Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURES5 SPEED AUTOMATIC 01V FWDSCAN TOOL CONNECTING AND INITIAL CHECKSVAG 1598 PIN OUT BOX: CONNECTION AND USE
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
VAG 1598 Pin Out Box: Connection and Use
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION VAG 1598 Pin Out Box: Connection and Use
NOTES:
- For testing use a Fluke 83 multimeter or equivalent.
- The specified values are valid for an ambient temperature of 10-40°C (50-104°F).
- If measured values deviate from specified values, determine the malfunction using the appropriate wiring diagram.
- If measured values deviate only slightly from specified values, clean the sockets and connectors of the test unit and test leads and repeat the test.
- Before replacing components, check the respective wiring and connectors. Repeat resistance tests when values are below 10 Ohms.
- To connect test units, use test box VAG 1598/20.
- The terminal numbers of the connector and the socket numbers of testbox VAG 1598/20 must be uniform. Refer to "TCM Connector Pin Assignments".
CAUTION: In order to avoid interference with electronic components, switch to the correct test range on the multimeter before connecting the test leads.
Test Requirements:
- Battery Positive Voltage (B+) OK
- Fuses 3, 15 and 31 for Transmission Control Module (TCM) OK
- Fuses for components to be checked OK
- Ground (GND) connections OK
- Check battery GND strap and GND strap between body and transmission.
- Check GND connectors for TCM.
Testing:
- Conduct steps recommended in DTC table only.
- Switch ignition off, remove multi-pin connector from TCM -J217- (located in right side of plenum), and connect test box VAG 1598/20 to wiring harness connector.
If measured values deviate from specified values:
- Carry out all corrective actions listed on right side of electrical test table.
- For testing use a Fluke 83 multimeter or equivalent.
- The specified values are valid for an ambient temperature of 10-40°C (50-104°F).
- If measured values deviate from specified values, determine the malfunction using the appropriate wiring diagram.
- If measured values deviate only slightly from specified values, clean the sockets and connectors of the test unit and test leads and repeat the test.
- Before replacing components, check the respective wiring and connectors. Repeat resistance tests when values are below 10 Ohms.
- To connect test units, use test box VAG 1598/20.
- The terminal numbers of the connector and the socket numbers of testbox VAG 1598/20 must be uniform. Refer to "TCM Connector Pin Assignments".
CAUTION: In order to avoid interference with electronic components, switch to the correct test range on the multimeter before connecting the test leads.
Test Requirements:
- Battery Positive Voltage (B+) OK
- Fuses 3, 15 and 31 for Transmission Control Module (TCM) OK
- Fuses for components to be checked OK
- Ground (GND) connections OK
- Check battery GND strap and GND strap between body and transmission.
- Check GND connectors for TCM.
Testing:
- Conduct steps recommended in DTC table only.
- Switch ignition off, remove multi-pin connector from TCM -J217- (located in right side of plenum), and connect test box VAG 1598/20 to wiring harness connector.
If measured values deviate from specified values:
- Carry out all corrective actions listed on right side of electrical test table.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.