TM 5-2410-241-23-1
0019
Table 2. Engine Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
172-3 Intake Manifold Air
1. Connect MSD (WP 0016). Select
1. If active 172-3 code is present,
Temp Open/Short to
3176C D7 engine ECM and check
proceed to step 2.
+Batt
for Diagnostic Codes or Event
2. If no active codes are present,
Codes (WP 0013).
problem does not exist at this
time. Resume normal operation.
2. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-2410-241-10).
3. Disconnect ECM harness connec-
tor NC-C2 (WP 0018, Figure 25)
from Intake manifold air tempera-
ture sensor (WP 0066).
4. Turn battery disconnect switch
and ignition switch to ON position
(TM 5-2410-241-10).
5. Using a digital multimeter
1. If 4.5-5.5 Volts is found, proceed
(WP 0296), measure for voltage
to step 6.
between pin 1 and pin 2 on ECM
2. If 4.5-5.5 Volts is not found, pro-
harness connector NC-C2
ceed to step 9.
(WP 0018, Figure 25).
6. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-2410-241-10).
7. Install jumper wire between pin 1
and pin 2 on intake manifold air
temperature jumper connector
NC-C2 (WP 0018, Figure 25).
8. Check for Diagnostic Codes or
1. If active 172-4 code is present,
Event Codes (WP 0013).
Replace intake manifold tempera-
ture sensor (WP 0066). Ensure all
harness connectors are recon-
nected. Verify correct operation of
machine (TM 5-2410-241-10).
2. If active 172-3 code is present,
proceed to step 9.
9. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-2410-241-10).
10. Remove jumper wire from intake
manifold air temperature jumper
connector NC-C2 (WP 0018,
Figure 25) between pin 1 and
pin 2.
0019-51
