Cherokee 2WD L4-150 2.5L VIN H TBI (1988)
Fuel Pump Relay: Description and Operation
Relay Locations
This relay has voltage applied to it from the battery through the ignition switch. The ECU controls this relay by applying or taking away the ground from
its circuit. When the ground is applied, the relay is energized, and current is allowed to flow to the fuel pump.
The ECU controls this relay for safety purposes also. In the event that the vehicle stalls, if no tach signal is sent to the ECU it will not apply the ground
to this relay, which will prevent voltage from getting to the fuel pump.
