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Home >> Ford >> 1996 >> Probe Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - EEC-IV (2.0L) >> Ignition System >> Pinpoint Test B - Code 212: IDM Failure
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Pinpoint Test B - Code 212: IDM Failure

  1. Check For IDM Signal At ICM  With ignition off, connect diagnostic cable to breakout box and ICM. DO NOT connect CKP sensor tee. Use EI (High Data Rate) 4 overlay on breakout box. Connect diagnostic cable negative and positive leads to battery. Set diagnostic cable box switch to 4/6 CYLINDER position. Set DVOM on AC voltage scale. Start engine and measure voltage between J30 (diagnostic cable IDM DETECTOR) and J7 (B-) at breakout box. If AC voltage is 5-7 volts, go to next step. If voltage is not 5-7 volts, go to step 3).
  2. Check For IDM Open  With ignition off, disconnect PCM. Disconnect ICM from ICM tee. Leave diagnostic cable connected to wiring harness connector. Connect a second breakout box to PCM harness connector. Set DVOM on ohm scale. Measure resistance between J41 (IDM I) at breakout box and pin No. 4 at second breakout box. If resistance is less than 5 ohms, replace PCM. If resistance is 5 ohms or more, repair open in IDM circuit.
  3. Check IDM Output From ICM  With ignition off, set DVOM on AC voltage scale. Push and hold down IDM button at diagnostic cable connector (this opens IDM circuit to PCM). Start engine and measure voltage between J30 (diagnostic cable IDM DETECTOR) and J7 (B-) at breakout box. If AC voltage is more than 5 volts, go to next step. If AC voltage is 5 volts or less, replace ICM (no IDM output from module).
  4. Check For IDM Short In PCM (PCM Disconnected)  With ignition off, disconnect PCM. Crank engine and measure voltage between J30 (diagnostic cable IDM DETECTOR) and J7 (B-) at breakout box. If AC voltage is more than 5 volts, replace PCM. If AC voltage is 5 volts or less, go to next step.
  5. Check For IDM Short To Power In Harness  Turn ignition off. Ensure ICM and PCM are disconnected. Set DVOM on DC voltage scale. Turn ignition on. Measure voltage between J41 (IDM I) and J7 (B-) at breakout box. If voltage is less than 0.5 volt, go to next step. If voltage is 0.5 volt or more, repair IDM circuit for a short to power.
  6. Check For IDM Short To Ground  Turn ignition off. Disconnect ICM from diagnostic cable module tee. Leave diagnostic cable connected to wiring harness connector. Set DVOM on 20-k/ohm scale. Measure resistance between J41 (IDM I) and J7 (B-) at breakout box. If resistance is more than 10 ohms, IDM is shorted to another circuit in wiring harness between ICM and PCM. If resistance is 10 ohms or less, IDM is shorted to ground. Repair or replace wiring as necessary.
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