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#1
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TCU diagnostics (POWER light and 16 blinks): how to perform correct diagnostics?
So I have read the steps to follow in order to do a TCU diagnostic from www.svx-iw.com:
"4.5.4 - Diagnostics The "Power" light indicates transmission codes. The following self diagnosis will show any fault codes for the transmission. To perform the self diagnostic test for EXISTING problems: 1. Warm up engine by driving at speeds greater than 12mph. 2. Stop vehicle and turn ignition switch OFF. 3. Turn ignition switch ON and make sure POWER indicator lamp comes on. 4. Turn ignition switch OFF. 5. Move selector lever to D and turn manual switch ON. 6. Turn ignition switch ON. 7. Move selector lever to "3" and turn manual switch OFF. 8. Move selector level to "2" and turn manual switch ON. 9. Move selector lever to "1" and turn manual switch OFF. 10. Partially depress accelerator pedal (to turn idle switch off). 11. Check code as displayed on POWER light. Blinking once every 1/4sec is normal. To perform the self diagnostic test for PREVIOUS problems: 1. Warm up engine by driving at speeds greater than 12mph. 2. Stop vehicle and turn ignition switch OFF. 3. Turn ignition switch ON and make sure POWER indicator lamp comes on. 4. Turn ignition switch OFF. 5. Move selector lever to "1" and turn manual switch ON. 6. Turn ignition switch ON. 7. Move selector lever to "2" and turn manual switch OFF. 8. Move selector lever to "3" and turn manual switch ON. 9. Move selector lever to "D" and turn manual switch OFF. 10. Partially depress accelerator pedal (to turn idle switch off). 11. Check code as displayed on POWER light. Blinking once every 1/4sec is normal. Trouble codes: * 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 * 25 - Engine torque control signal * 31 - Throttle sensor * 32 - Vehicle speed sensor 1 * 33 - Vehicle speed sensor 2" But I am missing something because I never get the codes. Is IGNITION ON as in the "ON" position or fully starting the car (which will not do if it's not either in NEUTRAL or PARK)? How would you clarify these instructions to get it right the first time? I am getting 16 warning blinks and I am trying to find out what's the problem. Thanks.
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Cars I've worked on: '05 Subaru Impreza STi, '02 Subaru Impreza WRX Wagon, '01 Toyota Celica GT, '98 Subaru Legacy GT 2.5 Sedan, '96 Isuzu Rodeo, '95 Jeep Cherokee 2WD, '94 Plymouth Sundance, '94 Subaru SVX LSi, '93 Subaru Impreza, '92 Subaru SVX LS-L, 2003 Subaru Baja. |
#2
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Re: TCU diagnostics (POWER light and 16 blinks): how to perform correct diagnostics?
It means in the on position, not started.
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Seth 94' Barcelona Red w/ Tricoat black 2-tone AWD Ls -Sold Mods:AWD conversion/4.44 swap by Budfreak, Custom red interior lights, Custom Satin black dash, Power mode switch, Cold air intake, Permecool tranny filter,Sony xplode 10" sub, Sony xplode 1000w amp, Blitz in-line driver, DDM Tuning 6000k HID's, New paint job/body work by me, 97' Grill, QC shift kit, 17'' MB Motoring rims, 15&20 min mod, front & rear urethane swaybar bushings, Custom fiberglass sub box, Custom red led a/c control unit, perrin lightweight crank pulley, Black wrinkle finish powdercoated intake manifold w/ clear hoses , 02' outback heated/power black leather seats Soon to come:Fiberglass hood, upholster ALL suede to black leather Past subies: 92' Pearl White/black top LS-L-SOLD 96' Legacy Outback-TOTALED 99' Legacy Outback Limited 30th anniversary edition-TOTALED 98' Forester L -Totaled Other toys: 99' Forester S -WRX brake upgrade, soon an 04 wrx motor swap 06' B9 Tribeca-Stock 1982' Yamaha xj650 Maxim Mods: work in progress |
#3
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Re: TCU diagnostics (POWER light and 16 blinks): how to perform correct diagnostics?
you may have a bad transmission resistor. Check near the battery to see if it's plugged in.
Have you installed the small car shift kit? |
#4
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Re: TCU diagnostics (POWER light and 16 blinks): how to perform correct diagnostics?
If you haven't might be better not to
![]() Keith ![]() |
#5
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Re: TCU diagnostics (POWER light and 16 blinks): how to perform correct diagnostics?
No shift kit on this one. Original resistor plugged in (I also tried with a 25W, 15-ohm one). I will try to post a video on the behavior of it.
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Cars I've worked on: '05 Subaru Impreza STi, '02 Subaru Impreza WRX Wagon, '01 Toyota Celica GT, '98 Subaru Legacy GT 2.5 Sedan, '96 Isuzu Rodeo, '95 Jeep Cherokee 2WD, '94 Plymouth Sundance, '94 Subaru SVX LSi, '93 Subaru Impreza, '92 Subaru SVX LS-L, 2003 Subaru Baja. |
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