Method of verifying integrity of control module arithmetic logic unit (ALU)

A method of validating an operational integrity of a vehicle control module that includes i through N registers, comprising:

• inputting a first test value into register i;
• inputting a second test value into registers i+1 through register N, where N is an integer greater than 2;
• performing a first set of operations between register i and each of registers i+1 through N to produce a first set of results;
• indicating a fault when one of said first set of results varies from a first predetermined result;
• incrementing i after performing said first set of operations to generate said first set of results;
• and
• performing said first set of operations between said register i and each of registers i+1 through N to produce a second set of results after said incrementing,
• wherein said first set of operations include at least one of AND, OR, less than (<), less than or equal to (≦), greater than (>) and greater than or equal to (≧).

A method of verifying the integrity of an arithmetic logic unit (ALU) of a vehicle control module that includes 1 through N registers, comprising:

• inputting a first seed value into one of N registers of said ALU, where N is an integer greater than 2;
• inputting a second seed value into remaining registers of said N registers;
• performing a first set of operations between said one of said N registers and each of said remaining registers to produce a first set of results;
• setting a respective bit of a result string based on each of said first set of results;
• indicating a fault when said result string varies from a key;
• inputting said first seed value into said remaining registers;
• and
• performing a second set of operations between said one of said N registers and each of said remaining registers to produce a second set of results.