98 Amigo antilock

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Re: 98 Amigo antilock

Postby Buster28 » Wed Mar 20, 2013 6:49 am

If you decide to get a replacement CIM be aware there a 2WD and a 4WD version of the module. I am reasonably sure the 4WD version is 8973577000 (Isuzu/Honda part # 8-97357-700-0) and the 2WD version is 8-97357-701-0
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Re: 98 Amigo antilock

Postby alanb21 » Wed Mar 20, 2013 9:59 am

I was thinking of sending my EHCU out for repair. Either to the previously mentioned site or here https://www.myairbags.com/abs.php?gclid ... 4Aod71sAzQ.
The dealer gave me the 89735770000 as the latest version after I supplied him the VIN number.

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Re: 98 Amigo antilock

Postby Buster28 » Wed Mar 20, 2013 10:06 am

This appears to be a new one in an OEM box for $75 which is probably a better deal.
http://www.timberlinemgt.com/brakemodul ... 700-0.aspx
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Re: 98 Amigo antilock

Postby Gizmo42 » Wed Mar 20, 2013 10:23 am

There was a post recently on the Vehicross site about another vehicle that had the exact same ABS unit and much cheaper then from Isuzu. Dont know if the VX has the same unit as the rodeo though and the VX site is down at the moment (vehicross.info).
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Re: 98 Amigo antilock

Postby alanb21 » Wed Mar 20, 2013 2:35 pm

Buster28;
Thanks for the info. Ordered replacement from Timberline.
Also, thanks to Gizmo42 for your information.

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Re: 98 Amigo antilock

Postby alanb21 » Wed Apr 17, 2013 1:00 pm

Almost a month has gone by and I finally got a chance to install the replacement CIM. Lo and behold, the antilock warning light went out after the system performed its startup test.

Once again, thanx to Buster28 and Gizmo42 for your input.

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Re: 98 Amigo antilock

Postby bsmart10 » Wed Dec 18, 2013 2:11 pm

Hey guys, does this discussion also apply accurately to a 2001 Trooper? I've got a ABS light on the dash, has been for a couple of weeks now. I notice it is OFF sometimes and then ON again. Mostly ON. Just wondering where to look for the most likely problem, least expensive fix.
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Re: 98 Amigo antilock

Postby Buster28 » Wed Dec 18, 2013 2:54 pm

The first step would be to run the ABS flash code diagnostic. You can enable the ABS flash code diagnostic by grounding Pin 12 of the Data Link Connector (DLC) and turning the ignition switch to the On position. Pins 4 and 5 of the DLC are ground
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Re: 98 Amigo antilock

Postby bsmart10 » Fri Dec 20, 2013 11:49 am

Thanks Buster28. Is the Datalink connector you're referring to under the passenger seat? I need to ground the 4 pin while leaving everything connected as normal, intact. Correct? Will that cause a light to flash on the dash panel in a sequence? I have a ScanGuage tool if that is helpful? Is it?
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Re: 98 Amigo antilock

Postby Buster28 » Fri Dec 20, 2013 12:23 pm

Put a paper clip between Pin 12 and 4 or 5 and switch the ignition to On (Run), the ABS warning lamp should flash out a two digit failure code.
Most scan tools cannot read Trooper ABS failure codes.

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Re: 98 Amigo antilock

Postby bsmart10 » Sat Dec 21, 2013 10:44 am

Awesome...gotcha. That should be easy enough to do. Thank you. I'll report what the code flash sequence is.
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Re: 98 Amigo antilock

Postby bsmart10 » Fri Dec 27, 2013 7:35 pm

Finally got time to try the jumper out. I jumpered 4 and 12 and put the key to ON...... the ABS light stayed on solid, but the AIR BAG lite flashed once then twice ......12. Tried it twice with the same result. ABS light on solid, AIR BAG light flashed once then twice.
Then I jumpered 5 and 12, put key to ON, and ABS light flashed 12 and then 43. It waited a moment and repeated the same codes 12 and 43. So what does this code mean?
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Re: 98 Amigo antilock

Postby Buster28 » Sat Dec 28, 2013 8:56 am

#12 indicates the start of the sequence, DTC 43 means a problem with the Right Front Holding Solenoid valve was detected during the self check. This seems to be frequent failure, in some cases it is caused by a poor solder joint on the circuit board. The circuit board can be replaced or sent out for repair.
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Re: 98 Amigo antilock

Postby bsmart10 » Sun Dec 29, 2013 4:30 pm

Is the circuit board you refer to at the right front wheel or inside the vehicle somewhere? Thanks.
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Re: 98 Amigo antilock

Postby akamigo » Sun Dec 29, 2013 8:25 pm

Buster28 wrote:Put a paper clip between Pin 12 and 4 or 5 and switch the ignition to On (Run), the ABS warning lamp should flash out a two digit failure code. Most scan tools cannot read Trooper ABS failure codes. Click image to expand


Great info! Can you direct me to a downloadable manual like that for 92-97 troopers?
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Re: 98 Amigo antilock

Postby Buster28 » Mon Dec 30, 2013 8:29 am

The circuit board is attached to the ABS hydraulic unit, the electrical connector plugs into the circuit board. There are several solenoids on the board that operate hydraulic valves located inside the hydraulic unit.
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Re: 98 Amigo antilock

Postby bsmart10 » Sat Jan 25, 2014 8:23 pm

Buster, is the circuit board removable from the solenoid and pump assembly? This thing is tucked in behind the battery in a bad place to try to work on in place. I see they've changed the design since 1997 which my manuals are for. I went looking of the EBCM under the passenger seat and it wasn't there. Thanks for the pic in this thread showing the assembly.
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Re: 98 Amigo antilock

Postby Buster28 » Sat Jan 25, 2014 8:43 pm

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Re: 98 Amigo antilock

Postby bsmart10 » Thu Feb 13, 2014 12:29 am

I was able to get the large electrical plug off the front block by pulling the 'handle' on the right side of the black block toward the radiator about 2 inches, then pulling straight up on the connector itself. Cute retaining mechanism.

