Troubleshooting Flowchart - Tdc/Ckp/Cyp Sensor - Honda Prelude 1993 Service Manual

PGM-FI System
Troubleshooting Flowchart - TDC/CKP/CYP Sensor
The Malfunction Indicator Lamp (MlL) indicates Diagnostic Trouble Code (DTC) 4: A problem in the
Crankshaft Position (CKP) Sensor ci,cuit.
The Maltunction Indicator Lamp (MlL) indicates Diagnostic Ttouble Code {DTC) 8: A problem in rhe
Top Dead Center (TDC) Sensor circuit.
The fiilalfunction Indicator Lamp (MlL) indicates Diagnostic Trouble Code (DTC) 9: A problem in the
Cvlinder Position (CYP) Sensor circuit.
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The CKP Sensor determines timing fo. fuel injection and ignition of each cylinder and also detects engine speed. The
TDC Sensor determines ignition timing at start-up (cranking) and when crank angle is abnormal. The CYP Sensor detects
the position of No. I cylinder for sequential fuel injection to each cYlindet.
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- Tho MIL ha. b€€n Jooortod on.
- lilfith loruice ch€ck conn.ctol
iump€d (3oo prgo 1 1 42), codc
4. 8 rnd/or 9 aro indicstgd.
Do the ECM Reset procedure lsee
pago 1 1-43).
l ormittont l.ilur., syltom b OK
at this timo ltelt driv6 may bo
neco$aryl.
Chock for Door connoctiona or
loos6 wir.s at Al25 (locatod at
dght shock towo.), Cl25 (TDC/
CKP/CYP ionsorl .nd ECM.
ls lhe MIL on and does it indi
cate code 4. 8 and/or 9?
Turn the ignition switch OFF.
Disconnect the 8P conn€ctor from
the TDC/CKP/CYP sensor.
( T o p a g e 1 1 - 7 1 )