Part 2 (above post to long to post at 1 time)
DIESEL ENGINE TDC OFFSET RELEARN PROCEDURES
This procedure should only be performed when one or more of the following has occurred:
1. A diagnostic trouble code of P1214 (TDC offset not established) is present.
2. The engine has been replaced.
3. The front engine cover has been replaced.
4. The PCM with or without the injection pump has been replaced.
5. The crankshaft position sensor has been replaced.
NOTE: Replacement of the only the injection pump does not require this procedure.
In order to initiate the relearn:
1. Hook up your scan tool.
2. Start the engine and idle engine until coolant temperature is at least 170 degrees F.
3. Clear any diagnostic trouble codes, if any. Then turn the engine off.
4. Turn the ignition switch to the “On” position. Do not start the engine.
5. Prepare the PCM to activate the offset relearn by placing and holding the accelerator pedal in the fully open position for no less than 45 seconds. Then release the pedal.
6. Turn the ignition switch to the “Off” position for 30 seconds. To confirm that the PCM has powered down, you should get a “No communication with vehicle” message on your scan tool.
7. Now start the engine and make sure that the coolant temperature is 170 degrees F or higher.
8. As soon as the engine coolant has reached 170 degrees F. and the engine speed is below 1500 RPM, the PCM will automatically learn the new TDC offset. A slight stumble in engine RPM is indicative that the new TDC has been activated.
9. Verify the TDC offset reading on your scan tool. The TDC offset should be between -0.25 and –0.75 degrees. If the TDC offset is within the specification, the relearn is completed. If the offset is out of specification then the injection pump must be adjusted. If the injection pump has not been replaced or adjusted and the TDC offset is very high on the positive side, then check for damage on the camshaft driven gear or key-way. If the TDC offset is very high on the negative side, check the crankshaft sensor for proper installation.
There is no relearn procedure other than to drive the vehicle. It is best to road test the vehicle, as the PCM will relearn the adaptive pressure shift points for proper transmission operation. The transmission may not shift as usual until the shift points have been learned. It is recommended that the first shift sequence be performed manually. Shift the transmission from low (first) gear to overdrive, one gear at a time, under moderate acceleration. If you turn the vehicle over to the customer without a road test, you may want to call this to their attention.