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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #1 (Edited)
Hello fellows, my car won't start after parking overnight. Checked battery, it is good. 14.8V.
When I turned the key, engine does not crank. I do not hear the dadada clicking either. No sound. All dash lights are on. Lights do not dim when turning the key.
How do I check if it is starter or alternator problem? It was starting strong and quick yesterday.
No error code by simple code reader.

Thank you all. Any suggestion helps.
Regards,
Sean
 

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1994 S600 Coupe, 1995 S600 Coupe
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2,417 Posts
Check battery voltage on the battery terminal, not the battery post, when someone turns the key. That will tell you if the connection is good or bad, if it drops considerably.

If you can get to it while someone turns the key to start, rap on the side of the starter with the handle of a heavy screwdriver, lug wrench or something similar. If the solenoid is sticking, the rapping might temporarily free it and allow the car to start.

If those two things don't work, see if power is getting to the small terminal on the starter solenoid while someone turns the key. Measure between the terminal and ground. If you get power, the starter or the solenoid is bad. If you don't get power, something has gone bad either at or between the ignition switch and the wiring at the starter.

If the battery is good and charged, the alternator won't cause a starting issue.

Do the lights on the dash dim when the key is turned?

Jon
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #3
Jon:
Thanks for your prompt response.
The lights on the dash does not dim when the key is turned. Other suggestions, I will follow and get back to you asap.
Sean
 

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1994 S600 Coupe, 1995 S600 Coupe
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2,417 Posts
It could also be the transmission neutral safety switch. Try moving the selector to neutral instead of park and try to start it.
There is a starter lock out relay at the back of the fuse box. Listen at the back of the box when someone turns the key and see if you hear it click.

Wiring diagrams and part locators are here:

Jon
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #5 (Edited)
Jon:
1. check the terminal, turn the key and read the voltage, it drops from 12.2 to 11.8, batter looks good. fan turns a second, and hear the engine crank a second.
2. hear the starter relay click when turn the key. Relay should be ok. fan turns a second, and hear the engine crank a second.
3. Turn the gear to neutral. It does not start. fan does not turn, engine no crank sound.
4. going to get under the car to search for the starter and report back.......
No error code by simple code reader.
Thanks a lot.
Sean
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #6 (Edited)
Jon:
Update. There are two terminals on the solenoid.
1. Connect either of them with the multimeter, and the other end with ground, turn the key, read no value.
2. Connect one of it to the positive and the other to the negative, it reads 12 before turn the key. It reads low when turning the key, varies, like 6 volts, or 5 volts.
The starter is fine, right? I got underneath the car and listened to the sound when turning the key. The starter clicks and the engine cranks for less a second.

What could be the problem source then? The crankshaft sensor? But there is no error code by simple code reader.

Thanks again.
Sean
 

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1994 S600 Coupe, 1995 S600 Coupe
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Try turning the engine by hand with a socket and a breaker bar on the crank pulley. Turn it CLOCKWISE only. It almost sounds like either the starter drive is jammed or the engine is locked up mechanically.

Crank sensor has nothing to do with the starter not turning the engine over.

Jon
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #8
Thank you, Jon.

I saw the torque converter turned a second when turning the key. I will try to turn the crankshaft manually and report back.
How to tell the starter drive is bad? Take it off the car and charge it with a battery?
Thank you so much for your guidance through this troubleshooting process.

Regards,
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #9
Update:
Manually I can turn the engine. The engine turns for less than a circle then stops.
Any comments are welcome.
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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Discussion Starter #11
Jon,
It stops with starter. Manual turn no problem.
Sean
 

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1994 S600 Coupe, 1995 S600 Coupe
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My guess, bad starter. Check and clean both electrical connections on the starter, but disconnect the battery first. Most auto parts stores can test starters off the car for proper operation.

Jon
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #13
Thank you so much, Jon.
It look like very painful to take it off. The two connecting bolts are ok to do but the wiring connecting part on the solenoid, don't know how to access to it.
 

