TM 5-3805-290-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
ENGINE TEMPERATURE SENSORS OPEN OR SHORT CIRCUIT TEST - CONTINUED
(d) Remove all inactive diagnostic fault codes.
(2)
If results are NOT OK, a short circuit exists between sensor harness connector and ECM. Leave sensor
disconnected. Proceed to step 6.
5.
Create short circuit between signal and common terminals at sensor harness connector.
a.
Turn engine start switch to ON position (TM 5-3805-290-10). Wait at least 15 seconds for activation of any diag-
nostic fault codes. Monitor Active Diagnostic Code screen on MSD before and after installing jumper wire.
b.
Monitor Active Diagnostic Code screen on MSD before and after installing jumper wire.
c.
Use jumper wire 6 in. (15 cm) long with correct terminals installed on both ends of wire.
d.
Install jumper on back of engine harness connector. Install one end of jumper at sensor signal (positive terminal).
Install other end of jumper at common connection for engine temperature sensor (terminal 2). Wait at least 15 sec-
onds for activation of short circuit diagnostic code.
e.
Expected Results. Short circuit diagnostic code is active when jumper is installed. Open circuit diagnostic code is
active when jumper is removed.
(1)
If results are OK, engine harness and ECM are OK. Perform these repairs:
(a) Replace sensor (WP 0063 00 or WP 0064 00).
(b) Verify repair eliminates problem.
(c) Clear all inactive diagnostic codes.
(2)
If results are NOT OK, an open circuit diagnostic code remains active with jumper in place. Most probable
location for open is in sensor common or sensor signal wire in engine harness between ECM and sensor.
Remove jumper. Proceed to step 6.
427-B2075
0013 00-49
