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Replaced fuel pump, fuel pump relay. Ignition module and

Customer Question
injectors still not getting fuel...
Replaced fuel pump, fuel pump relay. Ignition module and injectors still not getting fuel why
Submitted: 1 year ago.Category: Chevy
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Answered in 11 minutes by:
10/26/2016
Chevy Mechanic: Jared D, ASE Certified Technician replied 1 year ago
Jared D
Jared D, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1,975
Experience: Shop Supervisor at County Fleet
Verified

Good morning,

When you turn the key to on does the check engine light come on?

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Customer reply replied 1 year ago
No check engine light
Chevy Mechanic: Jared D, ASE Certified Technician replied 1 year ago

It sounds like you have a bad ignition control module. It controls whether the fuel pump will run when the key is on and whenever we see these trucks come in with no check engine light illumination we change the ignition module right away.

I need to step out into the shop for a minute. I'll be back.

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Customer reply replied 1 year ago
I have changed the ignition module already and still same issue
Chevy Mechanic: Jared D, ASE Certified Technician replied 1 year ago

I'm sorry, what I thought was a quick job turned into an all morning thing. Have you checked to make sure that you are getting power and ground at the ignition module?

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Chevy Mechanic: Jared D, ASE Certified Technician replied 1 year ago

Are you getting power at the fuel pump relay? You should have power on the black/white wire and power from the PCM on the green/white wire at the relay.

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Customer reply replied 1 year ago
have power
Chevy Mechanic: Jared D, ASE Certified Technician replied 1 year ago

So you are getting power to the relay from the PCM but not to the pump?

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Customer reply replied 1 year ago
I'm not getting power to the injectors. Could it be the computer?
Chevy Mechanic: Jared D, ASE Certified Technician replied 1 year ago

1. Perform scratch tests using a conventional bulb type test light connected to B+.

2. Disconnect the 4-terminal connector at the distributor.

3. Turn the key on.

4. Touch the test light to the Purple/White wire and check for an injector pulse.

5. If no injector pulse, repeat this test at the Powertrain Control Module (PCM) and verify that the PCM is powered and grounded properly, and check for engine RPM on the scan tool when cranking.

6. If injector pulse is generated, reconnect the distributor and remove the distributor cap.

7. Touch the test light used in step 4 to the Green wire of the pickup coil attached to the ignition control module at the terminal labeled "P" with the key on.

8. Check for injector pulse and spark.

9. If OK on both spark and injector pulse, connect a Digital Volt Ohm Meter (DVOM) set to AC volts to the Green and White wire of the pickup coil and crank the engine.

10. If voltage is less than 0.7 V AC, replace the distributor shaft and pickup coil.

11. If no spark is generated during step #7, Verify the ignition coil has good power supply. Connect a test light across the White wire (coil trigger) and the Pink (coil power) and repeat step #7. If the test light blinks, replace the coil.

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