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Hello,

I have the same problem with my 1999 s320.
I changed the starter too.
I am suspecios to the small wire going to the solenoid. The wire is coming from silver box on top of the starter.
Does anyone knows, what's that box name or part number!?
 

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93 SL500, 95 SL320, 96 S320, 98 S500, 2002 E320 4Matic Wagon & A little 91 5.0 FORD Mustang
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8,226 Posts
Guys,
Check your fuses. I would jack up the car on ramps(I do not crawl under cars with jack stands). Get a volt meter and have someone crank the car. Measure the voltage signal at the starter solenoid wire terminal. On the 96 is a probability that starter harness wire can be bad. Up 97 build cars still had wiring issues. My 98 had wiring issues, and so did my 96, so their is a chance of that too here. Their is a big bare ground cable from the transmission to the chassis make sure it is tight, and the contacts are clean too.

722.6 cars(+97 S320's or +96 V8/V12 cars) do not have a neutral safety switch if the transmission shift linkage at the transmission is missing the shifter bushing, or at the shifter the bushing is missing. It may cause the transmission not index properly when it park or any other gear. The bushings just wear out. Typically, if the bushings are missing the cars start, they will not engage in gear.

Do check your fuses, and the ones with security. These cars have two sets of fuses-In the trunk and in the engine bay. I once blew the cigarette lighter fuse on a 95, and the car would not start, and on a 95 that fuse is tied to security.

On the cluster, make sure it does not say "No-Start" as that is key transponder issue...

Martin
 

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1994 S600 Coupe, 1995 S600 Coupe
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MAVA, it's not a crank, no start situation. It starts to crank, then stops. Something appears to be causing the starter to hang up, possibly a bad connection at the starter. Not a immobilizer situation. Engine turns over by hand.

Jon
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #17 (Edited)
Martin:
All fuses checked, front and rear, all fine.
Starter relay should be fine. Hearing the click when turning the key.
Voltage checked on the starter solenoid. Hearing the click when turning the key.
The lights on the cluster do not dim when turning the key, showing sign of good battery?
The cluster does not have error message or "No-start" message. No error codes by the simple code reader.
Replaced transmission valve body over a month ago. Car was starting fine. It occurred overnight.
Checked all connections, underneath the car, engine bay, for loose wires, hoses, connections, did not find anything.
Car is really clean, engine is clean, underneath is clean, no oil leakage.
The transmission area connection is fine. "Shifter connection bushing" is fine? I shifted it to neutral and drive, back and forth, the shifting was fine. I worked on my 1998 S320 before on the linkage bushing, but this 1997 S320 does not seem have shifter linkage problem.

Called road service, towing to car mechanic. Now seems the starter is the bad guy. The engine cranks: turns, fan rotates, torque converter turns, but it only turns slightly a bit, less than a quarter of a circle for sure, maybe about 15 degree.
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #18
Fellows, Jon,
Still need your help. Mechanic checked the starter, the ignition, the starter relay, all fine. He even replaced a new ignition switch,it still doesn’t work. He found that
1: the problem is somewhere between the relay and the starter wiring. He pulled the relay out and checked the current from the pin, it was ok , the current stays on.
2: If putting relay back and checking the current at the starter, the current will be on for a second only if turning the key quickly. If turning the key slowly, the current will not pass to the starter.
mechanic didn’t find code with his scanner.
Now, what’s the problem?
anyone has the wire diagram from the relay to starter?
Jon, I don’t know how to find the wiring diagram From the link you provided .
Thank you all.
 

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Registered
1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #19
Mechanic thinks the problem is no.85 on the relay and it is connected with ground. Can he try to connect no.85 with the car frame ground directly? He never done so , not sure.

still need the wiring diagram.
 

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1998 S320, 2000 S430, 1995 S600, 2002 S430 Designo, 2004 S430
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115 Posts
Discussion Starter #20
Does the Relay pin no.85 connect with pse control module? Why? Paw has something to do with the starter lockup? Pull the seat and located the pump. Find the cylinder area is hot. See the picture.
 

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