Vtec Pressure Switch - Honda Prelude 1993 Service Manual

Troubleshooting Flowchart -
VTEC Pressure Switch
@'l
l2rl I Uafun"tion Indicator Lsmp {MlLl indicates Diagnostic Troubte Code
VTEC Pressure Switch circuit.
r.-l f-;;r
!r{=r j-
-
ta I
lDfcl 221 A Droblem in the
*Ro6d Test:
Accelorgte in 2nd 96.r to on gngine spoed ovfl 6000 rpm.
Hold that engino speod for at loast two s€conds.
Repsat this test 6t lgagt thr6€ timos.
-
MIL h6 baan rcponod on.
-
Wlth ..wlca chccl corn.cior
Fmp.d {p.gr I 142). Cod. 22
l! Indlcltrd.
Do the ongine control moduls
(ECMI Bgset Procedure lpags
1 1 - 4 3 ) .
Warm up engine to normal oper-
ating temp€mtur€ lradiEtor fan
comes onr.
Do the Rood Test.'
lr tmltt
nt dura, !y!t!m
b OK
rt lhl! tlmc.
Chlck td poor conn.ctlionr ot
loota wklr
rt VTEC prct.or.
rwltch lnd EM,
Tu.n the ignition switch OFF.
Digconnoct the 2P connoctor from
th€ VTEC oressuro switch.
Chsck for continuiv bstwoen tho
2 terminals on the VTEC preasurs
switch.
Turn the ignition switch ON.
Mga6urc the voltags betw66n the
8LU/BLK wire 6nd body grolnd.
VTEC PRESSURE
{To pags 6-78)
(cont'd)