Opel Power Steering Pump: Difference between revisions

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Added the correct wire gauges and a snapshot from the original Schematic. Corrected the diagnostic information (K-Bus instead of LIN) and added the thread pitch for the high pressure line.
Revised Mechanical Properties and added Fluid section
 
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This type of power steering pump is made by TRW and used in the Opel/Vauxhall Astra G and Zafira A. It's called the "Type 2" or "TRW 2" pump and is known to be quite noisy.
This type of power steering pump is made by TRW and used in the Opel/Vauxhall Astra G and Zafira A. It's called the "Type 2" or "TRW 2" pump and is known to be quite noisy.
[[File:Opel_Astra_Power_Steering_Pump.jpg|alt=|border|right|frameless]]
[[File:Opel_Astra_Power_Steering_Pump.jpg|alt=|border|right|frameless]]
The correct oil for this pump is Fuchs TITAN CHF202 (formerly known as Pentosin CHF202) or anything that fulfills the Opel requirement 19 40 766. It has a green color. [https://openinverter.org/forum/download/file.php?id=12865]
== Electrical Connection [https://openinverter.org/forum/viewtopic.php?p=3771#p3771] ==
== Electrical Connection [https://openinverter.org/forum/viewtopic.php?p=3771#p3771] ==
[[File:TRW 2 Power Steering Pump.png|thumb|Schematic from the Opel Astra G]]
[[File:TRW 2 Power Steering Pump.png|thumb|Schematic from the Opel Astra G]]
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=== Operation & Issues ===
To ensure a quick start up of the pump the signals on the Black and Blue-White wire need to be sequenced. The Black wire indicates that the ignition is on. This alone does not start the pump, probably to save battery capacity for starting the internal combustion engine. Only if there's voltage on the Blue-White wire present the pump starts. This would be connected to the alternator to indicate the engine is running and the alternator provides enough current to feed the power steering pump.


To ensure a quick start up of the pump the signals on the black and blue-white wire need to be sequenced. The black wire indicates that the ignition is on. This alone does not start the pump, probably to save battery capacity for starting the internal combustion engine. Only if there's voltage on the blue-white wire present the pump starts. This would be connected to the alternator to indicate the engine is running and the alternator provides enough current to feed the power steering pump.
Connecting both wires together and feeding them +12V at the same time works as well, but results in slow spool up of the pump.


Connecting both wires together and feeding them +12V at the same time works as well, but results in slow spool up of the pump.
If the Black (+12V Ignition Signal) is connected to constant power rather than switched, the pump will still function, but there will be a parasitic draw of ~200mA when the vehicle is off. This was done experimentally to try sequencing the Blue-White wire with ignition power in order to have a faster start, but the spool up was still slow.
[[File:Opel_Astra_Power_Steering_Pump_Harness.jpg|alt=|border|right|frameless]]


=== K-Bus Communications ===
=== K-Bus Communications ===
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The pump should be connected via an 80A fuse to the 12V. The initial current will be quite high, the idle current should be around 6A without delta pressure from the steering column.
The pump should be connected via an 80A fuse to the 12V. The initial current will be quite high, the idle current should be around 6A without delta pressure from the steering column.


== Mechanical Connection and Dimensions ==
=== LV Connectors ===
The hydraulic high pressure line has an M16x1.5 thread [https://youtu.be/GD5K6TmF5PY?t=350].
Two different sets of connectors have been seen on this pump:
 
1) TE/AMP Superseal 1.5 series
 
* Pump harness (F): 282087-1
* Mating socket (M): 282105-1
* Terminals: 183036-1 (20AWG)
* Seals: 281934-2 (2.4mm ID)
 
[[File:Opel_Astra_Power_Steering_Pump_Harness.jpg|alt=|border|frameless]]
 
 
2) Bosch Kompakt 1.a series
 
* Pump harness (F): 1 928 404 221
* Mating socket (M): 1 928 405 136
* Terminals: BDK 2.8 series
 
[[File:Opel Astra Power Steering Pump Harness (Bosch).jpg|border|frameless]]
 
== Mechanical Properties ==
 
=== Dimensions ===
TBD
 
=== Fittings ===
High pressure side (pump supply/outlet): M16x1.5 thread [https://youtu.be/GD5K6TmF5PY?t=350].
 
