1999 Honda Civic overheating

Tiny
CHANTHY KEN
  • MEMBER
  • 1999 HONDA CIVIC
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 220,000 MILES
My car overheat whenever I drive the car on the road for about an hour nonstop. I have change the radiator, radiator cap, thermostat w/ the valve. Engine check light came on. Code P0117 Engine Temp Circuit Low Input. I also notice the car is leaking very little amount of coolant, but dont know from where. Driving in the city have no problem, but its only when I drive on the freeway for a long stretch of time. What can I check or do to see what the problem is?
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Tuesday, October 13th, 2009 AT 1:48 AM

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Tiny
BMRFIXIT
  • EXPERT
Check coolant fan operation
as it start to over heat turn heater on does that help in cooling it down?

DTC P0117: ENGINE COOLANT TEMPERATURE (ECT) SENSOR LOW VOLTAGE INPUT
1-Turn ignition on. Check ECT using scan tool. If 302 F (150 C) or more, or zero volts is indicated, go to next step. If 302 F (150 C) or more, or zero volts is not indicated, problem is intermittent. System is okay at this time. Check for poor connections or loose wires at ECT sensor and PCM connectors. See WIRING DIAGRAMS article.
2-Disconnect ECT sensor 2-pin connector. Check ECT using scan tool. If 302 F (150 C) or more, or zero volts is indicated, go to next step (D16Y5 engine with M/T), or go to step 4 (except D16Y5 engine with M/T). If 302 F (150 C) or more, or zero volts is not indicated, replace ECT sensor.
3-On D16Y5 engine with M/T, turn ignition off. Disconnect PCM 16-pin connector "D". Check for continuity between ground and ECT harness connector terminal No. 1 (Red/White wire).
If continuity exists, check for short in Red/White wire between ECT sensor and PCM 16-pin connector "D" terminal No. 2.
If continuity does not exist, substitute a known-good PCM and recheck.
If symptom or indication goes away, replace original PCM.
4-On all except D16Y5 engine with M/T, turn ignition off. Disconnect PCM 31-pin connector "C". Check for continuity between ground and ECT harness connector terminal No. 1 (Red/White wire).
If continuity exists, check for short in Red/White wire between ECT sensor and PCM 31-pin connector "C" terminal No. 26.
If continuity does not exist, substitute a known-good PCM and recheck. If symptom or indication goes away, replace original PCM.
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Tuesday, October 13th, 2009 AT 6:01 AM

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