TM 5-3805-298-23-1
0064
Table 1. 1785 Intake Manifold Pressure Diagnostic Codes - Continued.
064
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
6. Using digital multimeter
Voltage Is 4.8 to 5.2 VDC - Replace air
1785-10 Intake Manifold
(WP 0174), test for voltage
(boost) pressure sensor (WP 0242).
Pressure Sensor Signal
between connector E-C8
Abnormal Rate of Change -
Proceed to Test Step 5.
(WP 0012, Figure 30) terminal 1
Continued
Voltage Is Less Than 4.8 VDC -
and terminal 2.
Proceed to Test Step 3.
Test Step 3. Test for Shorted Engine
Control Wiring Harness.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
2. Disconnect connector E-C4
(WP 0012, Figure 10) from engine
ECM connector J2.
3. Using digital multimeter
Continuity - Replace engine control
(WP 0174), test for continuity
wiring harness (WP 0294).
between connector E-C8
Proceed to Test Step 4.
(WP 0012, Figure 30) terminal 1
No Continuity - Proceed to step 4.
and terminal 2.
4. Using digital multimeter
Continuity - Replace engine control
(WP 0174), test for continuity
wiring harness (WP 0294).
between connector E-C8
Proceed to Test Step 4.
(WP 0012, Figure 30) terminal 1
No Continuity - Proceed to Test Step 4.
and ground.
Test Step 4. Test for Open Engine
Control Wiring Harness.
1. Connect jumper wire between
terminal 1 and terminal 2 of
connector E-C8 (WP 0012,
Figure 30).
2. Using digital multimeter
Resistance 5.0 Ohms or Less -
(WP 0174), measure resistance
Replace engine ECM (WP 0265).
between connector E-C4
Proceed to Test Step 5.
(WP 0012, Figure 10) terminal 46
Resistance Greater Than 5.0 Ohms -
and terminal 38.
Replace engine control wiring harness
(WP 0294).
Proceed to Test Step 5.
Test Step 5. Verify Malfunction Is
Resolved.
1. Ensure all harness connectors are
connected.
2. Install right engine access panel
(WP 0348).
0064-7
