Fuel Pump (FP) Control Module J538 , checking (vehicles with 4-cyl. TFSI engine)

Fig 1: Identifying Special Tools - Fuel Pump (FP) Control Module J538 , Checking (Vehicles With 4-Cyl. TFSI Engine)

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Special tools, testers and auxiliary items required

Portable multimeter V.A.G 1526 B
Connector test set V.A.G 1594 C
Adapter cable V.A.G 1598/39
Test box V.A.G 1598/42

Test conditions

Battery voltage at least 12.5 V.

Fig 2: Identifying Main Fuse Panel

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Fuse on fuse panel S228 (position 28) OK.
Ignition switched off.

Check voltage supply for Fuel Pump (FP) (from Fuel Pump (FP) Control Module J538)

Remove rear seat bench →
- 72 - SEAT - FRAMES
- 72 - SEAT - FRAMES for BODY INTERIOR - CABRIOLET
.

Fig 3: Removing Cover Bolts For Locking Flange

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Unbolt cover for right locking flange - arrows -.
Fold protective boot back.

Fig 4: Connecting Hand Multimeter V.A.G 1526 B With Measuring Probes And Connector Adapters From Connector Test Set V.A.G 1594 C Or V.A.G 1594 A Between Clamp

Courtesy of VOLKSWAGEN UNITED STATES, INC.

For voltage testing, connect the hand multimeter V.A.G 1526 B with measuring probes and connector adapters from the connector test set V.A.G 1594 C or V.A.G 1594 A between clamp - 1 - and - 4 - , as shown in illustration. The electrical connection remains connected.

NOTE:

Connector sockets are numbered respectively on the rear side of the connector.

Start engine.

Specified value during start and while running at idle: 4 to 5.7 V.

Depress accelerator pedal completely and then release it (brief throttle burst).

Specification: The voltage value must first rise slightly, then fall and then rise again to the previously read value.

If the reading does not result as described:

Check voltage supply and activation of Fuel Pump (FP) Control Module J538.

Check voltage supply for Fuel Pump (FP) Control Module J538

Remove Fuel Pump (FP) Control Module J538 → Fuel Pump (FP) Control Module J538 , removing and installing .

Fig 5: Identifying Fuel Pump (FP) Control Module J538

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Disconnect electrical harness connector - arrow - on Fuel Pump (FP) Control Module J538.

Fig 6: Identifying Engine Control Module (ECM) 5-pin Connector Terminals 1 & 5

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Connect multimeter between terminal - 3 - and - 4 - of harness connector for voltage measurement.
Switch ignition on.

Specification: approx. battery voltage.

If specification is not obtained:

Repair open circuit in wiring according to wiring diagram.

Check activation of Fuel Pump (FP) Control Module J538

Remove protective cap.

Fig 7: Connecting Multimeter With Measuring Probes And Connector Adapters From Connector Test Set V.A.G 1594 C Between Clamp

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For voltage testing, connect the multimeter with measuring probes and connector adapters from the connector test set V.A.G 1594 C between clamp - 4 - and - 5 - , as shown in illustration. The electrical connection remains connected.

NOTE:

Connector sockets are numbered respectively on the rear side of the connector.

Start engine.

Specified value during start and while running at idle: approx. 5.0 V.

Depress accelerator pedal completely and then release it (brief throttle burst).

Specification: The voltage value must first rise slightly, then fall and then rise again to the previously read value.

If the reading does not result as described:

Switch off ignition.

Fig 8: Connecting Test Box V.A.G 1598/42 To Wiring Harness With Adapter Cable V.A.G 1598/39-1 Or Adapter Cable V.A.G 1598/39-2

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Connect test box V.A.G 1598/42 to wiring harness with adapter cable V.A.G 1598/39-1 or adapter cable V.A.G 1598/39-2 ; engine control module (ECM) remains connected. Clamp test box Ground (GND) clip to battery negative terminal →
- 24 MULTIPORT FUEL INJECTION (MFI) for 1.8 LITER 4-CYL. 5V TURBO FUEL INJECTION & IGNITION, ENGINE CODE(S): AMB
- 24 - MULTIPORT FUEL INJECTION (MFI) for 2.0 LITER 4-CYL. 4V TURBO FUEL INJECTION IGNITION, ENGINE CODE(S): BPG, BWT
- 24 MULTIPORT FUEL INJECTION (MFI) for 3.0 LITER 6-CYL. 5V FUEL INJECTION & IGNITION, ENGINE CODE(S): AVK, BGN
- 24 - FUEL INJECTION SYSTEM for 3.2 V6 4V FUEL INJECTION IGNITION, ENGINE CODE(S): BKH
- 24 - MULTIPORT FUEL INJECTION (MFI) for 4.2 LITER V8 4V FUEL INJECTION AND IGNITION, ENGINE CODE(S): BNS
- 24 MULTIPORT FUEL INJECTION (MFI) for 4.2 LITER V8 5V FUEL INJECTION AND IGNITION, ENGINE CODE(S): BHF
.

CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.

Fig 9: Identifying Engine Control Module (ECM) 5-pin Connector Terminals 1 & 5

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Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:

Harness connector Terminal	Test box V.A.G 1598/42 Socket
- 5 -	B 27

Repair wiring open circuit or short circuit according to wiring diagram.

If no malfunctions are detected:

Replace Fuel Pump (FP) Control Module J538.