actually there are more common causes besides relays even though the relays are commonly found to be the issue in most cases.
The most common causes :
EGI relay 1 open or short circuit
EGI Relay 2 open or short circuit
Main C relay open or short circuit
Ignition relay open or short circuit
Open ground circuit
Open across fuse: F6- EGI relay 1 or F7- EGI relay 2 open circuit
Corroded or broken wires at the ECM or lower left side step plate relay box
and body ground.
Internal open or short in the ECM
Abnormally low or high ECM to sensor output voltage detected
happy hunting!
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