Diagnostic Trouble Codes (Full Version)

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Diagnostic Trouble Codes

  

BigPapaPump37 -> Diagnostic Trouble Codes (3/24/2008 3:58:41 PM)

Hello all, been to long since I've been on, just got back from the big sandbox over seas.

Anyways, I was driving today and decided to get on from a dead stop.  Well, the tranny went through a couple of shifts, speed wasn't all that high, I then backed off, stepped on the gas again, rpms went up, but no power.  I backed off, tranny shifted down once and everything was fine, then the check engine light came on.  My neighbor came home, happens to be a ford mechanic, plugged into the port and got a trouble code of P0730, Incorrect Gear Ratio.

My question is has anyone had this happen to them.

Since it has been so long, I'm in 07 R/T model.

Any help would be great, neighbor doesn't think it is a big problem, because we cleared the code and took it out and did the exact samething and didn't have any problems.

Thanks to all.

  
MangoInTX -> RE: Diagnostic Trouble Codes (3/25/2008 8:37:51 AM)

Some others have seen this exact issue and believe it's a Transmission Control Module TCM code problem.   As long as it doesn't reocure I would agree it's a fluke and you should worry about it.

Info from another forum...

quote:

P0730-INCORRECT GEAR RATIO

Theory of Operation

The Transmission Control Module (TCM) constantly calculates the transmission ratio based on the input speed sensor
1 and 2 (N2-N3) signals and the calculated output shaft speed. The intent of this diagnostic is to detect if the
transmission is trying to mechanically shift INTO a lower gear then the TCM intends.
² When Monitored:
Engine RPM greater than 450 RPM, output speed greater than 180 RPM, no N2 - N3 input speed sensor
errors present, no gear selector lever errors present, no ABS system errors, and all wheel speeds above 450
RPM.
² Set Condition:
No shifting operation and detected gear is not the actual gear. No shifting operation - detected (calculated)
gear is less than actual (expected) gear, no plausible gear is calculated, actual turbine speed - calculated turbine
speed is greater than 300 RPM or calculated transmission ratio is above threshold. During an Upshift -
detected (calculated) gear is less than actual (expected) gear. During Downshift - detected (calculated) gear is
less than actual (expected) gear.

Possible Causes

INTERNAL TRANSMISSION PROBLEM
TRANSMISSION CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - NAG1 - DIAGNOSIS AND TESTING)


BigPapaPump37 -> RE: Diagnostic Trouble Codes (3/26/2008 3:36:24 AM)

Mango,

As always, your the man.  Haven't had any problems since, plus I really didn't want to have to go and spend 4 hours at the dealership and pay for something that wasn't a real problem.

  

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