P261A P261C

   #1  

Comtec

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Taking the car for MOT last week, flashing coil and limp mode.

Cancelled appointment and came home.

Code P261A (coolant pump B open)

Bought non OEM pump from GSF (£100) 059121012A and fitted this morning in the pouring rain

Cleared codes, and now P261C (coolant pump B short) but i can confirm pump is running, and continues running for a short period after engine is turned off.

Fault with old pump / new pump disconnected

Code:
Saturday,26,September,2020,11:15:54:22544
VCDS Version: Release 20.4.2 (x64) Running on Windows 10 x64
www.Ross-Tech.com

                Address 01: Engine       Labels: 03L-906-012-CKT.clb
Control Module Part Number: 03L 906 012 A    HW: 03L 906 012 A
  Component and/or Version: R4 2.0l TDI   H26 9977
           Software Coding: 0119401020440C080000
            Work Shop Code: WSC 131071 1023 2097151
              ASAM Dataset: EV_ECM20TDI01103L906012A 002016 ()
                       ROD: EV_ECM20TDI01103L906012A_002.rod
                      VCID: 221C1368544A701B647-8076
1 Fault Found:

4875 - Coolant Pump 2
          P261A 00 [167] - Open circuit
          MIL ON - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 18582 km
                    Date: 2047.15.31
                    Time: 31:63:63

                    Engine speed: 924.00 /min
                    Normed load value: 24.3 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 44 °C
                    Intake air temperature: 12 °C
                    Ambient air pressure: 990 mbar
                    Voltage terminal 30: 14.500 V
                    Unlearning counter according OBD: 40
                    Coolant temperature at radiator outlet: actual value: 14.5 °C
                    exh.gas recirc.: shut-off conditions-Bits 0-7: 0
                    exh.gas recirc.: shut-off conditions-Bits 0-7: 0
                    exh.gas recirc.: shut-off conditions-Bits 0-7: 0
                    exh.gas recirc.: shut-off conditions-Bits 0-7: 37
                    EGR cooling function: status-Bits 0-7: 0
                    exh.gas recirc. (EGR) cooler pump: specified value: 0.00 %
                    EGR Vacuum Regulator Solen.val.: activation: 60.28 %
                    Exh.gas temp.sen 1: 131.2 °C


Readiness: 0 0 0 0 1
Erased fault codes, installed new pump, the get this, 10 seconds after starting

Code:
Saturday,26,September,2020,11:01:59:22544
VCDS Version: Release 20.4.2 (x64) Running on Windows 10 x64
www.Ross-Tech.com

                Address 01: Engine       Labels: 03L-906-012-CKT.clb
Control Module Part Number: 03L 906 012 A    HW: 03L 906 012 A
  Component and/or Version: R4 2.0l TDI   H26 9977
           Software Coding: 0119401020440C080000
            Work Shop Code: WSC 131071 1023 2097151
              ASAM Dataset: EV_ECM20TDI01103L906012A 002016 ()
                       ROD: EV_ECM20TDI01103L906012A_002.rod
                      VCID: 221C1368544A701B647-8076
1 Fault Found:

4878 - Coolant Pump 2
          P261C 00 [167] - Short to GND
          MIL ON - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 18582 km
                    Date: 2047.15.31
                    Time: 31:63:63

                    Engine speed: 921.50 /min
                    Normed load value: 34.1 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 25 °C
                    Intake air temperature: 10 °C
                    Ambient air pressure: 990 mbar
                    Voltage terminal 30: 14.460 V
                    Unlearning counter according OBD: 40
                    Coolant temperature at radiator outlet: actual value: 11.6 °C
                    exh.gas recirc.: shut-off conditions-Bits 0-7: 0
                    exh.gas recirc.: shut-off conditions-Bits 0-7: 0
                    exh.gas recirc.: shut-off conditions-Bits 0-7: 0
                    exh.gas recirc.: shut-off conditions-Bits 0-7: 37
                    EGR cooling function: status-Bits 0-7: 0
                    exh.gas recirc. (EGR) cooler pump: specified value: 77.02 %
                    EGR Vacuum Regulator Solen.val.: activation: 66.21 %
                    Exh.gas temp.sen 1: 133.5 °C


Readiness: 0 0 0 0 1
Could the non OE pump be out of spec, giving fault ??

Cheers SHaun
 
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   #2  

Uwe

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Could the non OE pump be out of spec, giving fault ??
Possibly. Do you have wiring diagrams for this engine? Is this pump high-side switched or low-side switched?

-Uwe-
 
   #3  

Comtec

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It is pump V400, EGR cooler

How do i add image to post ?

SHaun
 
   #4  

Jack@European_Parts

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Did you consider to qualify the fault can be vacated with a decade box to verify ECU stack and wiring yet and check values of pump further measuring as per RTFB?
 
   #5  

Uwe

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How do i add image to post ?

-Uwe-
 
   #6  

Comtec

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Like i said earlier, the pump is working, possibly drawing excess current, would i be correct in assuming high sided switched, as one of the three connections is permanent ground.


Shaun
 
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   #7  

Uwe

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Interesting. It's not terribly obvious how that pump is switched. It clearly has a connection to ground, a connection to the ECU, and a connection to D108, which looks like some kind of switched positive? Any idea where it comes from?

-Uwe-
 
   #8  

MartinsX

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I had a case with MB Sprinter (very similar to Crafter) and couple cases with Opel Movano (copletely different car) throwing clearly "electrical" fault codes (open/short) for circulation pumps because of air in cooling system...
 
   #9  

Comtec

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I had a case with MB Sprinter (very similar to Crafter) and couple cases with Opel Movano (completely different car) throwing clearly "electrical" fault codes (open/short) for circulation pumps because of air in cooling system...
I did clamp hoses, and lost no more than a cup full of coolant during the changeover, will try and bleed system to see if fault clears..

Shaun
 
   #11  

Comtec

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The part is OEM equivalent

SHaun
 
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