Acura / Honda transmission. Manual — part 30

This book is based on the "Automotive Transmission Troubleshooter" software by the

same author. All similarities to this software package are intended. Both of these
products are copyrighted by the author, Mandy Concepcion. For further insight on

automotive transmissions please see our complementary DVD-Video.

Section: Acura/Honda Shifting Truth-Tables (shifting truth
tables or shifting combination)

IMPORTANT: The transmission truth table allows you to be able to
manually shift the unit. This is done to determine if your non-shifting
trans is due to a mechanical /hydraulic problem or damage circuit,
such as an electronic/sensor open-short ckt. If you're able to manually
shift the transmission, then you know that a rebuild is not going to
repair the vehicle. If this is so, then concentrate on diagnosing the
electrical/electronic fault.

To manually shift the transmission, apply ground to the shift solenoids
in the combination seen in the truth-table. If the transmission is stuck
in one gear (limp-in mode 2nd or 3rd) then there's hydraulic pressure
and the transmission should manually shift. If it doesn't shift then the
fault in internal to the trans. Double check and make sure the shift sol.
have power at the ECM/TCM wire. This means that the Ckt is not open
(broken). As a final step, intermittently apply ground to the shift sol.
and listen for a clicking noise. This will tell you that the solenoid is
working, however, it may still be clogged. Technicians have used an
injector pulser to apply a series of fast pulses to break the sludge or
particles free of the solenoid.

IMPORTANT: Some units may show 3 or 4 shift solenoids.
However, not all solenoids are covered on the Truth-Table. The
Truth-Table only covers those solenoids that are needed to
manually shift the transmission.

4L30E

4L30-E Shift Solenoid Truth Table

Shift 1-2/3-4 Shift Sol 2-3

1st Gear - OFF ON

2nd Gear - ON ON

3rd Gear - ON OFF

4th gear - OFF OFF

B7TA/B7YA

B7TA/B7YA Shift Solenoid Truth Table

Shift Sol A Shift Sol B Shift Sol C

1st Gear - OFF ON ON

2nd Gear - ON ON OFF

3rd Gear - ON OFF ON

4th Gear - OFF OFF OFF

BAXA

BAXA Shift Solenoid Truth Table

Shift Sol A Shift Sol B Shift Sol C

1st Gear - OFF ON ON

2nd Gear - ON ON OFF

3rd Gear - ON OFF ON

4th Gear - OFF OFF OFF

BGRA

BGRA Shift Solenoid Truth Table

Shift Sol A Shift Sol B Shift Sol C

1st Gear - ON ON ON

2nd Gear - ON ON OFF

3rd Gear - OFF ON ON

4th Gear - OFF OFF OFF

5th Gear - ON OFF ON

BMXA/SLXA

BMXA/SLXA Shift Solenoid Truth Table

Shift Sol A Shift Sol B

1st Gear - OFF ON