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Home >> Isuzu >> 2001 >> Rodeo LS, 3.2 W, 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.2L & 3.5L >> Diagnostic Tests >> DTC P1618: Serial Peripheral Interface Pcm INTERPROCESSOR Communication Error >> Circuit Description

Circuit Description

Serial Peripheral Interface (SPI) communication is used internally by PCM to send messages between engine processor and automatic transmission processor. Included in each message sent between both processors is a checksum value of message. Both engine processor and automatic transmission processor will compare this checksum value with calculated value. If checksums do not match, receiving processor will view new data as being corrupted and ignore values. Receiving processor will then use previous message. Receiving processor will then send a message to sending processor informing it that its last message was corrupted. Conditions for setting DTC:

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