Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESOUTPUT DIAGNOSTIC TEST MODE (DTM)MMS 300 ENGINE MANAGEMENT SYSTEMWITH VAG 1551 SCAN TOOL
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
With VAG 1551 Scan Tool
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION With VAG 1551 Scan Tool
OUTPUT DIAGNOSIS TEST MODE
(VAG 1551 function 03)
The following components are checked via the output diagnostic test mode:
^ Fuel Pump relay - J17
^ Idle Air Control (IAC) valve - N71
^ Intake manifold change-over valve - N156
^ EVAP canister purge regulator valve - N80
^ EGR vacuum regulator solenoid valve - N18
Notes:
The Output DTM can only be carried out with the ignition switched ON and the engine NOT running.
The Output DTM will be interrupted if engine is started or if a speed pulse is detected.
During Output DTM, the individual components are activated until the "ARROW" button is used to switch to the next component or the Output DTM is ended.
The components are checked by listening for sounds of activation, and/or by touching.
If the output DTM is to be repeated without running the engine, switch OFF the ignition for approx. 20 seconds.
Procedure
- Connect VAG 1551 Scan Tool, refer to Connecting and Operating VAG 1551 Scan Tool. With MMS 300 Engine Management System
- Press 0 and 1 buttons to select address word 01 "Engine electronics and continue switching 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
Fuel Pump relay - J17
- Fuel Pump relay must activate audibly (click)
- Fuel pump must run
- Must be able to hear sound of fuel flowing through fuel pressure regulator
- Press "ARROW" button to proceed to the next step.
- Display will appear as shown:
Output Diagnostic Test Mode
Idle Air Control Valve - N 71
The IAC valve is triggered (clicks) until switched to the next Output check using the "ARROW" button.
- Press "ARROW" button to proceed to the next step.
- Display will appear as shown:
Output Diagnostic Test Mode
Intake manifold change-over valve - N156
The intake manifold change-over valve is activated (clicks) until switched to the next Output check using the "ARROW" button.
- Press "ARROW" button to proceed to the next step.
- Display will appear as shown:
Output Diagnostic Test Mode
EVAP canister purge regulator valve - N 80
This valve is triggered (clicks) until switched to the next output check using the "ARROW" button.
- Press "ARROW" button to proceed to the next step.
- Display will appear as shown:
Output Diagnostic Test Mode
EGR vacuum regulator solenoid valve - N18
This valve is triggered (clicks) until switched to the next output check using the "ARROW" button.
- Press "ARROW" button.
- Display will appear as shown:
Rapid data transfer HELP
Select function XX
If function O3 "Output Diagnostic Test Mode" is to be selected again without running the engine, turn off the ignition for 20 seconds.
If one of the components does not click or activate, check component the wiring and/or the ECM.
(VAG 1551 function 03)
The following components are checked via the output diagnostic test mode:
^ Fuel Pump relay - J17
^ Idle Air Control (IAC) valve - N71
^ Intake manifold change-over valve - N156
^ EVAP canister purge regulator valve - N80
^ EGR vacuum regulator solenoid valve - N18
Notes:
The Output DTM can only be carried out with the ignition switched ON and the engine NOT running.
The Output DTM will be interrupted if engine is started or if a speed pulse is detected.
During Output DTM, the individual components are activated until the "ARROW" button is used to switch to the next component or the Output DTM is ended.
The components are checked by listening for sounds of activation, and/or by touching.
If the output DTM is to be repeated without running the engine, switch OFF the ignition for approx. 20 seconds.
Procedure
- Connect VAG 1551 Scan Tool, refer to Connecting and Operating VAG 1551 Scan Tool. With MMS 300 Engine Management System
- Press 0 and 1 buttons to select address word 01 "Engine electronics and continue switching 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
Fuel Pump relay - J17
- Fuel Pump relay must activate audibly (click)
- Fuel pump must run
- Must be able to hear sound of fuel flowing through fuel pressure regulator
- Press "ARROW" button to proceed to the next step.
- Display will appear as shown:
Output Diagnostic Test Mode
Idle Air Control Valve - N 71
The IAC valve is triggered (clicks) until switched to the next Output check using the "ARROW" button.
- Press "ARROW" button to proceed to the next step.
- Display will appear as shown:
Output Diagnostic Test Mode
Intake manifold change-over valve - N156
The intake manifold change-over valve is activated (clicks) until switched to the next Output check using the "ARROW" button.
- Press "ARROW" button to proceed to the next step.
- Display will appear as shown:
Output Diagnostic Test Mode
EVAP canister purge regulator valve - N 80
This valve is triggered (clicks) until switched to the next output check using the "ARROW" button.
- Press "ARROW" button to proceed to the next step.
- Display will appear as shown:
Output Diagnostic Test Mode
EGR vacuum regulator solenoid valve - N18
This valve is triggered (clicks) until switched to the next output check using the "ARROW" button.
- Press "ARROW" button.
- Display will appear as shown:
Rapid data transfer HELP
Select function XX
If function O3 "Output Diagnostic Test Mode" is to be selected again without running the engine, turn off the ignition for 20 seconds.
If one of the components does not click or activate, check component the wiring and/or the ECM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.