4. Fault Isolation
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A. If the test gives the maintenance message VBV SNSR, J11, ECU + VBV 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 VBV sensor (RVDT) (Ref. ASM 73-25/18) and (Ref. ASM 73-25/18) and (Ref. ASM 73-25/18).
(1) If one of these wirings is not correct:
- repair the defective above wirings.
(2) If these wirings are correct:
- disconnect the cables J11 (Channel A) and J12 (Channel B) from the ECU (4000KS) and do a resistance check of the cables J11 and J12 between: . pins 13 and 29 (80 to 110 Ohms) . pins 30 and 31 (80 to 120 Ohms) . pins 15 and 32 (80 to 120 Ohms) . pins 13 and 14 (> 10 Megohms) . pins 30 and 14 (> 10 Megohms) . pins 15 and 14 (> 10 Megohms) . pin 13 and the ground (> 10 Megohms) . pin 30 and the ground (> 10 Megohms) . pin 15 and the ground (> 10 Megohms).
(a) If the resistance values are in the specified limits:
- replace the VBV sensor (RVDT) (Ref. AMM TASK 75-31-70-000-001) and (Ref. AMM TASK 75-31-70-400-001).
- if the problem is still reported after the VBV sensor replacement, replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(b) If the resistance values are out of the specified limits:
- disconnect the cables J11 and J12 from the cables CJ11L and CJ12L at the 6 o'clock junction box and do a resistance check of the cables CJ11L and CJ12L between: for cable CJ11L . pins 5 and 6 (80 to 110 Ohms) . pins 2 and 7 (80 to 120 Ohms) . pins 3 and 4 (80 to 120 Ohms) . pins 5 and 1 (> 10 Megohms) . pins 2 and 1 (> 10 Megohms) . pins 3 and 1 (> 10 Megohms) . pin 5 and the ground (> 10 Megohms) . pin 2 and the ground (> 10 Megohms) . pin 3 and the ground (> 10 Megohms). for cable CJ12L . pins 17 and 6 (80 to 110 Ohms) . pins 18 and 19 (80 to 120 Ohms) . pins 8 and 20 (80 to 120 Ohms) . pins 17 and 7 (> 10 Megohms)
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. pins 8 and 7 (> 10 Megohms)
. pin 17 and the ground (> 10 Megohms)
. pin 18 and the ground (> 10 Megohms)
. pin 8 and the ground (> 10 Megohms).
1 If the resistance values are in the specified limits:
_
- replace the defective harness J11 (Ref. AMM TASK 73-21-50-000-044) and (Ref. AMM TASK 73-21-50-400-044) or harness J12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
2 If the resistance values are out of the specified limits:
_
- disconnect the cables CJ11L and CJ12L from the VBV sensor and do a resistance check of the VBV sensor between: . pins 2 and 3 (80 to 110 Ohms) . pins 4 and 5 (80 to 120 Ohms) . pins 6 and 7 (80 to 120 Ohms) . pin 2 and the ground (> 10 Megohms) . pin 4 and the ground (> 10 Megohms) . pin 6 and the ground (> 10 Megohms).
a If the resistance values are in the specified limits:
_
- replace the defective harness CJ11L (Ref. AMM TASK 73-21-50-000-025) and (Ref. AMM TASK 73-21-50-400-025) or harness CJ12L (Ref. AMM TASK 73-21-50-000-027) and (Ref. AMM TASK 73-21-50-400-027).
b If the resistance values are out of the specified limits:
_
- replace the VBV sensor (RVDT) (Ref. AMM TASK 75-31-70-000-002) and (Ref. AMM TASK 75-31-70-400-002).
B. Do the test given in Para. 3.A.
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TASK 75-30-00-810-813
Loss of the VBV Feedback Signal - Engine 1 - Channel A
1. Possible Causes
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- VBV sensor (RVDT)
- ECU (4000KS)
- harness HJ11
- harness CJ11L
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-025 Removal of the CJ11L Harness AMM 73-21-50-000-044 Removal of the HJ11 Harness AMM 73-21-50-210-001 Visual Inspection of the Wiring Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-025 Installation of the CJ11L Harness AMM 73-21-50-400-044 Installation of the HJ11 Harness 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) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
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