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What setting do i use to read 73 ohms? - CJ5 Jeep Cars & Trucks

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  • Richard Scordino Mar 12, 2011

    Use the next highest setting above 73.

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  • Master
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I guess you are using a multimeter. Set the meter to 0 on the ohms adjust. Then set the meter to 1 to 100 ohms.

Posted on Mar 13, 2011

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2003 f450 v10 6.8l wont start after sitting overnight


The difficulty factor of not being there coupled with the absence of a trouble code is high...One possible cause is a defective coolant temperature sensor which is falsely telling the PCM that the temperature is too high...See diagram below location of CTS (coolant temperature sensor) disconnect connector...set ohm meter on X10 scale (you are looking to read 6000 ohms)...place probes on sensor leads not connector...At outdoor temp of 70-80 degrees meter must read about 5400 ohms...If it reads 1100 ohms or less sensor is defective...test two; measure from top of negative battery terminal, with meter set the same, place other lead first on bare metal of fender;READ...Then on bare metal of engine; READ...Both readings must be less than 50 ohms...If meter reads high (1000-2000) ohms you have found the fault...Install braided ground straps from - batt to chassis and block...Let me know the results of these two basic tests...

  1. Engine coolant temperature sensor (ECT).
  1. Intake manifold air control valve assembly.
  1. Camshaft position sensor (CMP).

saailer

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What is the easiest way to diagnose a nissan 3.3 eng. Injector, on a road trip just a few tools available.


You need a volt/ohm meter to check the injectors. The injector should ohm out between 11 and 15 ohms(leads on both ends of the injector). Set the meter to the lowest ohm reading. On the plug end you should have a jumping reading, when cranking the engine, set it to dc volts.. It never gets to 0 volts or 12 volts, Just jumps between them. If you have no voltage from the plug end, then the wire is broke. Usually by the plug. Set it back to ohms and check the plug and pierce the wire about 3 inches back. See if you get a reading. Should be close to 0 or .05 ohms. If not, fix the wire. You may have to go further down on the wire. You can get a cheap ($20) meter at any parts store.

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How do i check the crankshaft position sensor?


Connect a VOM to the wires set to AC volts. Crank the engine over, and it should read 0.2 to 2 VAC. Set the meter on ohms, and the meter should read 200 to 500 ohms between the terminals.

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1 Answer

How to fix fuel guage


ZJ
what does it do now? stuck high, low. ,read off a bit. ? or what?
the tests are easy.
covered in the FSM 100% ( in a bad way)
see that here in chapter,called, "instrument panel"
chapter 8E.
page 5
as you can see the gauge is digital (CCD)
and the PCM (engine controller) sends fuel data to the gage via
the CDD data bus.
so the sender , may be telling the PCM wrong information.
I'd start there.
if your read page 5 it tells you the PCM sends, Empty stop data
to the gauge when the sender messes up.? DID YOURS?
does your low fuel warning lamp still work?
if not, that is clue 2 that the sender is BAD. if dead lamp.

that means sender bad, or wires TO it are bad, as in all cases, electrical..
In a real Jeep dealer, they use the DRB tool and read the sender
data directly and in 1 second, ahhh, it reads wrong.
then find the cause.
but us poor, sand crabs, we dont have DRB scanners.
we are not blessed.

but we are not helpless, not yet.
see the last chapter "wiring", see the fuel page. #
8w=20-3 (pdf 69)
see the sender
see the 2 wires,
see the colors. bingo.
what i do is, inplug the PCM (battery neg lug, disconneted)
the measure the resistance of the 2 wires.
DB-LG and BR-YL
PCM C2 -A4 and C1-c26

the sender is JUST a crude Rheostat (a wire wound var. resistor)
0 ohms (near is full) 100 (near is empty)]
if it reads infinity the line is bad. wires, connector all the way to the sender.

old data on older jeeps 86
73 ohms Empty 23 ohms 1/2 tank 10 ohms Full

1998
With float in up position, resistance should be 20 ohms. With float in down position, resistance should be 220 ohm
i dont have spec. on all years.
but it dont matter.
its near zero full
and near 100 to 200 empty
and infinity dead, they all wear out and go open circuit some day.
or the connector rusts 100:1 . over bad sender.
corrosion is no rare thing on cars.

1997 TJ
20 ohms - full
220 ohms - empty.

im scanning the internet finding others data.


96 GC

The same wires can be tested on the pump side to measure the resistance of the sending unit. A low resistance of 20-30 ohms would indicate a full tank and an empty tank should be around 260-300 ohms. If the sending unit resistance tests higher or open circuit the sending unit is bad.

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1 Answer

1994 Mercury Grand Marquis temp gauge reads hot


Check sending unit, Ford/Mercury put out a TSB, technical service bulletin : Article No. 95-13-2 07/03/95, on erratic temp sender units.
You troubleshoot as follows :
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  2. Connect a 10 ohm resistor between gauge lead and ground. The centerline of pointer should fall within the band around the H mark.
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How do you test a power steering pressure switch on a 93 caddy deville.My Haynes repair manual tells me to connect an ohmmeter to the terminals on the switch body,start engine,turn wheel and read the...


Hi,
OHMs readings can be taken with leads in either direction. Usually OHMs readings on a car system are taken at the 2K (2000 ohms) or 200 ohms setting on your meter.

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