P0730

P0730-INCORRECT GEAR RATIO

For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

Theory of Operation

The Transmission Control Module (TCM) constantly calculates what the output shaft speed should be in any given gear based on the input speed sensor, output speed sensor and the current gear state.

When Monitored:
- Output rpm is greater than 250 rpm, Transmission is in Drive, no electrical DTCs present, transmission not currently in a gear shift.

Set Condition:
- If the calculated ratio does not match the predetermined ratio for the current gear for more than 2.5 seconds, this DTC will set.






Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Testing and Inspection.

CHECK FOR INTERNAL TRANSMISSION PROBLEM
1. Determine if there are any Transmission mechanical problems present.
2. Remove the Transmission Oil Pan and inspect for excessive debris or a plugged Transmission Oil Filter.
3. Inspect valve body for foreign material.

Is there any Transmission mechanical problems present?

Yes

- Repair as necessary.
- Perform AS68RC TRANSMISSION VERIFICATION TEST AS68RC Transmission Verification Test.

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.
- Perform AS68RC TRANSMISSION VERIFICATION TEST AS68RC Transmission Verification Test.