01 tiburon - No Power at the harness of the fuel pump.

psin2005 · 10-11-2012, 03:28 PM

Hey guys, so I have an interesting problem. I have an 01 tiburon and it cranks but does not start (turn over).

So I figured the problem could be fuel, spark or air. Checked the spark and air and they are good. Check the fuel and there was no gas going to the engine. So I took out the back seat and checked the fuel pump. The fuel pump turns on if manually given 12 volts but it doesnt turn on normally. Checked the voltage at the electric line coming in and it was 0. So I thought it was the fuel pump relay. I swapped out one of the relays from the front and still no voltage.

After a job to keep the frustration subsided, I decided to hook up an obd device to read the codes. The device (that I know usually works and worked in another car) was having a hard time connecting to the car but after 20 tries or so it finally connected and gave me these codes. (using pro scan 5.9)

1. P0100
Powertrain: MAF Sensor Ckt. Insufficient Activity

2. P0765
Powertrain: Shift Solenoid D Malfunction

I turned the car off and then on again and the codes had disappeared, but the connecting issue was still there.

Any thoughts on how to further proceed would be greatly appreciated.

Oh, I almost forgot to mention the pre cursor to how the car came to be in this predicament. I was driving but didnt notice that I was running low on gas. The gas dropped to almost the VERY end of E (past the little notch) but it still drove to the gas station. I filled up the tank and drove back home. I parked the car over night and tried to start it in the morning. It just cranked but did not turn over (start)

psin2005 · 10-11-2012, 03:30 PM

Also did the following as well.

Checked all the fuses and they all were good. (Checked them with a multimeter just to be sure).

Replaced the ECU w/ another one (same part number 00 tiburon)

Connected 12v to the port in the engine compartment and the fuel pump didnt get any power.

I also had the pump running on 12v (separately) and tried to start the car. Same as before, it would crank but not start.

acuratek · 11-11-2012, 05:46 PM

Try the crank position sensor. The pcm will not ground the fuel pump relay without a crank signal.

psin2005 · 11-13-2012, 05:11 PM

Quote:

Originally Posted by acuratek

Try the crank position sensor. The pcm will not ground the fuel pump relay without a crank signal.

not sure why, but I played around with the CPK sensor connection and it worked! thank you acuratek!