P1670 indicates that a communication error has occurred between the PCM and the IDM. Possible causes: -- Open fuse -- IDM relay -- Open or shorted IDM enable circuit -- Open/short in EF circuit -- Open/short in FDCS circuit -- IDM powering circuits -- PCM
P1280 indicates injector control signal circuit out of range low.
Possible causes: -- biased ICP sensor/PCM -- open ICP sensor circuit -- short to SIG RTN or PWR GND on ICP sensor circuit -- open in VREF circuit
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