Output Diagnostic Test Mode (DTM) (Function 03)
Output Diagnostic Test Mode (DTM)
Output Diagnostic Test Mode (DTM) (Function 03), Initiating
Output Diagnostic Test Mode (DTM) activates the following components in the specified sequence:
1. Evaporative Emission (EVAP) canister purge regulator valve -N80-
2. Secondary Air Injection (AIR) solenoid valve -N112-
3. Secondary Air Injection (AIR) pump relay -J299-
4. Intake Manifold Change-Over Valve -N156-
5. Bank 1, (intake) camshaft adjustment
6. Leak Detection Pump (LDP) -V144-
7. Bank 1, (exhaust) camshaft adjustment
8. Cylinder 1 fuel injector -N30-
9. Cylinder 5 fuel injector -N83-
10. Cylinder 3 fuel injector -N32-
11. Cylinder 6 fuel injector -N84-
12. Cylinder 2 fuel injector -N31-
13. Cylinder 4 fuel injector -N33-
NOTE:
- Output Diagnostic Test Mode (DTM) is only possible with engine idle and ignition switched on.
- Output Diagnostic Test Mode (DTM) is aborted if engine is started or an RPM signal is recognized.
- In output Diagnostic Test Mode (DTM), individual actuators are activated for approx. 60 seconds unless the next actuator is selected earlier by pressing the -> button.
- Output DTM can be terminated by pressing the C-button. Then it is not necessary to press the -> button to continue through to the end. This is particularly important since the fuel injectors are activated in ignition sequence via the -> button and inject fuel.
- The electric Fuel Pump (FP) runs during all of output Diagnostic Test Mode (DTM).
- Actuators are checked either acoustically or by touch.
- Output Diagnostic Test Mode (DTM) is terminated after 1 minute if no further actuators are activated.
- Engine must be run briefly before repeating output Diagnostic Test Mode (DTM).
Special tools and equipment
- VAG 1551 scan tool (or VAG 1552 mobile scan tool) with VAG 1551/3B cable
- VAG 1598/31 test box
- VAG 1526 multimeter or VAG 1715 multimeter
- VAG 1527B Voltage tester
- VAG 1594 Connector test kit
- Wiring diagram
Test requirements
- Main fuses must be OK.
- All fuses must be OK.
Procedure
- Connect VAG 1551 Scan tool (or VAG 1552 Scan tool). Then switch ignition on and select the Engine Control Module (ECM) using address word 01.
Connecting scan tool and selecting ECM. Refer to Scan Tool Connecting and Initial Checks. Scan Tool Testing and Procedures
Indicated on display:
Rapid data transfer HELP
Select function XX
- Operate scan tool according to indications on display:
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode (DTM)" function 03.
Indicated on display:
Rapid data transfer Q
03 - Output Diagnostic Test Mode (DTM)
Activating Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-:
- Press -Q- button to confirm input.
Indicated on display:
Output Diagnostic Test Mode (DTM) ->
EVAP canister purge regulator valve -N80-
Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- must click until next actuator is activated by pressing the -> button.
The valve clicks, but a malfunction is recognized anyway (valve opens but does not close):
- Disconnect hose -1- from Solenoid Valve and connect an auxiliary hose to the free connection of the valve -arrow-.
- Blow into auxiliary hose during output DTM (toward Throttle Valve Control Module -J338-). Valve must open and close
If valve does not click:
- Disconnect 2-pin connector from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- -arrow-.
- Using adapter cables from the VAG 1594 connector test kit, connect VAG 1527B voltage tester to disconnected connector. LED must blink (light/darker).
LED blinks:
- Press -C- button to end output Diagnostic Test Mode (DTM).
Indicated on display:
Output Diagnostic Test Mode terminated
- Switch ignition off.
- Replace solenoid valve.
LED does not blink:
- Press -C- button to end output Diagnostic Test Mode (DTM).
Indicated on display:
Output Diagnostic Test Mode terminated
- Switch ignition off.
- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
- Check wire between test box socket 64 + 2-pin connector terminal 2 for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
- Also check the wire for short circuit to B+ or Ground (GND).
- Check wire between 2-pin connector terminal 2 and the Fuel Pump (FP) relay -J17- for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Replace Engine Control Module (ECM).
Activating secondary Air Injection (AIR) Solenoid Valve -N112-:
- Press the -> button.
Indicated on display:
Output Diagnostic Test Mode (DTM) ->
Secondary Air Injection solenoid valve -N112-
Secondary Air Injection (AIR) Solenoid Valve must click until next actuator is activated by pressing the -> button.
If valve does not click:
- Disconnect 2-pin connector -1- from secondary Air Injection (AIR) valve.
- Using adapter cables from the VAG 1594 connector test kit, connect VAG 1527B voltage tester to disconnected connector. LED must blink (light/darker).
LED blinks:
- Press -C- button to end output Diagnostic Test Mode (DTM).
Indicated on display:
Output Diagnostic Test Mode terminated
- Switch ignition off.
