E320 codes
 

I have seen several posts regarding retreiving of codes without the use of a scanner.

Is this possible on a '95 E320?

If so, could you tell me the procedure?

Thanks.

You have an LED display unit in your engine compartment, on the passenger side near the firewall. Press the button for 3 seconds (with the engine off and the ignition in the on position) and release. Count the number of flashes for the fault code. One blink indicates no codes present. Repeat the code retrieval by again depressing the button and count the blinks a second time. If you get the same number then there is only one code. If you get a different number of flashes, then you have more than one code. Keep repeating till all codes are read. This is indicated by the repeat of the first code received.

To clear the codes and reset the check engine light, after you've checked the codes, wait at least two seconds, then you hold the button down for six seconds. Each code must be erased individually (if you have more than one).

Here are the code numbers:

1 No faults.
2 Oxygen sensor inoperative.
3 Lambda control inoperative.
4 Air injection inoperative.
5 EGR inoperative.
6 Idle speed control inoperative.
7 Ignition system failure.
8 Coolant temp sensor-open or short circuit.
9 Intake air temp sensor-open or short circuit.
10 Voltage at Air Mass sensor too high or low.
11 TN (RPM) signal defective.
12 Oxygen sensor heater open or short circuit.
13 Cam position sensor signal from-EZL/AKR ign. control unit defective.
14 Intake manifold pressure at start too low.
15 Full throttle Info defective.
16 Idle speed info defective.
17 CAN Data exchange-Malfunction between control units.
18 Adjustable camshaft timing solenoid-open or short circuit.
19 Fuel injectors-open or short circuit or Emission control system adaptation at limit.
20 Speed signal missing.
21 Purge switchover valve-open or shorted.
22 cam position sensor signal defective.
23 Intake manifold pressure w/ engine running too low.
24 Starter ring gear segments defective.
25 Knock sensors.
26 Upshift delay switch over valve-open or shorted.
27 Coolant temp sensor deviation between sensor ciruits 1 & 2.
28 Coolant temp Sensor.

Post your results when you get them.

There are some very common fault codes with these engines with some pretty easy fixes.

Does the 95 S320 have the code led, also? I'm having trouble finding it.

I'm afraid I don't know about the W140 chasis. It could be already be OBDII equipped.

The C classes went to OBDII in 1994.

The W124 stayed with OBDI through 1995, and switched to OBDII with the new W210 chasis in 1996.

same codes 94' E-320??
 

??
TX,
DSR

Re: same codes 94' E-320??
 

Yes, 1993 300E (3.2's) and 1994-1995 E320's have the same chasis number, VIN #, and engine numbers. They share the same codes.

Thanks Paul
 

I've read about these codes on this site but never really understood what they were etc. Your information cleared that up.
Thank You.
DSR

Can't find it!
 

I have no doubt it's there but I cannot locate the LED readout.

On my car ('95 E320), the battery is located very close to a plastic firewall cover (passenger side) and there is nothing between the battery and the firewall cover.

I would assume the LED has some sort of lift-up cover but I see nothing near the passengar side firewall that would be a candidate.

It's right there next to the right corner of the battery.

It's on the right-side firewall that separates the battery from the engine.

It's a little black box with white numbers from 1 to 16.

On number two, there is a button. That is the button you press down and hold for 4 seconds.

To the right of this button is a a little round light. That is the LED that will flash.

My check engine light came on Sunday morning after about a 3 hour drive Saturday Night. I checked my codes and it flashed 4 & 9, so I reset it, and the check engine light has not come back on. I checked the connector to the air temp sensor, (I think) and it was loose, so I reconnected it. how does it determine that the air injection is not working?

I also had a code #4 pop up on my car, and it was a loose vacuum hose. I also had a code # 26, but it was a false code.

Apparently, any vacuum problem could trip a code #4 and maybe cause other codes to come up, kind of like chain reaction.

It takes several cycles for the same fault to cause the code to trip, so keep your fingers crossed.

Got it!
 

Paul S.,

Thank you very much. Your last post sent me right to it.

And I got a single flash!

Regards,

AH

If your check engine light wasn't on, then you should get only one flash.

The LED button is only hooked up to fault codes related to smog emissions. Nothing else.

'93-'95 W124's arent OBDII compliant, but they actually store all the codes that OBDII provides, but in a different way.

Arthur Dalton has posted on how to make a simple tool that allows you to get codes from all of the other sockets.

I got one, and checked codes, and found codes stored in socket 8 or 14. One code for a bad brake light switch, and one code for a fault related to the throttle actuator.

The code for the actuator was probably stored way back when I changed the throttle actuator, and I ended up having the brake light switch replaced this past Saturday.

I cleared the codes with the tool.

hey paul...

is there such a fault code box, etc. for my 92' 300CE?

that would rock if i could find out what's wrong with my car simply by pushing a button for 3 seconds...

thanks

I don't believe you have the box, but I could be wrong.

If you did, remember that the LED only stores fault codes for the emissions system, anyway.

I seem to remember reading somewhere that the 'built in' test button and LED were only provided in cars cold in California. Something to do with emissions?

Brake light code read from pin 14 would be the cruise control fault codes, nothing to do with engine management.

Sorry, I mixed up my notes.

I checked all the sockets, and got code #5 and code #11 from socket 14 (EA).

