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Home >> Volkswagen >> 1996 >> Passat Sedan (3A2) L4-2.0L (ABA) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> With Generic Scan Tool (GST) >> Component Checks With VAG 1598/18 Test Box

Component Checks With VAG 1598/18 Test Box



MOTRONIC FUEL INJECTION AND IGNITION SYSTEM AND AUTOMATIC TRANSMISSION, WIRING AND COMPONENT CHECK WITH VAG 1598/18 TEST BOX

NOTES:
- Use multimeter (Fluke 83 or equivalent) and VAG 1527B voltage tester for checks.
- The specifications given are valid for an ambient temperature from 0 ° to + 40 °C (32 ° to 104 °F).
- If the measured values deviate from the specifications, determine malfunction using wiring diagram.
- If the measured values only deviate slightly from specifications, clean sockets and harness connectors on the tester and measuring cables, then repeat check. Before replacing components check wiring and connections. Particularly in cases of specifications less than 10 Ohms, repeat resistance measurement on component.
- To connect the testers to the test box use adapter cables from connector test kit VW 1594.
- The terminals numbers of the terminals and socket numbers in the test box are identical.
- In addition to the checks described in the table, if necessary, wiring must also be checked for short circuit to Ground (GND) (-) or battery positive voltage (B+).

Safety Precautions

WARNING: Be alert when working on or near the engine. High ignition secondary voltage can cause serious personal injury and damage vehicle components.
- DO NOT touch or disconnect ignition system wires when the engine is running or being cranked at starting RPM.
- DO NOT operate the starter if the fuel injectors have been removed.
Be sure the ignition is switched OFF, when:
- Disconnecting ignition wires
- Disconnecting fuel injection system wiring
- Connecting or disconnecting test equipment leads
- Disconnecting the battery
- Washing the engine or engine compartment
BEFORE cranking the engine at starting RPM (such as for compression testing) disable the ignition and fuel injection systems:
- Disconnect the ignition coil power output stage.
- Disconnect harness connectors from all fuel injectors.
- After the work is completed, clear Diagnostic Trouble Code (DTC) memory.

CAUTION: BEFORE disconnecting the battery:
- Stop the engine.
- Be sure the ignition is switched OFF (also applies when connecting the battery). Failure to do so may damage the Engine Control Module (ECM).
- Be sure of the proper radio code (for vehicles equipped with coded anti-theft radio).
Be sure the battery negative (-) cable is disconnected, when:
- Working on the electrical system
- Resistance (spot) welding or electric arc welding anywhere on the vehicle.
When connecting and disconnecting electrical test equipment (LED voltage tester, multimeter, etc.):
- Be sure the ignition is switched OFF.
- Use correct adapters from the VW 1594 connector test kit.
For any work affecting the Engine Control Module (ECM):
- BEFORE disconnecting the ECM harness connector, switch the ignition OFF and WAIT at least 20 seconds. Failure to do so may damage the ECM.
- DO NOT connect any outside voltage source to stimulate an output signal at the ECM.

CAUTION: To prevent damage to electronic components, switch multimeter to correct measuring range before connecting the adapter cable. Observe test conditions and carry out additional work listed in the table.

- Battery voltage OK
- Fuses 15, 18 and 22 OK
- Ground (GND) connections on engine and transmission OK

- Fuel pump and fuel pump relay OK





- With ignition switched off disconnect connector -1- from Engine Control Module (ECM) -J220- -2-.
- Connect VAG 1598/18 test box to wiring harness connector.

- Connect VAG 1598/18 test box to automatic Transmission Control Module (TCM) -J217- connector.

TCM -J217- is located under rear seat. Rfer to "Automatic Transmission, Components". Exploded Views





- Release multi-pin connector in direction of arrow and disconnect control module.





- Install VAG 1598/18 test box onto multi-pin connector -1- and lock, in direction of (arrow -2-).
- Using VAG 1598/18 test box, check wiring according to wiring diagram.

After electrical tests:





- Install multi-pin connector on Transmission Control Module (TCM) -J217- and lock in place.

NOTE: When installing make sure that guides (arrows) are engaged on the control module pins.
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