The TCM calculates gear ratio based on data from the automatic transmission input shaft speed and output shaft speed sensors. The TCM compares the known transmission gear ratio to a calculated ratio for each commanded gear.
If the TCM detects an incorrect 3rd gear ratio, indicating excessive slip or drag within the transmission, then DTC P0733 sets. DTC P0733 is a type C DTC.
• | No throttle system DTC P0120. |
• | No ISS DTCs P0716 or P0717. |
• | No OSS DTCs P0722 or P0723. |
• | No IMS DTCs P1815, P1820, P1822, P1823, P1825 or P1826. |
• | The engine run time is greater than 5 seconds. |
• | The transmission is not in PARK or NEUTRAL. |
• | The elapsed time since the most recent range change is greater than 6 seconds. |
• | The transmission fluid temperature is 20-130°C (68-266°F). |
• | The engine torque is greater than 55 N·m (41 lb ft). |
• | The throttle position is 10 percent or more. |
• | The gear ratio is between 0.61:1 and 4.14:1. |
• | The gear ratio is not Reverse: 3.1:1 to 2.95:1. |
• | The vehicle speed is greater than 5 km/h (3 mph). |
The TCM commands 3rd gear and the gear ratio is not within one of the following ranges for 3.5 seconds:
• | The gear ratio is not within 3.76:1 to 3.33:1 |
• | The gear ratio is not within 2.44:1 to 2.10:1 |
• | The gear ratio is not within 1.76:1 to 1.44:1 |
• | The gear ratio is not within 1.10:1 to 0.90:1 |
• | The gear ratio is not within 0.83:1 to 0.68:1 |
• | The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL). |
• | SERVICE TRANSMISSION displays on the driver information center (DIC). |
• | The TCM commands maximum line pressure. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record. |
• | The TCM stores DTC P0733 in TCM history. |
• | The TCM clears the DIC message when the condition no longer exists. |
• | A scan tool can clear the DTC. |
• | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring. |
• | The TCM cancels the DTC default actions when the ignition is OFF long enough in order to power down the TCM. |
Ask the customer about overloading the vehicle, exceeding the trailer towing limit, or towing in Overdrive.
The numbers below refer to the step numbers on the diagnostic table.
This step tests for low fluid level, which may cause slipping, and result in an incorrect gear ratio.
This step verifies that the correct 3rd gear ratio occurs for commanded 3rd gear. If necessary, use the Shift Transmission function of the scan tool in order to command 3rd gear for the length of time necessary to read the gear ratio from the display.
This step tests for low line pressure.
Step | Action | Value(s) | Yes | No | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Automatic Transmission? | -- | Go to Step 2 | |||||||||||||||||
2 |
Refer to Fluid Leak Diagnosis . Did you find and correct a condition? | -- | Go to Step 12 | Go to Step 3 | ||||||||||||||||
Perform the Transmission Fluid Checking Procedure. Refer to Transmission Fluid Check . Is the action complete? | -- | Go to Step 4 | -- | |||||||||||||||||
Important:
Is the 3rd gear ratio within the specified range? | 1.76:1-1.44:1 | Go to Intermittent Conditions in Engine Controls - 2.6L and 3.2L or Intermittent Conditions in Engine Controls - 3.6L (LY7) | Go to Step 5 | |||||||||||||||||
Perform the Line Pressure Check Procedure. Refer to Line Pressure Check . Is the action complete? | -- | Go to Step 6 | -- | |||||||||||||||||
6 |
Did you find excessive amounts of sediment? | -- | Go to Step 10 | Go to Step 7 | ||||||||||||||||
7 | Inspect for the following conditions:
Did you find any of the above conditions? | -- | Go to Step 9 | Go to Step 8 | ||||||||||||||||
8 | Has the control valve body been serviced within the past 3 months or 4 828 km (3,000 miles)? | -- | Go to Step 10 | Go to Step 9 | ||||||||||||||||
9 | Repair or replace the control valve body. Refer to Control Valve Body Accumulator Assembly Replacement . Is the action complete? | -- | Go to Step 12 | -- | ||||||||||||||||
10 | Inspect for the following conditions:
Refer to Intermediate Clutch Sprag Inspection in Transmission Unit Repair Manual. Did you find any of the above conditions? | -- | Go to Step 11 | -- | ||||||||||||||||
11 | Repair or replace the transmission. Refer to Transmission Replacement . Is the action complete? | -- | Go to Step 12 | -- | ||||||||||||||||
12 |
Refer to Automatic Transmission Fluid and Filter Replacement . Important: The Reset Transmission Adapts function will clear all adapt cells. This may affect transmission performance. The TCM will update the adapt cell values as the vehicle is driven. Did you complete the above procedures? | -- | Go to Step 13 | -- | ||||||||||||||||
13 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 14 | Go to Step 2 | ||||||||||||||||
14 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 2.6L and 3.2L or Diagnostic Trouble Code (DTC) List in Engine Controls - 3.6L (LY7) | System OK |