From my notes, code #5 on socket 14 is Brake light sw, and code #11 is CTP sw (Clossed throttle position).

hey paul
congrats on the wheel
what does it look like?

i want to get an s class wheel on my car...
woo hoo..

I posted a link to a picture of the steering wheel in a private e-mail to you.

Did you get it?

computer codes for 300e
 

Found a complete list of code on internet. Passing them on for others. It would be useful in having a master tech telling us what each means and what we could do tho fix them.


COMPUTER CODES for Mercedes Vehicles

This table may be used as a reference for interpreting your Mercedes vehicle's computer messages.

If codes other than these are indicated, repeat self-diagnosis. If codes reappear, substitute a known good ECM, and recheck codes. Codes flash the number of times for each malfunction. Example 28 times is code 28. # Flashes PROBABLE CAUSE for Mercedes vehicles 190E and 300 series (2.3L) 1990 thru 1993
1 No System Malfunctio
2 Throttle Valve Switch
3 Coolant Temperature Sensor
4 Airflow Sensor Position Indicator
5 Oxygen Sensor
6 Not Used
7 TD signal
8 Altitude Correction Capsule
9 Electro-Hydraulic Actuator (EHA)
10 Throttle valve Switch and /or Idle Speed Contact
11 Not Used
12 EGR Temperature Sensor
# Flashes PROBABLE CAUSE for Mercedes vehicles 300 series (2.8L and 3.2L) 1991 and later.
1 No fault in system
2 Oxygen sensor inoperative
3 Lambda Control inoperative
4 Air injection inoperative
5 Exhaust Gas Recirculation (EGR) inoperative
6 Idle Speed Control inoperative
7 Ignition System failure
8 Coolant Temperature Sensor - Open or short circuit
9 Intake Air Temperature Sensor - Open or shor circuit
10 Voltage at Air Mass Sensor too high or low
11 TN (RPM) signal defective
12 Oxygen Sensor heater open or short circuit
13 Camshaft Position Sensor signal from - EZL/AKR Ignition Control Unit defective
14 Intake manifold pressure at start too low
15 Fuel throttle information defective
16 Idle speed information defective
17 Controller Area Network (CAN) data exchange - malfunction between units
18 Adjustable Camshaft Timing Solenoid - open or short circuit
19 Fuel injectors - open or short circuit, or Emission Control System Adaptation at limit
20 Speed signal missing
21 Purge switchover valve - open or shot circuit
22 Camshaft Position Sensor signal defective
23 Intake Manifold Pressure with engine running too low
24 Starter ring gear segments defective
25 Knock Sensor defective
26 Upshift Delay Switchover Valve - open or short circuit
27 Coolant Temperature Sensor deviation between circuit No. 1 and sensor circuit No. 2
28 Coolant Temperature Sensor (Coolant Temperature Change Monitor)



# Flashes PROBABLE CAUSE for Mercedes 190E & 300 series (2.6L & 3.0L) 1991 thru 1993
1 No faults in system
2 Throttle Valve Switch (full throttle contact)
3 Coolant Temperature Sensor
4 Airflow Sensor Potentiometer
5 Oxygen Sensor
6 Not Assigned
7 TNA (engine RPM signal)
8 Altitude Pressure signal from EZL Ignition Control Unit
9 Current to Electro-hydraulic Actuator
10 Throttle Valve Switch (Idle Contact)
11 Air Injection system
12 Absolute Pressure valves from EZL Ignition Control Unit
13 Intake Air Temperature signal
14 Road Speed signal at CIS-E Control Unit
15 Not assigned
16 Exhaust Gas Recirculation (EGR)
17 Oxygen Sensor signal
18 Current to Idle Speed Air Valve
19 Not Assigned
20 Not Assigned
21 Not Assigned
22 Oxygen Sensor heating current
23 Short circuit to positive in Regeneration Switchover valve circuit
24 Not Assigned
25 Short circuit to positive in Start Valve circuit
26 Short circuit to positive in Shift Point Retard circuit
27 Data exchange fault between CIS-E Control Unit and EZL Ignition Control Unit
28 Loose contact in Coolant Temperature circuit
29 Difference in Coolant Temperatures between CIS-E Control Unit and EZL Ignition Control Unit
30 Not Assigned
31 Loose contact in Intake Air Temperature circuit
32 Not Assigned
33 Not Assigned
34 Faulty Coolant Temperature signal from EZL Ignition Control Unit


Disclaimer:
Use this as a guide, not a Bible. These codes are assumed current through 1997. No warranties or guarantees as to correctness or fitness for use is stated or may be implied.

1993 300E 3.2 FAULT CODES FOUND???
 

My wife was driving and the car started to act strange, oil press was bouncing etc. then the check engine light came on.
did a code search and have won the lotto:
2,4,6,9,10,14,16 wow. The car runs fine but the light is still on.
California car.
oil level is perfect. what does it mean to have all this codes appear at once,can I clear them faster by disconnecting the battery for a while??? thanks.

1993 300E code button on black box?
 

O.K. I just checked on my car and did find the box with the white numbers 1 to 16. But was is baffling is that I did not find or see a button or an LED ligh to the right of this button!! Actually the number 2 spot and several others, have no components in them Could I be missing something? Do I have another system? Please help....