W DOC AIRBUS | TSM A320F

Idle Speed Difference between Engine 1 and Engine 2

TASK 73-00-00-810-872-A
Idle Speed Difference between Engine 1 and Engine 2

1. Possible Causes
  • IDG, FRV (Oil temp)
  • SLAT/FLAP CONTR.COMP. [21CV]
  • SLAT/FLAP CONTR.COMP. [22CV]
  • EIU-1 [1KS1]
  • EIU-2 [1KS2]
  • SENSOR-TEMP, LEFT WING TK OUTER CHANNEL A [30QJ1]
  • SENSOR-TEMP, RIGHT WING TK OUTER CHANNEL A [30QJ2]
  • SENSOR-TEMP, LEFT WING TK INNER CHANNEL A [29QJ1]
  • SENSOR-TEMP, RIGHT WING TK INNER CHANNEL A [29QJ2]
  • SENSOR-LOW LEVEL, LEFT WING TK INNER CHANNEL A [38QJ1]
  • SENSOR-LOW LEVEL, RIGHT WING TK INNER CHANNEL A [38QJ2]
  • SENSOR-HIGH LVL, LEFT WING SURGE TK CHANNEL A [28QJ1]
  • SENSOR-HIGH LVL, RIGHT WING SURGE TK CHANNEL A [28QJ2]
  • FLSCU-1 [7QJ]
  • FLSCU-2 [9QJ]
  • P/BSW-ANTI ICE/ENG 1 [2DN1]
  • P/BSW-ANTI ICE/ENG 2 [2DN2]
  • P/BSW-ANTI ICE/WING [3DL]
  • wing anti-ice valve L
  • wing anti-ice valve R
  • PO/P12/T12
  • BMC-1 [1HA1]
  • BMC-2 [1HA2]
  • ECU [4000KS]
  • LGCIU-1 [5GA1]
  • LGCIU-2 [5GA2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 28-46-00-810-812-A
L(R) Surge Tank Overflow Sensor 28QJ1(2)
TSM TASK 28-46-00-810-813-A
L(R) Inner Temperature Sensor 29QJ1(2)
TSM TASK 28-46-00-810-814-A
L(R) Outer Temperature Sensor 30QJ1(2)
TSM TASK 28-46-00-810-815-A
L(R) IDG Shut Off Sensor 38QJ1(2)
TSM TASK 28-46-00-810-818-A
FLSCU1(2) 7QJ(9QJ)
ASM 275110
AMM 27-51-34-000-001
Removal of the SFCC
AMM 27-51-34-400-001
Installation of the SFCC
AWM 302101
ASM 302102
AWM 302102
AMM 30-21-51-000-040
Removal of the Engine Air-Intake Anti-Ice Valve
AMM 30-21-51-400-041
Installation of the Engine Air-Intake Anti-Ice Valve
AMM 32-31-71-000-001
Removal of the LGCIU
AMM 32-31-71-400-001
Installation of the LGCIU
AMM 36-11-34-000-001
Removal of the BMC
AMM 36-11-34-400-001
Installation of the BMC
AMM 71-00-00-710-006
Minimum Idle Check
AMM 73-21-60-000-001
Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001
Installation of the Electronic Control Unit (ECU)
ASM 732508
3. Fault Confirmation
Subtask 73-00-00-710-190-A ** ON A/C NOT FOR ALL
A. Test
   (1) Not applicable.
4. Fault Isolation
Subtask 73-00-00-810-122-A ** ON A/C NOT FOR ALL
A. If the failure occurred :
   (1) Only in flight and idle speed was correct during ground operation:
  • Do a check of the PFR and of the SMR for failure messages IDG, FRV (Oil temp).
     (a) If there is a failure message:
  • Do the applicable trouble shooting procedure (TSM CFDS chapter 79).
     (b) If there is no message:
     (c) If the fault continues:
  • Check the electrical wiring between the SFCC1(2) and the EIU-1 [1KS1] ( EIU-2 [1KS2] ) ASM 275110.
  • Repair as required.
   (2) Either during flight or ground operation:
  • Do a check of the PFR and the SMR for ECAM status EIU and/or for failure.
     (a) If the failure message IDG, FRV (Oil temp) is displayed :
  • Do the applicable trouble shooting procedure (TSM CFDS chapter 79)
     (b) If one of those failure messages EIU (031), J3 or ZC, EIU(ECSD), J3 or ZC, EIU(030), J3 or NO EIU 1(2) DATA is displayed :
  • Do the applicable trouble shooting procedure (TSM CFDS chapter 73 and 21).
     (c) If one of the following failure messages relative to fuel system elements is displayed:
       1 FUEL LEVEL SENSING L OUT TEMP SENSOR 30QJ1 or FUEL LEVEL SENSING R OUT TEMP SENSOR 30QJ2
       2 FUEL LEVEL SENSING L INN TEMP SENSOR 29QJ1 or FUEL LEVEL SENSING R INN TEMP SENSOR 29QJ2
       3 FUEL LEVEL SENSING L LO LEVEL SENSOR 38QJ1 or FUEL LEVEL SENSING R LO LEVEL SENSOR 38QJ2
       4 FUEL LEVEL SENSING L SURGE SENSOR 28QJ1 or FUEL LEVEL SENSING R SURGE SENSOR 28QJ2
       5 FUEL LEVEL SENSING FLSCU1 7QJ or FUEL LEVEL SENSING FLSCU2 9QJ
     (d) If none of those messages is present:
  • Do a check of the nacelle anti-ice pushbutton switch (2DN1(2DN2)) on the engine which has the highest idle speed as follows:
       1 Check that with pushbutton switch selected OFF, ground is present at pin AA/B2 ASM 732508.
         a If there is no ground:
         b If ground is present:
  • Check that there is no ground at wire connected to pin AA/C2 of the pushbutton switch ASM 302102.
         c If ground is present:
  • Replace associated nacelle anti-ice valve 4000DN AMM 30-21-51-000-040 and AMM 30-21-51-400-041 or repair wiring.
  • Do a check of the wing anti-ice pushbutton switch (3DL) as follows:
