Question about Cars & Trucks

1 Answer

Voltage fluctuation appears on digital display and erratic output

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

  • Cars & Trucks Expert
  • 244 Answers

More info please

Posted on Apr 28, 2015

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Where is the tcr sensor? code c140f


04 GC
TCR?
easter egg hunt 1000
clear the code with any scan tool, if it comes back, it real
do that yet (as we do with all DTCs on all cars?)

so dash cluster showed, C140F, right?, not a real scan tool
not autozoned? scanned.?
if not fully scanned, how would you know there are 5 more DTC's
and that be very important.
why is last, tests are next unless gue$$ is the game.
and you wonder why?

MY FSM BOOK shows.
C140F-TRANSFER CASE RANGE POSITION SENSOR ERRATIC PERFORMANCE

this is pretty clear, and the steps to test it is in the same book.
quotes. (part)
The Final Drive Control Module detects excessive voltage fluctuation on the Mode Sensor Signal circuit.
quote
2. (T504) DRIVETRAIN 5 VOLT SUPPLY VOLTAGE ERRATIC
NOTE: This DTC sets when the Final Drive Control Module
detects excessive voltage fluctuation on the Mode Sensor Signal
circuit. Perform a thorough inspection of all wiring and connectors
between the sensor and the control module.
Turn the ignition off.
Disconnect the Transfer Case Motor harness connector.
Turn the ignition on.
Measure the voltage of the (T504) Drivetrain 5 Volt Supply circuit.
NOTE: Voltage should be approximately 5.0 volts and steady.
Compare any slight fluctuations found to a known good circuit in
order to verify voltmeter functionality.
Is the voltage approximately 5.0 volts and steady?
Yes >> Go to 6
No >> Go to 3
end, quote (partial)

14 checks above is 1st.
got a voltmeter
no the buy a new swtich.
checked all 4 + fuses related to this?

the plug is on the transfer case.

here it is.


25503619-tk5pw0guzkbs2wb12fwiwrb2-5-0.jpg

Mar 02, 2015 | 2004 Jeep Grand Cherokee

Tip

3.1b) How to check and fix crankshaft position sensors How to check? If the...


<p><b><span>3.1b) How to check and fix crankshaft position sensors</span></b><br /> <p><b><span><br /></span></b><br /> <p><b><span>How to check?</span></b><span> If the CKP has died completely there will be very high resistance between the device's electrical connections associated with the open circuit. Furthermore spark delivery to the plugs will be absent. First check that the electrical connection is clean and secure; dirt or corrosion can impair an otherwise healthy CKP signal from getting through.<span> </span>If the CKP suffers from a drop in voltage associated with heat increase this can only be detectable with a voltmeter or oscilloscope with a graphical display; an analogue display voltmeter might just be able to show needle fluctuations due to voltage variation output.</span><br /> <p><span> </span><br /> <p><span><span> </span>2 pin socket (magnetic - sine wave output).<span> </span>One pin is 'ground' the other is 'signal'.<span> </span>A voltmeter set to 2 volts AC should measure a signal in the 0.2 to 2 volts range on the 'signal' pin.</span><br /> <p><span><span> </span>3 pin socket (Hall effect, magneto - square wave form output).One pin is 'reference' (5volts), one pin is 'ground' and the third pin is 'signal'.<span> </span>A DC voltage should be detectable in the 0.5 to 1.5 volt range from the 'signal' pin.</span><br /> <p><span><span> </span>It is important that the voltage measurement take place at start up when the engine is cold and again, 20 minutes later, when the engine has fully warmed up to operating temperature. Often the voltage output from faulty sensors declines with temperature rise.</span><br /> <p><span><span> </span></span><br /> <p><b><span>How to fix?</span></b><span><span> </span>Check the wiring for continuity and that the electrical connection is clean and secure. Remove the CKP and clean off any dirt build up on the tip.</span><br /> <p><span>If you strongly suspect the crank sensor as being at fault it is a relatively inexpensive device to replace.</span><br /> <p><span><br /></span><br /> <p><span><b>NEXT 3.2) CMP - Cam shaft position sensor</b></span><br /> <p><br /><br /> <span><br /></span>

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

I have a 2000 honda civic dx 1.6l and when i drive down the road and come to a stop all my dash lights and head lights flicker


Sounds like a bad diode in the voltage regulator. This will cause fluctuations in the DC voltage. The faster the engine goes, to less noticeable the fluctuations will appear. Have the alternator/regulator checked and serviced as necessary.

Sep 07, 2014 | Cars & Trucks

1 Answer

2007 Mahindra Scorpio has an erratic rev counter and battery light


check the condition and tension of the drive belt. Check that the battery terminals and posts are shiny clean and tight. Have the battery load tested for faulty cells. Have the alternator tested for output

Apr 04, 2014 | 2007 Mahindra Scorpio 2.6TD

1 Answer

2007 chrysler aspen at idle, rpm's fluctuate erraticly.why?


You probably have a bad throttle position sensor.

