Gauges Stopped working while on Highway, dimmer switch also doesn't work

[mngoalie32]

On my way home from work yesterday, my Gauges magically all stopped working. The Distance to Empty also doesn't have a value in it. I checked some other things and my dimmer switch does not work, but my odometer is still keeping track of my miles. Could this be a fuse? Or a bad ground issue? Curious if anyone has seen this issue before. For some more context, disconnecting the battery for 5 minutes, then plugging it back in allow it to temporarily work again.

 

[mngoalie32]

Getting a pending code for P0462, could it be a fuel sending sensor? If so, where is this located?

 

[Gunkk]

Looks like a couple things are going on with this car. As for the fuel sensor, it is attached to the fuel pump, access to which can be had through the access panel that is under the back seat. Key ON voltage 1.5 to 2.0 volts is normal range. (looks like "A/C on" is a typo in the service data)

 

[mngoalie32]

Are there 2 fuel level sensors? Looks like one on the fuel pump and one on the opposite side of the tank too, maybe I'm misunderstanding.

I have my multi meter, where exactly are those plugs where I have to check the number 7 pin on?

Thanks again for the help.

 

[mngoalie32]

From what I found there is 2 of these fuel senders, let me know how I would check if they are functional or not from the ECM Harness connector like you said. I'm pretty novice when it comes to electrical and I don't want to short anything out. Thanks!

 

[jep604]

Looks like a couple things are going on with this car. As for the fuel sensor, it is attached to the fuel pump, access to which can be had through the access panel that is under the back seat. Key ON voltage 1.5 to 2.0 volts is normal range. (looks like "A/C on" is a typo in the service data)


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Is the "A/C on" in the service data referencing more volts for added fuel when air conditioning is turned on? Not an electrician or auto mechanic.

 

[joegr]

Is the "A/C on" in the service data referencing more volts for added fuel when air conditioning is turned on? Not an electrician or auto mechanic.

I agree that this must be a misprint. It was probably a copy/paste error.

 

[mngoalie32]

regardless if that’s a typo I need to know how to test the fuel senders lol, anyone know where to check with the multi meter? I don’t want to unplug or short the ECU trying to do so

 

[mngoalie32]

Here are readings from each of the units for ohms, not sure if I did this correctly or not. One is reading 16 and one is reading 34

 

[Gunkk]

I would check voltage with Key ON between pins 7 and 29.

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[mngoalie32]

I would check voltage with Key ON between pins 7 and 29.

I’m not sure where it is that I do this or how exactly I do. Is this at the ECM connector and do I need to unplug the ECM?

 

[joegr]

I’m not sure where it is that I do this or how exactly I do. Is this at the ECM connector and do I need to unplug the ECM?

For the resistance check, the ECM should have been unplugged. You could damage it doing that reading with it plugged in (very unlikely though), but your sure it will cause the reading to be false.
It has to be plugged in and powered on for the voltage readings.

 

[mngoalie32]

I would check voltage with Key ON between pins 7 and 29.

I hate to be annoying but i'm clueless on what pins you're talking about or where the connector is for that. I'm very green when it comes to wiring.

 

[Gunkk]

I hate to be annoying but i'm clueless on what pins you're talking about or where the connector is for that. I'm very green when it comes to wiring.

Not sure which side of the ECU the connector is on (I don't have my car anymore), but the ECU is #1 in the pic below. I'd open the connector and put t-pins into back of #7 and #29 on the smaller of the two connectors (CTC-A) and check the voltage with key-on should be between the spec I posted above.

But if all that requires gymnastics (i.e. having to remove and flip over the ECU, which may not work if the harness isn't long enough), the exact same voltages (plus minus a few millivolts for wiring loss) should be available at the fuel sensor(s) middle and full wires from under the rear seat hatch (that correspond to pins #7 and #29) as shown on the wiring diagram OP posted above.

But also given that the cluster is having issues, I'd probably double check the power wire that feeds both the cluster and the sensors (also shown in that wiring diagram).