Engine/Transmission (1994 - 1998) No Tack Gen. Light On

[rchilders]

Could Use Some Help , First Thing Noticed Truck Wouldn't Shift Into Od,then Tack Wasn't Working ,then Charge Generator Light Comes On Amp Gauge Slowly Drops, Also Any Place To Get Battery Cables Beside S Dealer,all Help Apreciated.



97 2500 Auto 4x4 4in Exhaust 112. 000 Mi

 

[wildmanben]

Check your RPM sensor on the crank. The symptoms you describe are quite fitting of this probem.

 

[DamonL]

Ditto. same problem happened to me.

 

[rchilders]

Hi thanks for the info havn't had time to look into the problem yet ,do you know a way i can check out to make sure the senser is bad before i purchase one and if after market products work ok 'TAHNKS

 

[rchilders]

Hello Do You Happen To Know About The Voltage On The Sensor I Have 5 Volts On The Outside Terminals 0 On The Center Wire With The Ignition On Any Info Appreciated

 

[K5IP]

The 5VDC is the reference voltage from the pcm. This sounds right. One line should go to ground. The third line, the output line should switch between o and 5 VDC each time the notch in the damper passes the sensor. You can observe this output with a voltmeter by disconnecting the fuel shutdown valve connection (so the engine does not start), and then cranking the engine over with the starter, This is obvously a two person operation.

Sorry I don't have my manual with me for color codes.

 

[Flinty]

Does the wait to start light come on when you turn the key? If not, unplug sensor then try. Light on, sensor bad. Still no light, look at the PCM and related wiring starting cheap and working your way to most expensive(PCM). Luck,Jon.

 

[Missouri Mule]

Try cleaning connector and checking for loose or broken pins in the connector to the Engine speed sensor (rpm sensor, crank speed sensor) before replacing it.

Check to make sure gap is correct (4-5, business cards).

 

[K5IP]

Good point about the connector.

I have to keep mine held together with a nylon tye lock. Also the gap is important.

As previously pointed out on the site, the main reason these things (hall effect switch) fail is because the magnetic field decreases with age. The gap is supposed to be . 050" but a credit card (about . 030) will sometimes make up for the lost field.

Rog

 

[rchilders]

Hi Yes The Wait To Start Light Comes On ,when You First Start Up The Tack Does Not Work Volt Gauge Shows Not Charging Take 4or5 Minuts The Gen Light Comes On ,ordered Sensor Going To Put That On And Hope For The Best Let You Know How It Goes ,thanks For All The Help ,this Site Is Great Well Worth It

 

[rchilders]

O Buy The Way I Checked The Gape On The Sensor And I Could'nt Even Get A Credit Card In There

 

[Bobcat698]

Replace the sensor. That will fix it.

 

[rchilders]

Well Put On The Crank Sensor Today Started It Up Same Thing ,well Any After Looking Around And Wigiling Wires And Conecttors Will Running Found Loose Conection At Pcm ,/relieved And Thankfull Had Me Worried Deer Season Starts This Weekend Could'nt Miss That . Thanks For The Info