- Replace secondary Air Injection (AIR) Solenoid Valve -N112-:
LED does not blink:
- Press -C- button to end output Diagnostic Test Mode (DTM).
- Switch ignition off.
- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
- Check wire between test box socket 44 + 2-pin connector terminal 2 for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
- Also check the wire for Short to B+ or Ground (GND). Specification: Infinity Ohms
- Check wire between 2-pin connector terminal 2 and the Fuel Pump (FP) relay -J17- for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Replace Engine Control Module (ECM).
Activating secondary Air Injection (AIR) pump relay -J299-:
- Press the -> button.
Indicated on display:
Output Diagnostic Test Mode (DTM) ->
Secondary Air Injection pump relay -J299-
The Secondary Air Injection (AIR) pump relay activates the Secondary Air Injection (AIR) pump motor and this runs in intervals until the next actuator is activated by pressing the -> button.
If the Secondary Air Injection (AIR) pump motor -V101- does not run in intervals:
- Remove noise insulation pan:
- Disconnect 2-pin connector from motor for secondary air pump (arrow).
- Using adapter cables from the VAG 1594 connector test kit, connect VAG 1527B voltage tester to disconnected connector. LED must blink.
LED blinks:
- Press -C- button to end output Diagnostic Test Mode (DTM).
Indicated on display:
Output Diagnostic Test Mode terminated
- Switch ignition off.
- Replace Secondary Air Injection (AIR) Pump Motor -V101-:
If LED does not blink, but the Secondary Air Injection (AIR) Pump Relay does click:
- Switch ignition off.
- Check wire between Secondary Air Injection (AIR) pump motor -V101- terminal 1 and chassis Ground (GND) for open circuit. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Remove Secondary Air Injection (AIR) pump relay (arrow) from relay carrier.
NOTE:
- Remove battery Ground (GND) strap if tools are necessary for removal of relays or control modules from the relay carrier.
- Obtain radio code for radios with anti-theft coding before disconnecting battery.
- Check wire between connector terminal 2 at Secondary Air Injection (AIR) Pump Motor and terminal 8 on relay carrier for open circuit. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Check voltage supply at terminal 1 (terminal 30) for Secondary Air Injection (AIR) pump relay -J299-.
If voltage supply is OK:
- Replace Secondary Air Injection (AIR) Pump Relay -J299-.
If LED does not blink and Secondary Air Injection (AIR) pump relay does not click:
- Switch ignition off.
- Remove Secondary Air Injection (AIR) pump relay -arrow- from relay carrier in protective housing for control modules.
NOTE:
- Remove battery Ground (GND) strap if tools are necessary for removal of relays or control modules from the relay carrier.
- Obtain radio code for radios with anti-theft coding before disconnecting battery.
- Initiate output Diagnostic Test Mode (DTM) again and activate Secondary Air Injection (AIR) Pump Relay -J299-.
NOTE:
- Engine must be run briefly before repeating output Diagnostic Test Mode (DTM).
- Use auxiliary wires from VAG 1594 connector test kit to connect VAG 1527B voltage tester to terminals 4 and 6 of the relay carrier. LED must blink.
LED blinks:
- Press -C- button to end output Diagnostic Test Mode (DTM).
- Switch ignition off.
- Replace Secondary Air Injection (AIR) pump relay -J299-.
LED does not blink:
Ignition remains switched off
- Use auxiliary wires from VAG 1594 to connect VAG 1527B voltage tester to terminal 2 of the relay carrier and to chassis Ground (GND). LED must light up.
LED does not light up:
- Check wire between relay carrier terminal 2 and main fuses for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
- Check wire between test box socket 46 and terminal 4 on relay carrier for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Replace Engine Control Module (ECM).
Activating intake manifold change-over valve -N156-:
- Press the -> button.
Indicated on display:
Output Diagnostic Test Mode (DTM) ->
Intake manifold change-over valve -N156-
Intake manifold Change-Over valve must click until next actuator is activated by pressing the -> button.
NOTE: If there is insufficient vacuum pressure, the intake Manifold Change-Over Valve -N156- activates the actuator for intake manifold change-over. Valve is bolted to right side of intake manifold, next to the Intake Manifold Change-Over Valve. Testing and Inspection
If valve does not click:
- Disconnect 2-pin connector from Intake Manifold Change-Over Valve -N156- (arrow).
- Using adapter cables from the VAG 1594 connector test kit, connect VAG 1527B voltage tester to disconnected connector. LED must blink (light/darker).
LED blinks:
- Press -C- button to end output Diagnostic Test Mode (DTM).
Indicated on display:
Output Diagnostic Test Mode terminated
- Switch ignition off.
- Replace Intake Manifold Change-Over Valve -N156-.
LED does not blink:
Ignition remains switched off
- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
- Check wire between test box socket 104 + 2-pin connector terminal 2 for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
- Check wire between 2-pin connector terminal 2 and the Fuel Pump (FP) relay -J17- for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Replace Engine Control Module (ECM).
