Honda Prelude 1993 Service Manual page 330

PGM-FI System
Troubleshooting Flowchan - Knock Sensor (KSl [Except F22A1 engine(S]l -
t-7=.l- -r#-
The Malfunction Indicator Lamp (MlL) indicates Diagnostic Trouble Code (DTC) 23: A problem in
_lltlllll-
-l .l l-
the Knock Sensor (KS) circuit.
-e-tm-
o3
t_
-
Continuity?
- Thc MlLhas boen roponed on.
- With !6wico chack connoctol
lump€d l..o pago I 1421, codo
23 is indicatod.
Do tho ECM Res€t Procedurs ls€e
p a g e 1 1 - 4 3 ) .
Warm up the sngine to normsl
opgrating tempotature (tho radia-
tor lan comgs on).
Hold engine 8t 3,OOo - 4,0OO rpm
tor 1O seconds with manualtrans-
miesion in neutral {A/T: lll or lq
position).
Int.mittonl
l.llur., sy.t.m b OK
at thir tim. (tod driv. maY bo
nocolaorYl.
Chack for poot conncctlon!
ot
loolq wlro3 al O+32 (loortrd rt
right shod( tow.r), Cl l2lKS) and
ECM,
ls the MIL on and does it
indicats code 23?
Turn the ignition swirch OFF.
Connect the test harness to the
engine wire harneas only, not to
the ECM (see page 1 1-45),
Ch6ck lor continuity between D3
t€rminal and body ground.
Rop6ir.hon in RED/BLU wite bc-
trY.en ECM lD3l snd th. KS.
(To page 11-89)
1 1-88