DTC P0729 / P0731 / P0732 / P0733 / P0734 / P0735 / P074A / P074B / P074C / P074D / P074E

Precautions: Precautions for Diagnosing Trouble · Precautions for Disassembly and Reassembly · Precautions for Transmission / Transaxle · General safety (00)

DTC Detecting Condition and Trouble Area

DTC detecting condition	Trouble area
P0729: Gear 6 Incorrect Ratio 6th gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)	•Line pressure control solenoid valve •Pressure control solenoid valve “A”, “B”, “C” and “D” •Shift solenoid valve “A” •Valve body assembly •A/T (forward clutch, direct clutch, reverse clutch and/or B1 brake) •TCM
P0731: Gear 1 Incorrect Ratio 1st gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P0732: Gear 2 Incorrect Ratio 2nd gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P0733: Gear 3 Incorrect Ratio 3rd gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P0734: Gear 4 Incorrect Ratio 4th gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P0735: Gear 5 Incorrect Ratio 5th gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P074A: Unable To Engage Gear 2 2nd gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P074B: Unable To Engage Gear 3 3rd gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P074C: Unable To Engage Gear 4 4th gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P074D: Unable To Engage Gear 5 5th gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)
P074E: Unable To Engage Gear 6 6th gear commanded by TCM does not match the actual gear when driving. (2 D/C detection logic)

DTC Confirmation Procedure

WARNING:

If you do not select a suitable route and take proper precautions when performing a road test, an accident can occur.

•Select a level road with no traffic to minimize the risk of accident.
•Perform the test extremely carefully.
•Perform the road test using 2 persons, a driver and a tester.

NOTE:

•Check that the following conditions are met in this “DTC Confirmation Procedure”.

—DTC P0717, P0722, P1736, P1737, P1738, P1739, U0073 or U0100 is not detected.
—ECM: DTC P0335 is not detected.

•Troubleshoot first unexpected DTCs previously detected in “DTC Confirmation Procedure”.

1)Warm up engine to normal operating temperature.

2)Drive vehicle in each gear of D range for 5 minutes. (Keep accelerator pedal position at 10% or more.)

DTC Troubleshooting

Step	Action	Yes	No
1	Was “A/T Control System Check” performed?	Go to Step 2.	Go to A/T Control System Check.
2	ATF check 1)Check ATF for level and deterioration. Is check result OK?	Go to Step 3.	Refill or change ATF.
3	Line pressure check 1)Check applicable line pressure as shown in the following table. Is check result OK?	Go to Step 4.	Repair or replace defective parts.
4	Solenoid valve check 1)Remove valve body assembly. 2)Check applicable solenoid valve for proper operation as shown in the following table. Is check result OK?	Go to Step 5.	Replace valve body assembly.
5	Valve body check 1)Check that each fluid passage is not clogged in valve body assembly. Is check result OK?	Check A/T mechanical systems (clutch, brake or gear etc.) If OK, substitute a known-good TCM and recheck DTC.	Clean or replace valve body assembly.

Table for Step 3 (Line pressure check)

DTC	Line pressure
DTC	C1	C2	C3	B1	B2
P0729
P0731
P0732
P0733
P0734
P0735
P074A
P074B
P074C
P074D
P074E

Table for Step 4 (Solenoid valve check)

DTC	Line pressure control solenoid valve	Shift solenoid valve	Pressure control solenoid valve
DTC	Line pressure control solenoid valve	A	A	B	C	D
P0729
P0731
P0732
P0733
P0734
P0735
P074A
P074B
P074C
P074D
P074E