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
3. Disconnect connector E-C8
1785-3 Intake Manifold
(WP 0012, Figure 30) from intake
Pressure Sensor Signal
manifold pressure sensor.
Voltage Is Above Normal or
4. Disconnect connector E-C4
the Voltage Is Shorted High -
(WP 0012, Figure 10) from engine
Continued
ECM connector J2.
5. Using digital multimeter
Continuity - Replace engine control
(WP 0174), test for continuity
wiring harness (WP 0294).
between connector E-C4
Proceed to Test Step 4.
(WP 0012, Figure 10) terminal 55
No Continuity - Proceed to Test Step 3.
and all other E-C4 terminals.
Test Step 3. Test for Open Engine
Control Wiring Harness.
1. Connect jumper wire between
terminal 3 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 air (boost) pressure sensor
between connector E-C4
(WP 0242).
(WP 0012, Figure 10) terminal 55
Proceed to Test Step 4.
and terminal 38.
Resistance Greater Than 5.0 Ohms -
Replace engine control wiring harness
(WP 0294).
Proceed to Test Step 4.
Test Step 4. Verify Malfunction Is
Resolved.
1. Ensure all harness connectors are
connected.
2. Install right engine access panel
(WP 0348).
3. Using MSD, check for active
Diagnostic Code 1785-3 Intake
diagnostic codes (WP 0008).
Manifold Pressure Sensor Signal
Voltage Is Above Normal Becomes
Inactive - Troubleshooting complete.
Diagnostic Code 1785-3 Intake
Manifold Pressure Sensor Signal
Voltage Is Above Normal Remains
Active - Repeat troubleshooting from
the beginning.