Honda Prelude 1993 Service Manual page 312

PGM-FI System
Troubleshooting Flowchart
,g:
-g-
- Manifold Absolute Pressure {MAP} Sensor lcont'dl -
MAP SENSOR
l l
'1i
r:ttl
Hrl
VACUUM PUMP/
GAUGE
A973X-041-XXXXX
#21 HOSE
1 1 - 6 8
- The MIL has boon reponod on.
- With sorvic€ chock connector
jumpod ls6o pago 1 142), code
5 is indicatod.
Do the ECM Reset Procedure {see
p a g e 1 1 - 4 3 ) .
Start the engine and keep engine
speed at 2,000 rpm tor one
minute with the manualtransmas
sion in neutral {A/T: @ or S po-
sition).
- Intgrmitl6nt lailuro, 3y3tom is
OK al this tlm6 lt$t ddvo mav
bo nocoasaryl.
- Chock vacuun ho3or, PiPo3
ond connoctionS.
- Mako turo all conn9ctota ar6
30cu16,
ls the MIL on and does it indi-
cate code 5?
Turn the ignition switch OFF.
Disconnect #21 hose lrom the
throtle body, connect vacuum
pump to the hose and apply
Connect a vacuum pump to the
MAP sensor and apply vacuum.
Does it hold vacuuml
Repair vscuum lsak in hoa€ rout-
ing betwaon MAP asn3or lnd
rhrottlo body .
Connect a T-titling from a vacu-
um gauge between the throttle
body and #21 hose.
{ T o p a g e 1 1 - 6 9 }