Difference between PCM 96 and 98 ???
- Thread starter Andrews
- Start date
vprtech
Enthusiast
Here is a short how-to to check power and grounds at your ecm. Disconnect the power cable at the pdc before you remove C1. Once C1 (the black connector) is unplugged remove the connector back cover by pinching the tabs as shown below. Plug the connector back in, reconnect power cable at pdc and then insert the t-pins into :
Pin 2 -> (d. blue / grey) should have battery voltage here when ignition key is to the run or start position
Pin 22 (red/white) -> this wire should have power at all times
Pins 31 and 32 -> these are both grounds
I would first check voltage from terminal 2 and 22 using terminal 31 and 32 as the grounds.
You can also inspect the C1 connector when it unplugged from the ecu to see if any of the terminals have pushed back.
Pin 2 -> (d. blue / grey) should have battery voltage here when ignition key is to the run or start position
Pin 22 (red/white) -> this wire should have power at all times
Pins 31 and 32 -> these are both grounds
I would first check voltage from terminal 2 and 22 using terminal 31 and 32 as the grounds.
You can also inspect the C1 connector when it unplugged from the ecu to see if any of the terminals have pushed back.
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If you have Power and Ground, No Comms, No Fuel Pump Prime/ASD Relay Check... Module is dead and you are wasting your time on any additional diag at that stage.
vprtech
Enthusiast
As someone else said, if the fuel pump relay is not being actuated by the ecu and you power and grounds are good then it’s a ecu problem.
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