With 2x2 Pin DLC
NOTE: Read entire procedure before begining. View images as corresponding text is read to ensure all steps and results are clearly understood. Display of Diagnostic Trouble Codes AND completion of the Diagnostic Test Mode MUST be done before it is possible to erase stored codes. Follow all steps exactly and complete entire procedure.ON-BOARD DIAGNOSTICS (OBD)--ACCESS INFORMATION
Note: A Volkswagen VAG 1551 Scan Tool is recommended to access the OBD and display Diagnostic Trouble Codes (DTC).
This is an alternate procedure to access the OBD and display Diagnostic Trouble Codes (DTC). This alternate method uses the Malfunction Indicator Lamp (MIL) to display the Diagnostic Trouble Codes. Trouble codes are displayed as light flash pulses from the MIL (flash pulses are also known as "blink codes" or "flash codes"). To initiate trouble code output first connect the jumper cable OR self-made jumper wire (both described below) to specific terminals of the Diagnostic Link Connectors (DLC). Once the jumper is properly connected to the DLCs, a timed connect-disconnect procedure with the jumper will start the DTC display. Erasing trouble codes and initiation of the Diagnostic Test Mode (DTM) is done using the jumper wire assembly as well.
By correctly and completely following all steps of this procedure a qualified technician can successfully access the Motronic system's On-Board Diagnostics. The data collected will be as accurate and reliable as data received through a scanner.
Jumper Cable Assembly:
JUMPER CABLE ASSEMBLY
Diagnostic Trouble Code display can be achieved using the JUMPER CABLE ASSEMBLY provided with the vehicle (see image) most cars were shipped with one in the trunk or glove box, if not jumper cable #357 971 514E may be obtained from the dealer. If cable is not available use self-made jumper wire assembly described below.
Self-made Jumper Wire With 1/8" Wide Blade Ends:
SELF-MADE JUMPER WIRE ASSEMBLY
Trouble Code display can also be achieved using a SELF-MADE JUMPER WIRE ASSEMBLY (see image) which can be constructed from readily available electrical connectors. The jumper wire shown here and the jumper cable described above are used in the same manner throughout this procedure and will give identical results.
TROUBLE CODE DISPLAY REQUIREMENTS AND SETUP
1. Battery voltage must be GOOD (at least 11.5 volts).
2. Fuse #22 in fuse\relay panel must be GOOD.
3. Ground connections on engine and transmission must be GOOD (grounds located below lower part of intake manifold).
Diagnostic Connector Location:
4. Access the diagnostic connector, which is located under the trim panel at the center console.
Data Link Connector Terminal Identification:
5. Check voltage at BLACK data link connector "A" and note polarity of terminals. Polarity MUST be as shown, if not repair as needed before proceding.
6. The Malfunction Indicator Lamp (MIL) in the instrument panel MUST light up when the ignition is switched ON and go OFF when the engine is shut OFF. If a DTC is stored in memory, the MIL lights even with the engine RUNNING but will shut OFF when engine is shut OFF.
7. If using JUMPER CABLE, connect BLACK jumper cable connector to BLACK DLC connector.
- DO NOT CONNECT THE WHITE CONNECTORS AT THIS TIME.
- If self-made jumper wire is being used proceed to step 8.
8. If using JUMPER WIRE, insert jumper wire blade connector "B1" into BLACK DLC terminal #1 and jumper wire blade connector "B2" into WHITE DLC terminal #1 as shown.
- DO NOT JOIN CONNECTORS "J1" and "J2" AT THIS TIME.
9. The DTC display procedure should be completed with ENGINE RUNNING if possible.
- If engine does not RUN or will not START. Crank engine for 5 to 6 seconds, leave ignition switch ON after cranking.
NOTE: Ignition switch MUST BE LEFT ON after cranking for the entire procedure, failure to do so makes test invalid.
CAUTION: To avoid overheating starter motor, DO NOT crank engine for longer than 15 seconds .
NOTE: Code 2111 (Engine Speed Sensor) and/or code 2113 (Camshaft Position Sensor) should always be displayed when ignition switch is ON and engine is NOT RUNNING. This fault display is normal and can be ignored when displaying trouble codes with engine NOT RUNNING.
However, if the Engine Speed Sensor or Camshaft Position Sensor are suspected of causing the NO START CONDITION they should be tested separately. Use the test procedures at the individual component level.
TROUBLE CODE DISPLAY PROCEDURES
1. START engine and let idle (1300 rpm maximum) or crank engine if no start condition exists.
2. Join WHITE jumper cable connector to WHITE DLC connector. If using jumper wire join connectors J1 and J2 together.
- MIL in dash MUST light up.
- IF NOT:
- Check wires from DLC to the Motronic ECM for open.
- Check jumper connections.
3. After approx. 4 seconds disconnect WHITE jumper connector from WHITE DLC or separate jumper wire connectors J1 and J2 (reverse of step 2).
- MIL will go OFF, come ON for 2.5 seconds, go OFF.
- This confirms display signal has been received.
- MIL will then display (flash) trouble code pulse groups.
- Converting pulse groups to trouble codes found in Step 5.
4. Count MIL flashes and record flash pulse groups as they display from the MIL.
5. Repeat display activation, steps 2 and 3 to display next code as only one code will be displayed for each activation.
Reading Fault Codes:
5. Each blink code is comprised of 4 flash pulse groups with a maximum of 4 flashes per group. Compile the number of flashes in each of the 4 pulse groups to determine the 4 digit code being displayed.
6. If no codes are present, code 4444 will display and no further action is necessary.
7. If codes other than 4444 are present repeat display activation steps 2 and 3 until all codes are displayed.
8. Once all trouble codes have been displayed, code 0000 (end of trouble code output) will display.
- Code 0000 display --- 2.5 second flash (meaning number zero) at 2.5 second intervals.