Can a bad solenoid cause a bad ECM?
Can a bad solenoid cause a bad ECM?
Generally, if you unplug the TCC solenoid at the transmission and the symptoms go away, you have found the problem. Sometimes this can be misleading, because you don’t know for sure if the cause is a bad solenoid, dirt in the valve body, or a bad signal from the ECM.
Where to check 12 volts on GM solenoid?
Check for 12 volts to terminal A at the transmission Assembly Line Diagnostic Link (ALDL) as described at the beginning of the Regular Method, above. Most quick methods of testing can be done at the ALDL, which is the plug interface that your factory-like diagnostic tool plugs into.
What happens to the solenoid on a torque converter?
When the ECM signal stops, the solenoid closes the valve and pressure is vented, causing the TCC to disengage. This lets the torque converter lock in “gear” or unlock out of “gear.”
What should I do if my GM solenoid lock up?
Connect the alligator clip of your test light to ground. Unplug the wires at the case and place the tip of your test light on the terminal marked A. Do not depress the brake pedal. Computer controlled vehicles: turn on the ignition and the tester should light. All other vehicles: start the engine and bring to normal operating temperature.
Check for 12 volts to terminal A at the transmission Assembly Line Diagnostic Link (ALDL) as described at the beginning of the Regular Method, above. Most quick methods of testing can be done at the ALDL, which is the plug interface that your factory-like diagnostic tool plugs into.
Generally, if you unplug the TCC solenoid at the transmission and the symptoms go away, you have found the problem. Sometimes this can be misleading, because you don’t know for sure if the cause is a bad solenoid, dirt in the valve body, or a bad signal from the ECM.
When the ECM signal stops, the solenoid closes the valve and pressure is vented, causing the TCC to disengage. This lets the torque converter lock in “gear” or unlock out of “gear.”
Connect the alligator clip of your test light to ground. Unplug the wires at the case and place the tip of your test light on the terminal marked A. Do not depress the brake pedal. Computer controlled vehicles: turn on the ignition and the tester should light. All other vehicles: start the engine and bring to normal operating temperature.
