Main Relay

Main relay is located in underhood fuse/relay box located at right front corner of engine compartment. On all models, the main relay supplies power to the ECM, fuel injectors (8 amps) and Mass Airflow (MAF) sensor (4 amps). Relay is controlled by the ECM which has a second power feed. This enables the ECM to remain powered up after the ignition is turned off. During ECM power down, the ECM records all temperature readings and powers the Idle Air Control (IAC) valve to the cold start position. Failure of this relay will result in the ECM not being powered up, resulting in engine not starting due to absence of fuel and ignition.