SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4 cyl. diesel engine with distributor pump | Fuel preparation system Diesel injection | Additional signals: checking

Checking process

–	Connect fault reader -V.A.G 1551- (-V.A.G 1552-). With ignition turned on select “Address code” 01 to select engine control unit.

Indicated on display:

–	Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.

Rapid data transfer                 HELP

Select function XX

Indicated on display:

–	Press keys 0, 0 and 6 for “Display group number 6” and confirm entry with Q key.

–	Observe figure displayed in display field 2. Specification: 0 0 0

Read measured value block

Enter number group values XXX

Indicated on display:

–	Depress the clutch pedal. The left-hand digit should change to 1. Specification: 1 0 0

Read measured value block      6       →

   0 km/h    0    0    0    0.0 %    255

Indicated on display:

–	Allow clutch pedal to return slowly to its resting position.

The left figure should change again from 1 to 0.

–	Press → key.

–	Press keys 0 and 6 for the “End data transfer” function and confirm input with the Q key.

–	Switch off ignition.

If the specification is not obtained:

–	Extract the clutch pedal switch Components' fitting locations, → Chapter.

Read measured value block      6       →

   0 km/h    1    0    0    0.0 %    255

–	Test resistance in switch's contacts. Specification Without depressing clutch: 1,5 Ω Max. Clutch depressed: ∞ Ω (no continuity)

If the specifications are not attained:

–	Renew clutch pedal switch -F36-.

If the specifications are obtained:

–	Switch on ignition.

–	Connect multimeter to measure voltage between contact 2 and earth. Specification: at least 11.5 V

If the specifications are not attained:

–	Check wiring between 4-pin connector, contact 2 and fuse 4 for open circuit using current flow diagram for any short circuits. → Current flow diagrams, Electrical fault finding and Fitting locations

If the specification is obtained:

–	Connect test box -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected.

–	Check wiring for open circuit between test box and connector using current flow diagram. Contact 3 + socket 66 Wire resistance: 1,5 Ω Max.

–	Additionally check wires for shorts to one another, to vehicle earth or to battery positive. Specification: ∞ Ω

If no wiring fault is detected:

–	Renew engine control unit → Chapter

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