EAS Re-calibration

[enery8]

Morning all and welcome to the new members since I last visited, looks like I am going to have to drop in more often :)

I want to recalibrate my air suspension using Hawkeye and wondered if anyone has done this or can give any info.  Basically, how to is the question.  Is it automatic, do you need to measure wheel centre to wing, is there any other equipment needed, ie land rover tools? 

best regards

Bill

[Alun Phillips]

Please could you tell me what vehicle it is.

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[enery8]

Morning Alun, It is a P38 Range Rover

On Monday, 14 May 2012 07:54:24 UTC+1, Alun Phillips wrote:



[dyonysios (safemail)]

I'd be interested in this. On mine (P38, Hawkeye V5) the Hawkeye will display a set of disclaimers warning that this is not a full calibration and to use testbook to achieve that, but then it does go ahead and do something. There is no way to input heights so I don't really know what it does; reset the "stops" for Standard, Access and Extended perhaps to some previously memorised value?

---

From: enery8 <ener...@googlemail.com>
To: hawkeye-u...@googlegroups.com
Sent: Monday, May 14, 2012 4:45 PM
Subject: Re: EAS Re-calibration

[Alun Phillips]

T 4 USES 3 SETS OF BLOCKS THAT THE VEHICLE SITS ON , BY THE BUMP STOPS,  THAT'S WHY HAWKEYE CAN NOT CARRY OUT FULL CALIBRATION,SORRY, YOU CAN WORK AROUND IT THOUGH IF YOU SEND THE VEHICLE UP AND DOWN 3 TIMES ON A FLAT SURFACE IT USUALLY CLEARS THE FAULT IF ALL THE SENSORS ARE GOOD , WORTH A TRY .OR BATTERY RESET ,   

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[dyonysios (safemail)]

Hi Alun,

Thanks for that explanation.  However can you tell us what the Hawkeye actually does when it re-calibrates? Does it write some stored values to the EAS ECU, does it clear any buffers, what actually happens when I click on the check mark?

Cheers

Rasheed

---

From: Alun Phillips <al...@bearmach.com>
To: hawkeye-u...@googlegroups.com
Sent: Tuesday, May 15, 2012 9:04 PM
Subject: Re: EAS Re-calibration



[Alun Phillips]

Its a bit all above me that question, I will pass on your question to the engineers, perhaps they can explain why hawkeye can not calibrate the air suspension better than myself. Thanks Alun

[dyonysios (safemail)]

Hi All,

Still on the EAS unfortunately!  I've a slight leak at the drain plug on the reservoir.  Have ordered a new plug but meanwhile I managed to raise the car (which took ages) and decided to try and disable the EAS so it would just stay put.  The manual overide button sometimes works for this but I know that removing the delay timer relay (under the passenger seat) is more reliable.  I had the hawkeye plugged in and ignition on just before this and it was fine. After taking  the relay out the next time I turned the ignition on it beeped EAS fault and speed limit. With the relay unplugged the Hawkeye would not connect. Kept asking if the cable was connected and ignition on and then finally said serial error, try reconnecting the device.  Ok so then I replaced the relay. Still won't connect.

So here's the sequence:

Hawkeye working

Relay unplugged - Hawkeye not working

Relay plugged back - Hawkeye still not working.

What might I have done??  Scared now!

Cheers

Rasheed

---

From: Alun Phillips <al...@bearmach.com>
To: hawkeye-u...@googlegroups.com

Sent: Tuesday, May 22, 2012 2:21 PM
Subject: Re: EAS Re-calibration

[dyonysios (safemail)]

Can anyone (Alun!) help with understanding what hawkeye is reading when it reports faults?  First I'm having trouble clearing faults. What could be the reason for this?  I am using the correct cable, I am able to enter the system (and all other systems too), I can read faults, I have version 5 of the software.  

Second I have a left blend motor "feedback" fault and distribution motor "feedback" fault. What exactly does that mean? Can anyone tell me what the expected voltages are, the reference voltage and output range?  I am thinking of using a meter directly on the connector pins but I need to know what I am looking for. Incidentally, the motors are fine, pots have been replaced and I have run them on the bench.

Cheers,

Rasheed

[Alun Phillips]

Symptoms and Diagnosis

A stuck blend motor will usually cause the book symbol and exclamation mark to be displayed on the HEVAC LCD panel. However, to narrow down the cause of the fault message, the following diagnostics may help.  The symptoms listed below can all indicate blend flap servo motor failure, but before tearing into the dash, check for blown HEVAC fuses (8 and 17) which can also cause all these symptoms. Also, if the system will not emit any hot air at all, the problem may also be due to blocked heater hoses.

 

1. Heater emits cold air only only or or hot air only to driver or passenger sides: The left or right temperature vent flaps may be stuck in closed or open position due to failed servo motors. These servos, known as the temperature or blend servos, govern the blends of hot and cold air sent to the driver and passenger sides depending on their different whims, and are each mounted in a horizontal orientation on the left and right sides of the main heater housing at the centre of the console.

