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401
TM 9-2320-312-24-2
Troubleshooting Section
Test Step 1. Inspect Electrical Connectors
and Wiring.
g00649124
Illustration 176
Terminal locations for ECM
A. Thoroughly inspect ECM vehicle harness
Results:
connector J1/P1, the firewall bulkhead connector,
OK Proceed to Test Step 2.
and the terminals for the tachometer in the
connectors. Refer to Troubleshooting, "Electrical
Not OK
Connectors - Inspect" for details.
B. Perform a 45 N (10 lb) pull test on each of the
Repair: Perform the following repair:
wires in the ECM connector that are associated
with the terminals for the tachometer:
1. Repair the connectors or wiring and/or replace
the connectors or wiring. Ensure that all of the
P1:38
seals are properly in place and ensure that the
connectors are completely coupled.
P1:39
2. Verify that the repair eliminates the problem.
Refer to Illustration 176.
STOP.
C. Check the ECM connector (allen head screw) for
Test Step 2. Check the ECM Connection
the proper torque of 6.0 Nm (55 lb in).
to the Tachometer.
D. Check the harness and wiring for abrasion and
pinch points from the battery to the ECM.
A. Inspect ECM connector J1/P1. Verify that the
connections are present at P1:39 Tachometer-
Expected Result:
and/or P1:38 Tachometer+.
All connectors, pins and sockets should be
Note: Some of the tachometers require only one
completely coupled and/or inserted and the harness
signal line to be connected. Either of the ECM
and wiring should be free of corrosion, abrasion
terminals can be used for this type of tachometer.
or pinch points.
The other wire should be left disconnected. If both
wires are connected, and one indicates an open
circuit, repair this line.

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