Jeep Cherokee 1988 Quick Start Manual page 7

other end of hose into a container of at least one liter or more
capacity.
5) Run fuel pump by installing a jumper wire into diagnostic
connector terminals D1-5 and D1-6. Be sure to pinch off fuel return
line or most of fuel will be returned to fuel tank.
EGR Solenoid Test
1) Verify that vacuum is present at vacuum fitting "C" of
EGR solenoid. See Fig. 4. Remove vacuum connector from "A" and "B".
Connect a vacuum gauge to "B".
2) Start and idle engine. There should be no vacuum at "B".
Disconnect electrical connector "D" from solenoid. There should now
be vacuum at "B".
Fig. 4: EGR Solenoid Test Points
Courtesy of Chrysler Motors.
MAP Sensor Test
1) Inspect MAP sensor hoses and connections. Repair as
necessary. With ignition on and engine off, test MAP sensor output
voltage at connector terminal "B". (Marked on sensor body). See
Fig. 5. Output voltage should be 4 to 5 volts.
2) To verify wiring harness condition, test ECU terminal C-6
for same voltage described. Test MAP sensor supply voltage at sensor
connector terminal "C" with ignition on.