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The presence of the "Power" light on the lower dash panel blinking on/off 16 times at half-second intervals immediately after engine start-up indicates the TCU has recorded an error in the electronic system of the transmission. To discover the stored code, one must perform a sequence of steps to get the TCU in its diagnostic mode. Once in the diagnostic mode, the light will blink in a combination of long and/or short blinks, with a long blink = 10, short blink = 1. For example, if you observe 2 long blinks followed by three short blinks, that implies a code of 23. The code will either repeat, or display additional errors stored, until the ignition is turned off. The following method is used to enter the diagnostic mode for existing and previously recorded problems. Clearing the memory of the TCU is not supported, as the code is actually stored in the ECU memory.
To perform the self-diagnosis test for existing problems:
Warm up engine by driving at speeds greater than 12mph.
Stop vehicle and turn ignition switch OFF.
Turn ignition switch ON and make sure POWER indicator lamp comes on.
Turn ignition switch OFF.
Move selector lever to “D” and turn manual switch ON.
Turn ignition switch ON.
Move selector lever to "3" and turn manual switch OFF.
Move selector level to "2" and turn manual switch ON.
Move selector lever to "1" and turn manual switch OFF.
Partially depress accelerator pedal (to turn idle switch off).
Check code as displayed on POWER light. Blinking once every 1/4sec is normal.
To perform the test for previous (stored) problems:
Warm up engine by driving at speeds greater than 12mph.
Stop vehicle and turn ignition switch OFF.
Turn ignition switch ON and make sure POWER indicator lamp comes on.
Turn ignition switch OFF.
Move selector lever to "1" and turn manual switch ON.
Turn ignition switch ON.
Move selector lever to "2" and turn manual switch OFF.
Move selector lever to "3" and turn manual switch ON.
Move selector lever to "D" and turn manual switch OFF.
Partially depress accelerator pedal (to turn idle switch off).
Check code as displayed on POWER light. Blinking once every 1/4sec is normal.
TCU Error Code Table
Trouble Code Item
11 Duty solenoid A
12 Duty solenoid B
13 Shift solenoid 3
14 Shift solenoid 2
15 Shift solenoid 1
21 ATF temp sensor
22 Atmospheric sensor
23 Engine revolution signal
24 Duty solenoid C
31 Throttle sensor
32 Vehicle speed sensor 1
33 Vehicle speed sensor 2
if you want to know how to check component to verify the error code, look in my locker for part 1 of the tranny manual
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