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« Last post by bd on September 01, 2025, 11:34:37 pm »
The items labeled with yellow text, along with the ECM, are powered by the ECM I fuse via PNK/BLK circuit 439.
To test the components for shorts, switch the ignition OFF, unplug the EGR solenoid, EAC valve, and ESC module (yellow labels), and lay the connectors to the side. Connect an ohmmeter between the two pins of the EGR solenoid and then the two pins of the EAC valve. Both should measure greater than 10 ohms. If either measures less than 10 ohms, the component is faulty. Checking the ESC module is slightly more challenging. Use the ESC harness connector to determine which two ESC module pins connect to the PNK/BLK wire and the brown (BRN) wire. Connect the ohmmeter between those two module pins (should be terminals "B" and "D" according to the factory diagram). As before, if the measurement is less than 10 ohms, the module is faulty (don't be alarmed if the ESC module measures considerably greater than 10 ohms).
If all of your resistance measurements were 10 ohms or greater, reconnect the wiring harness to the three components. Trace the harness while carefully looking for any place where the harness comes into contact with bare metal or turns a corner around a sharp metal edge. Inspect for chafing or pinching of the harness or any of its wires.
The fuel pump circuit is powered by the ECM B (constant battery power) fuse via orange (ORG) circuit 440. The ECM supplies 12 volts to control the fuel pump relay via dark green & white (DK GRN/WHT) circuit 465. The black & white (BLK/WHT) relay wire is the relay ground. When the ignition is switched ON, the relay will energize the in-tank fuel pump via the tan & white (TAN/WHT) circuit 120 for up to two seconds before shutting off automatically if the engine does not start and run. The fuel pump should continue to run as long as the engine is cranking to start. The fuel pump relay connector has a 3" long RED/WHT pigtail with a brown connector. Jump the short RED/WHT pigtail to battery positive (B+) to bypass the relay and power the fuel pump directly for testing purposes only.
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