Volkswagen 01M Transmission. Manual - part 38

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AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

N88 Solenoid (No. 1 Solenoid)
The N88 Solenoid is an On/Off solenoid and is On and Open in gears 4th through 6th. If this solenoid fails in 
the Closed (Off) position, 4th through 6th gear will not be available.

N89 Solenoid (No. 2 Solenoid)
The N89 Solenoid is also an On/Off solenoid and is On and Open, to allow a line pressure increase when the     
torque converter clutch is applied. When both the N88 and N89 solenoids are energized at the same time, the 
B2 brake clutch is applied in Tiptronic 1st Gear (Manual Low). If the N89 Solenoid fails in the Closed (Off ) 
position, there will be no pressure increase in TCC  and no engine braking in Tiptronic 1st gear (Manual 
Low).

N90 Solenoid (No. 3 Solenoid)
The N90 Solenoid is a normally applied, pulse width modulated solenoid controlling the apply and release 
of the K3 Clutch. When this solenoid is fully Off, the K3 clutch is fully applied. If this solenoid fails in the 
Off (Normally Applied) position, there will be 3rd gear starts  and Reverse application may be firm.

N91 Solenoid (No. 4 Solenoid)
The N91 Solenoid is a normally vented, pulse width modulated solenoid controlling the apply and release of 
the converter clutch, with the ability to ramp the apply and release. When this solenoid is fully Off, the 
converter clutch is fully released. If this solenoid fails in the Off (Normally Vented) position, there will be no 
converter clutch application. 

Solenoid N92 (No. 5 Solenoid)
The N92 Solenoid is a normally applied, pulse width modulated solenoid controlling the apply and release 
of the K1 Clutch. When this solenoid is fully Off, the K1 clutch is fully applied. If this solenoid fails in the 
Off (Normally Applied) position, Drive engagement  will be firm, and there will be a bind in 5th.

Solenoid N93 (No. 6 Solenoid)
The N93 Solenoid is a normally applied, pulse width modulated solenoid and controls the main line 
pressure. When this solenoid is fully Off, maximum line pressure is the result. If this solenoid fails in the Off 
(Normally Applied) position, all shifts will be harsh.

Solenoid N282 (No. 9 Solenoid)
The N282 Solenoid is a normally applied, pulse width modulated solenoid controlling the apply and release 
of the K2 Clutch. When this solenoid is fully Off, the K2 clutch is fully applied. If this solenoid fails in the 
Off (Normally Applied) position, 4th  shift may be firm.

Solenoid N283 (No. 10 Solenoid)
The N283 Solenoid is a normally applied, pulse width modulated solenoid controlling the apply and release 
of the B1 Clutch. When this solenoid is fully Off, the B1 clutch is fully applied. If this solenoid fails in the Off 
(Normally Applied) position, there may be 2nd gear starts..

INDIVIDUAL SOLENOID FUNCTION AND RESULT OF FAILURE

Figure 13

Note:   Refer to Figure 14 for Solenoid Application chart and Clutch Application chart for each gear. You 
will also find an observed Amperage chart from the actual vehicle that you can use for comparison.  This 
should make the diagnosis process much easier for the vehicle that you are repairing.

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Figure 14

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AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

 Solenoids SV3, 5, 9 and 10 are Normally Applied, which applies their assigned component when they are Off.  They are 
Energized (On) to release their assigned component.  These solenoids are also Modulated, to control their assigned 
component apply and release rates.  Consult the charts above to compare the amperage to clutch application.

 Solenoid SV6 (N93) is modulated based on engine load to control main line pressure.   Amperage will decrease to increase 
main line pressure.

T = On in Tiptronic Mode
To = Solenoid is toggled On to Off

Solenoid Shift Sequence

Clutch Application Chart

On/Off

Solenoids

Clutch and Freewheel

Components

Pressure Control Solenoids

Gear

Shift

Position

Park

Neutral
Reverse
1st Gear
2nd Gear
3rd Gear
4th Gear
5th Gear
6th Gear

N89

SV-2

N92

SV-5

N282

SV-9

N90

SV-3

N283

SV-10

N91

SV-4

N93

SV-6

K1

K2

K3

B1

B2

F1

OFF

PWM
PWM

OFF

ON

ON

ON

ON

ON

ON

ON

ON

OFF

ON

OFF

ON

ON

ON

OFF

ON

ON

OFF

OFF

ON

OFF

ON

OFF

OFF

ON

ON

ON

OFF

OFF

ON

ON

OFF

ON

OFF

PWM
PWM
PWM
PWM
PWM
PWM
PWM

PWM
PWM
PWM
PWM
PWM

ON

ON

ON

ON

ON

ON
ON
ON ON

ON

ON

ON

ON

ON
ON

T

T

To

T/To

To

T/To

To

T/To

To

N88

SV-1

SHIFT SOLENOID AND CLUTCH APPLICATION CHART

SOLENOID

RANGE

GEAR

Park

Reverse

Neut

Drive

1

Manual

1

2

3H

4H

5H

6M

3M

4M

5M

6H

SV5-N92 (K1)

SV9-N282 (K2)

SV3-N90 (K3)

SV10-N283 (B1)

SV6-N93 (LP)

SV4-N91 (TCC)