Low pressure side (pump return/inlet) is just a hose. The fitting on the reservoir is likely 10mm (3/8").


* Diameter: Return line
=== Mounting Bracket ===
* Thread of high pressure line
WillFab Motorsport (WFM) produces a universal fit bracket for this pump. Available [https://www.willfabmotorsport.co.uk/collections/eps-cradles-brackets here] and [https://www.ebay.co.uk/str/wfmttc here].
* Mounting: Threads, Angle, ...


[[Category:OEM]]  
== Fluid ==
The correct oil for this pump is Fuchs TITAN CHF202 (formerly known as Pentosin CHF202) or anything that fulfills the Opel requirement 19 40 766. It has a green color. [1]
[[Category:Opel]]  
[[Category:Opel]]  
[[Category:Power Steering]]
[[Category:Power Steering]]

Latest revision as of 03:12, 3 October 2025

This type of power steering pump is made by TRW and used in the Opel/Vauxhall Astra G and Zafira A. It's called the "Type 2" or "TRW 2" pump and is known to be quite noisy.

Electrical Connection [1]

Schematic from the Opel Astra G

Pinout and Cables

Wire Colors and Functions
Cable Color Gauge Function
Red 10mm² +12V Supply
Brown 10mm² Chassis Ground
Black 0.75mm² +12V Ignition Signal
Blue-White 0.75mm² Alternator Pin 61
Brown-White 0.75mm² K-Bus Diagnostics

Operation & Issues

To ensure a quick start up of the pump the signals on the Black and Blue-White wire need to be sequenced. The Black wire indicates that the ignition is on. This alone does not start the pump, probably to save battery capacity for starting the internal combustion engine. Only if there's voltage on the Blue-White wire present the pump starts. This would be connected to the alternator to indicate the engine is running and the alternator provides enough current to feed the power steering pump.

Connecting both wires together and feeding them +12V at the same time works as well, but results in slow spool up of the pump.

If the Black (+12V Ignition Signal) is connected to constant power rather than switched, the pump will still function, but there will be a parasitic draw of ~200mA when the vehicle is off. This was done experimentally to try sequencing the Blue-White wire with ignition power in order to have a faster start, but the spool up was still slow.

K-Bus Communications

The pump can be accessed for diagnostics via K-Bus. This has not been reverse engineered yet.

Power Consumption

The pump should be connected via an 80A fuse to the 12V. The initial current will be quite high, the idle current should be around 6A without delta pressure from the steering column.

LV Connectors

Two different sets of connectors have been seen on this pump:

1) TE/AMP Superseal 1.5 series

  • Pump harness (F): 282087-1
  • Mating socket (M): 282105-1
  • Terminals: 183036-1 (20AWG)
  • Seals: 281934-2 (2.4mm ID)


2) Bosch Kompakt 1.a series

  • Pump harness (F): 1 928 404 221
  • Mating socket (M): 1 928 405 136
  • Terminals: BDK 2.8 series

Mechanical Properties

Dimensions

TBD

Fittings

High pressure side (pump supply/outlet): M16x1.5 thread [2].

Low pressure side (pump return/inlet) is just a hose. The fitting on the reservoir is likely 10mm (3/8").

Mounting Bracket

WillFab Motorsport (WFM) produces a universal fit bracket for this pump. Available here and here.

Fluid

The correct oil for this pump is Fuchs TITAN CHF202 (formerly known as Pentosin CHF202) or anything that fulfills the Opel requirement 19 40 766. It has a green color. [1]

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