Pgm-Fi Main Relay - Honda Prelude 1993 Service Manual

Fuel Supply System
PGM-FI Main Relay
Descdption
The PGM-Fl main relay actually contains two individual
retavs.
The relay is located at the left side of the cowl.
One relay is energized whenever the ignition is on which
supplies the battery voltage to the ECM, power to the
fuel injectors, and power for the second relay.
The second r€lay is energized lor 2 seconds when the
ignition is switched on, and when the engine is running
which supplies powet to the fuel pump.
FGM.FI
MAIN RELAY
11-126
! t
Relay Testing
NOTE: lf the car starts and continues to run, the
PGM-FI main relay is OK
1. Remove the PGM-Fl main relay.
2. Attach the b8ttery positive te.minalto the No' 6 ter-
minal and the batt8ry negative terminal to the No.
I terminal of ths PGM-Fl main relay. Then check tot
continuity between the No. 5 terminal 8nd No' 7 tet-
minal of the PGM-FI main r€laY.
a It there is continuity. go on to step 3.
a ll there is no continuity, replace the relay and
TO IGN. 1
TO GROUND
TO ST. SWTTCH
TO ECM {A7, 8}
TO 8AT C)
to EcM (A25, Btl
TO FUEL PUMP
3. Attach the battery positive terminal to the No' 5 tsr-
minal and the battery negative terminal to the No.
2 terminslof the PGM-Fl main relav. Then check that
there is continuity between the No. 1 terminal 8nd
No. 3 terminal ot the PGM-FI main relay.
a lf there is continuity, go on to step 4.
a lf there is no continuity, replace the relay and
relesl.
4.
Aftach the baftery positive terminal to the No. 3 ter-
minal and the batterY negative terminsl to the No.
8 terminalof the PGM-Fl main relav. Then check that
there is continuitv between the No. 5 terminsl and
No. 7 terminal of the PGM-Fl main relay'
a lf there is continuity, the relay is OK.
a lf there is no continuity, replace the relay and
retesl
(cont'dl