How do you do a "TDC TIME SET" with an OTC Enhanced scanner with Pathfinder '97 ?

I've got a 94 6.5 VIN "s" and I can read the data fine but I can't find anything about resetting it ?

Anyway to do this or how do you rest it without a TECH 1 ?

Thank you, Tom

You loosen the three bolts holding the pump and rotate it to the driversside ~2.5mm and tighten. Then follow these instructions:

Controller Learn Procedures : TDC Offset

-= Page 1 =-

=== TDC Offset Learn Procedure (6.5L Diesel) ===

You must perform a TDC Offset learn procedure if any of the following have

been done or exist:

* Diagnostic Trouble Code (DTC) P1214.

* Engine has been replaced.

* Crankshaft position sensor or engine front cover has been replaced.

* Powertrain Control Module (PCM) and fuel injection pump have been

replaced.

NOTE: DO NOT perform procedure unless sent here from DTC P1214 or one

of the components listed above has been replaced.

1) The PCM has the ability to determine amount of offset required to bring

the engine to TDC when TDC offset is not present or has been cleared.

This procedure must be performed to allow PCM to be updated with the

correct TDC offset for vehicle application.

2) Install the Scan Tool on Data Link Connector (DLC). Start engine and

warm engine until engine coolant temperature is at least 170 Deg F.

Using the scan tool, clear DTCs from PCM. Turn ignition on with

engine off. Fully depress and hold throttle at full throttle for at

least 45 seconds.

3) Turn ignition off for 30 seconds. Start engine. Verify the scan tool

indicates TDC offset has been cleared to zero. If TDC offset has been

cleared to zero, go to next step. If TDC offset has not been cleared to

zero, repeat step 2) until TDC offset has been cleared to zero.

4) With engine running, use the scan tool to verify engine coolant

temperature is greater than 170 Deg F. It may be necessary to drive

vehicle to obtain correct engine coolant temperature if engine coolant

temperature is less than specified.

5) As soon at engine coolant temperature is greater than 170 Deg F (77 Deg

C) and engine speed is less than 1500 RPM, the PCM automatically learns

a NEW TDC offset. The NEW TDC offset will overwrite the previous TDC

offset. Using the scan tool, note NEW TDC offset. TDC offset should be

-.25 to -.75.

6) Shut engine off. If TDC offset is not within specification, go to next

step. If TDC offset is within specification, TDC offset learn procedure

is complete.

7) Using Flange Nut Wrench (J41089), loosen fuel injection pump retaining

nuts. Fuel injection pump must be rotated to change TDC offset. Rotating

fuel injection pump .039" (1.00 mm) will change TDC offset about 2

degrees. Rotating fuel injection pump toward driver's side of vehicle

will produce a positive (+) number and rotating fuel injection pump

toward passenger's side of vehicle will produce a negative (-) number.

8) Using Fuel Injection Pump Wrench (J 29872), slightly rotate fuel

injection pump. Tighten fuel injection pump retaining nuts.

9) Repeat step 2) through 8) until TDC offset is within specification. If

proper TDC offset cannot be obtained, check the following:

* Ensure engine coolant temperature is greater than 170 Deg F (77 Deg

C).

* Electric connectors at PCM are properly installed.

* Electric connectors at injection timing stepper motor on side of

fuel injection pump is correctly installed.

* Ensure latest Techline software was used.

* Check for proper base installation of fuel injection pump. The

electric engine shutoff solenoid on top of fuel injection pump

should be approximately straight up and down.

* Fuel injection pump may be defective, although manufacturer states

this is highly unlikely.

The Time Set Function is not available on OBDI trucks

Ok- Not available for OBDI trucks-

I was wondering how the heck you did it because I'm looking right in a big old Motor manual for 1994 Vin P,F, AND S VIN engine which I have and it says :

under injection pump timing-

1 :Start engine idle until warm.
2 :Connect Tech 1 scan tool or equivalent.
3 :Activate "TDC TIME SET" in "OUTPUT TEST/INJ PUMP" on Tech 1 scan tool. "DESIRED INJ TIM " will read zero.

4: If engine stalls rotate pump..... ect

So there is no need to 'reset' anything in the 1994 truck with the scanner,
after a CPS,or ECM replacement either like the manual says you do for OBDII, correct ?

Thanks again, Tom

Oh there is a need to reset it alright, and the procedure is basically the same, The TIME SET function is just a tool to help you get the pump close to right so you can successfully relearn TDC Offset.

So basicly I have to peform all the prementioned steps for the OBD II reset, except actualy going in to a TDC offset mode with a scanner.

This could be a problem, because of the hard starting I had, I replaced the CPS now it starts fine, but I belive the Injection Pump maybe on the way out.

I'm getting a code 18 and a 36- and I am I right to think the ECM will NOT do a relearn if there are ANY DTC's present- So if I clear them they will come right back before the engine is warm, and it will not 'reset'... am I getting close ?

Thanks

It does seem like the pump has issues with only 18 and 36 coming up on DTC's and yes it won't relearn without being DTC free. Hard starts also come into play with a code 36, the longer you have this problem the worse it gets 'till it will develop a surge that will scare the crap out of you.