P0735-GEAR RATIO ERROR IN 5TH

For a complete wiring diagram Refer to Section 8W

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 slipping or an invalid gear ratio is present.


  • 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.

  • 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
  
LOW TRANSMISSION FLUID
  
OTHER TRANSMISSION DTCS PRESENT
  
INTERNAL TRANSMISSION FAILURE
  

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)



Diagnostic Test

1.CHECK FOR OTHER TRANSMISSION DTCS



Are there any solenoid and/or solenoid supply voltage DTCs present?

Yes
  • Refer to the symptom list and perform the appropriate symptom(s).


No
  • Go To 2

2.CHECK TRANSMISSION FLUID LEVEL

NOTE: Low fluid level can be the cause of many transmission problems. Visually inspect the transmission and cooler lines for leakage and repair as necessary and adjust the fluid level per the Service Information. If no visual leaks are observed and the vehicle has obtained over 1610 km (1000 miles) from either new or transmission service, a fluid level check is unnecessary.


(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1/FILTER - STANDARD PROCEDURE)

Is the fluid level correct?

Yes
  • Go To 3


No

3.CHECK IF DTC IS CURRENT


NOTE: If the TCM detects and stores a DTC, the TCM also stores the vehicles operating conditions under which the DTC originally set and is located in scan tool under Environmental Data. Before erasing any stored DTCs, record any available data to assist in duplicating the conditions in which the DTC originally set.





Did the DTC P0735-GEAR RATIO ERROR IN 5TH reset?

Yes


No
  • Go To 4

4.INTERMITTENT WIRING AND CONNECTORS






Were there any problems found?

Yes


No
  • Test Complete.