code 6 on stock 88 CRX DX

[Louse76]

Hey guys, now and then the check engine comes on on my girlfriend's crx. The car runs perfectly fine so we never thought much of it, that it was just age. My friend showed me how easy it was to read the light last night while we were driving around, I didn't see, but he said he believes it was a code 6 which reads: Engine Coolant Temp circuit Reading too low or too high, open or short in circuit, defective ECT circuit What do I need to look into to diagnose and fix this problem? Her temp gauge does tend to stay very low for a while until the car is really warmed up, but I attributed that to having the small engine with a much bigger and metal radiator than the other d16-ified civics... Any help very much appreciated thanks!

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[Louse76]

Also now and then recieving code 7 and 16 (or was it 17?). Any help?

[Kai]

6 - Coolant temperature (sensor)
7 - Throttle angle (TPS, throttle position sensor)
16 - Fuel injector
17 - Vehicle speed sensor