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#16
07-18-2015, 10:23 PM
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Re: AC Compressor only works when jumped.
You replaced the sensor and the harness at the sensor......but what if there is a wiring problem closer to the PCM or at the PCM?
You don't need a scan tool to check the signal voltage....have you checked it? If ok, then you need the scan tool to see if the PCM is reading the same thing....if there is a signal problem, causing the PCM not to ground the relay, a code should be set.....Could be P, B, or U......as the guys said, the Tech II scan tool will tell you if a code is set, if there is an AC request set, and if the PCM is commanding the AC relay on..... 
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#17
07-19-2015, 10:16 AM
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Re: AC Compressor only works when jumped.
I will unhook the battery to try and clear any codes. I have not checked the signal voltage. I do not know how or where to check, or what the voltages should be.
Does the scanner have to be a tech2 or will any scanner work? I appreciate the help guys!!! I do not know much about electrical or ac. I can do everything else though. Thanks again!!!
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2004 GRAND PRIX GTP COMP G. VIN 4 : OVERKILL CUSTOM PCM, WIZAIR CAI, ZZP TRAILING ARMS, W BODY STORE LATERAL ARMS, ALL POLY/SOLID MOUNTS, STB F&R, ZZP RACE TRANS, ALT REWIRE & VOLTAGE BSTR, 180 STAT, NGK TR6, MPS with 3.4 PULLEY, PACESETTER HEADERS, 1.8 ROLLER ROCKERS, FP REWIRE,ZZP COILS/WIRES, TB SPACER, D&S ROTORS, INTERCEPTOR SCAN GAUGE, CUSTOM STAINLESS 2.5 INCH CAT BACK EXHAUST. 2004 Honda Odyssey EX-L 
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#18
07-19-2015, 10:51 AM
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Re: AC Compressor only works when jumped.
Once again- transducer input voltage is 5 volt, return signal voltage should vary according to pressure- but static pressure of 80 psi should yield a voltage near 1.0 volt- the other wire is ground- back probe the connector with it plugged into transducer to test. If you run the a/c return signal voltage should rise to 2-3 volts if working correctly.
Usually only a Tech II works for a/c codes- can't guarantee any others.
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Automotive A/C Engineer with: '99 IH 4700 Toy Hauler (2) '95 GEO Prizms both maroon '99 GMC Yukon '95 Chev 3500, 454 Dually Crew Cab- 145k miles- Wife's Camel trailer puller. '94 Astro- 370k miles '94 Firebird Formula- 5.7L 180k miles- gone- '92 Chevy Lumina Van 3.8L 264k '86 GMC S-15 - 2.8L 154k '87 Buick Park Ave . 187k '86 Buick Park Ave 3.8L 199k miles- gone '77 Chevy Vega- 2.5L 175k miles gone but not forgotten '68 Camaro 396 4 spd RS/SS -72k miles-
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