Mechanics

OBD II CODES P0730 AND P0740

1999 Honda CRV

Transmission problem
1999 Honda CRV 4 cyl Two Wheel Drive Automatic

my Honda CRV all of a sudden decided to shift into neutral. No matter what I shifted it in it was still in neutral. After turning it off and back on I could drive a few tenths of a mile before it shifted itself back into neutral. I changed out a near dead battery and drove it 35 miles before it did it again. I thought I fixed it. What next?
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Marty Kunard
November 1, 2010.



Hi Marty Kunard,

Here are the diagnostic procedures.

DTC P0730/FLASH CODE 41: SHIFT CONTROL SYSTEM (1998-99 MODELS)

1. Using scan tool, retrieve A/T freeze data. Clear fault codes and road test vehicle under same conditions freeze data was recorded. If fault code resets, go to next step. If fault code does not reset, problem is intermittent, check transaxle and PCM connections.

2. Road test vehicle at greater than 12 MPH for more than 30 seconds in 2nd, 3rd and 4th gear. Using scan tool, check for any other DTC. If no other DTC are present, go to next step. If any other DTC are present, repair those DTC first, then recheck for DTC P0730/FLASH CODE 41.

3. Test clutch pressure. If clutch pressure is within
specification, go to next step. If clutch pressure is not within specification, repair hydraulic system as necessary.

4. Replace linear solenoid valve assembly and shift control solenoid valves " A" and " B" assembly. Turn ignition off. Clear codes. Road test vehicle at greater than 12 MPH for more than 30 seconds in 1st, 2nd, 3rd and 4th gear. Recheck DTC. If DTC P0730/FLASH CODE 41 resets, replace transaxle. If DTC P0730/FLASH CODE 41 does not reset, system is okay.

DTC P0740/FLASH CODE 40: LOCK-UP CONTROL SYSTEM (1998-99 MODELS)

1 Using scan tool, retrieve A/T freeze data. Clear fault codes and road test vehicle under same conditions freeze data was recorded. If fault code resets, go to next step. If fault code does not reset, problem is intermittent, check transaxle and PCM connections.

2. Using scan tool, check for any other DTC. If no other DTC are present, go to next step. If any other DTC are present, repair those DTC first, then recheck for DTC P0740/FLASH CODE 40.

3. Test line pressure. If line pressure is within
specification, go to next step. If line pressure is not within specification, repair hydraulic system as necessary.

4. Test clutch pressure. If clutch pressure is within specification, go to next step. If clutch pressure is not within specification, repair hydraulic system as necessary.

5. Replace lock-up control solenoid valves " A" and " B" assembly. Turn ignition off. Clear codes. Road test vehicle at greater than 55 MPH for more than one minute. Recheck for DTC. If DTC P0740/FLASH CODE 40 resets, replace transaxle and torque converter. If DTC P0740/FLASH CODE 40 does not reset, system is okay.

KHLow2008
Nov 2, 2010.