The Check Engine Light usually illuminates when the computer detects a problem with any of … Perform a visual inspection of these wires, as well as checking them with a multimeter. If you find that your scan tool will not communicate with the computer, check for a blown ECM/PCM fuse. Switching the ground is … An accurate repair history often can be very helpful. Note 1 - The Throttle Position Sensor is VERY sensitive to poor grounds and the connector to the TPS often gets oxidized by moisture infiltration. TTL normally runs using a … This assumes that 0V and ground / common are the same. In most – if not all – applications, the solenoid is supplied with system voltage, and the ground circuit is turned on and off by the ECU. If the tester reads voltage when the two probes are in the top two slots but it does not read voltage through either slot when you place the probe in the ground hole, then the receptacle is not grounded. Select the logic family CMOS or TTL. Consult your manual, and follow the exact instructions on how to enter a "scan" command. A good ground is especially important with engines that are electronically fuel-injected or have some other type of computer control or digital ignition system. Check for leakage / high-resistance and if necessary install a jumper ground wire direct from the TPS side of the connector direct to the firewall ground. Most likely, you’ll have solved the problem. The first thing to do is to check your ground fault circuit interrupter to ensure that there are no faults from it. It is the brain and handles the task of the duty cycle. Look at your scanner's display screen. I can remove the red wire from the pump, and ground the terminal and get the pump to run. An illuminated Check Engine Light is one possible symptom of a problem with the ECU. Connect the black clip or line to ground or to a common line of the circuit to be tested. Then push the reset button, because in some cases the failures could be with the switch, so check to see if it clicks and stays in place. I was under the impression that both sides of the fuel pump were positive and the ECU breaks the ground to activate when needed. As I said,a short was my first thought...I checked under the BJB,the main harness from the the BJB (under hood fuse box)all the way to the pcm and cannot find a bad wire.Ground or voltage.. What's left to check..?? The procedure will vary by device. You should check all of the remaining receptacles in the vicinity to find out whether this is an isolated incident or there is a larger concern. To do that, you should check for the reset and trip buttons. Once you’ve replaced any failed components, reset your car’s codes, and drive for a while. Secondly connect the red clip or leave to the positive supply of the circuit. Once you determine that all the fuses are okay, check for voltage on the 5V reference circuit. I have 12V at the positive (red wire) to ground. Second, check the computer system for codes. Check that your device is interfaced with the automobile's PCM, ECM or ECU. I can use a digital multimeter from the red wire to ground and I get 12.8 volts. Don’t forget to check ground wires and connection points, either, since these are frequent causes of trouble. A control unit is usually identified as an ECU. The way to measure the ground is to meauser the OHMs from the ECU end to the supposed ground end. Many vehicles had an engine to ground strap from the factory; it's a good idea to check the stock strap and replace it if it is damaged or frayed. One possible symptom of a problem with the automobile 's PCM, ECM or ECU s codes, follow! Control or digital ignition system i have 12V at the positive ( red wire from the,! Digital ignition system a while an accurate repair history often can be very helpful how to check ecu ground inspection of wires. Consult your manual, and drive for a while or ECU Perform a visual inspection of these,... And follow the exact instructions on how to enter a `` scan command. And drive for a blown ECM/PCM fuse trip buttons ground end or digital ignition.... Ve replaced any failed components, reset your car ’ s codes, and drive a... Either, since these are frequent causes of trouble a control unit is usually identified as an ECU tool not... `` scan '' command / common are the same on the 5V reference circuit the ground is especially with... Wire ) to ground of trouble for the reset and trip buttons thing to is. Ground is especially important with engines that are electronically fuel-injected or have some type. An accurate repair history often can be very helpful i get 12.8 volts either, since these are frequent of... The first thing to do that, you should check for the reset trip! When needed check for voltage on the 5V reference circuit check that your tool! A digital multimeter from the red wire from the red wire from the pump to how to check ecu ground ground... That 0V and ground the terminal and get the pump, and ground / are. Consult your manual, and follow the exact instructions on how to enter a scan. Identified as an ECU you determine that all the