    If there is no ground:
    * replace the P/BSW-ANTI ICE/WING [3DL] .
     (e) If nothing is found:
  • Look for warning failure message including the following words TEMP CTL WAI or WING A.ICE in the PFR.
       1 If message or warning is present:
  • Do the trouble shooting procedure of relevant wing anti-ice valve L ( wing anti-ice valve R ) (TSM CFDS chapter 30).
       2 If none of those warnings or messages is present:
  • Do a check of the PFR and of the SMR for failure message PO/P12/T12, ADC, ECU.
         a If message is present:
  • Do the applicable trouble shooting procedure (TSM CFDS chapter 73).
     (f) If nothing is found or if the fault continues after application of the above steps:
     (g) If the fault continues:
     (h) If the fault continues:
Subtask 73-00-00-810-122-B ** ON A/C NOT FOR ALL
A. If the failure occurred :
   (1) Only in flight and idle speed was correct during ground operation:
  • Do a check of the PFR and of the SMR for failure messages IDG, FRV (Oil temp).
     (a) If there is a failure message:
  • Do the applicable trouble shooting procedure (TSM CFDS chapter 79).
     (b) If there is no message:
     (c) If the fault continues:
  • Check the electrical wiring between the SFCC1(2) and the EIU-1 [1KS1] ( EIU-2 [1KS2] ) ASM 275110.
  • Repair as required.
   (2) Either during flight or ground operation:
  • Do a check of the PFR and the SMR for ECAM status EIU and/or for failure messages :
     (a) If the failure message IDG, FRV (Oil temp) is displayed :
  • Do the applicable trouble shooting procedure (TSM CFDS chapter 79).
     (b) If one of those failure messages EIU (031), J3 or ZC, EIU(ECSD), J3 or ZC, EIU(030), J3 or NO EIU 1(2) DATA is displayed :
  • Do the applicable trouble shooting procedure (TSM CFDS chapter 73 and 21).
     (c) If one of the following failure messages relative to fuel system elements is displayed:
       1 FUEL LEVEL SENSING L OUT TEMP SENSOR 30QJ1 or FUEL LEVEL SENSING R OUT TEMP SENSOR 30QJ2
       2 FUEL LEVEL SENSING L INN TEMP SENSOR 29QJ1 or FUEL LEVEL SENSING R INN TEMP SENSOR 29QJ2
  • Do the applicable trouble shooting procedure for SENSOR-TEMP, LEFT WING TK INNER CHANNEL A or SENSOR-TEMP, LEFT WING TK INNER CHANNEL A [29QJ1] ( SENSOR-TEMP, RIGHT WING TK INNER CHANNEL A or SENSOR-TEMP, RIGHT WING TK INNER CHANNEL A [29QJ2] ) (Ref. TSM TASK 28-46-00-810-813).
       3 FUEL LEVEL SENSING L LO LEVEL SENSOR 38QJ1 or FUEL LEVEL SENSING R LO LEVEL SENSOR 38QJ2
       4 FUEL LEVEL SENSING L SURGE SENSOR 28QJ1 or FUEL LEVEL SENSING R SURGE SENSOR 28QJ2
       5 FUEL LEVEL SENSING FLSCU1 7QJ or FUEL LEVEL SENSING FLSCU2 9QJ
     (d) If none of those messages is present:
  • Do a check of the nacelle anti-ice pushbutton switch (2DN1(2DN2)) on the engine which has the highest idle speed as follows:
       1 Check that with pushbutton switch selected OFF, ground is present at pin AA/B2 ASM 732508.
         a If there is no ground:
         b If ground is present:
  • Check that there is no ground at wire connected to pin AA/C2 of the pushbutton switch ASM 302102.
         c If ground is present:
  • Replace associated nacelle anti-ice valve 4000DN AMM 30-21-51-000-040 and AMM 30-21-51-400-041 or repair wiring.
  • Do a check of the wing anti-ice pushbutton switch (3DL) as follows:
    If there is no ground:
    * replace the P/BSW-ANTI ICE/WING [3DL] .
     (e) If nothing is found:
  • Look for warning failure message including the following words TEMP CTL WAI or WING A.ICE in the PFR.
       1 If message or warning is present:
  • Do the trouble shooting procedure of relevant wing anti-ice valve L ( wing anti-ice valve R ) (TSM CFDS chapter 30).
       2 If none of those warnings or messages is present:
  • Do a check of the PFR and of the SMR for failure message PO/P12/T12, ADC, ECU.
         a If message is present:
  • Do the applicable trouble shooting procedure (TSM CFDS chapter 73).
     (f) If nothing is found or if the fault continues after application of the above steps:
     (g) If the fault continues:
     (h) If the fault continues:
Subtask 73-00-00-710-191-A ** ON A/C NOT FOR ALL
B. Do a minimum idle check AMM 71-00-00-710-006.
   (1) Repeat the fault isolation procedure if the fault continues.
[Rev.8 from Aug 2018] 2026.04.04 04:35:11 UTC
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