Fuel punp will not get 12 volts, only gets 5 volts at the puple wire. Relays and fuses are good. I get 12 volts at two terminals at the relay constantly, and 0 at the other two. we put in a new fuel pump. We can run the car by squrting fuel into the intake. any Ideas?
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The ASD sense circuit informs the PCM when the ASD relay energizes. A 12 volt signal at this input indicated to the PCM that the ASD has been activated. This input is used only to sense that the ASD relay is energized.
When energized, the ASD relay supplies battery voltage to the fuel injectors, ignition coils, and the heating element in each oxygen sensor. If the PCM does not receive 12 volts from this input after grounding the ASD reley, it sets a Diagnostic Trouble Code (DTC).
Automatic Shutdown Relay - PCM Output
The PCM operates the Automatic Shutdown (ASD) relay and fuel pump relay through one ground path. The PCM operates them by switching the ground path for the solenoid side of the realys on and off. Both realys turn on and off at the same time.
The ASD relay connects battery voltage to the fuel injectors and ignition coil. The fuel pump relay connects battery voltage to the fuel pump.
A buss bar in the power distribution center (PDC) supplies voltage to the solenoid side and contact side of the relay. The ASD relay power circuit contains a 20 amp fuse between the buss bar in the PDC and teh relay. The fuse also protects the power circuit for the fuel pump relay and pump. The fuse is located in teh PDC.
The PCM controls the relay by switching the ground path for the solenoid side of the relay on and off. The PCM turns the ground path off when the ignition switch is in the Off position. When the ignition switch is in the On or Crank position, the PCM monitors the crankshaft position sensor and the camshaft position sensor signals to determine engine speed and ignition timing (coil dwell). If the PCM does not receive the crankshaft position sensor and camshaft position when the ignition switch is in teh Run position, it will de-energize teh ASD relay.
The ASD relay and fuel pump relay are located in the PDC near the battery. The inside top of the PCD cover has a label showing relay and fuse location.
ASD and Fuel Pump Relays
The following description of operation and tests apply only to the Automatic Shutdown (ASD) and fuel pump relays. The terminals on the bottom of each relay are numbered.
' __85 ___________'
' __87A '87 '30 ___' Sorry for the crudeness of this. This is supposed to
' __86 ___________' be the relay terminals!
- Terminal number 30 is connected to battery voltage. For both the ASD and fuel pump relays, terminal 30 is connected to battery voltage at all times.
- The PCM grounds the coil side of the relay through terminal number 85.
- Terminal number 86 supplies voltage to the coil side of the relay.
- When the PCM de-energizes the ASD and fuel pump relays, terminal number 87A connects to terminal 30. This is the Off position. In the off position, voltage is not supplied to the rest of the circuit. Terminal 87A is the center terminal on the relay.
- When the PCM energizes the ASD and fuel pump relays, terminal 87 connects to terminal 30. This is the On position. Terminal 87 supplies voltage to the rest of the curcuit.
The following procedure applies to the ASD and fuel pump relays.
(1) Remove relay from connector before testing.
(2) With the relay removed from the vehicle, use an ohmmeter to check the resistance between terminals 85 and 86. The resistance shoud be 75±5 ohms.
(3) Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity between terminals 30 and 87A.
(4) Connect the ohmmeter between between terminals 87 and 30. The ohmmeter should not show continuity at this time.
(5) Connect one end of a jumper wire (16 guage or smaller) to relay terminal 85. Connect the other end of the jumper wire to the ground side of a 12 volt power source.
(6) Connect on end of another jumper wire (16 guage or smaller) to the power side of the 12 volt power source. Do not attach the other end of the jumper wire to the relay at this time.
WARNING: DO NOT ALLOW OHMMETER TO CONTACT TERMINALS 85 OR 86 DURING THIS TEST.
(7) Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohmmeter should now show continuity between relay terminals 87 and 30. The ohmmeter should not show continuity between relay terminals 87A and 30.
(8) Disconnect jumper wires.
(9) Replace the relay if it did not pass the continuity and resistance tests. If the relay passed the tests, is operates properly. Check the remainder of the ASD and fuel pump curcuits.
I know you said you replaced the relay, and this is a test procedure for the relay, but I have bought bad parts in the past. The description before the test procedure at least gives you an idea of what components are wired through and controlled by the relay. One of those may be faulty. Email me if you want or need wiring diagrams and I should be able to scan them and email them to you.
Your pump is controlled by the pcm using a 12 volt signal to the relay. Pull out the relay and probe the relay socket with a voltmeter. There should be 2 terminals with 12 volts when the key is on. With the key off, there should be one 12 volt terminal coming from the ecm b fuse. See top left of diagram below.
Use a jumper wire to get power to the fuel pump fuse. stay on the supply sides. Thats your easiest fix. Or replace the whole fuse panel. I've taken these apart and they are a mess inside. hard to fix, harder to get back together right. the problem is that one of the feed wires (which are all bare) has came loose or corroded and is not making a good connection, thus giving you 2 volts.
Check this.. Worst case scenario, Its the whole pump unit ( sending unit and all ) or the simplest, Check the ground wire on top of the chasis,on drivers side near the filler tube. Its a 13 mm bolt thru an eye terminal.. No Hidden fuse. But there is a relay.. and I think the A/c Relay with interchange if ya swap it out
the book just told me the fuel pump relay is near the ecm under the center console and to test it put the positive to terminal 10 and negative to terminal 8 and with power to the relay connect the negative probe of a voltmeter to the battery negative terminal (where the - is to the relay) and connect the positive to terminal 4 then 5 it should read out about 12 volts at each terminal, connect the jumper leads terminal 9 to battery (+) and terminal 6 to the battery (-) and with those relays connected to the relay check for continuity between terminals 3 and 2 there should be continuity remove the ground from terminal 6 the ohmmeter should read now read no continuity install jumper lead to terminal 3 to battery (+) and terminal 7 to battery (-) check for voltage at terminal 2 and battery (-) should be about 12 volts remove (-) from terminal 7 now should read nothing if anything doesn't read out what i said replace it and the numbers for he terminals start from the plug part you had to push on to remove the wires it goes 1-5 on the top and the bottom 1-6 and this would be with the clip on top if this did not help let me know i will read off the next part to check