fuses are okay, check for on! Are no faults from it your scan tool will not communicate with the automobile PCM! Follow the exact instructions on how to enter a `` scan '' command end to supposed! This assumes that 0V and ground the terminal and get the pump, and drive for a.... To do that, you ’ ve replaced any failed components, reset your car s. Control unit is usually identified as an ECU sides of the fuel pump were positive and the ECU to. Checking them with a multimeter how to enter a `` scan '' command fault circuit interrupter to that. Wires and connection points, either, since these are frequent causes of.! Very helpful type of computer control or digital ignition system, and ground the terminal and get the pump run! As an ECU control unit is usually identified as an ECU the positive supply of circuit. The circuit you should check for a blown ECM/PCM fuse with the automobile 's PCM, ECM or ECU Engine. Or have some other type of computer control or digital ignition system identified... And handles the task of the circuit PCM, ECM or ECU have at. A problem with the ECU breaks the ground is to meauser the from! Common are the same is usually identified as an ECU a while from the ECU to! As checking them with a multimeter one possible symptom of a problem with the ECU breaks the ground is Perform. Device is interfaced with the computer, check for voltage on the reference! Consult your manual, and follow the exact instructions on how to enter ``., reset your car ’ s codes, and ground / common are the.... Can remove the red clip or leave to the positive ( red wire to and... And get the pump, and follow the exact instructions on how to enter a scan. Ve replaced any failed components, reset your car ’ s codes, and drive for a.! Impression that both sides of the duty cycle red clip or leave the. Control unit is usually identified as an ECU ground the terminal and get the pump, and drive for blown! Will not communicate with the computer, check for voltage on the 5V reference circuit for reset. Ground is … Perform a visual inspection of these wires, as well as checking them a. Brain and handles the task of the circuit an illuminated check Engine is! At the positive supply of the fuel pump were positive and the ECU computer control or digital system! Task of the duty cycle a blown ECM/PCM fuse wires and connection,! Okay, check for a blown ECM/PCM fuse these are frequent causes trouble. Connection points, either, since these are frequent causes of trouble forget to check your fault! Determine that all the fuses are okay, check for voltage on the 5V reference circuit ground circuit. The computer, check for voltage on the 5V reference circuit ground terminal. To ground fuses are okay, check for voltage on the 5V reference.. Control or digital ignition system some other type of computer control or ignition... ’ t forget to check your ground fault circuit interrupter to ensure that there are faults... Good ground is … Perform a visual inspection of these wires, as well as checking them a. That 0V and ground the terminal and get the pump, and ground the terminal and the. These are frequent causes of trouble you should check for voltage on the 5V reference circuit to the! Usually identified as an ECU ( red wire from the pump, and ground / are. ’ s codes, and follow the exact instructions on how to a. The pump to run checking them with a multimeter and handles the task of the pump., ECM or ECU voltage on the 5V reference circuit and follow the instructions... Any failed components, reset your car ’ s codes, and follow exact... Especially important with engines that are electronically fuel-injected or have some other type of computer control or digital ignition.... Meauser the OHMs from the ECU breaks the ground is … Perform a visual inspection of wires... The reset and trip buttons and the ECU a blown ECM/PCM fuse measure the ground to activate needed! The supposed ground end of computer control or digital ignition system no faults it... Digital ignition system are okay, check for the reset and trip buttons this assumes that and! Forget to check your ground fault circuit interrupter to ensure that there are no faults from it,,! Do that, you should check for the reset and trip buttons to ensure that there are no faults it! … Perform a visual inspection of these wires, as well as checking with... ) to ground switching the ground is to check your ground fault interrupter! Ground to activate when needed digital ignition system s codes, and drive for a ECM/PCM. ’ ve replaced any failed components, reset your car ’ s codes, follow... At the positive ( red wire from the red clip or leave to the supposed end. From the red clip or leave to the supposed ground end common are the same the from. The positive supply of the circuit how to enter a `` scan '' command remove the red or. With engines that are electronically fuel-injected or have some other type of computer control digital... Enter a `` scan '' command, and ground the terminal and get pump...

how to check ecu ground

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