How do I check my ECU continuity?
If you have continuity, plug in all connectors in engine harness, and test between the appropriate pins on ecu. If you have no conitunity there, then you have a break in your harness between the ecu plug, and the plug that connects to the engine harness.
How is continuity tested in a car harness?
“The two points of a wire were run through a light bulb for continuity,” says Harter. “If the light came on, it meant current was flowing and the wire was good.” By the 1950s, harness manufacturers began using telephone stepper switches (relays) to continuity test each harness wire and verify its location in a connector.
When did they start testing wire harnesses for cars?
By the 1950s, harness manufacturers began using telephone stepper switches (relays) to continuity test each harness wire and verify its location in a connector. Testing was fairly slow, and remained so for many years as automobiles required larger harnesses to power windows, seats and other standard features.
How does the ECU determine which gear a transmission is in?
If either of these terminals provides a 12-volt signal to the ECU, it determines that the transmission is in neutral, second gear or first gear. If the ECU does not receive a 12-volt signal at terminals “T’ or “1,” the ECU determines that the transmission is in the “D” range. Some neutral start switches have contacts for all gear ranges.
What kind of tester do they use to test wire harnesses?
Uddeborg says manufacturers use Cablescan testers to test automotive harnesses at all stages of production, as well as prototype testing and fieldreturn analysis. TestMate, one of the company’s continuity testers, tests up to 256 points with an expansion unit. Its universal mating fixture accepts interface cards for many types of connectors.
When to disconnect the ECU from a car?
Always disconnect the battery or turn off the battery switch (Power Train Battery) prior to disconnecting or reconnecting ECU connectors! For 1992, 1993, 1994, and early 1995 models if experiencing erratic or no display; especially when there is cold weather or have retrieved any trouble codes.
Where is the ECU located on a truck?
If “NOT”, locate the ECU (in most RV’s is near shift selector, close to VIM Module or mostly on trucks, close to transmission (just follow bundle of wires from transmission). Disconnect the battery first, then unplug all three connectors from ECU and reconnect battery. Closely check the GRAY connector for numbers.
What kind of wiring harness do I Need?
• The next piece of information you need is the wiring harness military specification that most military aircraft comply with. This specification is SAE AS50881 (at one time it was MIL-STD-5088) “Wiring Aerospace Vehicle”.
How do you test an ECU transmission lamp?
Lamp must glow brightly. Next turn ignition and battery “OFF”, reconnect GRAY ECU connector only, then reconnect battery and turn “ON” ignition. Then very carefully touch gold plated pins #16 and #32 (on ECU side BLACK connector) with lamp test leads. Lamp must glow bright.