2. Hot or cold air emitted to demister only, fascia only, fascia and footwell only, or footwell only. This can indicate the heater distribution vent flap is stuck in the demist, fascia, fascia/footwell, or footwell positions due to a failed distribution servo motor. This motor is mounted in a vertical orientation on the right hand side of the central heater unit just above the RH temperature vent flap servo. (Note that this servo is mis-identified in the official drawing number 82M-0572 in the shop manual, where the labels for the right hand temperature blend motor and the distribution motor are interchanged). You can test its operation by trying the different settings on the bottom row of buttons on the HEVAC control panel which control the air distribution, and seeing if the air comes out where it should in each setting.

 

3. Heater emits recirculated or ambient air only: This can indicate an air inlet housing vent flap is locked in the closed (recirculate) or open (ambient) position due to servo motor failure. These motors are referred to in the shop manual as the left and right recirculation flap servos, and are mounted peripherally on the blower motors located behind the pollen filters and forward of the extreme left and right fascia vents.

 

Photo at right: Blower motor at extreme left of dash (photo taken by Ron Beckett in a partially dismantled vehicle). Left recirculation flap is mounted on this motor but not visible in this photo.

 

The two servos in item 1 above, and the single servo in item 2 above, are the three items usually referred to as the notorious "blend motors" and sold as official parts in a set of three. It is the replacement of these three motors that the remainder of this page is devoted to. However, note that the other two servos mentioned in item 3 above, although less publicized, can cause trouble too. Occasionally the blend flaps themselves, rather than the motors, can be the culprit, necessitating a whole new heater box. However this is unusual -- normally it is just the servo motors at fault.

 

Root causes of these failures include lack of attention to regular replacement of the pollen filters -- see the pollen filter replacement page.

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[Alun Phillips]

Have a look at this and see if it helps I can not remember the web sight I had it off but will check and send to you when I fined it,,

 

Thanks ALUN.

[Alun Phillips]

www.rangerovers.net/repairdetails/blendmotor.html    try this might help  ALUN

 

From: dyonysios (safemail) [mailto:dyon...@yahoo.com]
Sent: 01 September 2012 12:46
To: hawkeye-u...@googlegroups.com
Subject: HEVAC fault P38

 

Can anyone (Alun!) help with understanding what hawkeye is reading when it reports faults?  First I'm having trouble clearing faults. What could be the reason for this?  I am using the correct cable, I am able to enter the system (and all other systems too), I can read faults, I have version 5 of the software.  

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[Alun Phillips]

 

 

From: Alun Phillips [mailto:al...@bearmach.com]
Sent: 03 September 2012 08:46
To: hawkeye-u...@googlegroups.com
Subject: RE: HEVAC fault P38

 

www.rangerovers.net/repairdetails/blendmotor.html    try this might help  ALUN

[dyonysios (safemail)]

Alun,

Thank you so much for those.  I've come across some of it in my own web meanderings but its kind of you to put them together in one place.

My question to you however is more about how the diagnostics works and about the control and reference voltages.  What is my Hawkeye saying when it reports a "feedback" fault"? Does it mean its getting the wrong reference voltage or that its not getting any voltage? Which pin or pins in the OBD II connector are related to HEVAC and what information is actually conveyed to it by the HEVAC head unit? If I were to test the pin-outs directly with a meter, what are the values I should expect?

I have repaired all the blend motors by replacing any stripped cogs and upgrading the potentiometers.  All of them can be shown to run on the workbench with 12V directly.  The actual flaps move smoothly enough when pushed with a finger. Yet the servos aren't taking commands from the hevac head unit (ie harness connected but motors not put back in place or connected to the flaps) and  I get the faults in Hawkeye. "Feedback" faults.  One person told me that the motors and flaps need to be connected or it will show a fault.  I can't see how unless its reading the presence or absence of a load on the blend motors; is this true? This is where I need help! I am in effect trying to diagnose the head unit.

If you or anyone happens to have a circuit drawing or a connector pin out diagram with the reference and command voltages I think I'd be very grateful indeed!

Cheers

Rasheed

---

From: Alun Phillips <al...@bearmach.com>
To: hawkeye-u...@googlegroups.com

Sent: Monday, September 3, 2012 1:48 PM
Subject: FW: HEVAC fault P38

[Alun Phillips]

Recommend  the workshop manual

[dyon...@yahoo.com]

Hello All

I need to clear an airbag fault on my 96 V8 P38. But even with the right cable and grey adapter, Hawkeye is not able to link with the system. I am able to access all other systems such as EAS, BECM, ABS, HEVAC. Any advice would be most welcome!

VIN: TA340965

Cheers,

Rasheed