Need help with tachometer and OBD II Code P0725

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Nov 14, 2005 | 11:08 AM

mexcook

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Joined: Nov 2005

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From: Houston, Texas, USA

Need help with tachometer and OBD II Code P0725

I have a 96 Accord V6 and the tachometer works when I start the car but eventualy stops working after a few minutes. Has anyone ever encounterd this problem? My check engin light is also on with a OBD II Diagnostic Trouble Code P0725 (Engine Speed input Circuit Malfunction or Engine Speed Sensor Circuit Malfunction). Could this be related to the tachometer? I just had transmission work done and the guy says that the problem is related to the rotor, not the speed censor. Someone please help

Nov 14, 2005 | 01:30 PM

P_Adams

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Joined: Jan 2004

Posts: 6,456

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From: New England, USA

Re: Need help with tachometer and OBD II Code P0725 (mexcook)

P0725 is..... guess what? "Engine Speed Input Circuit Malfunction"
Which effects.... what? ECM (sets a code) AND Tachometer !!!!!

You've lost the tach RPM signal.

P

Nov 14, 2005 | 03:26 PM

Chiovnidca

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Joined: Apr 2002

Posts: 7,574

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From: Cincinnati,, Oh

Re: Need help with tachometer and OBD II Code P0725 (mexcook)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mexcook »</TD></TR><TR><TD CLASS="quote">I have a 96 Accord V6 and the tachometer works when I start the car but eventualy stops working after a few minutes. Has anyone ever encounterd this problem? My check engin light is also on with a OBD II Diagnostic Trouble Code P0725 </TD></TR></TABLE>
Probably has a bad ignition coil. They have an internal resistor that the tcm uses to drive the tach.

Jun 18, 2009 | 01:05 PM

gus738

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Joined: Sep 2006

Posts: 769

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From: sc area ca, USA

Re: Need help with tachometer and OBD II Code P0725

Sorry for waking up an old thread but i too have my rpm and my speedometor going crazy and pulled p0725 or pO725? speed sensor, and i was sure of it until i started to hear about igniation coil?

both a trusted mec and a master SA in honda said its the sensor based on the information i've given them. (asked 2 different times)