1999 Elantra sedan. Engine cranks normally but does not start and no power to fuel pump. Fuel pump works when jumped. Relay clicks like it should. Check engine light comes on when key turns like normal. The only other thing I noticed was the idle air control valve buzzing which I had not noticed before but certainly could have been there. Ideas on what else to check? Thanks
Look at the schematics I sent you and check the blue fusible link B 20 AMP in the fuse box under the hood. The second one is for the Idle Air control actuator.
The fuel pump test connector is behind the panel at the drivers left foot where the ALDL (computer) connector is. The connector is by the yellow tape, pull it out to check for voltage.
This should have battery voltage to it. If there is battery voltage to the fuel pump relay at terminal #1 on the relay then check the ground on terminal #5 on the relay which is terminal #1 on the plug at the ECM. This is the ground for the relay. If you ground the ECM terminal #1 and the relay engages then you would most likely need to diagnosis an ECM problem.
In the second schematic look at the Engine Control Relay; it has the Mass Air Flow sensor and the Idle Air control actuator in the same circuit. Look for loose connections or corrosion at the plug connections and terminals of the components and at the ECM. Check all body grounds for good connections.
Try these suggestions and get back to me with your results.
Thanks, two additional questions for the uneducated. One which side of ECM would be terminal #1.and two I see the two grounds right by the ecm but am sure I am missing a few under the hood. Do you have a diagram of body grounds?
This is the connector view of the ECM connector labeled C01.
This is the location of the grounds for the ECM and a picture of the location.
The other grounds are on the left and right fender near the head lights on the frame. The left ground is coming off the battery ground cable bolted to the fender.
This is the ground for the right side.