Ok, does anyone have a pic of the back side of the black block that is attached to the oil pump and oil porting assembly? There must be some electrical connections up inside the block? This is in a terrible location to get to, to remove the torx screws. I assume the black assembly has to come straight off the face of the porting block? I may have to remove the headlight to get to the screws in the block (looks like there are 6 of them). Is there any risk of damaging something when the black assembly is separated from the porting block? Any known shortcuts to getting the screws out? Thanks in advance.
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Re: 98 Amigo antilock

Postby Buster28 » Thu Feb 13, 2014 1:40 am

I don't have an image of a Trooper Coil Integrated Module (CIM), this image is from a 04 Dodge Ram. The round silver widgets are solenoids, the hydraulic valve stems protrude from the hydraulic unit case and fit loosely into the holes in the center of the solenoids. A Trooper CIM will have more solenoids because it is a 4 wheel ABS configuration. There in no mechanical or electrical connection between the CIM and the hydraulic unit so the CIM can be detached. Removing this from the Dodge took about 3 minutes.
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Re: 98 Amigo antilock

Postby bsmart10 » Wed Feb 19, 2014 1:23 am

Buster, great pic...thanks. Now I get the idea of what is inside there. Looks like to get the Trooper unit off, the headlight will have to come out first, but the grill will have to come off to get the headlight out. So, i'll be a bit longer job than the Dodge. Too bad, but when I get some good weather I'm gonna tackle it.
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Re: 98 Amigo antilock

Postby bsmart10 » Thu Mar 13, 2014 11:26 pm

Well, finally got some warmer weather and some time to take the front face of the Trooper apart to get at the Antilock brake control module. I'll post some pics to describe the process.
To start the front grill has to be removed. It's held by some pretty weak plastic clips at the top and 2 Phillips screws at the bottom, and plastic clip at bottom middle.
Next would be best to remove the Corner marker, turn signal light assembly. This didn't want to come out for me, so I had to loosen the headlight framework first. There are 2 front facing bolts that hold the headlight and 2 side bolts hidden behind the turn signal assembly. So you have to get the turn signal assembly out completely first, to get the headlight out. To remove turn-signal assm. remove the screw at the top edge that attaches to the headlight. Carefully pry the assembly toward the front of the vehicle. I had to get a pry bar to get it to move. It finally gave way, and I just layed it aside. Now I could remove the nuts holding the outer side of the headlight assembly and move it out of the way.
After the headlight is out you can move the wire bundles, splash rubber, and washer fluid filler hose out of the way to get to the screws holding the EBCM to the front of the hydraulic block. 6 screws to remove to pull it off, and its helpful to have a socket with a u-joint swivel to get to them. There was nothing obvious wrong with the electronics after I got a look at it under light and magnifier glass. Now I'm looking for a replacement unit.
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Re: 98 Amigo antilock

Postby bsmart10 » Fri Mar 14, 2014 9:21 pm

Today I decided to look 'inside' the EBCM to see if there was anything obviously wrong that I could fix myself. I saw a video on YouTube of a guy doing a repair on a Bosch 5.3 which made me want to look inside and see if mine had a similar problem. Here's the link.... http://www.youtube.com/watch?v=UqtowdSDbxU
So I broke into the unit...literally, and I have some pics of what I found. Oh, the 2001 Trooper uses a Bosch 5.4 unit, but what's a decimal point or two among friends.

The only thing possibly wrong that might could be fixed would be a bad solder joint on a coil, or maybe one of the larger CPU wires as seen in the video. Neither were a problem on my unit. FYI the Orange coils measure about 9 ohms, and the Blue coils are about 5ohms. Just to prove they are not open or shorted. Nothing to be fixed I guess. Gotta find a replacement now.

I wouldn't recommend trying to do this yourself. You have to destroy the housing to get the cap/covers off to begin with.
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Re: 98 Amigo antilock

Postby Buster28 » Sat Mar 15, 2014 5:19 am

This would be a $1000 job if you were paying someone to repair the ABS system. I saw some complete assemblies on eBay at a reasonable price.
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Re: 98 Amigo antilock

Postby bsmart10 » Tue Mar 18, 2014 8:50 pm

You're right, new units are anywhere between $500 - $1000. Too much for me.....just to put out the ABS light. I think I can use brakes just fine w/o ABS.

alanb21 had referenced this site..... I also found this http://modulemaster.com/en/abs/kh_325.php. Interesting site. So I sent them an email about fixing my EBCM. They first said they didn't do Trooper units. I emailed back saying they had my Bosch 5.4 listed on their website as one they could fix. They apologized and said they could fix the 5.4 if it was a broken wire internal as seen on the pics I posted. Mine doesn't have a broken wire, so I'm opting for a used unit off Ebay ($90) as Buster28 suggested. We'll see what happens.
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