98 Explorer xlt v8 2w -? Regarding chk eng light

[Chels520]

I received a couple check engine codes...one was o2 sensors.(replaced-code fixed)
2nd code was misfire. (replaced spark plugs). Friend who replaced said plugs needed replacing, bad gap, but were "tan" & wires looked good & didn't think they needed replacing.- code fixed!
After all that, I got the folowing code:
P1309
Misfire monitor disabled,
Verify cam sensor is synched,
ECM failure,
Verify input sensor parameters are correct.
We replaced the cam sensor & light came back on. Friend is thinking it could be the computer. Just wondering if anybody had suggestions or had similar problem. Thank you!

 

[jremington59]

This is right out of the Ford shop manual........ Did your friend have a synchronization tool?


HD40 CHECK CMP SENSOR OUTPUT

Diagnostic Trouble Code (DTC) P1309 indicates Misfire Detection Monitor is not enabled.

Breakout box installed, PCM disconnected.
Connect digital multimeter between PCM test pin 85 and test pins 51 or 103.
Bump engine in short burst with the starter without starting engine for at least 10 engine revolutions.
Does digital multimeter reading switch between low (less than 2.0 volts DC) and high (greater than 8.0 volts DC)?

Yes
Note: A Hall effect type CMP sensor that is installed out of synchronization will produce a DTC. VERIFY the correct installation by referring to the Powertrain/Engine Group in the Workshop Manual. If the CMP is installed properly, REPLACE PCM. RESTORE vehicle. RERUN Quick Test .

No
REPLACE CMP sensor. RESTORE vehicle. COMPLETE Misfire Monitor Repair Verification Drive Cycle

 

[2000StreetRod]

must relearn

If the camshaft position (CMP) sensor or crankshaft position (CKP) sensor has been replaced and the keep alive memory (KAM) has been erased due to removal of battery power then the misfire monitor software must relearn the corrections for the mechanical inaccuracies in the crankshaft tooth spacing. The misfire detection monitor is disabled until the profile corrections are relearned. The profile corrections are learned during closed throttle decelerations from above 60 mph to 40 mph with no braking applied. It may take up to 3 decelerations for the profile corrections to be relearned.

I suggest that you warm up the engine and then perform the three decelerations described above prior to replacing the PCM.

 

[Chels520]

Thank you! I will try these out!

 

[2000StreetRod]

progress report?

Do you have any progress to report on your DTC? Did it go away?