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REFERENCE DESIGNATION
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AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring)
3. Fault Confirmation
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A. Do the operational test of the FADEC 2A and 2B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
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A. If the test gives the maintenance messages T25 SNSR, J11, ECU + T25 SNSR, J12, ECU:
- do a check for open or short to ground of the harnesses J11 and J12 between the ECU (4000KS) and the 6 o'clock junction box, between the 6 o'clock junction box and the T25 temperature sensor pins J11 and J12/19, 37, 38 to pins J11 and J2/1, 2, 3.
(1) If one of these wirings is not correct:
- repair the defective above wirings.
(2) If these wirings are correct: R - disconnect the harnesses J11 and J2 from the ECU (4000KS). R - do a visual inspection of the harness connector and receptacle. R Look for contamination or oxidation or pins that have damage. R - if you find damage, repair or replace as required. R - clean the connector and receptacle with a bristle brush and R stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-R 002). R - do a check of each ECU cable resistance between: R
. pins 37 and 38 (160 to 250 Ohms)
. pins 37 and 19 (> 10 Megohms)
. pin 37 and ground (> 10 Megohms)
(a) If the resistance values are in the specified limits:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) (Ref. AMM TASK 73-21-60-400-001).
(b) If the resistance values are out of the specified limits: R - disconnect the harnesses CJ11 and CJ12 at 6 o'clock junction R box. R - do a visual inspection of the harness connector and receptacle. R Look for contamination or oxidation or pins that have damage. R - if you find damage, repair or replace as required. R - clean the connector and receptacle with a bristle brush and R stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-R 210-002). R - do a check of the resistance cables CJ11R and CJ12R between:
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1_ If the resistance values are in the specified limits:
for cable CJ11R
. pins 25 and 26 (160 to 250 Ohms)
. pins 25 and 13 (> 10 Megohms)
. pin 25 and ground (>10 Megohms)
for cable CJ12R
. pins 15 and 16 (160 to 250 Ohms)
. pins 15 and 13 (> 10 Megohms)
. pin 25 and ground (>10 Megohms)
- replace the defective harness J11 (Ref. AMM TASK 73-21-50-
000-044) (Ref. AMM TASK 73-21-50-400-044) or
- replace the defective harness J12 (Ref. AMM TASK 73-21-50-
000-045) (Ref. AMM TASK 73-21-50-400-045)
2_ If the resistance values are out of the specified values:
R - disconnect the harnesses CJ11R and CJ12R at T25 sensor.
R - do a visual inspection of the harness connector and
R receptacle. Look for contamination or oxidation or pins that
R have damage.
R - if you find damage, repair or replace as required.
R - clean the connector and receptacle with a bristle brush and
R stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-
R 50-210-002).
R - do a check of the T25 sensor resistance between:
R
for cable CJ11R
. pins 1 and 2 (160 to 250 ohms)
. pin 1 and ground (> 10 Megohms)
for cable CJ12R
. pins 1 and 2 (160 to 250 ohms)
. pin 1 and ground (> 10 Megohms)
a_ If the resistance values are in the specified limits:
- replace the defective harness CJ11R (Ref. AMM TASK 73-21-
50-000-026) (Ref. AMM TASK 73-21-50-400-026) or
- replace the defective harness CJ12R (Ref. AMM TASK 73-21-
50-000-028) (Ref. AMM TASK 73-21-50-400-028).
b_ If the resistance values are out of the specified limits:
- replace the engine 2 T25 temperature sensor (Ref. AMM
TASK 73-21-20-000-002) (Ref. AMM TASK 73-21-20-400-002).
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