If the TCM detects faults in the control circuits, it stores them in memory. To read the codes, the VAG 1551 electronic tester with the VAG 1551/3 adapter is used.
Note: All information on reading codes is contained in the tester.
Alternatively, fault detection can be carried out by measuring resistance and voltage values using the VAG 1598/18 tester (Refer to the tables).
The voltage test is performed without disconnecting the battery - the tester is connected to the TCM and its wiring. When checking resistance, disconnect the negative wire from the battery and connect the tester to the TCM wiring harness. Leave the TCM disconnected.
If a fault is detected, the electrical wiring or the corresponding circuit element should be repaired.
If everything is OK, then the TCM itself is damaged.
Checking voltages and resistances to detect faults in electrical components
| Contacts on VAG 1598/18 | Subject verification of the part- system current | Conditions subject to implementation and additional procedures | Nominal meanings | Actions to identify reasons for malfunction |
| 23 + 1 | Voltage tSM power supply | The ignition is on (key in oN position) | Voltage close to battery voltage | Check the status electrical wiring coming from terminals no. 1 Check for availability conductivity of electrical wiring, coming from terminal No.23 to fuse C/15A in mounting block fuses/relays |
| 5 + 28 | Sensor provisions throttle dampers | Ignition off (key in oFF position) Throttle valve completely closed Throttle valve completely open |
2100 + 3900 Ohm | Check the status electrical wiring Calibrate the sensor |
| 5 + 50 | Sensor provisions throttle dampers | Ignition off (key in oFF position) Throttle valve completely closed Throttle valve completely open |
700 + 1800 Ohm | Check the status electrical wiring Calibrate the sensor |
| 29+15 | Electromagnetic sensor-switch for switching lock | Ignition is switched on (ON) Selector lever in position "R" or
"N" The foot brake is pressed | Voltage close to battery voltage About 0.2 V | Check the wiring Replace the shift lock solenoid |
| 15+1 | Signal from the brake light switch sensor | Ignition on (ON) Foot brake released The foot brake is on | OV Voltage close to battery voltage | Check the wiring Replace the brake light switch sensor |
| 63 + 1 | Multifunctional switch | Ignition off (OFF) Move the selector lever to positions R, N, D, 2 and 3 Move the lever selector lever to positions P and 1 Shift the selector lever to positions P, R, 2 and 1 Shift the selector lever to positions N, D and 3 | open | Check that the wiring is connected correctly Replace the multifunction switch |
| 0.8 - 1.0 Ohm | ||||
| open | ||||
| 40+1 | 0.8 - 1.0 Ohm | |||
| 62+ 1 | Ignition off (OFF) Move the selector lever to positions P, R, N and D Move the selector lever in positions 3, 2 and 1 | open | ||
| 0.8 - 1.0 0m | ||||
| 18 + 1 | Ignition is on (ON) Move the selector lever to positions P, R and N Move the selector lever to positions D 3, 2 and 1 | Voltage close to battery voltage | ||
| OV | ||||
| 55 + 67 | Solenoid valve 1 | Ignition is off (OFF) Control unit is removed | 55 - 65 Ohm | Check the condition of the wiring harness |
| open | Replace the valve body assembly | |||
| 54 + 67 | Solenoid valve 2 | Ignition is off (OFF) Control unit is removed | 55 - 65 Ohm | Check the condition of the wiring harness |
| 54+ 1 | open | Replace the valve body assembly | ||
| 9 + 67 | Solenoid valve 3 | Ignition off (OFF) TCM disabled | 55 - 65 Ohm | Check that the electrical wiring is connected correctly |
| 9+ 1 | open | Replace the valve assembly | ||
| 47 + 67 | Solenoid valve 4 | Ignition off (OFF) TCM disabled | 4.5 - 6.5 Ohm | Check that the electrical wiring is connected correctly |
| 47 + 1 | open | Replace the valve assembly | ||
