When the ignition key is turned to the ON position, The PCM turn the fuel pump on briefly. For safety reasons, the PCM will turn the pump off again in a few seconds if the engine doesn't start. When the ignition key is moved to the START position and back to ON, the PCM relies on the crank position sensor signal to activate the pump.
Check for spark, compression and the crank sensor and tell me what happens
If you want to check the fuel pump, attach a digital multimeter (DMM) to the positive and negative fuel pump terminals, and then turn the ignition on. Your DMM should briefly read battery voltage (12 volts). If it doesn't, look for a break in the circuit somewhere between the fuel pump and the relay. The relay have been replaced so I assume it is good one and I believe the problem is not there.
Tuesday, May 11th, 2010 AT 10:54 AM