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post #1 of 25 (permalink) Old 10-07-2005, 06:48 PM Thread Starter
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Code Reader

Hey Guys,

This is probably kind of duh, but what's the home brew code reader I keep hearing about? I don't have one and I'm thinking it could really come in handy. If I could read and clear codes on my own I'd be in alot better world of car repair than I am now.

-Tubs

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post #2 of 25 (permalink) Old 10-07-2005, 07:34 PM
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RE: Code Reader

Here's the schematic for the code reader:

http://members.aol.com/ajdalton7/ledtool.jpg

Use an empty plastic film canister to hold everything together. Black lead goes to Pin 1, white to Pin 16, center to either Pin 8 or Pin 14, depending where you want the codes from. Below are the codes and what they mean.

Emissions - Using Built-in Diagnostic Module
1 No Fault Found
2 Heated oxygen sensor faulty
3 Lambda control faulty
4 Air injection system faulty hot film mass air flow sensor with hot wire
5 Exhaust gas recirculation faulty
6 Idle speed control faulty
7 Ignition system faulty
8 Engine coolant temperature sensor open circuit
9 Intake air temperature sensor, open circuit
10 Voltage at mass air sensor too high/low
11 Tn-signal (rpm signal ) at engine control module faulty
12 Heated oxygen sensor heater circuit open or circuit short
15 Injector, cylinder 2
16 Closed throttle position information faulty
17 Data exchange malfunction between individual control module
18 Adjustable camshaft timing solenoid circuit open or circuit short
19 Injectors circuit open or circuit short emission control module adaptation in engine
control module at limit
20 Vehicle speed signal not present
21 Purge switchover valve circuit open or circuit short
22 Crankshaft position sensor signal faulty
23 Intake manifold pressure (in base module pressure sensor-) with engine running too
high/low.
24 Starter ring gear segments and /or crankshaft position sensor faulty
25 Knock sensors or engine control module faulty
26 Upshift delay faulty
27 Not used
28 Engine coolant temperature sensor (engine coolant temperature change monitor )
44 Not used
45 Fuel safety shut-off electronic accelerator or cruise control active
46 Resonance intake manifold switchover valve
47 Not used
48 Not used
49 Voltage supply at engine control module 8v
50 Engine control module
_________

PIN 8 ECU
1 No fault found
2 Engine Coolant temperature sensor
3 Intake air temperature sensor
4 Hot film mass air flow sensor
5 CTP switch
6 Not used
7 Not used
8 Idle speed control (ISC) system at upper or lower control stop or CC or EA indicates "limp
home" mode.
9 O2S 1 (before TWC) - voltage too high, circuit open or voltage implausible
10 O2S 2 (after TWC)voltage too high, circuit open or voltage implausible
11 O2S 1 heater (before TWC) - Current too high/low or short circuit.
12 O2S 2 heater (after TWC) - Current too high/low or short circuit.
13 O2S (Lambda) control system operating at rich or lean limit
14 Injector, cylinder 1
15 Injector, cylinder 2
16 Injector, cylinder 3
17 Injector, cylinder 4
18 Injector, cylinder 5
19 Injector, cylinder 6
20 Self-adaptation at idle speed or upper/lower partial load at rich or lean limit
21 Ignition output 3 or ignition coil for cylinder 1 and 6
22 Ignition output 1 or ignition coil for cylinder 2 and 5 (Engine 111, cylinder 1 and 4)
23 Ignition output 2 or ignition coil for cylinder 3 and 4 (Engine 111, cylinder 2 and 3)
24 CKP sensor or magnet for position sensor not recognized
25 CMP sensor not recognized or implausible
26 Not used
27 TN-signal (rpm signal ) - open or short to ground
28 VSS - open circuit
29 Not used
30 Fuel pump relay module - open or short circuit
31 Not used
32 Knock sensors 1 and /or 2
33 Maximum retard setting on at least one cylinder has been reached or the ignition angle
deviation between the individual cylinders is greater than 6 degrees crankshaft angle
34 Knock control-output switch in engine control module faulty Momentary fault in
self-adaptation closed throttle speed/partial load
35 Model 124,129 and 140 AIR pump switchover valve and/or electromagnetic AIR pump
clutch. Model 202 AIR pump switchover valve and/or AIR relay module
36 Purge control valve - open/short to ground or B+
37 Upshift delay switchover valve
38 Adjustable camshaft timing solenoid - open/short to ground or B+
39 Exhaust gas recirculation switchover valve - open/short to ground or B+
40 Transmission overload protection switch - open/short to ground or B+ or open or closed or
implausible
41 CAN communication from engine control module faulty
42 CAN communication from ASR, EA/CC/ISC module or diagnostic module (OBD II) faulty
43 Starter signal (circuit 50) not present
44 Not used
45 Fuel safety shut-off of electronic accelerator or cruise control active
46 Resonance intake manifold switchover valve - open/short to ground or B+
48 O2S 2 (after TWC) heating circuit relay module - open/short to ground or B+
49 Voltage supply at engine control module implausible/low volts
50 Engine control module faulty or not coded.
____________

