TM 9-6115-647-14&P
Table 4-2. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5.
ICC/CRG LOW FUEL WARNING LIGHT DOES NOT GO ON WHEN FUEL LEVEL DROPS BELOW 13
GALLONS.
Step 1.
Disconnect P4, P7 fuel cable from fuel tank and adapter plate assembly. Using multimeter,
check continuity between P4 pin A and P7 pin A, and between P4 pin C and P7 pin C.
a.
If continuity does not exist between both pairs of test points, replace cable.
b.
If fuel cable is not defective, go to step 2.
Step 2.
Disconnect P12 from J41 on generator set and disconnect J3 from P3 (primary power unit) or
P11 (standby unit). Using multimeter, check continuity between J4 pin A and P12 pin D, and
between J4 pin C and J3 pin F.
a.
If continuity does not exist between either pair of test points, replace wiring harness
(para 4-18) or notify higher level of maintenance for repair.
b.
If wiring harnesses are not defective, go to step 3.
Step 3.
Disconnect control cable from PDU connector J6. Using multimeter, check continuity between
J6 pin F and P3 (primary power unit) or J10 (standby unit) pin F.
a.
If continuity does not exist, go to step 4.
b.
If continuity exists, go to step 5.
Step 4.
Check continuity between P3 pin F and TB1-16 (primary power unit) or between J10 pin F and
TB1-15 (standby unit), check continuity between TB1-15 or TB1-16 and CR1 pin A or CR2 pin
A, as applicable, check continuity between CR1 pin B or CR2 pin B and TB1-14, check
continuity between TB1-14 and J6 pin F.
a.
If continuity does not exist between P3 or J10 pin F and TB1, replace P3 cable
(paragraph 4-22) or J10 wiring harness (paragraph 4-24.c).
b.
If continuity does not exist between TB1-14, TB1-15 or TB1-16 and CR1 or CR2,
replace control relay/diodes wiring harness (paragraph 4-24.f).
c.
If continuity does not exist between TB1-14 and J6 pin F, replace J6 wiring harness
(paragraph 4-24.b).
d.
If continuity exists between each pair of test points, go to step 5.
4-18
