Tester Bosch

[Fortun Bawa]

Thiscompact, ergonomically designed coil cord circuit tester helps to quickly locate hot circuits. The cord is constructed from high quality, high visibility polyurethane for superior memory retention and resistance to oil and grease and is ideal for benchtop work and in small areas.

Offering a wide-range of testing norms, such as EN, EN2, DIN, SAE, IEC, JIS and MCA, the versatile BAT 115 battery tester tests 6 V and 12 V batteries from 40 - 2000 CCA, including lead-acid, EFB, Gel and AGM (flat and spiral) using a micro-load test for proven accurate results while also offering the ability to test 12 V and 24 V charging systems with a diode/ripple test.

I've been looking for an L-Jetronic tester ever since I discovered Paul Anders'sexcellent webpage documenting all the various testers he's located and collected. There's also Jeff Bowlsby, who built a neat breakout box to test his wiring harnesses. Wow! I really respect the thoroughness of the 914 community: Pelican Parts used to rent out a D-Jetronic tester to it's customers.

Bus folk are lucky to be able to benefit from their documentation but unfortunately the 914 community eschews L-Jetronic, understandably in favor of D-Jetronic because it was far less common and on the surface it seems to have robbed the engine of precious horsepower. Little information exists about the testers that were compatible with the Bosch AFC fuel injection used in 75-79 VW busses.

I really just wanted one more as a curiosity because the basics of the L-Jetronic system can easily be tested with a VOM and FI fuel pressure gauge but if it was practical enough to build, mechanics at the VW dealer must have had a good use for them. I bet they were the only ones who could afford them.

I recently came across a Bosch L-Jetronic tester. At the time the owner could only describe it as possibly a tester for german ECUs but I recognized the wiring harness connector and did some research into the Motronic connector to see if I wasn't bidding on the wrong tester. Fortunately he gave me the part number and I contacted Bosch and eventually located someone familiar with the unit.

That company is absolutely fabulous: notonly did they tell me that they stopped producing that tester in 1989 but they mailed me an operating manual and some sales literature. I was pretty hyped that it was a vintage Bosch ECU tester and eagerly awaited the documentation to verify it was intended to test L-Jetronic and got lucky.

I purchased the tester for $44. Since publishing this information the prices have skyrocketed because buyers and sellers know what this item looks like now. Don't pay more than $100 more this unit. They come up for sale all the time on eBay and have limited usefulness simply because the L-Jet system is so easy to diagnose and the ECU is so robust.

This documentation is for PERSONAL VIEWING ONLY. I have expended a great deal of time and expense researching and collecting it. YOU DO NOT HAVE PERMISSION TO DOWNLOAD THESE IMAGES TO OFFER AS DOCUMENTATION WITH YOUR AUCTION AND/OR SALE OF AN L-JET TESTER TO INCREASE ITS VALUE OR AUCTION AND/OR SELL THESE IMAGES IN PRINTED FORM SEPARATELY. BY READING THIS YOUR ARE AGREEING TO THESE TERMS AND YOUR AUCTION/SALE WILL BE SUBJECT TO A COMMISSION OF 50% FINAL SELLING PRICE IF YOU DISHONOR THIS AGREEMENT.

It seems there are several versions of the Bosch Manual. A friend in Germany had a manual with WA-UBF 910/1 DBFSp (7.78) 1.5 CD printed on the back and it contained several extra pages with operating values in German, English, French and Spanish. Here's the English version which is much more complete than the sales literature.

An Alfa Romeo mechanic sent me a portion of a test manual that covers testing an L-Jet Alfa using our Bosch tester. Very useful. We are left to wonder, did Bosch ever published their own manual? Probably...

Recently I was contacted by man who wanted a photocopy of my manual. He was selling the same tester on eBay and wanted to provide a copy of the manual to the winning bidder. I gladly duplicated it and sent it along to him and for a lark wondering if he'd seen the supplementary cable that tests the fuel injector firing frequency. Bosch told me that the supplementary cable was still available but since it was $442.70 and my tester cost 1/10th of that I passed. As luck would have it, he forgot to list the cable with the auction and sold it to me. No good deed goes unpaid!

If you have a tester and want to build a cable you'll need to butcher an L-Jetronic wiring harness for the parts. You can locate the battery clamps easily I bet. The male FI connector was hard to find until I finally located Eagle Day as a vendor so it's now possible to build a cable. It's a little more complicated that it seems and I'm not 100% sure about the components on the circuit board. I've yet to identify the exact diodes used and the black object. Any help would be appreciated.