Sep 20, 2012 | 2007 Chrysler Aspen 4x2

1 Answer

Chevrolet suburban voltage gauge fluctuates


The rough running is the cause of the voltage gauge movement.. As the engine speed increases and decreases the voltage output of the alternator goes up and down. So the gauge is a symptom not a problem.

Feb 14, 2012 | 1994 Chevrolet Suburban

1 Answer

M B A class X reg 85000miles engine kept cutting out leaving esp/baslight on airmass meter fault diagnosed ECU sent to ECU Testing ltd Notts new airmass meter fitted ecu checked atsame time car still...


I would look at the crank position (CKP) sensor, its connection and wiring continuity.

Where is it located? the crank sensor is located on the 'back' of the engine on the edge of the flywheel housing above the starter motor mounting.

A common symptom is Hesitant acceleration, acceleration ceiling - Miss-timed ignition due to a faulty CKP signal can be exacerbated by increased engine speed. The engine maybe run evenly at idle but will fail to accelerate properly at higher revs until the engine reaches a power ceiling
How to check? Often the voltage output from faulty CKP sensors declines with temperature rise so a car that seems to be fine initially can become erratic after 20 minutes. If the CKP has died completely there will be very high resistance between the device's electrical connections = open circuit. Furthermore spark delivery to the plugs will be absent. First check that the electrical connection is clean and secure; dirt or corrosion can impair an otherwise healthy CKP signal from getting through. If the CKP suffers from a drop in voltage associated with heat increase this can only be detectable with a voltmeter or oscilloscope with a graphical display; an analogue display voltmeter might just be able to show needle fluctuations due to voltage variation output.

2 pin socket (magnetic - sine wave output). One pin is 'ground' the other is 'signal'. A voltmeter set to 2 volts AC should measure a signal in the 0.2 to 2 volts range on the 'signal' pin.

3 pin socket (Hall effect, magneto - square wave form output). One pin is 'reference' (5volts), one pin is 'ground' and the third pin is 'signal'. A DC voltage should be detectable in the 0.5 to 1.5 volt range from the 'signal' pin.



It is important that the voltage measurement take place at start up when the engine is cold and again, 20 minutes later, when the engine has fully warmed up to operating temperature.


How to fix? Check the wiring for continuity and that the electrical connection is clean and secure. Remove the CKP and clean off any dirt build up on the tip.
If you strongly suspect the crank sensor as being at fault it is a relatively inexpensive device to replace.

Nov 30, 2010 | 2006 Mercedes-Benz ML-Class

1 Answer

99 Chrysler sebring conv. driving or sitting at light car stalls out dies, wait 3 to 5 minutes starts up but will die again sometimes in a few miles sometimes not. Have had fuel filter, fuel pump, rotar,...


The crankshaft sensor would fit with the symptoms. Often the voltage output from faulty sensors declines with temperature rise so the temperature at which your CKP was checked over is critical. How to check? First check that the electrical connection is clean and secure; dirt or corrosion can impair an otherwise healthy CKP signal from getting through. If the CKP suffers from a drop in voltage associated with heat increase this can only be detectable with a voltmeter or oscilloscope with a graphical display; an analogue display voltmeter might just be able to show needle fluctuations due to voltage variation output. There are two types of CKP:-

2 pin socket (magnetic - sine wave output). One pin is 'ground' the other is 'signal'. A voltmeter set to 2 volts AC (note well) should measure a signal in the 0.2 to 2 volts range on the 'signal' pin.

3 pin socket (Hall effect, magneto - square wave form output). One pin is 'reference' (5volts), one pin is 'ground' and the third pin is 'signal'. A DC voltage (again note well) should be detectable in the 0.5 to 1.5 volt range from the 'signal' pin.

It is important that the voltage measurement take place at start up when the engine is cold and again, 20 minutes later, when the engine has fully warmed up to operating temperature. If there is a marked decline in voltage output between hot and cold, replace the CKP. If all looks well apply this diagnostic to the cam position sensor CMP (it works in exactly the same way)

Nov 15, 2010 | Chrysler Sebring Cars & Trucks

1 Answer

Erratic Flickering of all electric devices (headlights, dashlights, AC)


Did you use a Delco rebuilt Alternator? The ones you get from so called discount auto parts stores are junk and they may be the cause of this problem, monitor the output of the system with a DVOM meter, does the voltage fluctuate? Have you check all the chassis grounds? They are the biggest source of this type of issue when the Alt. is ruled out.

Apr 21, 2017 | 2000 Chevrolet Lumina

1 Answer

Car is not breathing correctly


The throttle sensor is on the side of throttle body opposite the throttle cable from otherside. If you can use the scanner to read the voltage with key on, slowly depress accelerator and watch for any erratic voltage jump. You may also want to check vehicle speed sensor reading with the scanner while some else is driving. Erratic voltage/signal reading from this sensor can make the vehicle buck and surge also.

Mar 22, 2009 | 1997 Dodge Dakota

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

13 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76649 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...