So my car started running abnormally rich after installing several electrical pieces including an ECU, a engine harness, and a CHTS. I checked connections, then ran the codes. The code for CHTS came up. I pulled the CHTS and subharness and tested them as described in the 84 FSM on EF & EC-46. A fluke multimeter was used to measure resistance, and a craftsmen multimeter to measure temperature.
When the water reached boiling, i dropped in the CHTS and both probes. Neither the probes or the CHTS were touching the pan. The water was held at the temperature points for long enough for the resistance measurement reading to stabilize, which usually took 10-20 seconds. Temperature is measured in Farenheit, and resistance is measure in ohms.
Actual Results
212*=175
176*=288
122*=695
68*=1860
These measurements are all close to FSM specifications.
FSM Specs
212*=180-200
176*=260-390
122*=680-1000
68*=2100-2900
While 3 of my test results are in range, they are all on the low side. The data point for 68* is lower than the specified range. How close do these measurements have to be?
So what do you think? Are these resistance measurements close enough to factory specs? Is this CHTS and Subharness bad, or is the problem elsewhere in wiring harness? As i mentioned before, I just installed a different engine wiring harnes that i had trimmed back (non-existent emissions equipment and others) and re-loomedfor a cleaner look. Tomorrow, provided you all think that my CHTS is fine, I will reinstall it and test the engine harness at the 16 pin ECU connector as described in the FSM on page EF & EC-46.
Thanks
-Mike
When the water reached boiling, i dropped in the CHTS and both probes. Neither the probes or the CHTS were touching the pan. The water was held at the temperature points for long enough for the resistance measurement reading to stabilize, which usually took 10-20 seconds. Temperature is measured in Farenheit, and resistance is measure in ohms.
Actual Results
212*=175
176*=288
122*=695
68*=1860
These measurements are all close to FSM specifications.
FSM Specs
212*=180-200
176*=260-390
122*=680-1000
68*=2100-2900
While 3 of my test results are in range, they are all on the low side. The data point for 68* is lower than the specified range. How close do these measurements have to be?
So what do you think? Are these resistance measurements close enough to factory specs? Is this CHTS and Subharness bad, or is the problem elsewhere in wiring harness? As i mentioned before, I just installed a different engine wiring harnes that i had trimmed back (non-existent emissions equipment and others) and re-loomedfor a cleaner look. Tomorrow, provided you all think that my CHTS is fine, I will reinstall it and test the engine harness at the 16 pin ECU connector as described in the FSM on page EF & EC-46.
Thanks
-Mike
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