SV2-N89

SV1-N88

.100A
.100A
.980A
.980A
.980A

.200A

0

0

.980A
.980A

.100A

.980A
.980A

.200A

0

0

.980A
.980A
.980A
.980A
.980A

.200A

0

0

.200A

.100A
.980A
.980A
.980A
.980A

.200A

.100A

.980A

.980A
.980A

.740A

1

1

1*- 0

1*- 0

1*- 0

0 -1*

1*- 0

0

0

.100A .100A .100A .980A .980A

1

.980A
.980A

.100A
.860A

.200A

0

0

.980A

.100A

.980A
.980A

.990A

.200A

.100A
.980A
.980A
.980A

.990A

.200A

.100A .100A

.980A

.100A

.740A .740A

.100A

.980A

.990A

.200A

.990A

.200A

.100A= Very Low amperage

  Solenoid OFF

.980A= Very High amperage

Solenoid ON

SV1-N88

 0 =OFF

1=ON

1*-0= ON to OFF

during shift transitions

3H = 3rd Gear TCC OFF

3M = 3rd Gear TCC ON

(This applies to gears 3-6)

SOLENOID OBSERVED AMPERAGE CHART

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SV2-N89

 0 =OFF

1=ON

0-1*= OFF to ON

when TCC is ON

0 -1*

0 -1*

Note: N88 is pulsed ON to OFF during the transitions from 3rd thru 6th gears, although it is not necessary once the K2 Clutch 
is on, as there is pressure fed to the NO.2 Relay valve stroking the valve. 

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AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Figure 15

Solenoid Feed

Blocked

Solenoid Feed

Open

Pressure Out

To Control Valves

Blocked

Pressure Out

To Control Valves

Open

Exhaust

Open

Exhaust

Blocked

Solenoid "OFF"

(De-Energized)

Solenoid "ON"

(Energized)

10 - 16 Ohms

Resistance

On/Off Solenoids (N88), (N89)

ELECTRONIC COMPONENTS (CONT'D)

SOLENOID OPERATION

   These solenoids are the same and both operate in 
exactly the same manner, as shown in Figure 15, 
based on commands from the TCM.  Both of the 
On/Off solenoids are "Normally Closed".
   These two solenoids operate in conjunction with the 
Pulse Width Modulated (PWM) solenoids to provide 
the proper gear ratio for the current road conditions.
   Refer to Figure 15 for operational checks.   Check 
these solenoids for proper resistance with the positive 
lead of Ohm Meter to the terminal and the negative 
lead to the case of the solenoid.   When comparing 
On/Off solenoids, resistance should be within .5 
Ohms of one another.

ON/OFF SOLENOIDS  (N88), (N89),

PWM Solenoid (N91)

PWM Solenoids (N90), (N92),
  (N93), (N282), (N283)

   PWM Solenoid (N91) operates exactly the opposite 
of the other PWM solenoids, in that it is   "Normally 
Vented", as shown in Figure 16.   
   Notice that the solenoid feed oil is fed through a 
.032" orifice, down the side of the solenoid and back 
through a passage to either TCC feed or to exhaust, 
depending on whether the solenoid is On or Off, as 
shown in Figure 16. Check these solenoids for proper 
resistance with the leads of the Ohm Meter across the 
terminals.   When comparing PWM solenoids, 
resistance should be within .5 Ohms of one another.

   PWM Solenoids (N90), (N92), (N93), (N282), and 
(N283) operate exactly the opposite of the (N91) 
PWM solenoid, as they are "Normally Applied", as 
shown in Figure 17.   Even though these solenoids 
look the same, there are different part numbers on 
each of them which would suggest that they may be 
different internally.
   Notice that the solenoid feed oil is fed through a 
.032" orifice, down the side of the solenoid and back 
through a passage to solenoids assigned component or 
to exhaust, depending on whether the solenoid is On 
or Off, as shown in Figure 17. Check these solenoids 
for proper resistance with the leads of the Ohm Meter 
across the terminals.
   Refer to Figure 13 for the component assigned to 
each of these PWM solenoids.   When comparing 
PWM solenoids, resistance should be within .5 Ohms 
of one another.

Electronic Components

Continued on Page 15

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Copyright © 2010 ATSG

Copyright © 2010 ATSG

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

4AM3K03018

4AM3K03018

Solenoid Feed

Solenoid Feed

.032" Orifice

.032" Orifice

Exhaust

(Open)

Exhaust

(Blocked)

Out To TCC

(Blocked)

Out To

Component

(Open)

Out To

Component

(Blocked)

Exhaust

(Blocked)

Exhaust

(Open)

Out To TCC

(Open)

Solenoid "OFF"

(De-Energized)

Solenoid "OFF"

(De-Energized)

Solenoid "ON"

(Energized)

Solenoid "ON"

(Energized)

4.0 - 8.0 Ohms

Resistance

4.0 - 8.0 Ohms

Resistance

Solenoid Feed

Solenoid Feed

.032" Orifice

.032" Orifice

PWM SOLENOID (n91)  "NORMALLY VENTED"

PWM SOLENOIDS (N90), (N92), (N93), (N282), (N283)  "NORMALLY APPLIED"

1

+

1

+

2

2

Figure 17

Figure 16

  Even though these solenoids look the 
same, there are different part numbers 
on each of them, which would suggest 
that they may be different internally.  
"Tag them as they are removed".

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