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Unread 12-12-2012, 09:29 PM   #1
papitt
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1995 ZJ 
 
Join Date: Dec 2008
Location: Stephenville Texas 76401, Texas
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Check Engine Light

.. My CEL is coming on But may go off after the next time I crank it .
.. I'm not ready for it to go to town yet. As I don't have Ins. or license and it's not titled to me yet.
So I can't drive it to town the have the code read. The Information center is not working. So is there another way to read the codes .Turn key on read in mile location in speedometer . OR what.

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Unread 12-12-2012, 09:34 PM   #2
McCloudsZJ
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I'm about 90% sure this is the right procedure for the OBDI ZJs:

Quote:
On 1991 to1997 models ( 1984 to 1986 V6 models as well as 1998 to 2002 follow ) you have a way of reading for fault codes which can be accessed without any scanners like other models by reading how the check engine light flashes. Start by turning the ignition key to the last stop before it starts, on and off three times within 5 seconds ending in the on position on the third time, ( i.e. on, off, on, off then on and leave ), ( OBDII 96-97, 4 times ) . The check engine light will start to flash quickly with a small pause in between then a medium pause to indicate the next number in the to digit number and then a long pause before the next set of flashing for the next code. If all is well you will get a code 55 which would read like this: 5 fast flashes, medium pause then a further 5 flashes. This is how all codes end with is this 55 code if you have air conditioning or with a code 33 without and any other codes would have been before it separated by a long pause. The codes will remain after this test so you can cycle through it as many times as it takes to read them. After a problem has gone the code will be removed after 50 on off key cycles or if the battery left disconnected over night which will cause a code 12 though.
Then to read what the flashes mean:

Quote:
  • 11 No crank signal to computer. Fault in wiring between crankshaft position sensor (CPS) and ECM ( PCM or computer ) or faulty CPS.
  • 12 Battery disconnected. Battery or power to the ECM disconnected in the last 50 key cycles.
  • 13 MAP Sensor. No change in Manifold Absolute Pressure (MAP) between engine off and on. Check circuit and MAP sensor.
  • 14 MAP Sensor. MAP sensor voltage too high or low. Check circuit and sensor.
  • 15 Speed sensor or circuit. No signal detected from speed sensor. Check circuit and sensor.
  • 17 Engine running too cold. Wrong or faulty thermostat. Check also sensor and circuit for fault.
  • 21 Oxygen sensor or circuit. O2 sensor or wiring faulty.
  • 22 Coolant sensor or circuit. Check temp sensor and wiring.
  • 23 Intake air temp or circuit. Check air temp sensor and wiring.
  • 24 Throttle Position Sensor (TPS) Check TPS sensor and wiring.
  • 25 Idle Air Control circuit (IAC) Check IAC sensor and wiring.
  • 26 Injector circuit resistance. Peak injector current has not been reached or injector circuits have resistance
  • 27 Fuel injector control circuit. Will need specialist diagnostics.
  • 31 Evaporative control circuit. Fault in fuel evaporative control circuit or hoses.
  • 33 Air conditioning clutch relay. Wiring to A/C clutch fault.
  • 34 Cruise control circuit. Fault in circuit.
  • 35 Cooling fan relay. Check relay and circuit.
  • 36 Air switch solenoid circuit. Air switch solenoid circuit (non-turbo) or the waste gate solenoid on turbocharged models
  • 37 Torque converter clutch. Needs specialist or dealer diagnostics.
  • 41 Alternator field switch. Switch not operating correctly and check charging system.
  • 42 Automatic shutdown relay. Check relay and circuit. Needs specialist or dealer diagnostics.
  • 43 Misfire. Misfire in one or more cylinders.
  • 44 Battery temperature sensor. Needs specialist or dealer diagnostics.
  • 46 Battery over voltage. Check charging system.
  • 47 Battery under voltage. Check charging system.
  • 51 O2 detects lean mixture. Check sensor and circuit and for vacuum leaks.
  • 52 O2 detects rich mixture. Check fuel injection system and sensor.
  • 53 Powertrain Control Module. PCM (ECM) fault. Needs specialist or dealer diagnostics.
  • 54 Distributor sync pickup. Change sync sensor in distributor.
  • 55 End of code. Trouble codes finished or none recorded.
  • 61 BARO solenoid BARO solenoid failure
  • 62 Emissions reminder. Emissions maintenance reminder. Needs specialist or dealer diagnostics.
  • 63 Controller failure. EEPROM write denied. Needs specialist or dealer diagnostics.
  • 64 Flexible fuel sensor. Flexible fuel (methanol) sensor indicates concentration sensor input more/less than acceptable voltage
  • 65 Manifold tune value. Manifold tune valve solenoid circuit open or shorted
  • 66 TCM to PCM failure. No message from the Transmission Control Module (TCM) to the Powertrain Control Module (PCM)
  • 72 Catalytic converter circuit. Needs specialist or dealer diagnostics.
  • 76 Fuel pump bypass relay circuit. Needs specialist or dealer diagnostics.
  • 77 Cruise control system. Check power to cruise control solenoids.
__________________
March 2014 GCOTM. 1998 Deep Slate 5.9
On the Jeep:Hot intake, 52mm TB, Summit 8mm wires, catch can, 703s, insulated fuel rails, indexed Champions, Bilstein 4600s, Eibach lowering springs, Moog SS, Ironman mounts, Lotek 2GP, lots of gauges, sparkly paint.
In the garage: M1 4bbl
In the works: Addco/Hellwig sway bars, nitrous, full polly bushings, full exhaust, data logging, billet UD pulleys
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Unread 12-13-2012, 06:02 PM   #3
papitt
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Reading thru those codes I got to thinking of what they could have done or left undone when they had the trans out. Most obvious I guess would be the O2 sensors. Either broken or not hooked up correctly. Or I guess they could have even frayed a wire. The O2 sensor would turn on the check engine light. And also give it that slightly ruff idle that I've had since it came home from the mechanic shop. Maybe It'll be warn this week end so I can get under it.
.. Also I have 3 Grand Sons that will be here this weekend. They are 17 & all love to get their hand greasy ON PaPitt's rides.
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Unread 12-14-2012, 11:48 AM   #4
ratmonkey
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The key on/off trick is the only way to get the codes without buying your own obdi scanner. Parts stores do not read codes on obdi vehicles.

