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.