This also makes it hard to trouble shoot what the cause is. These systems are all tided together and will effect each other. Many different things can effect and cause the no voltage. system has to be functioning and that relay has to be pulled in in order to send power to the fuel pump relay and from there to the fuel pump on the B (black) wire going to the fuel pump relay and out the B-R (brown with red strip) wire to the fuel pump. From the info that I have giving you before, you can see that the E.F.I. Any of the the sensors, wiring, connections, or the ECM itself can prevent the fuel pump relay from pulling in. The ECM takes in information from sensors like the crankshaft position sensor to tell that the engine is cranking over and then will pull in the fuel pump relay to make the fuel pump run. The ECM does not want fuel going to the engine if the engine is not running (safety). The fuel pump relay will not pull in if the ECM is not taking the relay coil to ground to complete the circuit. (electronic fuel injection) relay to the fuel pump relay on the B (black) wire at the fuel pump relay base? When you turn the key on, do you have voltage on the B-W (black with white strip) wire feeding the fuel pump relay? Are you getting power from the E.F.I.
What that first test is asking is "Does the fuel pump relay open and close" and is there voltage in and out of relay. It is a factory Toyota handheld tester that plugs into the DLC3 port, which is the port that a OBD2 can also plug into. Sorry for the newb question, when it says handheld tester, is that an OBD2 scan tool? Dragginwagn wrote:Thanks for the troubleshooting guide jolt.
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