Output Diagnostic Test Mode (DTM)
Output Diagnostic Test Mode (DTM)
NOTE:
- The output DTM can only be performed with the engine stopped and the ignition switched on.
- During actuator diagnosis, the individual actuators (with the exception of the injectors) are operated in turn for about one minute unless the next actuator is selected by pressing the -> button.
- The control elements can be checked acoustically or by way of touch.
- Output Diagnostic Test Mode (DTM) is aborted if it is not switched further after one minute of activation time, the engine is started or an RPM signal is recognized.
- Before restarting the output DTM the engine must be started and the ignition switched off and on again.
Vehicles with control module No. 8EO 909 ...
Activation 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 Valve -1 - for camshaft adjustment -N205-, Bank 1
6 Leak Detection Pump (LDP) tank ventilation system
7 Exhaust Flap Valve 1 -N321 -
8 Valve -2- for camshaft adjustment -N208-, Bank 2
9 Exhaust camshaft timing control, Bank 1
10 Exhaust camshaft timing control, Bank 2
11 Activate brake vacuum pump 1)
12 Coolant fan activation 1
13 Coolant Circulation Pump Relay -J151- 2)
14 Cylinder 1 Fuel Injector-N30-
15 Cylinder 4 Fuel Injector -N33-
16 Cylinder 3 Fuel Injector -N32-
17 Cylinder 6 Fuel Injector -N84-
18 Cylinder 2 Fuel Injector -N31-
19 Cylinder 5 Fuel Injector -N83-
1) Only on vehicles with automatic transmission.
2) Only in vehicles with hot-country function.
Test requirements:
- Fuses for engine electronics OK
Test sequence
- Connect vehicle diagnostic, testing and information system VAS5051 and select vehicle system "01 -Engine electronics". Ignition must be switched on.
Display on VAS5051:
- Under -1 - select diagnostic function "03 - Output Diagnostic Test Mode".
Activating evaporative emission (EVAP) canister purge regulator valve (tank breather valve)
Display on VAS5051:
A - Control element test waiting: Select next step to continue
1 - Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-
- Press -> button.
Display on VAS5051:
A - Control element test running: Continuation permitted
- This valve is activated (clicks) at approx. 1 minute intervals if the operation is not switched to the next control element by pressing the -> button.
NOTE: Fuel pump must run during activation time, the flow noise at fuel pressure regulator must be clearly audible. If fuel pump does not run, check activation. Testing and Inspection
If the valve is not activated (does not click).
- Check solenoid valve 1 for Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. Testing and Inspection
Activating secondary air inlet valve
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
2 - Secondary air inlet valve -N112-
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- This valve is activated (clicks) at approx. 1 minute intervals if the operation is not switched to the next control element by pressing the -> button.
If the valve is not activated (does not click).
- Check secondary air injection (AIR) solenoid valve -N112-:
Activating secondary air injection (AIR) pump relay
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
3 - Secondary Air Injection (AIR) Pump Relay -J299-
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- The Secondary Air Injection (AIR) Pump Relay -J299- (in relay carrier in electronics box, plenum chamber, position 2) switches the Secondary Air Injection (AIR) Pump Motor -V101- on and off at approx. 1 minute intervals if the operation has not been switched to the next control element by pressing the -> button.
If secondary air pump does not run intermittently:
- Check secondary air injection (AIR) pump relay -J299-:
Activation of intake manifold change-over valve
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
4 - Intake manifold change-over valve -N156-
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- This valve is activated (clicks) at approx. 1 minute intervals if the operation is not switched to the next control element by pressing the -> button.
If the valve is not activated (does not click).
- Check intake manifold change-over valve -N156-. Testing and Inspection
Activating intake camshaft adjustment valve, bank 1
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
5 - Bank 1, Valve -1 - for camshaft adjustment -N205-
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- This valve is activated (clicks) at approx. 1 minute intervals if the operation is not switched to the next control element by pressing the -> button.
If the valve is not activated (does not click).
- Check camshaft adjustment valves:
Activating Leak Detection Pump (LDP) tank ventilation system
- Click on -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
6 - Leak Detection Pump (LDP) tank ventilation system
- Click on -> - button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- The Leak detection pump (LDP) -V144- is activated in intervals for approx. 1 minute (clicks), unless -> button is pressed first to switch to the next actuator.
NOTE: Operating noise of Leak Detection Pump (LDP) is softly audible at left rear wheelhouse.
