DTC 212

miesk5

96 Bronco 5.0
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CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODE (DTC) 212: CHECK IDM CIRCUIT CONTINUITY


  • Key off.
  • Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
  • Install breakout box, leave PCM disconnected.
  • Disconnect Ignition Control Module (ICM).
  • Measure resistance between Test Pin 4 at the breakout box and IDM circuit at the ICM vehicle harness connector.
Is resistance less than 5.0 ohms?


Yes


No


GO to NA5.


SERVICE open circuit. REMOVE breakout box. RECONNECT PCM. CLEAR Continuous Memory. RECONNECT all components. RERUN Quick Test.






NA5 CHECK IDM CIRCUIT FOR SHORTS TO POWER (EXCLUDING VREF)


  • Key off.
  • Breakout box installed.
  • PCM and ICM disconnected.
  • Measure voltage between Test Pin 4 at the breakout box and battery negative post.
  • Key on, engine off.
  • Measure voltage between Test Pin 4 and Test Pins 40 and 60 at the breakout box.
Is any voltage reading greater than 10.5 volts?


Yes


No


SERVICE short circuit. REMOVE breakout box. RECONNECT all components. RERUN Quick Test.


GO to NA6 .






NA6 CHECK IDM CIRCUIT FOR SHORTS TO VREF AND PIP


  • Key off.
  • Breakout box installed, PCM disconnected.
  • ICM disconnected.
  • Ignition coil disconnected on Non-CCD vehicles (refer to Pinpoint Test Schematic ).
  • Disconnect Scan Tool from Data Link Connector (if applicable).
    Note: For proper results of this test, the Scan Tool must be disconnected. Due to the circuitry of the Scan Tool and the vehicle, voltage can be fed to the VREF circuit giving a false indication of a short to power.


    For Shorts To VREF:


    Measure resistance between Test Pin 4 and Test Pin 26 at the breakout box.

[*]For Shorts To PIP circuit:

  • Measure resistance between Test Pin 4 and Test Pin 56 at the breakout box.


Is each resistance greater than 10,000 ohms?


Yes


No


GO to NA7 .


SERVICE short circuits. REMOVE breakout box. RECONNECT all components and SCAN Tool (if applicable). RERUN Quick Test.






NA7 CHECK IDM CIRCUIT FOR SHORT TO GROUND


Note: During this check when 4-wire HO2S is connected to the vehicle harness on DI vehicles, a short to SIG RTN (Pin 46) may be indicated in conjunction with an actual PWR GND short.

  • Key off.
  • Breakout box installed, PCM disconnected.
  • ICM disconnected.
  • Scan tool disconnected from Data Link connector.
  • Ignition coil disconnected on Non-CCD vehicles (refer to Pinpoint Test Schematic ).
  • Measure resistance between Test Pin 4 and Test Pins 20, 40, 46 and 60 at the breakout box.
Is each resistance above 10,000 ohms?


Yes


No


RECONNECT Scan Tool. GO to NA8 .


REMOVE breakout box. SERVICE short to ground in IDM circuit. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.






NA8 CHECK ICM


  • Key off.
  • Breakout box installed.
  • Connect PCM to breakout box.
  • Reconnect ignition coil and ICM.
  • Connect DVOM between Test Pin 4 and Test Pin 16 at the breakout box.
  • Start engine.
  • Observe DVOM when voltage is allowed to stabilize.
  • Lightly tap on ICM to simulate road shock.
  • Wiggle ICM connector (for 3.8L AX4S, 3.8L RWD, 3.0L, 7.0L and 7.5L Trucks, wiggle ICM, GCM and CMP sensor connectors).
  • A sudden change in voltage indicates a fault.
Is a fault indicated?


Yes


No


DISCONNECT and INSPECT connectors. If connector and terminals are good, REMOVE breakout box, RECONNECT all components and REFER to Section 8A , DI Diagnostics (2.0L Probe, Section 8B).


GO to NA9 .






NA9 CHECK EEC HARNESS


  • DVOM still connected between Test Pin 4 and Test Pin 16 at the breakout box.
  • Key on, engine running.
  • While observing a voltage change as in NA8 , perform the following:

    Grasp vehicle harness closest to ICM connector (for 3.8L AX4S, 3.8L RWD, 3.0L, 7.0L and 7.5L trucks, wiggle ICM, GCM and CMP sensor connectors). Shake and bend a small section of the EEC harness while working toward the dash panel. Also wiggle, shake and bend the EEC harness from dash panel to PCM.

Is a fault indicated?


Yes


No


ISOLATE fault and SERVICE as necessary. REMOVE breakout box. RECONNECT all components. CLEAR Continuous Memory. RERUN Quick Test.


GO to NA10.






NA10 CHECK PCM AND HARNESS CONNECTORS


  • Key off.
  • Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc.
Are connectors and terminals OK?


Yes


No


GO to NA11 .


SERVICE as necessary. REMOVE breakout box. RECONNECT all components. CLEAR Continuous Memory. (REFER to Quick Test Appendix, Section 5A .) RERUN Quick Test.






NA11 CHECK PCM FOR SHORT TO POWER


  • Key off.
  • Breakout box installed.
  • PCM connected to breakout box.

    For vehicles with Remote Mounted ICM and Camshaft Position (CMP) sensor:

    Disconnect ICM and CMP.

[*]7.0L Truck:

  • Also disconnect Governor Control Module (GCM).

[*]All others:

  • Disconnect ICM.


[*]Measure voltage between Test Pin 4 and chassis ground.

[*]Key on, engine off.

[*]Measure voltage between Test Pin 4 and Test Pins 40 and 60 at the breakout box.

Is any voltage reading greater than 10.5 volts?


Yes


No


REPLACE PCM. REMOVE breakout box. RECONNECT all components. RERUN Quick Test.


GO to NA12 .






NA12 CHECK PCM FOR SHORT TO GROUND


  • Key off.
  • Breakout box installed.
  • PCM connected to breakout box.
  • Ignition coil (Non-CCD only), ICM and CMP sensor disconnected.
  • Measure resistance between Test Pin 4 and Test Pins 40, 46 and 60 at breakout box.
Is each resistance greater than 10,000 ohms?


Yes


No


REMOVE breakout box. RECONNECT all components. For further diagnosis, REFER to Section 8A , DI Diagnostics (Probe, Section 8B).


REPLACE PCM. REMOVE breakout box. RECONNECT all components. RERUN Quick Test.

 
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