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Volkswagen New Beetle. Manual - part 1782
Possible Effects
Possible effect is increased emissions.
Test Procedures
1. Turn ignition off. Disconnect fuel temperature sensor harness connector, see COMPONENT
LOCATIONS .
2. Measure resistance between terminals No. 4 and 7 at fuel temperature sensor (component side). See Fig.
19 . Resistance should vary with temperature changes. For example, resistance should be 1500-2000
ohms at 86°F (30°C) and 275-375 ohms at 176°F (80°C). See Fig. 17 . If resistance is as specified, go to
next step. If resistance is not as specified, replace injection pump. After repairs, erase DTC memory. See
CLEARING DIAGNOSTIC TROUBLE CODES (FUNCTION 05) under SELF DIAGNOSTIC
SYSTEM. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE
RELEARN PROCEDURE .
3. Turn ignition off. Disconnect ECM harness connector. Connect VAG 1598/31 test box to ECM harness
connector, see CONNECTING VAG TEST BOX (leave ECM disconnected).
4.
Measure resistance between terminal No. 4 at fuel temperature sensor harness connector and socket No.
103 at test box. See Fig. 20 . Measure resistance between terminal No. 7 at fuel temperature sensor
harness connector and socket No. 111 at test box. Both resistances should be less than 1.5 ohms. If
resistances are as specified, go to next step. If any resistance is not as specified, repair open in wiring
between fuel temperature sensor and ECM. After repairs, erase DTC memory. See CLEARING
DIAGNOSTIC TROUBLE CODES (FUNCTION 05) under SELF DIAGNOSTIC SYSTEM. Verify
repair. Test is complete. Perform ECM relearn procedure. See TEST DRIVE RELEARN
PROCEDURE .
5. Measure resistance between terminals No. 4 and 7 at fuel temperature sensor harness connector.
Resistance should be infinite. If resistance is as specified, go to next step. If resistance is not as specified,
repair circuits shorted to each other between fuel temperature sensor and ECM. After repairs, erase DTC
memory. See CLEARING DIAGNOSTIC TROUBLE CODES (FUNCTION 05) under SELF
DIAGNOSTIC SYSTEM. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST
NOTE:
For connector terminal wire colors, see appropriate WIRING DIAGRAM under
ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. For component
locations, see COMPONENT LOCATIONS .
NOTE:
Before replacing any component, ensure all connectors at component and ECM
are clean and tight. After making any repairs, disconnect ECM harness
connector for 10 seconds, connect ECM harness connector and retest system.
It is necessary to generate an ECM readiness code if ECM memory is cleared,
battery voltage is disconnected or ECM is disconnected.
NOTE:
Fuel Temperature Sensor (G81) is an integral part of injection pump.
NOTE:
Test box socket numbers correspond to ECM pin numbers.
2003 Volkswagen New Beetle GLS
2002-2004 ENGINE PERFORMANCE Self-Diagnostics - 1.9L Turbo Diesel - Beetle, Golf & Jetta (Engine Code ALH)
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