Electrical testing

If the On Board Diagnostic (OBD) does not give any indication of the source of the malfunction, work through the complete Electrical testing.
If the On Board Diagnostic (OBD) provides a direct indication of the source of the malfunction, only carry out the test steps recommended in the DTC table (specific testing).

Requirements for test

An Automatic test sequence must first be performed to establish that any malfunctions present in the transmission and engine control modules can only originate from the ABS.

Connect VAG 1551 scan tool and select address word 00 with ignition switched on. See VAG 1551 SCAN TOOL, CONNECTING AND ENTERING ADDRESS WORD .
After completing the Electrical testing, check and erase the DTC memories of the transmission and engine control modules.

The multi-pin connector between the wiring harness and ABS control module (w/EDL) -J104- must be in proper condition, without bent, broken or corroded contacts. Replace any damaged contacts using VAS 1978 wiring repair kit.

Fig 1: Identifying Multi-Pin Connector Terminals - ABS Control Module (w/EDL) -J104-

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NOTE: The instructions supplied with VAS 1978 wiring repair kit normally do not permit repairs to the wiring of the ABS and associated systems. However, this only applies to the screened wiring in the system.

Switch ignition and electrical consumers off before commencing the check (headlights, lighting, fan, etc.).
For test steps 13 to 16 raise the vehicle so that the wheels can turn freely. On vehicles with manual transmission put the gear shift in neutral. On vehicles with automatic transmission move the selector lever to position "N".

The following test equipment is required:

VAG 1551 scan tool or VAG 1552 scan tool
VAG 1598 test box/20
VAG 1594 auxiliary test set
VAG 1526 tester hand-held multimeter
VAG 1310 A pressure gauge

Connecting VAG 1598 test box/20 and testing the ESP system

Switch off ignition.
Remove ABS control module (w/EDL) -J104-
See ABS/ESP SYSTEM COMPONENTS, REMOVING AND INSTALLING .

Unplug multi-pin connector from ABS control module (w/EDL) -J104-
Check multi-pin connector between wiring harness and ABS control module (w/EDL) -J104-.

The socket designations on VAG 1598 test box/20 are identical with the contact designations on ABS control module (w/EDL) -J104- and the designations of the connector on the wiring harness

Connect VAG 1598 test box/20 to multi-pin connector on harness.

Fig 2: Identifying Multi-Pin Connector Terminals - ABS Control Module (w/EDL) -J104-
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Fig 3: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (1 Of 11)

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Fig 4: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (2 Of 11)

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Fig 5: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (3 Of 11)

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Fig 6: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (4 Of 11)

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Fig 7: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (5 Of 11)

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Fig 8: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (6 Of 11)

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Fig 9: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (7 Of 11)

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Fig 10: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (8 Of 11)

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Fig 11: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (9 Of 11)

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Fig 12: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (10 Of 11)

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Fig 13: ABS Control Module (w/EDL) -J104- Connector Terminal Identification (11 Of 11)

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NOTE: For test table:

The socket designations of the VAG 1598 test box are identical to the contact designations of the ABS control module (w/EDL) -J104- in the wiring diagram. Incorrect test procedures can cause damage to the system: do not make connections between any contacts other than those listed in the table

The specified values refer to the readings obtained on VAG 1526 tester and are not necessarily applicable for other test units.
If the readings obtained do not match the specifications, carry out the malfunction repair measures in the right-hand part of the table.

If the specified values are achieved, also check wiring for intermittent loose contacts and short circuit to positive and Ground (GND). This applies especially to sporadic malfunctions.
Use VAG 1594 test leads for checking continuity (bridging leads).
If the measured figures only differ slightly from the specifications, clean the sockets and plugs of the testers and test leads (with contact spray G 000 700 04 ) and repeat the check. Before replacing components, check wiring and connections again, particularly if the specification calls for a resistance reading of less than 10 ohms.

Fig 14: Electrical Test Chart (Test Steps 1 To 3)

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Fig 15: Electrical Test Chart (Test Steps 4 And 5)

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Fig 16: Electrical Test Chart (Test Steps 6 And 7)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 17: Electrical Test Chart (Test Steps 8 To 10)

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Fig 18: Electrical Test Chart (Test Steps 11 And 12)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 19: Electrical Test Chart (Step 13)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 20: Electrical Test Chart (Step 13, Cont.)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 21: Electrical Test Chart (Step 14)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 22: Electrical Test Chart (Step 14, Cont.)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 23: Electrical Test Chart (Step 15)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 24: Electrical Test Chart (Step 15, Cont.)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 25: Electrical Test Chart (Step 16)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 26: Electrical Test Chart (Step 16, Cont.)

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The output connections on ABS control module (w/EDL) -J104- are wired differently for the various different versions.

Fig 27: Electrical Test Chart (Step 17)

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Fig 28: Electrical Test Chart (Step 17, Cont.)

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Fig 29: Electrical Test Chart (Step 18)

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Fig 30: Electrical Test Chart (Step 18, Cont.)

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Fig 31: Electrical Test Chart (Step 19)

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Fig 32: Electrical Test Chart (Step 19, Cont.)

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Fig 33: Electrical Test Chart (Step 20)

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Fig 34: Electrical Test Chart (Step 20, Cont.)

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Fig 35: Electrical Test Chart (Step 21)

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Fig 36: Electrical Test Chart (Step 22)

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Fig 37: Electrical Test Chart (Step 22, Cont.)

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Fig 38: Electrical Test Chart (Step 23)

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Fig 39: Electrical Test Chart (Step 24)

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Fig 40: Electrical Test Chart (Step 24, Cont.)

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Fig 41: Electrical Test Chart (Step 25)

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Fig 42: Electrical Test Chart (Step 26)

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Fig 43: Electrical Test Chart (Step 27)

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