No crank no start, code code P1237

Good afternoon,

Do you have a voltmeter or test light to do some checks?

P1237
Descriptor
Fuel Pump Secondary Circuit Malfunction
Probable Causes
Circuits Associated With Fuel Pump Relay (For LS6, LS8)
Fuel Pump Circuit Open or Shorted
Fuel Pump Driver Module (FPDM) Damaged
Fuel Pump Power Circuit Open or Shorted
Fuel Pump Return Circuit to Fuel Pump Driver Module (FPDM) Open
Fuel Pump Rotor Locked

I attached a wiring diagram. You need to verify the fuse circled has power on both sides. The wires at the module need to be confirmed as well. They should be hot in the start mode.

Roy

Thanks for the prompt reply. I have a multimeter and I have checked the inertia switch.

Okay, what were the results? Do you have voltage on both sides?

Roy

With a multimeter what is the best way to measure the voltage across the fuse?
For the module do I measure the voltage between pin 2& pin 9 as well as pin 2 and pin 10. Can I remove the connector and measure voltage on the connector pins ?

I have not measured the voltages yet but I just wanted to let you know that I had checked the inertia switch.

Use a volt meter and check for the voltage at the switch.

Roy

With a multi-meter what is the best way to measure the voltage across the fuse?
For the module do I measure the voltage between pin 2 and pin 9 as well as pin 2 and pin 10. Can I remove the connector and measure voltage on the connector pins with a multi-meter ?

Put the black lead on a good body ground and the red on the terminal. Check the voltage at each pin.

Roy

Hi Roy,
Thanks for your prompt reply.
Here are the voltages that I measured
both side of the fuel pump fuse 12.04 v
here are the voltages on all the pins on the module
pin1 -.06 V
pin 2 .03 V
pin 3 .02 V
pin 4 0 V
pin 5 0 V
pin 6 0 V
pin 7 6.77 V
pin 8 0 V
pin 9 11.98 V
pin 10 0.03 v

Parag

These voltages on the fuse were measured without removing the module. The voltages on the connector pin were measured after removing the module.

Roy,
I also measured the voltage across pin 2 and pin 9 with the module removed and the voltage was 12.04 volts. Please let me know if you need any additional information.

Thanks

Parag

It looks like you have power to the pump from the module.

I would replace the pump.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy