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How you tell if idle air control going bad?
you can do so by backprobing the iac or buy the idle speed
What is code PO1148 on a Nissan Sentra?
P1148: CLOSED LOOP CONTROL (1.6L Models only) Overall Function Test- Start engine and wrm to operation temperature. Using voltmeter, measure voltage between PCM harness connector terminal No. 46 (positive lead) and No. 43 (negative lead) by backprobing connector. Monitor voltmeter with engine at 2000 rpm. Voltage should be less than .23 volts at least once and more than .61 volts at least once. Code P0130, P0133, P0134: Front heated Oxygen Sensor checks are similar checks covered under P1148. This information is from the 1998 Mitchell's Imported Manual.
How do you test the Electronic Control Module on a 1993 Pontiac Transport?
The only definitive test for the ECM for all possible problems is to establish a set of circumstances during which the behavior/symptom you expect is caused by the ECM always occurs and create these same conditions using a known good ECM.Failing that, you can test the vehicle systems around the ECM and determine that there is definitely no (external) problem other than the ECM to prove that the ECM is faulty. Typically, you determine which inputs and outputs are related to the undesired behavior and check for correct signals in/out of the ECM by backprobing the connectors and using suitable equipment including a quality multimeter and an oscilloscope. Do not forget to verify that the connectors make good contact at the ECM.Also, try gently tapping the ECM with a screwdriver handle or twisting the ECM with your hands.
What is a p0122 trouble code and what to do to fix it on a 2000 Chevy cavalier?
Throttle Position Sensor circuit low input. Testing procedure is complicated,but I would say the sensor is not putting out enough current to the computer so it don't know if you are wide open or sitting at a red light.. They are easy to replace but hard on the pocket. There should be plenty of them in a salvage yard cheep. Or get a whole throttle body on eBay for even less. But I would replace the TPS, its rare but they do go bad.Update....With the engine OFF and the ignition ON , check the voltage at the signal return circuit of the TP sensor by carefully backprobing the connectorVoltage should be between using a DVOM,,,(aka...Volt Meter) 0.2 and 1.4 volts at idle.Slowly move the throttle pulley to the wide open throttle (WOT) position and watch the voltage on the DVOM. The voltage should slowly rise to slightly less than 4.8v at Wide Open Throttle (WOT).If no voltage is present, check the wiring harness for supply voltage (5.0v) and ground (0.3v or less), by referring to your corresponding wiring guide. If supply voltage and ground are present, but no output voltage from TP, replace the TP sensor. If supply voltage and ground do not meet specifications, make necessary repairs to the harness or PCM.Erase the trouble code with your "handheld".Don't have a "handheld"..?... Try erase all memory of the computer by pulling the underhood fuse marked "ICM" for about 30sec. ,It should be a 20amp fuse... it may run a little rough at first (10 sec. max)until it relearns the things it needs to know.
