Click here to make tpub.com your Home Page

Page Title: Test Step 10. Bypass the Harness Wiring Between the ECM and the Sensor Connector
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

TM 9-2320-312-24-2
Troubleshooting Section
3. Verify that the repair eliminates the problem.
6. If the problem returns with the suspect ECM,
replace the ECM.
STOP.
7. Verify that the repair eliminates the problem.
Not OK Restart this procedure and carefully
perform each step. STOP.
STOP.
Test Step 10. Bypass the Harness
i01606388
Wiring Between the ECM and the Sensor
Connector.
Engine Running Output Circuit
- Test
A. Turn the ignition key switch to the OFF position.
SMCS Code: 1900-081
B. Disconnect ECM engine harness connector
J2/P2, and the sensor connector.
System Operation Description:
C. Remove the sensor signal wire from ECM
Use this procedure under the following situation:
connector P2 on the engine harness.
Use this procedure in order to determine if the
D. Remove the signal wire (terminal "C") from the
circuit for the Engine Running Output is operating
sensor connector on the engine harness .
properly.
E. Fabricate a jumper wire that is long enough to
The following background information is related
reach from the ECM to the sensor connector or
to this procedure:
use an engine sensor harness bypass with 3
terminals.
Personality Modules that have a Software Date
Code dated earlier than OCT01.
Note: If an engine sensor harness bypass is being
made, crimp a Deutsch socket on one end in order
The Engine Running Output is located on ECM
to connect to the ECM. Crimp either a Deutsch pin
J1/P1:13 (Output 4).
or a Deutsch socket on the other end, as required.
The engine running output comes on when the
F. Insert the engine sensor harness bypass into
engine is running. The engine running output turns
the ECM connector P2 on the engine harness.
off when the engine rpm equals 0. This can be
Insert the other end of the engine sensor harness
used to prevent the engagement of the starter
bypass into the sensor connector of the engine
motor while the engine is running. The ECM can
harness .
be connected to a relay that disables the starter.
The relay is normally closed so cranking can be
G. Reconnect ECM engine harness connector J2/P2
achieved immediately at powerup. During cranking,
and the sensor connector.
the ECM energizes the engine running output once
engine rpm reaches 50 rpm below low idle. The
H. Turn the ignition key switch to the ON position.
output is de-energized if the engine speed falls
below the programmed low idle by 100 rpm. The
I. Monitor the "Active Diagnostic Code" screen for
low idle rpm is programmable. The range for low
either the open circuit diagnostic code for the
idle is between 700 rpm and 800 rpm.
sensor or the short circuit diagnostic code for
the sensor.
Expected Result:
The diagnostic code disappears when the jumper
or the bypass is installed.
Results:
OK There is a problem in the wiring harness.
Repair: Perform the following repair:
1. Repair the faulty wiring harness or replace the
faulty wiring harness.
2. Clear all diagnostic codes.

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business