Activate camshaft adjustment:
- Press the -> button.
Indicated on display:
Output Diagnostic Test Mode ->
Camshaft adjustment
The valve for intake camshaft adjustment is activated until the next actuator is activated by pressing the -> button.
NOTE: During this output Diagnostic Test Mode (DTM), only valve -1- is activated (barely audible).
If a malfunction is suspected:
- Disconnect the 2-pin connector -1- from valve.
- Using adapter cables from the VAG 1594 connector test kit, connect VAG 1527B voltage tester to disconnected connector. LED must blink.
LED blinks:
- Press the -> button.
- Finish output Diagnostic Test Mode (DTM).
LED does not blink:
- Switch ignition off.
- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
- Check wire of valve -1- between test box socket 114 + 2-pin connector terminal 2 for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
- Also check the wire for short circuit to B+ or Ground (GND).
- Check wire between 2-pin connector terminal 2 and the Fuel Pump (FP) relay -J17- for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Replace Engine Control Module (ECM)
Activating Leak Detection Pump (LDP) -V144-:
- Press the -> button.
Indicated on display:
Output Diagnostic Test Mode ->
Leak Detection Pmp tnk ventilation system
Leak Detection Pump (LDP) -V144- must click until output Diagnostic Test Mode (DTM) is ended by pressing the -> button.
If Leak Detection Pump (LDP) -V144- does not click:
- Press -C- button to end output Diagnostic Test Mode (DTM).
Indicated on display:
Output Diagnostic Test Mode terminated
- Switch ignition off.
- Reinitiate output Diagnostic Test Mode (DTM).
- Remove the 3-pin connector for the Leak Detection Pump (LDP) -arrow-.
- Connect VAG 1527B voltage tester between terminals 2 + 3 of disconnected connector using wires from VAG 1594 connector test kit. LED must blink (light/darker).
LED blinks:
- Press -C- button to end output Diagnostic Test Mode (DTM).
Indicated on display:
Output Diagnostic Test Mode terminated
- Switch ignition off.
- Replacing Leak Detection Pump (LDP) -V144-.
LED does not blink:
- Switch ignition off.
- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
- Check wiring between test box and 3-pin connector for open circuit according to wiring diagram. Terminal 1 + socket 80. Terminal 2 + socket 25. Wire resistance: max: 1.5 Ohms
- Also check the wire for Short to B+ or Ground (GND). Specification: Infinity Ohms
- Check wire between 3-pin connector terminal 3 and the Fuel Pump (FP) relay -J17- for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Replace Engine Control Module (ECM).
Activate camshaft adjustment:
- Press the -> button.
Indicated on display:
Output Diagnostic Test Mode (DTM) ->
Camshaft adjustment
The valve for exhaust camshaft adjustment is activated until the next actuator is activated by pressing the -> button.
NOTE: During this output Diagnostic Test Mode (DTM), only valve -2- is activated (barely audible).
If a malfunction is suspected:
- Disconnect the 2-pin connector -2- from valve.
- Using adapter cables from the VAG 1594 connector test kit, connect VAG 1527B voltage tester to disconnected connector. LED must blink.
LED blinks:
- Press the -> button.
- Finish output Diagnostic Test Mode (DTM).
LED does not blink:
- Switch ignition off.
- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.
- Check wire of valve -2- between test box socket 115 + 2-pin connector terminal 2 for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
- Also check the wire for Short to B+ or Ground (GND).
- Check wire between 2-pin connector terminal 2 and the Fuel Pump (FP) relay -J17- for open circuit according to wiring diagram. Wire resistance: max: 1.5 Ohms
If no malfunctions are found in wire:
- Replace Engine Control Module (ECM)
Activate fuel injectors (-N30- to -N84-):
- Press the -> button.
Indicated on display:
Output Diagnostic Test Mode (DTM) ->
Cylinder 1 fuel Injector -N30-
- Press the -> button again to activate the fuel injector five times.
To activate fuel injectors for cylinders 2 to 6, proceed in the same manner as for the activation of fuel injector 1.
It is not possible to skip individual tests, but it is possible to abort output Diagnostic Test Mode (DTM) by pressing the -C- button.
If one or more valves do not click:
- Press -C- button to end output Diagnostic Test Mode (DTM).
Indicated on display:
Output Diagnostic Test Mode terminated
- Switch ignition off.
- Check the relevant fuel injector. Fuel Injectors, Checking
NOTE: Ignition must be switched off after ending output Diagnostic Test Mode (DTM). If ignition is not switched off before starting engine again, the engine will not start because fuel injectors will not be activated.
- Check DTC memory, repair any malfunctions and then erase DTC memory.
- Read readiness code. If DTC memory was erased or the Engine Control Module (ECM) was disconnected from the continuous B+ supply, the readiness code must be re-generated. Monitors, Trips, Drive Cycles and Readiness Codes Monitors, Trips, Drive Cycles and Readiness Codes