My 2007 Mercedes-Benz cls550 does not crank when engine is hot
06-25-2018, 04:10 PM
#1
Junior Member
Thread Starter
My 2007 Mercedes-Benz cls550 does not crank when engine is hot
2007 Mercedes-Benz CLS550 does not crank when engine is hot. In morning going to work and in evening coming from work, the car starts OK. I replace battery and the problem is the same.
I can test battery from the Starter relay. I can measure voltage at the input of the Starter relay.
What is a problem?
Johnny
(W219) engine
I can test battery from the Starter relay. I can measure voltage at the input of the Starter relay.
What is a problem?
Johnny
(W219) engine
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johnny425 (06-26-2018)
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johnny425 (06-26-2018)
06-25-2018, 06:14 PM
#4
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06-25-2018, 06:15 PM
#5
Junior Member
Thread Starter
06-26-2018, 12:10 AM
#6
Junior Member
Thread Starter
No issue at all while it is running. The engine runs smoothly and shows strong power
06-26-2018, 12:11 AM
#7
Junior Member
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I don't know yet about CPS. The engine runs smoothly and shows strong power.
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06-26-2018, 11:04 PM
#8
Senior Member
Check the starter relay (remove it from the car and open it up). I had a similar issue on an S class caused by a starter relay with a bunch of bad contacts.
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johnny425 (06-26-2018)
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johnny425 (06-26-2018)
06-27-2018, 12:38 AM
#10
Junior Member
Thread Starter
The starter is controlled by 3 relays:
1. Engine circuit relay
2. Starter relay
3. Circuit relay
The engine circuit and starter relays are controlled or turned on by 2 signals from the ME control module.
The circuit relay is controlled by the ignition key. These 3 relays reside in the Driver Side SAM control module.
I will check them on this weekend.
Johnny
1. Engine circuit relay
2. Starter relay
3. Circuit relay
The engine circuit and starter relays are controlled or turned on by 2 signals from the ME control module.
The circuit relay is controlled by the ignition key. These 3 relays reside in the Driver Side SAM control module.
I will check them on this weekend.
Johnny
06-27-2018, 04:32 PM
#11
Senior Member
The starter is controlled by 3 relays:
1. Engine circuit relay
2. Starter relay
3. Circuit relay
The engine circuit and starter relays are controlled or turned on by 2 signals from the ME control module.
The circuit relay is controlled by the ignition key. These 3 relays reside in the Driver Side SAM control module.
I will check them on this weekend.
Johnny
1. Engine circuit relay
2. Starter relay
3. Circuit relay
The engine circuit and starter relays are controlled or turned on by 2 signals from the ME control module.
The circuit relay is controlled by the ignition key. These 3 relays reside in the Driver Side SAM control module.
I will check them on this weekend.
Johnny
The following users liked this post:
johnny425 (06-27-2018)
06-27-2018, 06:24 PM
#12
Junior Member
Thread Starter
No crank and very quiet
06-27-2018, 07:18 PM
#13
MBWorld Fanatic!
There is a connector on the top of the engine that has the trigger wire for the starter solenoid. It's a 2.5mm purple/white wire. If you jump power to it, the starter will spin. This is how you quickly rule out a starter without chasing a bunch of relays or taking anything apart. I'll try to post up a pic of it but Star Wiring has been funny lately, I don't know if they got it fixed.
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johnny425 (06-27-2018)
06-30-2018, 12:37 AM
#14
Junior Member
Thread Starter
My car has a starter problem. The 12V on the starter solenoid used to start engine cranking (turn ignition key to Start) is shorted to ground when engine is hot.
I find out from the Starter relay. The Starter relay has input voltage of 12V (Pin 3) and 12V (Pin 1 and 2) to close connection but its output (Pin 5) is 0V. The output should be 12V. The output is connected to the starter solenoid. I measure resistance to be 0.2 Ohm between the output and ground when engine is hot.
I find out from the Starter relay. The Starter relay has input voltage of 12V (Pin 3) and 12V (Pin 1 and 2) to close connection but its output (Pin 5) is 0V. The output should be 12V. The output is connected to the starter solenoid. I measure resistance to be 0.2 Ohm between the output and ground when engine is hot.
