P0730

Circuit Description with 4L30-E Automatic Transmission
The TCM uses engine speed, transmission output speed, TCC status, and current gear in order to determine if excessive component slippage is occurring.

When the TCM detects an increase in RPM for a particular gear above a predetermined amount, then DTC P0730 sets. DTC P0730 is a type B DTC.

CONDITIONS FOR RUNNING THE DTC
^ The engine is running.
^ The gear position is not P, R, N.
^ The transmission is not in safety mode.
^ The enabling conditions for DTC P0757 fail 1 case are not met.

All the above conditions are met plus one of the following conditions:

Condition 1
The engine speed has not exceeded 3,488 RPM.

Condition 2
Engine and transmission output speed has not exceeded 2,976 RPM in 3rd gear.

CONDITIONS FOR SETTING THE DTC

Condition 1
Absolute slippage that is calculated by the TCM is greater than the following predetermined amount:
^ Commanded gear is 1st and the transmission output speed is greater than 352 RPM for 4.0 seconds.
^ Commanded gear is 2nd and the transmission output speed is greater than 576 RPM for 4.0 seconds.
^ Commanded gear is 3rd and the transmission output speed is greater than 896 RPM for 4.0 seconds.
^ Commanded gear is 4th and the transmission output speed is greater than 1,216 RPM for 4.0 seconds.

Condition 2
Engine and transmission output speed is less than 992 RPM in 3rd gear for 4.0 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ The TCM flashes the sport mode lamp and sends a MIL request to the ECM on the second consecutive drive trip that the diagnostic runs and fails. The ECM then illuminates the MIL.
^ The ECM records the operating conditions in the Freeze Frame at the time of the MIL request from the TCM.
^ The transmission operates in the default mode (maximum line pressure, command 4th gear, inhibit TCC, freeze shift adapts).

Conditions For Clearing the MIL/DTC
^ The ECM turns off the MIL after three consecutive drive trips during which the TCM sends no MIL request.
^ A History DTC clears after forty consecutive warm-up cycles, if no failures are present by this diagnostic or any other emission related diagnostic.
^ The scan tool clears the MIL/DTC.
^ The TCM cancels the DTC default mode actions when the ignition switch is off long enough in order to power down the TCM.

DIAGNOSTIC AIDS
^ A DTC P0722 could cause DTC P0730 to set falsely.
^ Inspect for intermittent Automatic Transmission Output (shaft) Speed Sensor (AT OSS) circuit conditions.
^ Sticking or contamination of shift valves may cause intermittent incorrect gear ratios. Refer to Range Reference.

TEST DESCRIPTION

Steps 1 - 8:

Steps 9 - 10:

The numbers below refer to the step numbers on the diagnostic table.
2. A condition in the Output Speed Sensor Circuit can cause this DTC to set. Perform that diagnostic procedure first.
3. This step tests for low fluid level, which may cause slipping, and result in an incorrect gear ratio.
4. This step verifies that the correct output speeds occur for commanded gears.
5. This step tests for low line pressure.