NA3 - Check For IDM at ICM - KOER

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 tees.

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

- Use EI 8 overlay.

- Set EI diagnostic harness type switch to "8" position.

- DVOM on 40 volt AC scale.

- Do not use an incandescent test lamp to check IDM. The lamp will prevent the circuit from operating.

- 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 NA4. NA4 - Check For IDM Open to PCM - IDM Fault

NO -- GO to NA5. IDM fault. NA5 - Check IDM Output From ICM - IDM Fault - IDM Circuit Open