B1 - Check For IDM at ICM

WARNING: Never connect the PCM to EEC breakout box when performing EI diagnostics.

^ Key off.

^ Install EI diagnostic harness to breakout box and to both the ICM and vehicle harness. Do not connect CKP sensor tee or coil tee.

^ Use EI 6 overlay.

^ Connect EI diagnostic harness negative and positive leads to battery.

^ Set EI diagnostic harness box type switch to 4/6 position.

^ DVOM on 20 volt AC scale.

^ Start engine and measure voltage between (+)J30 (EI diagnostic harness IDM detector) and (-)J7 (B-) at breakout box.

NOTE: If pulses are present, the IDM detector output will be between 5.0 and 7.0 volts AC.

^ Is AC voltage between 5.0 and 7.0 volts?

YES -- GO to B2. B2 - Check For IDM Open to Processor - IDM Fault

NO -- GO to B3. B3 - Check IDM Output From ICM - IDM Fault