Without VAG 1551 Scan Tool
OUTPUT DIAGNOSIS TEST MODEOutput Diagnosis Test Mode (DTM) is provided to check the mechanical motion and the electrical wiring of certain actuators.
The actuators are checked acoustically or by touch. In some cases it might be necessary to use an LED tester for the fuel injectors, as the clicking sound from the injectors is very soft and short. Avoid background noise during audible check of the injectors.
When an audible "click" is heard from the actuator being tested, this only confirms that there is electrical current to the actuator and that the component is operating mechanically. The audible noise does not guarantee perfect component operation. Additional testing may be necessary.
This function can only be carried out with the engine OFF (not running) and the ignition switch turned ON. The Output DTM will be interrupted if the engine is started or if a speed pulse is detected.
COMPONENT CODE AND ACTIVATION SEQUENCE
^ 4411 Fuel Injector cylinder # 1
^ 4414 Fuel Injector cylinder # 4
^ 4413 Fuel Injector cylinder # 3
^ 4422 Fuel Injector cylinder # 6
^ 4412 Fuel Injector cylinder # 2
^ 4421 Fuel Injector cylinder # 5
^ 4443 Fuel Pump Relay
^ 4431 Idle Air Control Valve
^ 4333 Intake Manifold Change-over Valve
^ 4343 Evaporative Emission Frequency Valve
^ 4312 EGR Frequency Valve
The Fuel Injectors are activated 5 times for 2 milliseconds during DTM.
SET-UP PROCEDURE
1. Turn ignition switch OFF.
Relay And Connector Station Locations:
Data Link Connector Location:
2. Raise vehicle hood and locate Auxiliary Relay Station I (drivers side cowl area) and the Data Link Connectors (DLC).
Activating Data Link Connectors:
3. Connect jumper wire with suitable flat-blade connectors and center bridge connector to left terminal of black DLC 1 and left terminal of white/brown DLC 2 as shown in image, do not connect bridge connector (A & B) at this time.
Do-It-Yourself LED Test Light:
4. Connect LED test light, (if needed) to terminals of DLC 1 and 3 using suitable flat-blade connectors. Connect LED tester black lead (-) to the occupied terminal of blue DLC 3 and LED tester red lead (+) to right side terminal of black DLC 1. (Some vehicles only, California vehicles and vehicles with full function MIL use jumper wire only, blink code display is via the MIL)
Fuse Locations 20V:
5. Check that fuses S17 and S19 in the fuse panel are GOOD. Thermofuses S72, S73 and S74 in the electronic control box must also be GOOD.
OUTPUT DIAGNOSIS TEST MODE ACTIVATION PROCEDURE
1. Connect jumper wire bridge connectors (A & B) together.
2. Turn ignition switch ON.
^ MIL or LED tester must light.
^ IF NOT:
^ Check if ignition switch is ON
^ Check LED tester connections
^ Check wires from DLC 2 and 3 to the MPI ECM
3. Disconnect jumper wire bridge connector (A & B) after approximately 10 seconds.
^ MIL or LED tester should start to flash.
4. Count and record codes as they are displayed on the MIL or LED tester, refer to COMPONENT CODE AND ACTIVATION SEQUENCE table at the begining of this article for component I.D.
Output Diagnosis Test Mode Activation:
5. From engine compartment, open and release throttle valve (arrow).
^ When throttle returns to idle position, cylinder # 1 injector will begin clicking on and off.
6. Confirm cylinder # 1 injector is activated, touch or listen for audible "clicks".
7. The MPI ECM will automatically switch to the next injector (# 4) and begin activating it. The component code will be displayed approximately 30 seconds later on the MIL or LED tester. This process will continue until all 6 injectors have been activated.
^ To switch to the next injector without checking, (skip one) connect the jumper wire bridge connectors (A & B) together for at least 4 seconds and then separate, code of component now being activated will display.
Fuel Pump Relay Location:
8. After the MPI ECM activates injector # 5, it will automatically switch to the next component on the activation sequence list, (see activation sequence above) which is the Fuel Pump Relay. To activate it connect bridge connectors (A & B) together for at least 4 seconds, then separate.
^ The fuel pump relay will activate (click) until the ECM is manually switched to the next component.
Idle Stabilizer Valve:
9. Connect the bridge connectors together for at least 4 seconds then separate as before, the ECM will switch and begin activating the Idle Air Control Valve.
Intake Manifold Change-over Valve:
10. Connect the bridge connectors together for at least 4 seconds then separate as before, the ECM will switch and begin activating the Intake Manifold Change-over Valve.
Carbon Canister Location:
11. Connect the bridge connectors together for at least 4 seconds then separate as before, the ECM will switch and begin activating the Evaporative Emissions Frequency Valve.
EGR Frequency Valve:
12. Connect the bridge connectors together for at least 4 seconds then separate as before, the ECM will switch and begin activating the EGR Frequency Valve.
CLEARING DIAGNOSTIC TROUBLE CODE MEMORY
1. Once all components have been successfully checked, connect the bridge connectors together for at least 4 seconds then separate as before, code 0000 (end of output) will display on the MIL or LED tester.
^ Code 0000 display --- 2.5 second flash (zero) at 2.5 second intervals.
2. After display of code 0000 has be achieved, the DTC memory may be cleared. If you DO NOT want to erase the DTC memory, or want to view the stored codes again, turn the ignition switch OFF. However, to clear the codes left in DTC memory AFTER the ignition has been turned OFF, you must once again complete both trouble code extraction AND diagnostic test mode procedures before the codes can be erased. To clear DTC memory, continue to step 3.
3. After display of code 0000 has been achieved, the DTC memory may be cleared by once again connecting the jumper wire bridge connectors (A & B) together for at least 4 seconds then separate. The DTC memory is now CLEAR.
4. After clearing the DTC memory, test drive vehicle for at least 5 minutes (minimum).
5. Activate DTC memory to ensure no new codes have been generated. If no new codes are present, code 4444 will display to confirm.