Pull the codes and report back what you get instead of guessing.
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Unread 12-15-2012, 02:13 AM   #5
papitt
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...10-4 We'll see what tomorrow brings ..
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Unread 12-17-2012, 09:26 PM   #6
papitt
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.. OK So my VIC must be working better than I thought .. After I got the date set . It was flashing but not beeping . Say low coolant and oil level low.
.. So I Read McCloudsZJ post about how to read the codes . And it worked .. I had a code 22 .. low coolant sensor .. and a code 55 finished..
... Great now if I can find that that coolant sensor. I looked on the radiator but I did not find it's location.
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Unread 12-18-2012, 05:22 AM   #7
KoreaZJ
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Quote:
Originally Posted by papitt View Post
... Great now if I can find that that coolant sensor. I looked on the radiator but I did not find it's location.
Check the coolant overflow bottle.

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Unread 12-18-2012, 06:00 AM   #8
ratmonkey
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The Vic and cel codes are completely separate entities.
The coolant level low indicates the level sensor in the overflow tank is stuck, bad, or actually low on coolant.
Code 22 indicates the coolant temperature sensor on the thermostat housing is reading out of range and is bad.
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Unread 12-18-2012, 07:34 AM   #9
papitt
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OK RatMonkey that explains why the temp looks alittle cool like only about 175 never 205
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Unread 12-18-2012, 07:53 AM   #10
KoreaZJ
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Quote:
Originally Posted by papitt View Post
OK RatMonkey that explains why the temp looks alittle cool like only about 175 never 205
Cluster temp gauge reading comes from the sending unit between the rear end of the Cylinder Head Cover and fuel rail.

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Unread 12-18-2012, 08:43 AM   #11
ratmonkey
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The computer reads from a different sensor than the gauge.
Theres no cross over between them.
Could be a stuck open stat.
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Unread 12-18-2012, 08:05 PM   #12
papitt
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Yes I forgot that temp sensor was on the back of the head. On my 1st I had to replace the head and I had left that sensor out when I fulled it with antifreeze. I sure had a sinking feeling for a few minutes until I found that hole.
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Unread 01-13-2013, 06:05 PM   #13
papitt
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Wonder why I keep getting the no.12 code ... battery disconnect code. None of my clock radio or other items seem to have been disconnected in a couple months . And code 21 for the O2 sensor .. I haven't had the time to find it. But I bet it's most of the problem .
... bUT I'VE HAD WAY TOO MANY vehicle troubles lately. My Haul tr 2000 dodge diesel is have trans issue but it's not setting any code yet. Then my Diesel Bronco 4BT it died yesterday and wont restart. It just does this when it cold . But give me a break 45* is cold. And this Jeep one day the trans leaks and next 3 days it's dry . CEL will be off for a 3 days and back on .And the Grizzle 650 4 wheeler I just got it running again after 1 1/2 years .
... Are we having fun yet.
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Unread 01-13-2013, 06:58 PM   #14
KoreaZJ
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Quote:
Originally Posted by papitt View Post
Wonder why I keep getting the no.12 code ... battery disconnect code. None of my clock radio or other items seem to have been disconnected in a couple months.
Takes 50 times "key ON" to clear. Any glitch from a loose connection and it starts over at 50 again.
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Unread 01-15-2013, 10:06 PM   #15
papitt
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Man I drove this over to the gun shop & shooting range this evening and it had another problem .. As I Got up to about 50mph. It began to surge If I let off it ran fine just driving down the hwy. But any throttle at 50 and it just increased about 400 to 500 rom and the drop back down same amount. I'd say it acts like a bad fuel pump but man that would be the 3rd one on ZJ in a year . I've had 3 ZJ's this year .Gave the others to my Grand Kids. I'm beginning to question these ZJ'S But I'd like to have one for myself. P/S, Auto, 4X4, Utility, & just a neat hunting & wheeling ride it's got to live.
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