Volkswagen 01M Transmission. Manual — part 95

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 the apply of the torque converter
clutch. 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
torque converter clutch apply 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, 3rd, 5th and Reverse shifts 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, 1st through 4th shifts may be firm.

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, 5th and 6th shifts 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, 2nd and 6th shifts may be firm.

INDIVIDUAL SOLENOID FUNCTION AND RESULT OF FAILURE

Figure 10

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Technical Service Information

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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AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Figure 11

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 both operate in exactly the same
manner, as shown in Figure 11, 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 11 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 12.
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 12. 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 13.
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 13. Check these solenoids
for proper resistance with the leads of the Ohm Meter
across the terminals.
Refer to Figure 10 for the component assigned to
each of these PWM solenoids. When comparing
PWM solenoids, resistance should be within .5 Ohms
of one another.

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.

Electronic Components

Continued on Page 14

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AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

GAU6A06984

GAU6A06984

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 13

Figure 12

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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.

Solenoid SV4 (N91) is modulated to control Torque Converter Clutch (TCC) apply and release rates, but dependends on the
SV2 (N89) solenoid to be On to stroke the TCC switch valve so that N91 can complete its assigned task. There will be situations
during Manual Tiptronic shifts, SV4 (N91) amperage will indicate .500 - .700 amps and the TCC will be Off, as SV2 (N89) is
"0" which indicates Off.

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

0

0

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

1

.980A
.980A

.100A
.860A

.200A

0

0

.980A

.100A

.980A
.980A

.990A

.200A

3H=0

3M=1

0*-1

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

.990A

.200A

4H=0

4M=1

.100A .100A

.980A

.100A

.740A .740A

.100A

.980A

.990A

.200A

5H=0

5M=1

.990A

.200A

6H=0

6M=1

.100A= Very Low amperage

Solenoid OFF

.980A= Very High amperage

Solenoid ON

SV1&2-N88&89

0 =OFF

1=ON

0*-1= OFF or ON

during shift transitions

3H = 3rd Gear TCC OFF

3M = 3rd Gear TCC ON

(This applies to gears 3-6)

0*-1

0*-1

0*-1

SOLENOID OBSERVED AMPERAGE CHART

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Technical Service Information

Figure 14

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