If Leak Detection Pump (LDP) is not activated (no operating noise audible):
- Check Leak Detection Pump (LDP):
Activating exhaust flap valve
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
7 - Exhaust Flap Valve 1 -N321-
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- This valve (in left storage compartment in luggage compartment) is activated in intervals for approx. 1 minute (clicks), unless -> button is pressed first to switch to the next actuator.
- Check exhaust flap.
Activating intake camshaft adjustment valve, bank 2
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
8 - Bank 2, Valve -2- for camshaft adjustment -N208-
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- This valve is activated (clicks) in intervals for approx. 1 minute if the operation is not switched to the next control element by pressing the -> button.
If the valve is not activated (does not click):
- Check camshaft adjustment valves:
Activating exhaust camshaft adjustment valve, bank 1
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
9 - Bank 1, camshaft adjustment (exhaust)
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- This valve is activated (clicks) in intervals for approx. 1 minute if the operation is not switched to the next control element by pressing the -> button.
If the valve is not activated (does not click):
- Check camshaft adjustment valves:
Activating exhaust camshaft adjustment valve, bank 2
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
10 - Bank 2, camshaft adjustment (exhaust)
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- This valve is activated (clicks) in intervals for approx. 1 minute if the operation is not switched to the next control element by pressing the -> button.
If the valve is not activated (does not click):
- Check camshaft adjustment valves:
Activating brake vacuum pump 1)
1) Only on vehicles with automatic transmission.
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
11 - Activation of brake vacuum pump
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- The brake booster vacuum pump, left front in engine compartment, must start up for a short time, unless the operation has been switched to the next control element by pressing the -> button.
If the brake booster vacuum pump does not start up:
- Check brake booster vacuum pump:
Activating coolant fan control
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
12 - Coolant FC (Fan Control) activation 1
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- Coolant FC (Fan Control) Control Module -J293- (engine compartment in front) slowly regulates coolant fan once up to maximum RPM, unless -> button is pressed first, to switch to the next actuator.
If the fan does not start:
- Check coolant fan and Coolant FC (Fan Control) Control Module -J293-.
Activating relay for coolant run-on pump 2)
2) only in vehicles with hot-country function Login Procedure or Coding II
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
13 - Coolant Circulation Pump Relay -J151-
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- The Coolant Circulation Pump Relay -J151- switches the pump for coolant run-on on and off at one minute intervals unless the -> button is first pressed to switch to the next control element.
If the after-run coolant pump does not start:
- Check whether hot-country function is coded. Hot-Country Function, Activating/Deactivating
Activating injectors
NOTE: The injectors are activated according to the ignition sequence: cyl. 1, cyl. 4, cyl. 3, cyl. 6, cyl. 2, cyl. 5.
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
14 - Cylinder 1 Fuel Injector -N30-
- Press -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- After pressing the -> button the injector must click five times.
- Press -> button.
Display on VAS5051:
A - Control element test waiting: Select next step to continue
15 - Cylinder 4 Fuel Injector -N33-
- Click on -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- Fuel injector must click 5 times after -> button is pressed.
- Click on -> button
Display on VAS5051:
A - Control element test waiting: Select next step to continue
16 - Cylinder 3 Fuel Injector -N32-
- Click on -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- Fuel injector must click 5 times after -> button is pressed.
- Click on -> button
Display on VAS5051:
A - Control element test waiting: Select next step to continue
17 - Cylinder 6 Fuel Injector -N84-
- Click on -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- Fuel injector must click 5 times after -> button is pressed.
- Click on -> button
Display on VAS5051:
A - Control element test waiting: Select next step to continue
18 - Cylinder 2 Fuel Injector -N31 -
- Click on -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- Fuel injector must click 5 times after -> button is pressed.
- Click on -> button
Display on VAS5051:
A - Control element test waiting: Select next step to continue
19 - Cylinder 5 Fuel Injector -N83-
- Click on -> button again.
Display on VAS5051:
A - Control element test running: Continuation permitted
- Fuel injector must click 5 times after -> button is pressed.
If one of the fuel injectors is not activated (does not click):
- Check fuel injectors. Fuel Injectors, Checking
- Click on -> button
Display on VAS5051:
A - control element test is completed
- Exit function "03 - Output Diagnostic Test Mode" by pressing <- button.
NOTE: Before restarting the output DTM the engine must be started and the ignition switched off and on again.