Question about Hyundai Motor 1991 Scoupe

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1991 hyundai scoupe codes

WHAT ARE THE CODES 21 & 24? AND HOW SHOULD REPAIR?

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Hi
code 21 (ECT) ENGINE COOLANT TEMPERATURE SENSOR
harness and connector OR (ECT) sensor
code 24 (VSS) VEHICLE SPEED SENSOR ]
harness and connector OR (VSS) sensor

WITH MY BEST WISHES

Posted on Jul 03, 2008

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1991 hyundai scoupe; engine cranks but does not start, check engine light came on then off about three times before this occurred. Car has fuel, checked injectors, fuel pump, plugs, rotar. think it might...


You stated the 'CHECK ENGINE' light came 'ON'!... what/which DTC'S (Diagnostic Trouble Codes) OBDI were retrieved? In 1991, OBDI (1) was used. You could retrieve codes by either turning the ignition switch on/off two or three time within 3 seconds and the light would flash for each number (this way you could determine which system was affected). The POSSIBLE CAUSES are many:

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Ignition Coils/Wires
Water/contaminated fuel
Electrical (Relay(s), fuse(s), Poor ground connections, failed ECU (Engine Control Unit), etc.

Are you getting a SPARK to the plugs?... if so, check fuel pump pressure
If you're not getting a spark to the plugs or not getting a fuel injector PULSE, then the crank position sensor MIGHT BE the problem.... NOT SURE!

Too many POSSIBLE or PROBABLE causes.

In order for an engine to RUN, it needs these things:

1. Air flow (intake AND exhaust)
2. Fuel (proper fuel to air mixture)
3. Compression (140 to 2?? psi)
4. Proper Timing (not too advanced/retarded)
5. Ignition (sufficient and at the correct/right time)

Now, after listing these 5 things, without CHECKING each one, your guess is a good as mine.

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Mar 29, 2009 | Hyundai Motor 1991 Scoupe

1 Answer

Codes 21 & 24


HI
the (ECT)coolant temp sensor have two wire and you can test it by (AVO meter) the two wire :-
the 1st is ground from ECM
the 2nd is have 5 volt whine disconnect the connector
of (ECT) and less then whine connected the (ECT)
the (ECT)was electronic thermo resistor
the one wire sensor work to coolant temp gage in dashboard

the (VSS) locate in trans axle it was electromagnetic sensor send signal to determine the distance in (KILOMETER)

with my best wishes

Jul 03, 2008 | Hyundai Motor 1991 Scoupe

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