2.5l wiring

[Swampy]

D1_5 is reading 12.03 volts

D1_2 is reading 11.03 volts with key in the on position

[Ωhm]

Swap out Fuel Pump Relay with a known good relay. Retry D1_6 for B+ (Engine CRANKING).

[Swampy]

Just now, Ωhm said:

Swap out Fuel Pump Relay with a known good relay. Retry D1_6 for B+ (Engine CRANKING).

Will try that tomorrow it is getting late.

[Swampy]

16 hours ago, Ωhm said:

Swap out Fuel Pump Relay with a known good relay. Retry D1_6 for B+ (Engine CRANKING).

I swapped the relay and D1_6 is reading 0.45 volts when engine cranking

[Ωhm]

Need to check the condition of Engine Control Harness Splice_K. Splice K is located where the K is with the circle around it.

 

[Swampy]

17 minutes ago, Ωhm said:

Need to check the condition of Engine Control Harness Splice_K. Splice K is located where the K is with the circle around it.

 

Checked splice K. Assuming its the one that goes to the fuel pump relay, it is still the factory splice. the wires are clean and there is no corrosion. Would you suggest getting rid of the splice and using solder?

[Ωhm]

3 minutes ago, Swampy said:

Would you suggest getting rid of the splice and using solder?

Not yet.

Check terminals at the Fuel Pump Relay, under the Fuel Pump Relay Block.

[Swampy]

5 minutes ago, Ωhm said:

Not yet.

Check terminals at the Fuel Pump Relay, under the Fuel Pump Relay Block.

From the top of the block. there is no corrosion, from the bottom there is some of that black tar junky stuff

[Ωhm]

3 minutes ago, Swampy said:

black tar junky stuff

Undercoating maybe? Need to check wire to terminal connection.

 

[Swampy]

9 minutes ago, Ωhm said:

Undercoating maybe? Need to check wire to terminal connection.

 

The terminals look good. I'm trying to remove that undercoating stuff, I did see a small amount of corrosion on one of the terminals

[Swampy]

Can I run a new power wire for the fuel pump?

[Ωhm]

8 minutes ago, Swampy said:

Can I run a new power wire for the fuel pump?

I hate answering a question with a question, but did you find something wrong?

[Swampy]

Just now, Ωhm said:

I hate answering a question with a question, but did you find something wrong?

No I did not. I guess I am trying to skip steps before finding the real issue. 

[Ωhm]

Using a fused jumper wire, jump pin_1 to pin_4. Fuel Pump should run.

 

[Ωhm]

With fused jumper wire in-place, take voltage reading at D1_6 again.

[Swampy]

14 minutes ago, Ωhm said:

With fused jumper wire in-place, take voltage reading at D1_6 again.

With jumper wire between the pins, fuel pump is running and d1_6 is reading 11.8volts

[Ωhm]

With KEY ON and Fuel Pump Relay removed, take voltage reading at Fuel Pump Relay Block Pin_5.

[Swampy]

10 minutes ago, Ωhm said:

With KEY ON and Fuel Pump Relay removed, take voltage reading at Fuel Pump Relay Block Pin_5.

block pin_5 is reading 11.11 volts

[Ωhm]

With Fuel Pump Relay installed, can you jump Fuel Pump Relay Block Pin_2 to ground? If so, turn KEY ON. Does Fuel Pump run?

[Swampy]

16 hours ago, Ωhm said:

With Fuel Pump Relay installed, can you jump Fuel Pump Relay Block Pin_2 to ground? If so, turn KEY ON. Does Fuel Pump run?

Yes the fuel pump runs with the jumper wire from Pin_2 to ground and key on

[Ωhm]

Pin_2 at the relay block is the wire that goes to the Engine Control Unit (ECU). This wire controls the ON/OFF of the relay coil. The easy testing is done, time to dig out the ECU and disconnect the connector. Examine C200_6 for proper connection. With Fuel Pump Relay removed, check continuity between Fuel Pump Relay Block Pin_2 and ECU C200_6. Looking for 0Ω's. If continuity exist, suspect ECU, otherwise repair OPEN circuit.

 

[Swampy]

10 minutes ago, Ωhm said:

Pin_2 at the relay block is the wire that goes to the Engine Control Unit (ECU). This wire controls the ON/OFF of the relay coil. The easy testing is done, time to dig out the ECU and disconnect the connector. Examine C200_6 for proper connection. With Fuel Pump Relay removed, check continuity between Fuel Pump Relay Block Pin_2 and ECU C200_6. Looking for 0Ω's. If continuity exist, suspect ECU.

 

I got 0Ω's between the 2 connectors

[Ωhm]

I hate to spend your money, new Fuel Pump Relay, now suspect ECU.

[Ωhm]

One last call, make/break C200 a couple of times. See if problem goes away.

[Swampy]

  

7 minutes ago, Ωhm said:

I hate to spend your money, new Fuel Pump Relay, now suspect ECU.

You know more of this than I do. Also I had asked a fellow member a few months back if I should get a new ecu because I wasn't sure if the fire had fired the ecu as well

 

4 minutes ago, Ωhm said:

One last call, make/break C200 a couple of times. See if problem goes away.

I will do this now. Question- if its the on/off switch for the fuel pump that isnt working... could I wire an actual switch and control the fuel pump manually?