P0730

Circuit Description
- The Powertrain Control Module (PCM) calculates the slippage of the converter and transmission based upon the engine speed, the output speed, and the current gear ratio.
- The slippage of the converter at a high enough engine speed is low. The transmission should not slip more than a given value when there is no shift.
- This DTC detects a slip at each gear. This is a type "C" DTC.

Conditions For Setting The DTC
- No Output Speed Sensor DTC(s) P0722, P0723.
- Not in Park, Neutral or Reverse.
- Engine speed is greater than 3500 rpm.
- 3 seconds since upshift.
- 3 seconds since downshift.
- 3 seconds since garage shift (N->D).
- And one of the following conditions occur:
- Slip is greater than 753 rpm in 1st gear.
- Slip is greater than 713 rpm in 2nd gear.
- Slip is greater than 694 rpm on 3rd gear.
- Slip is greater than 685 rpm on 4th gear.
- All conditions met for 5.5 seconds.

Action Taken When The DTC Sets
- Maximum line pressure.
- The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
- The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK TRANS Lamp
- The PCM will turn "oft" the CHECK TRANS Lamp after three consecutive ignition cycles without a failure reported.
- The DTC can be cleared from PCM memory by using a scan tool. The DTC can also be cleared from memory when the vehicle has made 40 warmup cycles without a failure reported.
- The PCM will cancel the DTC Actions Taken items when the fault conditions no longer exist and the ignition is cycles "off" long enough to power down the PCM.

Diagnostic Aids
- Check for intermittent output speed sensor circuit problems.
- Check for possible incorrect calibration. (PCM part No., tire specifications, and rear axle ratio)

Test Description
The numbers below refer to the step numbers on the diagnostic chart:
3. This step checks for possible low fluid level causing slipping resulting in an undefined gear ratio.
4. This step checks for correct gear ratios for commanded gears.
5. This step checks for low line pressure.








DTC P0730 Transmission Incorrect Gear Ratio