PIN 14 CC/ETA
1 No fault found
2 EA/CC/ISC control module (N4/1) or Safety contact switch (M16/1s1) or Stop lamp
switch or Cruise control switch or Actual value potentiometer or Starter lock-out/back-up
lamp switch or engine speed signal or vehicle speed signal or closed throttle position
switch or safety relay in EA/CC/ISC control module
3 Right EA/CC/ISC actuator (left cylinder bank) (M16/1)
4 Cruise control switch (S40)
5 Stop lamp switch (S9/1)
6 Starter lock-out/backup lamp switch
7 CAN data bus signal from EA/CC/ISC, ABS/ASR, HFM-SFI or LH-SFI (right or left)
control module faulty.
8 Left front axle vehicle speed sensor from ABS/ASR control module
9 Left rear axle vehicle speed sensor from ABS/ASR control module or in 124 chassis
Hall-effect speed sensor.
10 Engine speed signal (TN) from base module (LH-SFI) or engine control module (HFMSFI)
11 Closed throttle recognition signal to engine control module (HFM-SFI or Left LH-SFI)
Fuel safety shut-off to engine control module (HFM-SFI or left or right LH-SFI)
12 EA/CC/ISC control module voltage supply
13 Left EA/CC/ISC actuator (right cylinder bank) or actual value potentiometer (M16/4r1 or
M16/4r2) or actuator motor (M16/4m1)or magnetic clutch (M16/4k1).
14 Closed throttle position contact switch
15 CAN data exchange with ABS/ASR control module illogical
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post #3 of 25 (permalink) Old 01-10-2007, 04:55 PM
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Cool Really fine but where is 8-pin?

Thank you, but, where is 8-pin schematics & fault code? Mine is a 300E/91 no-cal, and i haven't neither the 16-pin box, green flashing light and push-button.

TIA,

karfax
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post #4 of 25 (permalink) Old 01-10-2007, 10:15 PM
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Quote:
Originally Posted by karfax
Thank you, but, where is 8-pin schematics & fault code? Mine is a 300E/91 no-cal, and i haven't neither the 16-pin box, green flashing light and push-button.

TIA,

karfax
no pin box? dealer needs to check then? or indy mech?


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post #5 of 25 (permalink) Old 01-11-2007, 06:04 AM
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The 91 300E is different. I'm not sure exactly how. The diagnostic module may be round with 38 pins?... I'm not sure. Hopefully somebody with a 91 can help here.
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post #6 of 25 (permalink) Old 02-17-2007, 04:50 PM
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So to get ECU codes, you plug the wire into pin 8, and to get the CC/ETA codes you plug into pin 14, but how do you get the emissions codes by using the built in diagnostic module? Also, will this tool work on a 1990 300CE?
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post #7 of 25 (permalink) Old 07-26-2007, 08:01 PM
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How about getting 4Matic codes? The light is always on and I did move the knob to "test" mode, RWD.
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post #8 of 25 (permalink) Old 07-27-2007, 05:45 AM
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I don't know what the answer is, or if it's in the link below. But this link has a lot of comprehensive code reading information for the 88-98 Benzes.

http://www.geocities.com/MotorCity/D.../cs1000_mb.pdf
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post #9 of 25 (permalink) Old 07-27-2007, 06:21 AM
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How do you read the codes given you have only 1 LED? Do I press the push-button switch and then count the LED flashes that follow? What if a car has multiple codes?

Also, does anyone know if one of these home-made testers will work with an '88 Non-California 300E?

'98 E320 Wagon (Brillantsilber) - 114,000 miles
'82 300 TD Turbo (Englischrot) - 185,000 miles
'82 300D Turbo (Hellelfinbein) - 350,000 miles
'88 300E (White) - 140,000 miles (Sold)
'79 300TD (Sky Blue) - 279,00 miles (Sold)
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post #10 of 25 (permalink) Old 07-27-2007, 04:26 PM
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This thread should answer a lot of questions.

E320 16 PIN DTC Charts inc. pin 8, pin 14 - ShopForum
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