Diagnostic I have a 96 chevy cavalier 2.4 liter. I cannot get the pcm to recognize the diagnostic computer. I have used this handheld on a 96 regal so I know it will work on gm obd 2 computers. It will not even turn on when plugged into the cavalier however it works fine with a neon obd2 and the regal. Any tips to get it to work with this pcm.
Same problem. Went to 2 Autozone stores and neither could read it. We looked at every fuse in fuse box. Man said either a wiring problem between diagnostic connector and PCM or it was the PCM itself.Same problem. Went to 2 Autozone stores and neither could read it. We looked at every fuse in fuse box. Man said either a wiring problem between diagnostic connector and PCM or it was the PCM itself.
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Check your fuse panel for a fuse panel. You are probably not getting power to your diagnostics port on your vehicle. I do not remember which fuse the port is under but just look for the blown one.
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Where have you been looking ? RPM signal for what ?
Tachometer
The IPC displays the engine speed as determined by the BCM via a class 2 message. The BCM receives a class 2 message from the PCM indicating the engine speed. The tachometer will default to 0 RPM if:
• The PCM detects a malfunction in the engine speed sensor circuit.
• The IPC detects a loss of class 2 communications with the BCM.
• The BCM detects a loss of class 2 communications with the PCM.
The CKP sensor is used for ignition timing, the fuel injector timing, misfire diagnostics and tachometer display. The CKP sensor is connected to the ECM by a signal circuit and a low reference circuit.
Hi Ashley Farmer , my name is Jeff Armer . Which solenoid , your Cavalier has four , Pressure control solenoid , TCC - torque converter clutch solenoid , 1-2 shift solenoid and 2-3 shift control solenoid . And all are located inside the transmission . Do you have a DTC - diagnostic trouble code stored in the PCM - powertrain control module ?
That is not a computer reset, first check and see if you have a check engine light come on when key is first turned on, if not then the PCM (computer) is either dead or the power to it is.
Some fault code is stored in the PCM (computer); to know what is the problem, I suggest scanned the PCM with some scanner reader codes. Autozone or AutoShop with this tools sometimes make this for free.
Firing Order on 2.2 liter: 1-3-4-2
Cylinder number: 1-2-3-4 from passenger to driver's side
From the coil from fire wall to radiator: #1 coil 4-1 #2 coil 3-2
Good luck and this should help you get your car running 100% again.
before you change the pcm. check battery cable to the starter sometimes they get lose or burn brake . chek the engine fuse . its in the engine compartment.
Same problem. Went to 2 Autozone stores and neither could read it. We looked at every fuse in fuse box. Man said either a wiring problem between diagnostic connector and PCM or it was the PCM itself.
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