Pyro troubleshooting - Competition Diesel.Com

kxhonda · 09-16-2009, 11:24 PM

My pyro has stopped working on my isspro gauges and I'm trying to track down the problem before I buy a new thermocoupler. Can I test the thermocoupler with an ohmmeter to see if its still good? And what value should I be seeing?
Thanks
Eric

*Michael* · 09-29-2009, 04:06 PM

Sorry, I missed seeing this thread. The thermocouple generates a very small voltage in proportion to the difference in temperature from its tip to the end of the leadwire. You need a digital voltmeter with a millivolt range on it to read the value. With the engine idling (exhaust gas temperature approximately 300°F) and the end of the leadwire in the vehicle interior at approximately 70°F, you should measure approximately 5.28 millivolts.

Regards,
Michael Pliska

bmoeller · 10-04-2009, 04:06 PM

Does your gauge have an amplifier box?

Check for a loose connection at the box if you do.

09-16-2009, 11:24 PM	#1
kxhonda Name: kxhonda Title: Too Much Time Status: Not Here Join Date: Feb 2007 Location: Warsaw, IN Member`s Gallery Posts: 393	Pyro troubleshooting My pyro has stopped working on my isspro gauges and I'm trying to track down the problem before I buy a new thermocoupler. Can I test the thermocoupler with an ohmmeter to see if its still good? And what value should I be seeing? Thanks Eric __________________ Eric Beverly 1999 3500 Ext. Cab, 5spd, 13mm pump, 6x16's, A1000

09-29-2009, 04:06 PM	#2
Michael Name: Michael Title: Comp Diesel Sponsor Status: Not Here Join Date: Apr 2006 Location: Happy Valley, OR Member`s Gallery Posts: 3,411	Sorry, I missed seeing this thread. The thermocouple generates a very small voltage in proportion to the difference in temperature from its tip to the end of the leadwire. You need a digital voltmeter with a millivolt range on it to read the value. With the engine idling (exhaust gas temperature approximately 300°F) and the end of the leadwire in the vehicle interior at approximately 70°F, you should measure approximately 5.28 millivolts. Regards, Michael Pliska __________________ ISSPRO Engineering Manager Under Construction: 1999 Chevy Pro Stock Diesel Pickup LBZ, GT4202R over GT5541R, sponsored by ISSPRO and Chris Alston's Chassisworks 95 F350 CC DRW, Intake, exhaust, chip, injectors, locker, gauges 00 Jetta TDI - tunes, clutch & gauges And a bunch of gassers

10-04-2009, 04:06 PM	#3
bmoeller Name: bmoeller Title: Too Much Time Status: Not Here Join Date: Jun 2007 Location: NW IL Member`s Gallery Posts: 329	Does your gauge have an amplifier box? Check for a loose connection at the box if you do. __________________ Building- '82 W350 crew dually. '93 CTD, 5600, 205, D60/D80, BOMBED '93 W350, 5spd, Kelderman single bag, 1/8" timing bump, rotated stock pin. Sold- '92 W250 - '97 3500 CTD BOMBed - '99 3500, Q/C, 4x4, CTD, 5spd