Fuel Pump Dont operate

[Wilfredo]

Master Swicth on position II i have 12 Vdc on pump relay but the ECM dont give me the ground to operate the relay. I jump the contact to send 12 Vdc to fuel pump and work perfect.
somebody have any idea

 

[joey]

Did you swap out the relay to make sure it wasn't bad?

 

[Wilfredo]

Fuel pump relay

Yes i swap the relay . I already have 12 Vdc on relay terminal #30 all time and 12 Vdc on terminal #85 when switch is on II position but only read 6 volt from 85 to 86 , and when i read from 85 to battery negative terminal i got 12 vdc

 

[Disco Mike]

Pump is probably good, may have a bad crank sensor which if it has failed will not allow the ECU to engage the fuel pump and or the coils.
Check for voltage from the Cranks sensor when the engine is turning over.

 

[greg409]

Fuel cutoff?

 

[Wilfredo]

I already reset fuel cu off - 12vdc before and after switch

Thank for the message from disco mike because i clean crank sensor electrical connection and then turn on the engine but after 3 minute start to give me a rpm erratic and then shut down like crack sensor intermittent failure i will replace the sensor and let you now

 

[Wilfredo]

I remplaced the Crankshaft crank sensor $ 70.00
Check and operation was good
thank for all