Transfer Pump Control Unit (Protege 4WD Only)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1990 Mazda RX-7, 1990 Mazda Protege, 1990 Mazda MX-6, 1990 Mazda MX-5 Miata, and 1990 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition on. Ensure fuel gauge reads more than half full and transfer pump operation is heard. Ground transfer pump connector terminal Yellow/Blue and verify pump stops. Remove the ground from terminal Yellow/Blue and verify pump operates after about 10 seconds. If not, see TRANSFER PUMP in this article. See Figure .
- Turn ignition on. Ground fuel pump control unit terminal "M" with jumper wire. Verify that zero volts is present at control unit terminal "N". Remove the jumper wire and check that voltage is 12 volts in about 10 seconds. If not, disconnect transfer pump connector. Turn ignition on. Verify that the voltage is 12 volts at terminal "N" of the transfer pump connector. If not, replace transfer pump control unit.