TM 9-6115-729-24
0011
TROUBLESHOOTING FAILURES WITHOUT FAULT CODES - Continued
SYMPTOM
5.
Display of Current on GSC is Zero For One or More Phases.
MALFUNCTION
GSC Malfunction.
CORRECTIVE ACTION
STEP 1.
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 2.
Tag and disconnect wire 151B16 from ATB A5 terminal TBC-51 (leave wire
disconnected until finished troubleshooting) (FO-4, sheet 3).
STEP 3.
Measure resistance between end of wire and terminal TBC-50. If resistance is
not less than 1 ohm, check wiring and/or replace CT1 (WP 0051).
STEP 4.
Tag and disconnect wire 152B16 from terminal TBC-52.
STEP 5.
Measure resistance between end of wire and terminal TBC-50. If resistance is
not less than 1 ohm, check wiring and/or replace CT2 (WP 0051).
STEP 6.
Tag and disconnect wire 153B16 from terminal TBC-53.
STEP 7.
Measure resistance between end of wire and terminal TBC-50. If resistance is
not less than 1 ohm, check wiring and/or replace CT3 (WP 0051).
STEP 8.
Measure resistance between ATB A5 terminals A5 TBC-51 and TBC-50. If
resistance is not less than 1 ohm, replace ATB A5 (WP 0041 Guide).
STEP 9.
Measure resistance between ATB A5 terminals A5 TBC-52 and TBC-50. If
resistance is not less than 1 ohm, replace ATB A5 (WP 0041 Guide).
STEP 10.
Measure resistance between ATB A5 terminals A5 TBC-53 and TBC-50.
a. If resistance not less than 1 ohm, replace ATB A5 (WP 0041 Guide).
b. If ATB A5 is good, replace GSC (WP 0040).
STEP 11.
Disconnect P7 from rear of GSC (FO-4, sheet 1).
STEP 12.
Measure resistance between pins P7-4 and P7-16.
a. If resistance is not 100 to 140 ohms, repair or replace wiring (WP 0043).
b. If wiring is good, replace ATB A5 (WP 0041 Guide).
STEP 13.
Measure resistance between pins P7-5 and P7-16.
a. If resistance not 100 to 140 ohms, repair or replace wiring (WP 0043).
b. If wiring is good, replace ATB A5 (WP 0041 Guide).
STEP 14.
Measure resistance between pins P7-6 and P7-16.
a. If resistance not 100 to 140 ohms, repair or replace wiring (WP 0043).
b. If wiring is good, replace ATB A5 (WP 0041 Guide).
STEP 15.
Verify the problem has been resolved.
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