The mechanic told me this relating to the P1605 code.
"P1605 sets when ECM(PCM) has internal malfunction with knock control system. ECM operates in fail safe mode and retards ign timing to maximum allowed. If no other DTC's are present suspect faulty ECM."
I would appreciate what you think about that code. It appears that the T100 and
4runner are very similar. Are you suggesting that the way the wiring is routed to the sensors could be the problem. Any other opinions of the symptoms would be appreciated..
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