Checking solenoid valve whilst driving — VW

Checking solenoid valve whilst driving on VW: factory workshop procedure. Full factory text, tools and checks.

Workshop procedure for VW — the factory write-up, straight from real workshop data.

factory workshop text

📋 Procedure

Interrogate fault memory before checking solenoid valves whilst driving => page
01-18
and rectify faults.

Check wiring to solenoid valves according to Current flow diagram.

The solenoid valves can be checked whilst driving via "read measured value block 08"; "display group number 04".

V.A.G 1551 display zone 1 is 6 figures (0000 00) and is read as follows:

Display field 1:
Display 1 · Display 2 · Display 3 · Display 4 · Display 5 · Display 6
-N88- · -N89- · -N90- · -N91- · -N92- · -N94-
not switched · 0 · 0 · 0 · 0 · 0 · 0
switched · 1 · 1 · 1 · 1 · 1 · 1

The table shows the solenoid valves -N88-, -N89-, -N90- and -N91- controlled in each selector lever position. These solenoid valves control the switching valves to the relevant gears.

During gear changes, control of the solenoid valves may vary from the following table for a short period.

The solenoid valves -N92- and -N94- are supplementary valves which affect selection changes and are only controlled during gear changes and displayed in zones 5 and 6.

On gearboxes up to 12.92 the activation of the solenoid valves will be briefly different to that described in the table when shifting from 3H - 3M and from 4 - 3M.

Gearboxes up to 12.92

Group No. · Display field · Designation · Test conditions · Specified readout on V.A.G 1551 · Rectifying fault if not to specification
04 · 1 · Solenoid valves: / -N88-, -N89-, -N90-, · Selector lever in: · P · 1 0 0 1 00 · The solenoid valves will be switched according to driving conditions.
-N91-, -N92-, -N94- · R · 0 0 0 0 00
N · 1 0 0 1 00
:D1) · 1 · 0 0 0 1 00
2 · 0 1 0 1 00 · - Test steps 6 to 10 and 122)
3H · 0 0 0 0 00
3M · 0 0 1 0 00
4 · 1 1 1 1 00
:31) · 1 · 0 0 0 1 00
2 · 0 1 0 1 00
3H · 0 0 0 0 00
:21) · 1 · 0 0 0 1 00
2 · 0 1 0 1 00
:11) · 1 · 0 0 0 1 00

1)
When driving, a second mechanic is needed for reading the specified values.

2)
=> page
01-56
, Electrical test

Gearboxes up to 01.93

Group No. · Display field · Designation · Test conditions · Specified readout on V.A.G 1551 · Rectifying fault if not to specification
04 · 1 · Solenoid valves: / -N88-, -N89-, -N90-, · Selector lever in: · P · 1 0 0 1 00 · The solenoid valves will be switched according to driving conditions.
-N91-, -N92-, -N94- · R · 0 0 0 0 00
N · 1 0 0 1 00
:D1) · 1 · 0 0 0 1 00
2 · 0 1 0 1 00
3H · 0 0 0 0 00
4 · 1 1 1 1 00
:31) · 1 · 0 0 0 1 00 · - Perform test steps 6 to 10 and 122)
2 · 0 1 0 1 00
3H · 0 0 0 0 00
:21) · 1 · 0 0 0 1 00
2 · 0 1 0 1 00
:11) · 1 · 0 0 0 1 00

1)
When driving, a second mechanic is needed for reading the specified values.

2)
=> page
01-56
, Electrical test

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Workshop data on this page last updated 20 Sep 2026.