TCU Codes (Automatic Transmissions) DSMs

Here are the codes for the TCU. These can be obtained by using the same principal for pulling the ECU codes.

I use a multimeter and 2 wires with alligator clips. You can get the clips from Radio Shack or wherever.

Hook up to pins and Set the mulitmeter for 12 V. Turn the key all the way but do not crank (the power windows work in this position). Watch the pulses of the needle (if Analog). Write down L for long and S for short. The TCU will cycle the codes over and over. So you can double check them if needed. If you get constant short pulses, the TCU has no codes and all is well (so it would seem).

Once you write it down, figure L = 10 and S = 1. EX: L-L-S-S=22. GO to the chart below and it will tell you what the code means.

The left is the 1G Diagnostic plug. The right is the 2G. Red is you hook up the Positive lead of the Meter and Gray is Negative. If it does not work or read, try reversing the leads.

1G hook POS to #6 and NEG to #12.>>>>>>>>>>>>>> 2G POs to #6 and NEG to #4.

11
Excessive Large TPS (Throttle Position Sensor) output.
12
Excessive Small TPS output
13
Defective or improperly adjusted TPS
14
TPS adjusted improperly
15

Open circuited low-oil-temp sensor <1992 and 1993>
16
Short Circuited High -oil-temp-sensor <1992 only>
17
open circuited high temp sensor or short circuited low oil-temp-sensor <1992 only>
21
Open-Circuited Kickdown Servo
22
Short-circuited Kickdown Servo
23
Open-Circuited Ignition pulse pickup cable
24
Open-Circuited or improperly adjusted accelerator switch <1992 Only>
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31
Open-Circuited pulse generator A
32
Open-Circuited pulse generator B
41
Open-Circuited shift control solenoid valve A
42
Short -Circuited shift control solenoid valve A
43
Open-Circuited shift control solenoid valve B
44
Short-circuited shift control solenoid valve B
45
Open-Circuited shift control Pressure Control Solenoid valve
46
Short-circuited shift control Pressure Control Solenoid valve
47
Open-Circuited torque converter clutch solenoid
48
Short-circuited torque converter clutch solenoid
49
Defective torque converter clutch system
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51
1st Gear Incorrect Ratio
52
2nd Gear Incorrect Ratio
53
3rd Gear Incorrect Ratio
54
4th Gear Incorrect Ratio
61
Short or Open-Circuited torque reduction request or execution signal line
62
Open-circuited torque reduction request line
63
Short-circuited torque reduction execution line
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81
Open-circuited Pulse Generator A
82
Open-circuited Pulse Generator B
83
Open or Short-circuited Shift Control Solenoid valve A
84
Open or Short-circuited Shift Control Solenoid valve B
85
Open or Short-circuited Pressure Control Solenoid valve
86
Incorrect gear ratio

Actions: Things to check

Codes (11-14)

  • Check TPS Connector
  • Adjust TPS
  • Check TPS
  • Check accelerator switch (Code 24)

Codes (15-17)

  • Check Oil Temp. Sensor Connector
  • Check Oil Temp. sensor on bench

Codes (21,22)

  • Check Kickdown servo switch connector and Kickdown switch on bench

Code (23)

  • Check Ignition Pulse Signal Line.

Code (24)

  • Check & Adjust Accelerator Switch & Connector

Codes (31,32)

  • Check Pulse Generator A or B
  • Check vehicle reed switch (chattering)

Codes (41,42)

  • Check Solenoid Valve connector
  • Check Shift control solenoid valve A

Codes (43,44)

  • Check Solenoid Valve connector
  • Check Shift control solenoid valve B

Codes (45,46)

  • Check Solenoid Valve connector
  • Check Pressure Control Solenoid Valve

Codes (47,48)

  • Check Solenoid Valve connector
  • Check Torque Converter Clutch Solenoid

Code (49)

  • Check Torque Converter Clutch Hydraulic Unit
  • Check Torque Converter Clutch Solenoid
  • Replace Control Unit

Code (51)

  • Check Connectors of Pulse Generators A and B and the generators themselves
  • Rear Clutch Slipping

Code (52)

  • Check Connectors of Pulse Generators A and B and the generators themselves
  • Rear Clutch Slipping
  • Kickdown Brake Slipping

Code (53)

  • Check Connectors of Pulse Generators A and B and the generators themselves
  • Front Clutch Slipping
  • Rear Clutch Slipping

Code (54)

  • Check Connectors of Pulse Generators A and B and the generators themselves
  • End Clutch Slipping
  • Kickdown Brake Slipping

Code (61)

  • Check Torque Reduction Request Signal Line
  • Check Torque Reduction Execution Signal Line

Code (62)

  • Check Torque Reduction Request Signal Line

Code (63)

  • Check Torque Reduction Execution Signal Line
Code (81) See related code (31)
Code (82) See related code (32)
Code (83) See related codes (41,42
Code (84) See related codes (43,44)
Code (85) See related codes (45,46)
Code (86) See related codes (51,52,53,54)

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