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Home >> Audi >> 1995 >> A6 Sedan (4A2) V6-2.8L (AFC) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Output Diagnostic Test Mode (DTM) >> TCM

TCM

OUTPUT DIAGNOSIS TEST MODE
(VAG 1551 function 03)

The following components are checked via the output diagnostic test mode:

Solenoid Valve 1 - N88
Solenoid Valve 2 - N89
Solenoid Valve 3 - N90
Solenoid Valve 4 - N91
Cruise Control Power Supply Relay
Kick-Down Switch - F8
Solenoid Valve Power Supply Relay
Shift Lock Solenoid - N110, if equipped.

NOTE:

The Output DTM can only be carried out with the ignition switched ON and the engine NOT running. The transmission selector lever in "P" or "N" and the car is stationary.

The Output DTM will be interrupted if engine is started or if a speed pulse is detected.

You can hear the Solenoid Valves N88, N89, N90, the Cruise Control Power Supply relay and the Solenoid Valve Power Supply relay click during the output test.

To check Solenoid Valve 4 (N91), you'll need to connect the V.A.G 1598 Test Box to the Transmission Control Module and use an LED tester to check for voltage.

You'll also have to connect the V.A.G 1598 to the A/C control head to check if a signal from Kick-down Switch F8 is being sent from the TCM to the A/C control head.

During Output DTM, the individual components are activated for 30 seconds only. If within the 30 seconds the "ARROW" button is not pushed the VAG 1551 will display the following message:

Function unknown or cannot be
implemented at this time !

Push the "ARROW" button to switch to continue the Output DTM.

PROCEDURE

- Connect VAG 1551 Scan Tool, refer to Connecting and Operating VAG 1551 Scan Tool. Connecting and Operating VAG 1551 Scan Tool

- Press 0 and 2 buttons to select address word 02 "Transmission electronics" and continue until display appears as shown:

Rapid data transfer HELP
Select function XX

NOTE: Press the HELP button to print a list of possible malfunctions.

- Press buttons 0 and 3 to select function 03 "Output Diagnostic Test Mode".

- Display will appear as shown:

Rapid data transfer Q
03 - Output Diagnostic Test Mode

- Press Q button to enter input.

- Display will appear as shown:

Output Diagnostic Test Mode
Solenoid Valve 1 - N88

Solenoid Valve must activate audibly (click).

^ If the solenoid is not activated, perform electrical test.

- Press "ARROW" button to proceed to the next step.

- Display will appear as shown:

Output Diagnostic Test Mode
Solenoid Valve 2 - N89

Solenoid Valve must activate audibly (click).

^ If the solenoid is not activated, perform electrical test.

- Press "ARROW" button to proceed to the next step.

- Display will appear as shown:

Output Diagnostic Test Mode
Solenoid Valve 3 - N90

Solenoid Valve must activate audibly (click)

^ If the solenoid is not activated, perform electrical test.

- Press "ARROW" button to proceed to the next step.

NOTE:To check Solenoid Valve 4 (N91), you'll need to connect the V.A.G 1598 Test Box to the Transmission Control Module and use an LED tester to check for voltage. Refer to VAG 1598 Pin Out Box: Connection and Use. VAG 1598 Pin Out Box: Connection and Use

- Display will appear as shown:

Output Diagnostic Test Mode
Solenoid Valve 4 - N91

The LED tester must blink.

^ If the solenoid is not activated, perform electrical test.

- Press "ARROW" button to proceed to the next step.

- Display will appear as shown:

Output Diagnostic Test Mode
Cruise Control Power Supply Relay

The relay, inside the TCM, must activate audibly (click).

^ If the relay is not activated, perform electrical test.

- Press "ARROW" button to proceed to the next step.

NOTE: You'll have to connect the V.A.G 1598 to the A/C control head and use an LED tester to check if a signal from the Kick-down Switch F8 is being sent from the TCM to the A/C control head. Refer to VAG 1598 Pin Out Box: Connection and Use. VAG 1598 Pin Out Box: Connection and Use

- Display will appear as shown:

Output Diagnostic Test Mode
Kick-Down Switch - F8

The LED tester must light up.

- Press "ARROW" button to proceed to the next step.

- Display will appear as shown:

Output Diagnostic Test Mode
Solenoid Valve Power Supply Relay

The relay, inside the TCM, must activate audibly (click).

- Press "ARROW" button to proceed to the next step.

If the vehicle is not equipped with "Shift Lock"

- Display will appear as shown:

Function unknown or cannot be
implemented at this time !

This indicates that you have reached the end of the Output Diagnostic Test Mode.

- Press "ARROW" button.

- Display will appear as shown:

Rapid data transfer HELP
Select function XX

To repeat Output Diagnostic Test switch ignition off for 20 seconds and then back on and then reselect function 03

If the vehicle is equipped with "Shift Lock"

- Display will appear as shown:

Output Diagnostic Test Mode
Shift Lock Solenoid - N110

The Shift Lock Solenoid triggered (clicks).

- Press "ARROW" button to proceed to the next step.

If the vehicle is not equipped with "Shift Lock"

- Display will appear as shown:

Function unknown or cannot be
implemented at this time !

This indicates that you have reached the end of the Output Diagnostic Test Mode.

- Press "ARROW" button.

- Display will appear as shown:

Rapid data transfer HELP
Select function XX

To repeat Output Diagnostic Test switch ignition off for 20 seconds and then back on and then reselect function 03








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