Temperature gauge problem

49ERS82

MEMBER
1999 HONDA ACCORD

Four cylinder front wheel drive automatic 94,245 miles.

i have a question, my car's gauge all ways go to high temperature even when is cold. In the mornings when I turn on the car the needle on the temperature goes to high in ten seconds and will not go down any more. But the car runs great. The fans turn on normality. Can you help me what is going on please? My name is Joshua.

5 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi Joshua,

Either the gauge is faulty or the sending unit or its wiring is shorted.

Unplug the sending unit wire and check if the gauge stilll goes to maximum.

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Friday, May 28th, 2010 AT 11:25 AM

49ERS82

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3 POSTS

Can you please tell more information? Which is the wire that you are talking about? Can you let me know were is located so I can unplug? Thank you.

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Saturday, May 29th, 2010 AT 6:39 PM

KHLOW2008

MECHANIC
41,814 POSTS

The wire is plugged into the sending unit located at end of cylinder head.

It is somewhere below the distributor, a single wire connector.

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Sunday, May 30th, 2010 AT 8:51 AM

49ERS82

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3 POSTS

Hey there thank you for telling me. I unplug the wire to told me, but when I do that the gauge goes all the way down to cold and if I plug it back it will go all the way back to high. Can you tell me more information please? Thank you.

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Tuesday, June 8th, 2010 AT 2:23 PM

KHLOW2008

MECHANIC
41,814 POSTS

Try the following test to see if you can come up with anything.

Coolant Temperature Gauge Needle Goes Past Hot Mark (Four Cylinder)

1. Turn ignition off. Disconnect ECM/PCM 31-pin connector "C". Turn ignition on. Observe coolant temperature gauge for at least 30 seconds. If coolant temperature gauge needle moves at all, go to next step. If coolant temperature gauge needle does not move, replace ECM/PCM with known-good ECM/PCM and retest gauge operation.

2. Turn ignition off, then turn ignition on again. Observe coolant temperature gauge. If coolant temperature gauge takes less than 30 seconds to go past hot mark, replace fuel and temperature gauge assembly. If coolant temperature gauge takes 30 seconds or more to go past hot mark, go to next step.

3. Turn ignition off. Pull out instrument cluster. Disconnect instrument cluster 16-pin connector "C". Check continuity between ground and ECM/PCM connector "C" terminal No. 24 (Yellow/Green wire). See Fig. 14. If continuity exists, repair short to ground in Yellow/Green wire between ECM/PCM and instrument cluster. If continuity does not exist,
replace fuel and temperature gauge assembly.