LI14.20-N-071638

Engine power output is reduced and/or engine indicator
lamp lights up, various fault codes present in area of exhaust gas recirculation (EGR system) or in charge air system
Topic number
LI14.20-N-071638
Version
1
Function group
14.20 Exhaust gas recirculation
Date
08-21-2020
Validity
MODEL 906 with ENGINE 642
MODEL 907 with ENGINE 642
Reason for change
Model Validity Adapted
Reason for block
Complaint:
Engine power output is reduced and / or engine indicator lamp lights up, various fault codes present in area of exhaust gas recirculation (EGR system) or in charge air system.
Note:
The change in engine power putput is not known ot cause safety concerns; complaints have been no more serious
than a mild reduction in performance.
Attachments
File
Description
02.jpg
Bypass line of bypass flap
Cause:
The exhaust gas recirculation cooling solenoid valve (Y27/13) may stick in the valve seat and fails to admit the vacuum for the vacuum unit of the bypass flap.
This can cause sooting in the EGR or charge air tract.
Remedy:
Important:
•
Only replace components which do not function as designed due to sooting.
•
Cleaning the components is not permissible.
1.
Check vacuum unit for bypass flap at EGR cooler for leaks (see 01.jpg).
Note: To do this, a vacuum of 600 mbar must be built up at the EGR cooler bypass flap vacuum unit using the
vacuum pump (W 001 589 73 21 00).
Specified values:
- The vacuum must be held for a period of 5 s and may drop by no more than max. 5 mbar.
Measurement results:
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- If the results deviate from the specified values, the bypass flap vacuum unit must be replaced (see AR14.20D-7661SG).
- If the specified values are met/achieved, continue with the next step.
2.
Perform test of exhaust gas recirculation cooling solenoid valve (Y27/13) using diagnostic system.
Note: Use the diagnostic system for this.
Important: When the exhaust gas recirculation cooling solenoid valve (Y27/13) is actuated, the bypass flap vacuum unit and the linkage should move.
3.
If the linkage of the bypass flap vacuum unit does not move, replace the exhaust gas recirculation cooling solenoid valve (Y27/13).
4.
Connect diagnostic system and read out and erase fault memory (see AD00.00-D-2000-04SD).
5.
If the linkage of the bypass flap vacuum unit moves, check charge air system and exhaust gas recirculation system for leaks.
6.
If there are no leaks, please create a PTS case.
Note: The following information must be included with the PTS case:
Diagnostic data:
- Quick test
- Fault freeze frame data
- Development data diagnosis sheet (DAS) or performance data acquisition (Xentry Diagnostics)
- Test logs: Dynamic EGR test, hot film MAF sensor, intake port shutoff (if present)
Vehicle data:
- Repair history
- Vehicle operating conditions: km/day, freeway/urban/start-stop etc., customer's name
Attachments
File
Description
01.jpg
Exhaust gas recirculation system (EGR), charge air system
Symptoms
Power generation / Engine management / Indicator lamp / Engine diagnosis / lit
Power generation / Engine management / Engine performance / No/poor output
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC
Refer to EPC for required replacement parts.
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WIS-References
Document number
Title
Note
Allocation
AR14.20-D-7661SG
Remove/install exhaust gas
recirculation bypass flap
Remedy
AD00.00-D-2000-04SD
Connect STAR DIAGNOSIS, read out fault memory
Remedy
Validity
Vehicle
Engine
Transmission
Sprinter 907
642
*
Sprinter III
642
*
Attachments
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01.jpg:
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02.jpg:
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