F-body DTC's on a T56 1996 Impala SS
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F-body DTC's on a T56 1996 Impala SS
Hi All,
Ever since the T56 install, the A/C compressor has a knack for cutting out when I'l clutching my way through 1st and 2nd gear in traffic. Here's what happens (to the best that I can nail it down):
If I start the car and turn on the A/C, it comes on.
If I start driving in city driving with stoplights and traffic and/or parking lots, eventually, the compressor will shut off..usually when I am clutching in and out in 1st gear If I start the car, don't turn on the A/C, get on the highway, then turn it on, it usually comes on OK and stays on until I start the low gear clutch tapdance again.
Today on the way home from work, I was on the freeway doing about 50 when I turned it on for the first time since starting the car and it didn't come on. I then waiting a few miles (still doing 50 or so) and turned it on again.. this time, it came on and stayed on for a while (even down to 2nd gear or so) untilI came to a dead stop in rush hour traffic...then as I was clutching my way in the traffic, it shut off.
Something about low RPM's and that "almost stalling it in 1st gear" low rpm take-off that causes it to cut out.
There are three DTC codes in the PCM.
P1532 A/C Evaporator Temperature sensor circuit low voltage
P1533 A/C Evaporator Temperature sensor circuit high voltage
P1543 A/C system performance
Now, these codes were in the PCM before we redid the ground wire on the PCM (F-body tuning), so I'm not sure which ones are still popping up.
I have no clue what is causing these codes and this problem with the A/C, but I'd like to get to the bottom of it.
I haven't yet checked the wiring other than the ground wire from the PCM. So I'm not ruling out the possibility of a short somewhere in the circuit.
None of these problems were present before the T56, so I'm inclined to think it's th ground wire, but I just don't know as the A/C *does* work from time to time as described above.
Could it be the A/C pump itself? The freon level is OK (almost on the verge of low, but still OK). I have an underdrive pulley on the crank (and a new overdrive pulley for the alternator en route).
Any help on this would be greatly appreciated.
Thanks,
--Basim
Ever since the T56 install, the A/C compressor has a knack for cutting out when I'l clutching my way through 1st and 2nd gear in traffic. Here's what happens (to the best that I can nail it down):
If I start the car and turn on the A/C, it comes on.
If I start driving in city driving with stoplights and traffic and/or parking lots, eventually, the compressor will shut off..usually when I am clutching in and out in 1st gear If I start the car, don't turn on the A/C, get on the highway, then turn it on, it usually comes on OK and stays on until I start the low gear clutch tapdance again.
Today on the way home from work, I was on the freeway doing about 50 when I turned it on for the first time since starting the car and it didn't come on. I then waiting a few miles (still doing 50 or so) and turned it on again.. this time, it came on and stayed on for a while (even down to 2nd gear or so) untilI came to a dead stop in rush hour traffic...then as I was clutching my way in the traffic, it shut off.
Something about low RPM's and that "almost stalling it in 1st gear" low rpm take-off that causes it to cut out.
There are three DTC codes in the PCM.
P1532 A/C Evaporator Temperature sensor circuit low voltage
P1533 A/C Evaporator Temperature sensor circuit high voltage
P1543 A/C system performance
Now, these codes were in the PCM before we redid the ground wire on the PCM (F-body tuning), so I'm not sure which ones are still popping up.
I have no clue what is causing these codes and this problem with the A/C, but I'd like to get to the bottom of it.
I haven't yet checked the wiring other than the ground wire from the PCM. So I'm not ruling out the possibility of a short somewhere in the circuit.
None of these problems were present before the T56, so I'm inclined to think it's th ground wire, but I just don't know as the A/C *does* work from time to time as described above.
Could it be the A/C pump itself? The freon level is OK (almost on the verge of low, but still OK). I have an underdrive pulley on the crank (and a new overdrive pulley for the alternator en route).
Any help on this would be greatly appreciated.
Thanks,
--Basim
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