TM 5-3805-296-23-1
0040
Table 1. 1785 Intake Manifold Pressure Sensor Diagnostic Codes.
0040
CID FMI
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
1785-03 Intake Manifold
Pressure Sensor Voltage
Always inspect harness connectors that are involved in the circuit. Poor
Above Normal
connections can often be the cause of a problem in an electrical circuit.
Verify that all connections in the circuit are clean and secure and that all
connections are in good condition. If a problem with the connection is
found, correct the problem and verify that this malfunction or diagnostic
code is active before performing this procedure.
Perform open or short-circuit test at each harness connection to identify
the correct harness to replace.
Tag all wiring harnesses to aid in installation.
Perform this test only if condition is active.
DIAGNOSTIC CODE SET CONDITION
Engine ECM Detects Above Normal Voltage on Intake Air Pressure Sensor
Signal Circuit R746.
POSSIBLE CAUSE
Basic Engine Wiring Harness High Resistance, Open, or Shorted.
Intake Air Pressure Sensor.
Engine ECM.
Test Step 1. Test Sensor 5-Volt and
Ground Circuit Function.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
2. Disconnect connector CM-C7
(WP 0012, Figure 22) from intake
air pressure sensor connector
(WP 0012, Figure 21).
3. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-296-10).
4. Using digital multimeter
Voltage Less Than 4.5 V Proceed to
(WP 0540), test for voltage
Test Step 2.
between connector CM-C7
Voltage 5.0 0.5 V Proceed to Test
terminal 1 and terminal 2
Step 3.
(WP 0012, Figure 22).
Test Step 2. 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. Lower left frame access plate
(WP 0376).