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Unread 03-04-2009, 12:48 PM   #1
rudyyj
Registered User
1997 TJ Wrangler 
 
Join Date: Feb 2005
Posts: 303
Check engine light-power steering pressure switch

i'm having a problem with my check engine light/error codes

97 TJ w/4 cylinder

the light is on.
codes:
12--battery disconnected
65--Power steering high pressure seen at high speed. (2.5L only)
55--Completion of fault code display on Check Engine lamp.

65 is not supposed to trigger the MIL
i have replaced the power steering switch--still returns
i have disconnected the switch--still returns
I have jumped the switch--still returns

the way i read the circuit is the switch goes to ground--the PCM sees ground when the switch closes due to high pressure and then ups the RPM for parking lot maneuvers

so, the only thing i haven't checked (tonight) is if the wire going to the switch is damaged and grounding out.

my questions...

1) why is it turning on the MIL--65 is not supposed to turn the light on
2) is there a way to "reprogram" so it doesn't look for the input from the power steering pressure switch?
3) Does the PCM query the switch?... will it give an error if there is no change in the reading for an extended period of time

i need this blasted light off for inspection

scott

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Unread 03-04-2009, 02:45 PM   #2
kloppk
Registered User
1992 YJ Wrangler 
 
Join Date: Oct 2006
Location: Massachusetts
Posts: 2,693
Quote:
Originally Posted by rudyyj View Post
the way i read the circuit is the switch goes to ground--the PCM sees ground when the switch closes due to high pressure and then ups the RPM for parking lot maneuvers
scott
Just the opposite. The switch is normally closed and only opens if it sees high pressure (a heavy power steering demand)

Try connecting the Dark Blue/Brown wire that connects to the switch to Ground and reset the PCM. This should keep the Check Engine light off.


From the FSM...

POWER STEERING PRESSURE SWITCH—PCM
INPUT
A pressure sensing switch is included in the power
steering system (mounted on the high-pressure line).
This switch will be used only on vehicles equipped
with a 2.5L engine and power steering. The switch
(Fig. 9) provides an input to the Powertrain Control
Module (PCM). This input is provided during periods
of high pump load and low engine rpm; such as during
parking maneuvers. The PCM will then increase
the idle speed through the Idle Air Control (IAC)
motor. This is done to prevent the engine from stalling
under the increased load.
When steering pump pressure exceeds 3275 kPa 6
690 kPa (475 psi 6 100 psi), the normally closed
switch will open
and the PCM will increase the
engine idle speed. This will prevent the engine from
stalling.
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Unread 03-04-2009, 02:46 PM   #3
rudyyj
Registered User
1997 TJ Wrangler 
 
Join Date: Feb 2005
Posts: 303
thank you i will try that tonight!!!!

thats the only thing i didn't try...i left it open and in jumped the two wires but didn't ground them...thanks for bringing a fresh idea to my issue

scott

Last edited by rudyyj; 03-04-2009 at 02:56 PM..
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Unread 03-09-2009, 08:17 AM   #4
rudyyj
Registered User
1997 TJ Wrangler 
 
Join Date: Feb 2005
Posts: 303
thank you.... problems fixed

turned out to be a broken wire between the switch and the PCM...
my FSM was wrong...it is a normally closed switch that opens with pressure as was stated above by kloppk.
I decided i didn't need the RPM to increase, it might be more necessary with an automatic. So i just took a wire from the pressure switch wire before the break(near the PCM) and took it to ground. The Pressure switch is normally closed (showing ground to the PCM) until high pressure is seen, now my PCM always sees ground.

scott
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