TM 5-3805-296-23-1
0040
Table 1. 1785 Intake Manifold Pressure Sensor Diagnostic Codes Continued.
040
CID FMI
TEST OR INSPECTION
CORRECTIVE ACTION
6. Using digital multimeter
1785-03 Intake Manifold
Continuity Replace basic engine
(WP 0540), test for continuity
Pressure Sensor Voltage
wiring harness (WP 0251).
between connector CM-C1
Above Normal Continued
Proceed to Test Step 7.
terminal 15 (WP 0012, Figure 30)
No Continuity Proceed to step 7.
and all other terminals
in connector CM-C1
(WP 0012, Figure 30).
7. Using digital multimeter
Continuity Replace basic engine
(WP 0540), test for continuity
wiring harness (WP 0251). Replace
between connector CM-C1
engine interface wiring harness
terminal 15 (WP 0012, Figure 30)
(WP 0211).
and all terminals in connector
Proceed to Test Step 7.
CL-C1 (WP 0012, Figure 45).
No Continuity Replace engine ECM
(WP 0252).
Proceed to Test Step 7.
Test Step 5.Test Intake Air Pressure
Sensor Signal Circuit Function.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
2. Connect jumper wire between
terminal 3 and terminal 2
of connector CM-C7
(WP 0012, Figure 22).
3. Turn battery disconnect switch to
ON position and start engine
(TM 5-3805-296-10).
4. At MSD, check for active
1785-4 Intake Manifold Pressure
diagnostic code 1785-4 Intake
Sensor Voltage Below Normal
Manifold Pressure Sensor Voltage
Becomes Active Replace intake air
Below Normal (WP 0008).
pressure sensor (WP 0245).
Proceed to Test Step 7.
1785-3 Intake Manifold Pressure
Sensor Voltage Above Normal
Remains Active Proceed to Test
Step 6.
Test Step 6. Test Basic Engine
Wiring Harness for High Resistance
or Open.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
2. Do not remove jumper wire from
terminal 3 and terminal 2
of connector CM-C7
(WP 0012, Figure 22).
0040-5
