Check Engine Codes - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Check Engine Codes

FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFS: Wranger BRIGHT License Plate LED! Just $3! Great valueRough Country Lift Kits and Parts!

Reply
Unread 01-07-2006, 11:07 AM   #1
rossj711
Registered User
 
Join Date: Apr 2004
Posts: 392
Check Engine Codes

I have these engine codes and I don't understand them.

They go 1 pause 2 pause 5 pause 1 pause 2 pause 1 pause 5 pause 5

I understand 12. Battery disconnect.

51?

21?

Am I correct on those?

rossj711 is offline   Reply With Quote
Unread 01-07-2006, 11:31 AM   #2
greasefingers
Registered User
1994 ZJ 
 
Join Date: Sep 2003
Location: Northern VA, USA, NJ
Posts: 8,237
you forgot 12. Which is no biggie, but it appears that you need a O2 sensor. The code 51 is related to 21.

Extracting Fault Codes:
Turn the ignition switch ON, OFF, ON, OFF, ON and observe the CHECK ENGINE LIGHT. The CHECK ENGINE LIGHT should begin to flash a series of codes. The flashes will be separated by short and long pauses. The long pauses separate the "ones" and "tens" positions, and each code from the next. A code 55 will be displayed at the end of the test.

Diagnostic Trouble Codes - 1995 Jeep

11 IGN reference signal.
12 Battery input to PCM disconnected during last 50 key starts.
13 Fault in the map sensor pneumatic circuit.
14 Fault in the map sensor electrical circuit.
15 Fault in the vehicle speed sensor circuit.
17 Engine running too cool.
21 Problem in the oxygen feedback circuit.
22 Fault in the coolant temperature sensor circuit.
23 Air temperature sensor.
24 Intake air temp. sensor voltage high.
25 Fault in the IAC motor drive circuit.
27 Fault in injector driver interface circuit.
33 Fault in air conditioning cutout relay circuit.
34 S/C solenoid circuits.
35 Fault in fan relay circuit.
41 Fault in the charging system or no field current.
42 Fault in the ASD relay driver circuit.
44 Battery Temp Voltage.
46 Battery voltage is too high.
47 Battery voltage is too low.
51 Lean condition is indicated.
52 Rich condition is indicated.
53 Internal problem in module.
54 No cam position signal.
55 Completion of fault code display.
62 Unsuccessful attempt to update EMR mileage.
63 Unsuccessful attempt to write to an EEPROM location by the controller.
__________________
Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
greasefingers is offline   Reply With Quote
Unread 01-07-2006, 11:31 AM   #3
signalmtnjeep
Registered User
 
Join Date: Jan 2005
Location: Chattanooga TN
Posts: 171
from http://jeephorizons.com/phpbb/viewtopic.php?t=2719

21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor

51 Oxygen sensor stuck at lean position (this may be tripped by a bad MAP sensor system causing a rich condition. If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.
OR
51 Internal logic module fault ('84 turbo only).
__________________
Tripp
-------------
97 chargold ZJ.....4" lift done correctly....SOLD!!!!!!!!!!!!!!
replaced by 91 toyota Straight Axle swapped. (selling)
2004 WJ Overland black 4.7 HO (parents)
Looking for an XJ now.
signalmtnjeep is offline   Reply With Quote
Unread 01-07-2006, 04:45 PM   #4
rossj711
Registered User
 
Join Date: Apr 2004
Posts: 392
Well. Here are more details for a possible diagnosis.

Before I got my edelborck performance headers and flowmaster exhaust, the check engine light would appear usually on the highway when approaching hills and so forth. Maybe the Jeep had difficulty figuring how much gas to send? That would probably indicate a bad O2 Sensor, correct?

After I got my performance exhaust/headers installed, the check engine light will appear no matter what within a few minutes of driving.

Also, I had cracked pcb valves on the tops of the engine gasket, I did some work to them and they appear fine. But this could also be an issue.

Let me know what you think.
rossj711 is offline   Reply With Quote
Unread 01-07-2006, 08:11 PM   #5
greasefingers
Registered User
1994 ZJ 
 
Join Date: Sep 2003
Location: Northern VA, USA, NJ
Posts: 8,237
How is it driving? If itís smooth when cold but irregular once the thermostat opens, then it would support the oxygen sensor.
__________________
Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
greasefingers is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.