TM 5-2410-241-23-1
0019
Table 2. Engine Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
274-3 Atmospheric Pres-
5. Turn battery disconnect switch
sure Open/Short to
and ignition switch to ON position
+Batt - Continued
(TM 5-2410-241-10).
6. Check for Diagnostic Codes or
1. If active 274-4 code is present,
Event Codes (WP 0013).
replace atmospheric pressure
sensor (WP 0090). Ensure all har-
ness connectors are reconnected.
Verify correct operation of
machine (TM 5-2410-241-10).
2. If active 274-3 code is present,
proceed to step 7.
7. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-2410-241-10).
8. Remove jumper wire from atmo-
spheric pressure sensor connec-
tor N-C4 (WP 0018, Figure 35)
between pin B and pin C.
9. Disconnect engine ECM connec-
tor N-C1 (WP 0018, Figure 2).
10. Using digital multimeter
1. If continuity is found, proceed to
(WP 0296), test for continuity
step 11.
between pin B on atmospheric
2. If continuity is not found, replace
pressure sensor connector N-C4
ECM harness (WP 0105). Ensure
(WP 0018, Figure 35) and pin 3
all harness connectors are recon-
on engine ECM connector N-C1
nected. Verify correct operation of
(WP 0018, Figure 2).
machine (TM 5-2410-241-10).
11. Using digital multimeter
1. If continuity is found, proceed to
(WP 0296), test for continuity
step 12.
between pin C on atmospheric
2. If continuity is not found, replace
pressure sensor connector N-C4
ECM harness (WP 0105). Ensure
(WP 0018, Figure 35) and pin 14
all harness connectors are recon-
on engine ECM connector N-C1
nected. Verify correct operation of
(WP 0018, Figure 2).
machine (TM 5-2410-241-10).
12. Using digital multimeter
1. If continuity is found, replace ECM
(WP 0296), test for continuity
harness (WP 0105). Ensure all
between pin 14 engine ECM con-
harness connectors are recon-
nector N-C1 (WP 0018, Figure 2)
nected. Verify correct operation of
and all other pins on engine ECM
machine (TM 5-2410-241-10).
connector N-C1 (WP 0018,
2. If continuity is not found, replace
Figure 2).
engine ECM (WP 0101). Ensure
all harness connectors are recon-
nected. Verify correct operation of
machine (TM 5-2410-241-10).