Deutsch ASL Connectors (MicroLITE Series) are the sensor connector of choice in professional motorsport — specified across GT3, GT, WRC, R5, R2, and LMP racing series worldwide as the standard 5-way interface for throttle position, MAP, oil pressure, coolant temperature, and other low-current sensor circuits. The aluminium shell with conductive black zinc finish, size 23 gold-plated crimp contacts, IP67 environmental sealing, and built-in shrink boot lip make ASL connectors the preferred choice wherever space, weight, and long-term reliability are non-negotiable.
XTRA Motorsport supplies the complete Deutsch ASL range — plugs (body style 6), in-line receptacles (body style 1), and oval flange bulkhead receptacles (body style 0) — across all seven keyway colours: N, A, B, C, D, E, and U. Dispatched worldwide via DHL or UPS.
Panel / bulkhead / firewall mount — two-hole bolt-down flange
1
In-Line Receptacle
Free-hanging inline receptacle for harness-to-harness connections
6
Plug
Free-hanging plug, mates onto body style 0 or 1 receptacle
The first digit of an ASL part number is the body style code: ASL006 = bulkhead, ASL106 = in-line, ASL606 = plug.
Keyway Colour System
Seven keyways prevent mis-mating between sensor circuits. The keyway letter appears immediately before the contact type suffix — for example ASL606-05SA-HE = keyway A, socket contacts.
Keyway
Band Colour
Notes
N
Red
Dedicated or high-priority circuit
A
Yellow
General sensor — most common (throttle, pressure, lambda)
B
Blue
Second sensor circuit
C
Orange
Third sensor circuit
D
Green
Fourth sensor circuit
E
Grey
Fifth sensor circuit
U
Violet
Universal — test / diagnostic harnesses only; plug side only
U (Universal / Violet) keyway — important note: A U-keyed plug mates with any other keyway receptacle (N, A, B, C, D, or E). This makes it the standard choice for test harnesses and service-park diagnostic rigs — one U-keyed lead connects to any sensor circuit on the car without swapping connectors. The U keyway is available on the plug (body style 6) only. There is no U-keyed receptacle: the mis-mate discipline is enforced at the car-side receptacle to prevent accidental cross-circuit connections during normal operation.
Shrink Boot Compatibility
The ASL series shell size 6 housing has a built-in shrink boot lip on the rear for strain relief and environmental sealing of the wire bundle exit. Confirmed compatible boots:
All listed boots are designed for shell size 6 connectors and feature a small 2 mm J-port cable exit — the recovered wire bundle aperture is narrow, keeping the harness exit tight against the connector body. This matters when routing sensor cables in confined spaces around hot engine components or through tight bulkhead apertures.
Part Number Guide
Deutsch ASL part numbers follow a consistent structure:
ASL[body style]06-05[contact type][keyway]-HE
Field
Code
Meaning
Body style
0
Oval flange receptacle (bulkhead/firewall)
Body style
1
In-line receptacle
Body style
6
Plug
Shell size
06
Shell size 6 — fixed for ASL series
Positions
05
5-way — fixed for ASL series
Contact type
S
Socket (female)
Contact type
P
Pin (male)
Keyway
NABCDEU
Keyway letter (see colour table above)
Suffix
-HE
High-performance environmental version
Part number examples:
ASL606-05SA-HE — plug, socket contacts, A keyway (yellow)
ASL006-05PN-HE — bulkhead receptacle, pin contacts, N keyway (red)
ASL106-05SC-HE — in-line receptacle, socket contacts, C keyway (orange)
ASL606-05SU-HE — plug, socket contacts, U keyway (violet, universal)
GT3 / GT / WRC / R5 / LMP — where lower weight is the priority
Choose ASL when mating with existing ASL06 receptacles on a proven race car platform or when shell size 6 is required by the application. Choose ASU where every gram matters and shell size 3 fits the build.
Motorsport Applications
Deutsch ASL connectors are specified or widely used in:
GT3 and GT racing — widely used for throttle position, MAP, oil pressure, and coolant temperature sensor circuits; the 5-way layout and keyway system match the sensor interface conventions common across GT3 and GT platforms
WRC, R5, and R2 rally — widely used in rally harness builds; the keyway system prevents sensor mis-connection during rapid service-park harness changes
LMP and prototype endurance — used in LMP and prototype endurance builds across ACO/FIA WEC and regional series
ECU and PDM sensor inputs — compatible with Pi, MoTeC, AiM, Bosch MS/ME/MDG/MSC ECU connectors and all major motorsport PDM platforms that reference Deutsch Autosport circular sensor interfaces
Firewall bulkhead transitions — body style 0 (oval flange) provides a clean, sealed harness penetration at the firewall; maintains IP67 rating across the panel joint
Test and diagnostic rigs — U keyway (violet) plugs allow a single test harness to connect to any keyway circuit on the car without reconfiguring connectors
Dispatched to your workshop: XTRA Motorsport supplies Deutsch ASL connectors — plugs, bulkhead receptacles, in-line receptacles, and size 23 contacts — across all key keyways. Dispatched worldwide via DHL or UPS.
FAQ
What is the difference between Deutsch ASL, ASU, and ASDD connectors?
ASL (MicroLITE) is shell size 6, 5-way, with size 23 contacts at 3 A — widely used as a sensor connector in GT3, WRC, and LMP builds. ASU (Micro UltraLite) is shell size 3 and 30% lighter, available in 3-way and 5-way. ASDD is a high-density circular series offering double the contact count in the same shell size, used for ECU and data system connectors.
What wire gauge do Deutsch ASL connectors accept?
Size 23 contacts are rated for 22–30 AWG. PTFE-insulated wire (Tefzel / M22759) in 24 or 26 AWG is the motorsport standard for sensor circuits wired to ASL connectors.
Are Deutsch ASL connectors IP67 rated?
Yes. The bonded and sealed insert combined with interfacial wire sealing delivers IP67 environmental protection across all body styles — plug, in-line receptacle, and bulkhead receptacle.
What crimping tools do I need for ASL size 23 contacts?
DMC AFM8 crimp tool with K1413 positioner. For contact insertion and removal: M81969/14-01 (green/white insertion-removal tool, compatible with size 22/23 Autosport contacts).
What is the U (Universal / Violet) keyway?
The U keyway plug mates with any standard keyway receptacle (N, A, B, C, D, or E). It is designed for test harnesses and service-park diagnostic equipment so that a single connector fits any sensor circuit without swapping leads. U keyway is only available on the plug (body style 6) — there is no U-keyed receptacle.
Can I use a heat shrink boot on ASL connectors?
Yes — the housing has a built-in shrink boot lip on the rear. Confirmed fits for shell size 6: Raychem 204W221-25-0 and 202A111-25-G07 (straight), 224W221-25-0 (90°); HellermannTyton 1030-4-G (straight), 1181-4-G (90°).
Where can I buy Deutsch ASL connectors?
XTRA Motorsport supplies Deutsch ASL connectors — plugs, bulkhead receptacles, in-line receptacles, and size 23 contacts — in all major keyways, dispatched worldwide via DHL or UPS.
