Nope, no ideas as that's exactly what it is supposed to do. When in diagnostic mode, the ECM will energize virtually every relay under its control, including the Main Fan Relay.when I short the ALDL diagnostic link to earth to show codes the radiator cooling fan comes on as well.
Any idea's ????
The ECM will send an energize signal (Battery Voltage) to the Fuel Pump Relay. If the Fuel Pump does not run during these two seconds, the Fuel Pump Relay may be at fault.Thanks for response
Also when you turn ignition on the fuel pump does not energise for 2 sec's ,is that controlled by ECM ?
How did you test the relay? Looking at the schematic:Tested fuel pump relay thats ok, just not the 2 sec's when ignition is turned on.
This test is mainly for the Fuel Pump as it passes through the Normally Closed contacts of the Fuel Pump Relay. Once the ECM energizes the relay, these contact open and the Normally Open contacts close. Your test didn't test if the relay can energize or if it does, if the NO contacts are good. These relays are cheap enough to have one for the toolbox as the fastest method of troubleshooting this is by substitution. Post back how you make out with the checks.Tested fuel pump relay by putting 12v to aldl terminal for f/pump