02 WJ Overland p0136 p1499 - JeepForum.com
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post #1 of 25 Old 07-16-2020, 09:00 PM Thread Starter
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02 WJ Overland p0136 p1499

Hi all I will try to make this as short as possible. Really needing some outside insight right now.
I started off with an 04 WJ Overland had 244,000ish miles on blew a head gasket and blew up an exhaust valve. So I bought a rebuilt create engine, had my trans and transfer case rebuilt. Put it all together, drove it for a little while and some kid pulls out in front of me. After a long battle with insurance my 04 gets totaled.

So I bought an 02 Overland that needed and engine, pulled out all its drive train and swapped in the "new" stuff from the 04. I have everything back together now, started it up and the CEL light comes on and I got codes p0136 and p1499. Did a little but of reading and saw that the hydraulic fan solenoid probably needed a replacement, and bank 1 sensor 2 O2 sensor. Well the solenoid did not have the T-40 torx on it to remove it from the fan assembly. So I just replaced the whole fan assembly from the other jeep. Then I put in a new 02 sensor (bank 1 sensor 2). Started it back up and still getting the same codes. I did clear the codes before installing the new parts, and cleared them after and tried restarting again, but the CEL light comes back on and still getting the same codes.

I did check the O2 sensor fuse (#16 in the under hood fuse block) and it was blown I replaced it and still getting the CEL, code, and rough idle. As for the p1499 code I am stumped after replacing the while fan assembly, never had that code in the 04.

Any help would be awesome I need to get my jeep back on the road, and off road.

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post #2 of 25 Old 07-16-2020, 10:37 PM
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KOEO is there 12v at fan module terminal 1 OR/DG wire ?


P0136-1/2 O2 SENSOR HEATER CIRCUIT MALFUNCTION
P1499 - HYDRAULIC FAN SOLENOID CIRCUIT

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 25 Old 07-17-2020, 09:12 AM Thread Starter
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I will check today. Thanks
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post #4 of 25 Old 07-17-2020, 02:55 PM Thread Starter
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KOEO and not getting any voltage
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post #5 of 25 Old 07-17-2020, 03:45 PM
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check fuse #16 in PDC - do not look at it confirm it has 12v both sides with KOEO.

That fuse is common circuit for both codes.
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File Type: pdf 02wj fan module.pdf (161.0 KB, 2 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 25 Old 07-17-2020, 04:43 PM Thread Starter
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No voltage there either. I replaced it earlier and it blows when KOEO
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post #7 of 25 Old 07-18-2020, 10:39 AM Thread Starter
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So I watched a youtube video basically saying to unplug all the O2 sensors start the engine then plug them in 1 by 1 until fuse #16 blows to determine which O2 sensor is bad. Since I am getting both the 1499 and the 136 code, and I already replaced both downstream O2 sensors (w/ Denso sensors), I feel like it must be something else that must be causing the fuse to blow.

Do I need to just chase down all the wires for that circuit and make sure there is no damage or short somewhere?
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post #8 of 25 Old 07-18-2020, 10:51 AM
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time permitting I will get the wiring diagrams.

Why did you replace the sensors?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 25 Old 07-19-2020, 12:22 PM Thread Starter
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When I first started it up and got the code I just figured the bank 1 sensor needed to be replaced. So I got one, replaced it and stared it up. Well I forgot to tuck the wires and connectors away, and I think the first sensor I got was an upstream one, because after idling for a few minutes there was more smoke than expected coming off the engine so I looked underneath at the exhaust and the bank 1 cat was red hot and the connector for the bank 2 sensor was on the exhaust and was completely melted. So I scavenged a connector from my 04 and got 2 new sensors.
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post #10 of 25 Old 07-19-2020, 10:54 PM
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this is a 2002 WJ With a 4.7L?

lost train of thought
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File Type: pdf WJ PDC.pdf (117.7 KB, 3 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #11 of 25 Old 07-20-2020, 12:06 AM Thread Starter
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Yes it is.
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post #12 of 25 Old 07-20-2020, 05:08 PM Thread Starter
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I am not getting voltage at either side of fuse #16 KOEO.

Also thanks for the wiring diagrams.
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post #13 of 25 Old 07-29-2020, 12:30 AM Thread Starter
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So finally got back in the shop and did some testing. It looks like I have a short to ground on that OR/DG wire. Used my multi-meter to check continuity and it was showing around 63 ohms, if I remember correctly. I just visually looked at the wire bundle that, the wire goes into and it looks like it has never been messed with, looks like it just runs under the battery tray then along the fender to the PCM. I picked up a meter/tool from a buddy that should help me track down the short, I hope. This is definitely one of my automotive skills that is lacking in knowledge and confidence.
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post #14 of 25 Old 07-30-2020, 04:31 PM Thread Starter
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Well I uncovered the wire from the fuse all the way back to the plug for the fan. And I do not see anything wrong with the wire at all no rubbed out spots, no bare spots, no cracks. Should I just cut and put in a new piece of wire? Anything else I can test?
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post #15 of 25 Old 08-04-2020, 08:02 PM Thread Starter
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So it wasn't the wire going to the hydraulic fan plug. There is another wire coming off of fuse #16, checked that one and the short is on that wire.

This OR/DG wire goes to the O2 sensor downstream relay, off that same terminal there is another OR/DG wire that goes back to the PCM plug. I cut the wire in between the plug and the O2 sensor downstream relay. The short was some where between there and the plug. I cut the wire again, right before the plug. There is not short between there and the plug, and still a short on the remaining peice of wire. My plan is to just run a new section on wire from the plug section to the good section before the O2 sensor downstream relay.

Kind of ran out of time tonight so that's where I'm at right now. Will be back at my shop tomorrow. Does this sound like a good or proper plan of action? Or should I dig further into the harness in case other wires are effected also. Like I said earlier wiring is not my strong suit.
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