Opel Power Steering Pump: Difference between revisions

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Created page with "Pump:<br> frameless|border <br> <br> Harness:<br> frameless|border <br> <br> Us..."
 
Revised Mechanical Properties and added Fluid section
 
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Pump:<br>
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|frameless|border]]
[[File:Opel_Astra_Power_Steering_Pump.jpg|alt=|border|right|frameless]]
<br>
== Electrical Connection [https://openinverter.org/forum/viewtopic.php?p=3771#p3771] ==
<br>
[[File:TRW 2 Power Steering Pump.png|thumb|Schematic from the Opel Astra G]]
Harness:<br>
[[File:Opel Astra Power Steering Pump Harness.jpg|frameless|border]]
<br>
<br>
Usage:


From Arber333:
=== Pinout and Cables ===
<blockquote>
{| class="wikitable"
So here is how the pump works.
|+Wire Colors and Functions
- Connect thick red wire on live 12V via 80A fuse.
!Cable Color
- Connect thick brown wire to car chassis as negaitve lead.
!Gauge
- Driver provides ignition 12V and pump should get this signal via thin Black wire.
!Function
- starts engine and pump gets the signal from live alternator voltage via thin blue/white wire.
|-
|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
|}


In former case pump will spool up at once and provide steady pressure. It will draw some 6A of current with no delta pressure at the steering end.
=== Operation & Issues ===
You can connect both thin wires to 12V at the same time too however. In that case pump will start, but will spool up really slowly.
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.


Normally i use one 12V relay in a car to signal 12V ignition live to other support elements inside car. I connect there coolant water pump, DCDC enable signal, power to inverter , precharge relay, vacuum pump and of course EHPAS pump black wire.
Connecting both wires together and feeding them +12V at the same time works as well, but results in slow spool up of the pump.
When i turn to start the car i have one latching (or two) relay to provide "engine on" signal for car computer. I connect blue/white wire here nd as soon as i start inverter power steering is on!
 
</blockquote>
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)
 
[[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").
 
=== Mounting Bracket ===
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].
 
== 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: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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