Kent's Factory Service Manuals collection is going on sale now. CLICK HERE. Tech HelpProductsSupportManualsNews Bosch Mechanical Fuel Injector (MFI) Tester and Cleaning Kit Store > Fuel Delivery Products > MercedesSource Kits NEW VERSION 3 release. See related products below for application notes. AVAILABLE NOW! For most Mechanical Fuel Injected Mercedes Gas Engines 1959 to 1972. Would you like to find out how well your old (1959 to 1972) mechanical gasoline/gas fuel injectors are working? They could be spraying so much fuel that the result could be major damage to your engine! Now you can do it yourself at home with our custom bench mount hand pump pressure tester and cleaning kit.

PLEASE NOTE: This tester will also work with older Porsche and other European cars that used the Bosch mechanical fuel injection system from the 1960's. This kit will work on the fuel injectors from the 6.3 V8 but it WILL NOT WORK on the 3.5 and 4.5 V8 engines (those used electronic fuel injectors).

Works on all models from 1977 to 1993 with the Bosch C.I.S Fuel Injection system - see models listed below: Now you can do it yourself on the bench with this inexpensive tester- Save big $$. Ever wonder how well your old CIS fuel injectors are working?

A surprising number of different testers were developed for the D-Jetronic system. I've made a hobby of collecting these testers and learning about what they can do. Note - I'm not in the business of renting them out. Pelican Parts has an excellent rental service with two of the most capable testers, the Bosch and VW testers.

This was the first tester model that Bosch provided for D-Jetronic. Most of the tests it supports can be accomplished with a break-out box and a DMM. The meter measures ohms or volts, depending on the positions of switches A and B. A 25-pin interposer is used to connect the tester with the ECU and the wiring harness.

This tester is a re-labeled Bosch tester designed for the Jaguar XJ-S, which used D-Jetronic. It differs from the Bosch testers by having a separate plug that apparently connects to the FI amplifier, which was used to drive the additional injectors on the 12-cyl Jaguars. Other than that, it is functionally equivalent to a Bosch EFAW 228 tester, refer to the test steps above for details. I have finally acquired a manual for this tester off of Ebay and I'll post any useful info I find. I sold this tester in early 2002.

The VW 1218 is a highly capable tester designed by Grundig for VW. Output from the tester is of a "go/no-go/caution" nature, with green, red, and yellow lights signifying if a test has been passed or failed. The advantage of the VW 1218 tester over the Bosch testers is that it does block-by-block testing of the major functional sections of the ECU, and it also does a self-heating test to evaluate the TS1 and TS2 sensors over their operating range. This tester is the best way to evaluate an ECU, it can detect even the most obscure ECU problems. It can be rented from Pelican Parts.

This tester is the hydrogen bomb of D-Jetronic testers. It was sold by EFI Associates in Southern California in the late '70's. EFI is now out of business, but it was run by Luis Eros (deceased) who others acknowledge as the ultimate D-Jet guru in the US. They also produced a tester for the L-Jetronic system called the AFC Analyzer. Anybody out there who has more information on the history of EFI Associates, or has a line on either used MPC or AFC Analyzers, please contact me at pban...@yahoo.com .

It does all of the static tests and ECU tests of the other testers, plus it can measure injector pulse width directly. Using documentation that comes with the tester, you can verify under operating conditions if your FI system is delivering the same pulse widths as the factory settings. It also allows you to adjust mixture while running, and use the pulse widths noted to re-adjust the pressure sensor to duplicate. Retail price for the tester around 1977 was about $2000.

Unfortunately, my tester has a problem with the circuit that creates the trigger contact pulses needed to simulate engine speed conditions when performing the "engine off" tests. I hope to fix it when I get the time to trace the circuit. It works in position 1 with the motor running, providing pulse width duration (resolution of 0.01 ms), mixture control, and the other test functions listed below. I acquired a second MPC Analyzer in mid-2002, which has the EXACT same problem - which leads me to believe the problem is with me! I will be investigating further in late 2002 to see if I can figure out what is going on.

This is an early model of EFI Associates D-Jetronic tester, it preceded the Model 9100 described above. With the exception of the mixture adjustment capability of the 9100, and the more extensive documentation and test procedures of the 9100, this tester can manually accomplish nearly everything the 9100 does. My unit is functional and I've tested it on my car - it measures the injector pulse width under nearly any operating condition. The tester can simulate the TPS, trigger contact points, and both temperature sensors, using the three knobs on the lower right. By using a vacuum pump to set the MPS, any load and engine speed condition can be simulated. As I describe below, it should be possible to duplicate the functions of this tester by using a split breakout box, with a trigger contact simulator and a pulse width meter (note - which is pretty much how the Far West tester below works).

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