Troubleshooting Flowchart - Vehicle Speed Sensor (Vss) - Honda Prelude 1993 Service Manual

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PGM-FI System
Troubleshooting Flowchart - Vehicle Speed Sensor (VSSI
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The Maltunction Indicator Lamp (MlL) indicates Diagnostic Trouble Cod€ (DTC) 1 7: A problem in the
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vehicle speed sensor {vss) circuit.
The VSS generates a pulsing signal when the front wheels turn.
@emr
ro.l wheel beloro
jacking up front ot
cat,
o o o o o o o o o o o o o I o o o o o o o o & r u f f i o o o o o o o o o o o
o o o o o o o o o o o o o I o o o o o o o o E E w r y l o o o o o o o o o o o
A 2 6 l - )
8 1 0 ( + )
O - 1 2 v
ot O *5.o v?
NOTE: Transmission in @ position {A/T).
( T o p a g e 1 1 - 8 3 )
- Th6 MIL has bo6n r€portod on.
- With sorvico ch6ck connoctor
iumped ls6o page I 142), cod€
'17 is indicatod.
Do the ECM Res€t Procedure (see
p a g e 1 1 - 4 3 ) .
Road test necessary.
With manual transmission in 2nd
gear (A/T: E position) accelerate
to 4,000 rpm, th€n decelerate to
1,5OO rpm with throttle tully
croseo.
Intormlttont lallurc, 3ystcm ls OK
at this tim€.
Chock tor Door connoctiona ol
loose wir6s at C433 {locrtod at
.ight shock tow6.). Cl15 {VSSI
and ECM,
ls the MIL on and does it
indicate code 17?
Block rear wheels and set the
parking brake. Jack up the front
oI the car and support with sale-
ty stands.
Turn the ignition swilch OFF.
Connectthe test harness between
the ECM and connectors (see
p a g e 1 1 - 4 5 ) .
Turn the ignition switch ON.
Block the right front wheel and
slowly rotate left lront wheel and
measure voltage between B1O
{ + } t e r m i n a l a n d A 2 6 { - )
Iermrnat.
Does voltage pulse 0 V and
'12 V
lH22A1 engine {USA: Si
VT€C/Canada: SR'V) 5.0 V)?
Turn the ignition switch OFF.
Substituto a known-good ECM
and rochock, lf symptom/indica-
tion gooa away, roplaco th6 origi-
nal ECM.
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