warning coolant visit workshop - p201f-002
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Joined: Mar 2016
Posts: 39
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E200 2002 kompressor
warning coolant visit workshop - p201f-002
I hope someone can help me how to troubleshoot:
facts:
1. my car recently got this error . it has m271 engine.
2. i have MBII diagnostic tool and it say i have DTC = P201F-002.
"m4/7 (engine and ac electric suction fan with integrated control). short circuit to ground open circuit wiring.
3. the error is intermittent, somethimes there is error sometimes none. error can appear even from cold start or even if engine already warmed up.
4. so far, i dont get this error after start(idle or driving).
5. if for example upon start, i got the error and continue driving, the fan will not turn on, it goes beyond 80 degees Celsius. buf if you turn off the engine and be lucky not to get the error, the fan will move!
6.fan relay in the engine bay already inspected and replace with new one
7. coolant temperature sensor is ok on my opinion because i see on dashboard that it is rising
8. cleaned connector of fan assembly, no carbon deposit or sign of meltdown.
* i tried unplugging the fan module , tried starting the car and so far i dont get the DTC, im still observing if it will be consistent without throwing error(at least for the purpose of isolaton)
what could be the problem? any recommendation on what to check?
facts:
1. my car recently got this error . it has m271 engine.
2. i have MBII diagnostic tool and it say i have DTC = P201F-002.
"m4/7 (engine and ac electric suction fan with integrated control). short circuit to ground open circuit wiring.
3. the error is intermittent, somethimes there is error sometimes none. error can appear even from cold start or even if engine already warmed up.
4. so far, i dont get this error after start(idle or driving).
5. if for example upon start, i got the error and continue driving, the fan will not turn on, it goes beyond 80 degees Celsius. buf if you turn off the engine and be lucky not to get the error, the fan will move!
6.fan relay in the engine bay already inspected and replace with new one
7. coolant temperature sensor is ok on my opinion because i see on dashboard that it is rising
8. cleaned connector of fan assembly, no carbon deposit or sign of meltdown.
* i tried unplugging the fan module , tried starting the car and so far i dont get the DTC, im still observing if it will be consistent without throwing error(at least for the purpose of isolaton)
what could be the problem? any recommendation on what to check?
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 39
Likes: 1
E200 2002 kompressor
9. 2/26 starting car couple of times with aircon off, the onces started , turn on aircon, so far i did not encounter error
10. i tried with aircon left at auto then turn off the engine , i got p20f1.
11. late this night , i got srs error, my MBII cannot detect airbag, front , rear , passenger sam etc. ECU on the other hand was ok , MBII can still communicate. I cleaned the connector of CGW, then replug. All SAM reachable again. so i clear all DTC. restatrt the car, fine no DTC. restart again the car (aircon l
10. i tried with aircon left at auto then turn off the engine , i got p20f1.
11. late this night , i got srs error, my MBII cannot detect airbag, front , rear , passenger sam etc. ECU on the other hand was ok , MBII can still communicate. I cleaned the connector of CGW, then replug. All SAM reachable again. so i clear all DTC. restatrt the car, fine no DTC. restart again the car (aircon l
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2004 Mercedes Benz E500
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 39
Likes: 1
E200 2002 kompressor
-- doing experimenet while waiting for the replacemnt fan.
9. 2/26 starting car couple of times with aircon off, the onces started , turn on aircon, so far i did not encounter error
10. i tried with aircon left at auto then turn off the engine , i got p20f1.
11. late this night , i got srs error, my MBII cannot detect airbag, front , rear , passenger sam etc. ECU on the other hand was ok , MBII can still communicate. I cleaned the connector of CGW, then replug. All SAM reachable again. so i clear all DTC. restatrt the car, fine no DTC. restart again the car (aircon left auto before turning off) , no P201F. I'll try again tommorrow if output is repeatable.
