Do you need to test a TCM ignition switch?
NOTE: All TCM Ignition switches, regardless of the part number, date code or manufacturing number are to be functionally tested in accordance with the latest revision of TCM Ignition Systems Service Bulletin SB653 to insure the integrity of the magneto grounding circuit.
How is a relay used in a TCM?
The TCM power relay control circuit is generally constructed with a fuse and/or a fusible link. A relay is used to initiate a smooth transference of voltage to the respective component without danger of a power surge.
Is the Transmission Control Module ( TCM ) integrated with the ECM?
Usually the TCM is integrated into a single housing with the engine control module (ECM). This integrated assembly is known as the powertrain control module (PCM). Even though they are integrated, the portion of the module which controls (automatic) transmission function may be powered up separately from the ECM.
What should the voltage be on an ignition switch?
Place the ignition switch to the run position after turning it on. The voltage of the battery should be reading at the positive terminal if the ignition switch is working effectively. If there is no voltage reading, or the reading is too low, there is a problem with the ignition wiring or the ignition switch.
How do you turn off a pertronix ignition switch?
Attach positive (red) lead of your voltmeter to the positive side of the coil, and the negative (black) lead to an engine ground. Turn the ignition switch to the run position. Now read the voltage at the positive coil terminal. Turn the ignition switch off. If the voltage measured is approximately 12 volts, no resistance wire is present.
What to do if your ignition control module is not working?
Place the spark plug on a metal surface on the engine. Crank the engine and check for a spark at the old spark plug. No spark on the plug indicates an ignition problem.
Place the ignition switch to the run position after turning it on. The voltage of the battery should be reading at the positive terminal if the ignition switch is working effectively. If there is no voltage reading, or the reading is too low, there is a problem with the ignition wiring or the ignition switch.
How do you test ignition switch with multimeter?
How To Test Ignition Switch With Multimeter. Turn the ignition key to the off position. Use the positive lead of the multimeter to back-probe the module’s power feed wire. The negative lead should go into the distributor base’s good ground. Now the key has to go to the run position and you have to measure the voltage with the meter.