Before you dive in with a multi meter you will want to obtain a free wiring diagram for your specific modelyou may need to locate a specific color wire and its exact location. Wiring diagrams gmc.
Iac Count And Different Mfg Iac Motors Same Same The
Gm iac wiring diagram. A2 not used a3 not used a4 gry to egr relayoptional this is a ground from the ecm to control the egr relay. It shows the components of the circuit as simplified forms and the power as well as signal links in between the devices. If your rpms are the same both times your idle control valve isnt working. Once its disconnected tuck the wire out of the way restart your car and wait a minute or 2 before checking your rpms. Heres a list of the pins but they are also on the wiring diagrams above. This is a ground to turn on the light.
558 408 j2a j2b j3 j4 connector and pin kit contains connectors and pins but no wiring. Block diagram acronyms individual components and their function schematic diagram. For tips on how to check an idle air control valve in a gm or ford car read on. The schematic below shows how such a motor is wired. A wiring diagram is a simplified standard pictorial depiction of an electrical circuit. A1 grnwht this wire is used to energize the fuel pump relay.
C iac idle air control c fuel pump relay c the two fuel injectors c and the spark timing. The drive circuitry for such a motor requires a separate h bridge control circuit for each winding. The way to tell if the motor is working is to reset the iac valve touch one battery cable to the other to short out the ecms memory then watch it closely on start up to see if the iac motor moves to a correct location to control the idle. If your motor starts to idle at 650 700 rpm or so the iac motor should be working correctly. A5 brnwht sesservice eng soon light. 558 406 gm drive by wire harness complete terminated harness with j3 connector to operate late gm drive by wire systems.
Connections for each component and normal gm wiring color codes. On gm iac steppers the one coil usually has blue wires leading to it the other coil has green wires. Assortment of gm body control module wiring diagram. If you run into an electrical problem with your gmc you may want to take a moment and check a few things out for yourself.
Gallery of Gm Iac Wiring Diagram