10. 2/27-2/28 - since i replugged the CGW, the result now more consistent. from cold start (aircon set to 0), p201f consistent. I tried clearing the code while enging running but it keep coming back. i did many restart till 80 degrees celcius;
11. i pulled out the fan plug while engine running, clear the code(sucessful) , reinsert the fan module, rescan again, no error......restart the car ,no error. why it becomes ok when i replugged the fan connector? ill do futher scenario tomorrow.
9. 2/26 starting car couple of times with aircon off, the onces started , turn on aircon, so far i did not encounter error
10. i tried with aircon left at auto then turn off the engine , i got p20f1.
11. late this night , i got srs error, my MBII cannot detect airbag, front , rear , passenger sam etc. ECU on the other hand was ok , MBII can still communicate. I cleaned the connector of CGW, then replug. All SAM reachable again. so i clear all DTC. restatrt the car, fine no DTC. restart again the car (aircon left auto before turning off) , no P201F. I'll try again tommorrow if output is repeatable.
10. 2/27-2/28 - since i replugged the CGW, the result now more consistent. from cold start (aircon set to 0), p201f consistent. I tried clearing the code while enging running but it keep coming back. i did many restart till 80 degrees celcius;
11. i pulled out the fan plug while engine running, clear the code(sucessful) , reinsert the fan module, rescan again, no error......restart the car ,no error. why it becomes ok when i replugged the fan connector? ill do futher scenario tomorrow.
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Thread Starter
Junior Member
Joined: Mar 2016
Posts: 39
Likes: 1
E200 2002 kompressor
i replugged the following coolant temp sensor , fan, so far replugging them does remove the error, however if I again restart the car after 2 or 3 hours, i have the error again. since i have MBII , i can see that p201f appears when im on key position 2, no need to start the engine. so i keep repeating steps from inserting key, put to position 2 , check scanner, then for some luck , no error appears then i can start the engine without any errors at all. if i restart the car let say after 10 -20 minutes , stilll no error.
i even though that it is related to battery, so to isolate concern on battery , i put the car on battery tender . yesterday, i get a consecutive success gradually increasing interval between restart 30mins, 1 hour, 3 hours , 4 hours then i got the error again! so this isolation was done without starting the car, touching, wiggline the wires and so on.
since im suspecting connector as well , i disconnect the ECU, then do restart interval again( i have done 8 hour interval). so far, no error, still observing
i even though that it is related to battery, so to isolate concern on battery , i put the car on battery tender . yesterday, i get a consecutive success gradually increasing interval between restart 30mins, 1 hour, 3 hours , 4 hours then i got the error again! so this isolation was done without starting the car, touching, wiggline the wires and so on.
since im suspecting connector as well , i disconnect the ECU, then do restart interval again( i have done 8 hour interval). so far, no error, still observing
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Thread Starter
Junior Member
Joined: Mar 2016
Posts: 39
Likes: 1
E200 2002 kompressor
still experiencing this error, ill try check the wire beneath the small battery . my old battery leaked plus drainage of water was blocked on that area, i managed to clean that area maybe 1 or 2 years ago, theres no harm opening the wiring harness , put a jumper wire to bypass the area that maybe damage , im suspecting the pwm signal wire at that area migh get corroded due to battery acid
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 39
Likes: 1
E200 2002 kompressor
my latest observation, cold starting the car , ill get the error. After 2 mins of running , stop the car then restart no more error. ill check the voltate on the pins using oscilloscope so i can see even see even slight fluctuation. battery voltage as detected in the bcm module is at 12.30 btw
Thread Starter
Junior Member
Joined: Mar 2016
Posts: 39
Likes: 1
E200 2002 kompressor
replacement part ( radiator fan assembly) arrived 3/20/2022. I installed it , and so far no error encountered till 3/31/2022. So i guess there is a component inside fan controller that behaves differently when supply is provide wherein its not in the beginning then once heated(?) start to work fine.