| 56 + 67 | Solenoid valve 5 | Ignition off (OFF) TCM disabled | 55 - 65 Ohm | Check that the electrical wiring is connected correctly |
| 56 + 1 | open | Replace the valve assembly | ||
| 58 +22 | Solenoid valve 6 | Ignition off (OFF) TCM disabled | 4.5 - 6.5 Ohm | Check that the electrical wiring is connected correctly |
| 58+1/22+1 | open | Replace the valve assembly | ||
| 10 + 67 | Solenoid valve 7 | Ignition off (OFF) TCM disabled | 55 - 65 Ohm | Check that the electrical wiring is connected correctly |
| 10+ 1 | open | Replace the valve assembly | ||
| 23 + 29 | Electromagnetic sensor-switch for switching blocking | Ignition off (OFF) TCM disabled | 14 - 25 Ohm | Check the wiring for proper connection Replace the solenoid assembly switching locks |
| 1 + 16 | Kickdown Mode Switch Sensor | Ignition off (OFF) TCM disabled Accelerator pedal released Accelerator pedal completely squeezed out | open less than 1.5 ohms | Check that the electrical wiring is connected correctly. Adjust or replace the throttle cable |
| 20 + 65 | Vehicle speed sensor | Ignition off (OFF) TSM is disconnected Switch the ohmmeter to the 2 kOhm measurement range | 800 - 900 Ohm | Check the wiring for proper connection Replace the speed sensor car |
| 6 + 67 | ATF temperature sensor | Ignition off (OFF) TSM Disabled Switch the ohmmeter to the measurement limit of 200 kOhm Temperature ATF = 20°C | 24.700 Ohm | Check that the electrical wiring is connected correctly. Replace valve assembly |
| Switch the ohmmeter to the 200 kOhm measurement range ATF temperature = 60°C | About 48,800 Ohm | |||
| ATF temperature = 120°C | About 7400 Ohm | |||
| 21 +66 | Motion speed sensor (mounted on the transmission) | Ignition off (OFF) TSM is disconnected Switch the ohmmeter to the 2kOhm measurement limit | 800 - 900 Ohm | Check the wiring for proper connection Replace the speed sensor car |
Decoding VAG transmission control system fault codes
| 00258 | Open circuit, short circuit to ground or damage to electromagnet 1 |
| 00260 | Open circuit, short circuit to ground or damage to electromagnet 2 |
| 00262 | Open circuit, short circuit to ground or damage to electromagnet 3 |
| 00264 | Open circuit, short circuit to ground or damage to electromagnet 4 |
| 00266 | Open circuit, short circuit to ground or damage to electromagnet 5 |
| 00268 | Open circuit, short circuit to ground or damage to electromagnet 6 |
| 00270 | Open circuit, short circuit to ground or damage to electromagnet 7 |
| 00281 | Electrical wiring is broken, vehicle speed sensor is damaged or wheel sensor |
| 00293 | Broken wiring or damaged sensor switch transmission mode |
| 00297 | Broken wiring or damaged speed sensor |
| 00300 | Broken wiring or damaged temperature sensor ATF |
| 00518 | Open/short circuit in wiring or damage to the position sensor
throttle position sensor (the signal from the throttle position sensor comes
on TSM via ESM; on vehicles with a CAN bus, the TCM only checks the fact that a signal has been received from sensor, on models without a CAN bus the status of the signal is also checked wires) |
| 00529 | Broken wiring or loss of signal from the speed sensor car, vehicle speed sensor on transmission, engine speed or throttle position sensor |
| 00532 | Low supply voltage of the solenoid valves as a result battery discharge |
| 00545 | Open circuit in the wiring or short circuit to ground (broken communication between engine and transmission control modules) |
| 00596 | Short circuit in the wiring of the solenoid valves |
| 00638 | Open circuit in the wiring or short circuit to ground (broken communication between engine and transmission control modules) |
| 00641 | Excessively high ATF temperature or sensor damage aTF temperatures |
| 00652 | Electrical or hydraulic failure (clutch or valve assembly) |
| 00660 | Broken wiring or incorrect sensor connection throttle position (the sensor is damaged) |
| 65535 | TCM is faulty |