Main Relay (Computer/Fuel System): Testing and Inspection

Work Flow

NOTE:
^ When LCU connectors are disconnected for more than 1 minute such as during trouble diagnosis, the "disconnected" data will be memorized by the BCM (Body Control Module). Therefore, after reconnecting the LCU connectors, erase the memory.

^ To erase the memory, perform the procedure below.
Erase the memory with CONSULT or turn the ignition switch to "OFF" position and remove 7.5 A fuse (No. (56) located in the fuse and fusible link box).




Power Supply Circuit Check




Ground Circuit Check

Data Lines Circuit Check




Data Lines Open Circuit Check

NOTE: When checking data line circuit, disconnect BCM and all LCU Connectors.

1. Disconnect BCM and LCU connectors
2. Check continuity between BCM and LCU terminals.


Data Lines Short Circuit Check




1. Disconnect BCM and LCU connectors
2. Check continuity between BCM and body ground.




3. Check voltage between BCM terminal and body ground.