What happens when the 5V reference wire is grounded?
What happens when the 5V reference wire is grounded?
The 5V reference wire was the first wire in the harness to be grounded. Keep in mind that the ECM/PCM also needs the 5V to operate and it lost power as well. On this vehicle, the starter circuit also shut down. As I stated earlier, the other 5V reference wires will be lower or show 0A.
How many connectors does a GM 4.3L PCM have?
The 1996-97 PCM (Powertrain Control Module = Fuel Injection Computer) on your 4.3L, 5.0L or 5.7L Engine has a total of 4 connectors. NOTE: For other PCM pin-out charts, take a look at the following:
How to test the amperage on a 5V reference circuit?
To test the amperage on a 5V reference circuit, these simple procedures will give you the best results: •Identify all 5V reference wires. onto each 5V reference wire that needs to be tested. Remember, this test is performed at the computer. •Zero the meter each time with the vehicle’s ignition switch off. This is a very important step.
What should the voltage be on the OBD II scanner?
With the ignition key ON and no bus activity, BUS + should read 0V BUS should read 5V With the ignition key ON and bus activity, the voltage should vary from 0 to 5V depending on the amount of bus activity! ADDITIONAL NOTES PCM receives battery voltage (B+) through a fuse or fusible link. Check for an open circuit.
The 5V reference wire was the first wire in the harness to be grounded. Keep in mind that the ECM/PCM also needs the 5V to operate and it lost power as well. On this vehicle, the starter circuit also shut down. As I stated earlier, the other 5V reference wires will be lower or show 0A.
The 1996-97 PCM (Powertrain Control Module = Fuel Injection Computer) on your 4.3L, 5.0L or 5.7L Engine has a total of 4 connectors. NOTE: For other PCM pin-out charts, take a look at the following:
With the ignition key ON and no bus activity, BUS + should read 0V BUS should read 5V With the ignition key ON and bus activity, the voltage should vary from 0 to 5V depending on the amount of bus activity! ADDITIONAL NOTES PCM receives battery voltage (B+) through a fuse or fusible link. Check for an open circuit.
To test the amperage on a 5V reference circuit, these simple procedures will give you the best results: •Identify all 5V reference wires. onto each 5V reference wire that needs to be tested. Remember, this test is performed at the computer. •Zero the meter each time with the vehicle’s ignition switch off. This is a very important step.
