Possible Causes

Possible causes are:

• ECT sensor malfunction
• Open circuit in Light Green/Black wire between ECT sensor 2-pin harness connector terminal "A" and PCM 30-pin harness connector terminal "1M"
• Open circuit in Brown wire between ECT sensor harness terminal "B" and PCM 30-pin harness connector terminal "2H"
• PCM malfunction
• Poor connection of ECT sensor or PCM connectors
• Short to power circuit between ECT sensor harness connector terminal "A" and PCM 30-pin harness connector terminal "1M"