P0730

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Circuit Description with 4T40-E / 4T45-E Automatic Transaxle
The PCM calculates gear ratio based on the transmission input and output speeds. The PCM compares the known transmission gear ratio to the calculated ratio for the selected gear range.

When the PCM detects an unknown transmission gear ratio, then DTC P0730 sets. DTC P0730 is a type C DTC.

CONDITIONS FOR RUNNING THE DTC
^ No TP sensor DTCs P0121, P0122, or P0123.
^ No VSS DTCs P0502 or P0503.
^ No AT ISS DTCs P0716 or P0717.
^ No TFP manual valve position switch DTC P1810.
^ The engine is running.
^ The TFP manual valve position switch is not indicating PARK or NEUTRAL.
^ The time since the gear select lever change is greater than 6 seconds.
^ The transmission fluid temperature is greater than 21°C (70°F).
^ The TP is greater than 15%.
^ The vehicle speed is greater than 8 km/h (5 mph).

CONDITIONS FOR SETTING THE DTC
One of the following conditions occurs for 7 seconds:
^ The gear ratio is greater than 3.13:1.
^ The gear ratio is 2.23:1 to 2.87:1.
^ The gear ratio is 1.71:1 to 2.02:1.
^ The gear ratio is 1.07:1 to 1.54:1.
^ The gear ratio is 0.72:1 to 0.91:1.
^ The gear ratio is less than 0.61:1.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM does not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM commands maximum line pressure.
^ The PCM freezes shift adapts from being updated.
^ The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Failure Records.
^ The PCM stores DTC P0730 in PCM history.

CONDITIONS FOR CLEARING THE DTC
^ A scan tool can clear the DTC.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS
^ Inspect for intermittent Automatic Transmission Input (shaft) Speed Sensor (AT ISS) circuit conditions.
^ Inspect for intermittent Automatic Transmission Output (shaft) Speed Sensor (AT OSS) circuit conditions.
^ Inspect for an incorrect calibration.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
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 gear ratios occur for commanded gears.
5. This step tests for low line pressure.