Main Relay
Main relay is located in underhood fuse/relay box located at left front corner of engine compartment. See Fig 1 or Fig 2 .
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 IAC 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.
NOTE:
Components are grouped into 2 categories. The first category covers INPUT DEVICES, which control or produce voltage signals monitored by the PCM. The second category covers OUTPUT SIGNALS, which are components controlled by the PCM.