump 4-pin connector terminal No. 3 (Black wire) and ground. If resistance is more than 10 ohms, repair Black wire for open circuit to ground. Perform TEST VER-1. If resistance is less than 10 ohms, replace fuel pump. Perform TEST VER-1.
scientia non olet · About LEMON Manuals