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Solenoid S6 Fault - How urgent to repair? 

 

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 Post subject: Solenoid S6 Fault - How urgent to repair?
Posted: Thu Feb 07, 2019 6:54 am 
Getting Side Ways
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Posts: 859

Joined: 1st Apr 2005

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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

I have a 696 diagnostic fault code on my EF Falcon XR6. That translates to:

Trans Solenoid S6 Fault - EEC Cannot control the solenoid. Can be caused by open circuit, or short circuit to Ground, +12V

The information I can find on the S6 solenoid is:

S6 is a normally open On/off solenoid that sets the high/low level of line pressure, Solenoid off gives high pressure.
The primary regulator valve (PRV) (refer to figure 3.19) regulates the transmission line pressure (or pump output pressure). This valve gives either high or low line pressure depending on whether S6 is switched Off or On, When S6 is switched On, S6 pressure is applied to the PRV moving it against spring pressure and opening the line pressure circuit to the pump suction port resulting in reduced line pressure. Low line pressure is used during light throttle applications and cruising. Heavy throttle will cause S6 to switch Off and thereby cause high line pressure.
This stepped line pressure control has no detrimental effect on shift feel because all shifting pressures are controlled by separate band and clutch regulator valves, and the output of S5.

Based on this info, if S6 is not controlled by the ECU, line pressure will be permanently set to high. I haven't noticed any significant transmission issues. It will occasionally thump on a light throttle shift. But the difference in line pressure between Econ and Power does not appear to have been affected. So, I am happy to run the car with this fault until I have the time to get it fixed.

But, am I doing the car any damage by running with the line pressure permanently set to high? For example, would that generate extra heat in the transmission? Thanks for the help.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported 4-angled EF XR6 head, SS Inductions, Territory intake, 10:1 CR, Auckland 1258 cam, Coby headers, no cat, Tickford 2.5", 2850rpm stall, J3 chip

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 Post subject: Re: Solenoid S6 Fault - How urgent to repair?
Posted: Mon Feb 11, 2019 8:39 am 
Getting Side Ways
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Age: 56

Posts: 869

Joined: 12th Aug 2007

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Ride: AU2 XR8 ute & 91 EA bitsa

Location: Melbourne
VIC, Australia

I'd get the solenoid checked ASAP. You run the risk of seals leaking/failing and parts in the box not being cooled properly with prolonged use.

 

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AU2 XR8 with Raptor VL, ported Yella Terra GT40P heads, Scorpion 1.6 RRs, XE264HR-14 Comp Cam, ceramic coated Hurricane Headers, 60lb injectors, Walbro 255, 200cfi cats, 3" exhaust & Snow Performance water methanol injection

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