TM 5-3805-291-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
ENGINE TEMPERATURE SENSOR OPEN OR SHORT CIRCUIT TEST - CONTINUED
N OT E
Wait at least 30 seconds for diagnostic codes to become active.
g.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
Expected Results. An 04 diagnostic code is now active for suspect sensor.
h.
(1)
If results are OK, an 03 diagnostic code was active before creating short at sensor connector. An 04 diag-
nostic code became active after creating short at sensor connector. Install new sensor (WP 0077 00, WP
0082 00, and WP 0084 00). Clear any logged diagnostic codes.
(2)
If results are not OK, an 03 diagnostic code is still active for suspect sensor. Proceed to step 5.
5.
Check operation of ECM.
a.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
b.
Check operation of ECM by creating an open circuit at ECM.
(1)
Disconnect ECM connector for suspect sensor.
(2)
Fabricate a jumper wire long enough to reach from a terminal at ECM connector to engine ground stud.
Crimp a connector socket to one end of jumper wire.
(3)
Remove signal wire for suspect sensor from ECM connector. Install jumper wire into terminal location for
signal wire of suspect sensor.
(4)
Connect ECM connectors.
(5)
Place battery disconnect switch in ON position (TM 5-3805-291-10).
(6)
Monitor Active Diagnostic Code screen on ET. Wait at least 30 seconds for activation of code.
(7)
An open circuit diagnostic code 03 will be active for suspect sensor.
c.
Check operation of ECM by creating a short at ECM.
(1)
Short jumper wire installed into ECM connector to engine ground.
(2)
Monitor Active Diagnostic Code screen on ET. Wait at least 30 seconds for activation of code.
(3)
A short circuit diagnostic code 04 will be active for suspect sensor.
(4)
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
d.
Remove wire jumper. Reconnect all wires and connectors.
Expected Results. An 03 diagnostic code is active when sensor signal wire is open. An 04 diagnostic code is active
e.
when jumper wire is shorted to engine ground.
(1)
If results are OK, ECM is working properly. Problem is in wiring between ECM and sensor connector.
(a) If code is active for more than one sensor, problem is most likely in return wire for sensor. Replace
wiring harness in question (WP 0195 00 thru WP 0201 00). Ensure seals are properly in place and
connectors are securely connected. Verify repair eliminates problem.
(b) If code is only active for one sensor, problem is most likely in signal wire for sensor. Replace wiring
harness in question (WP 0195 00 thru WP 0201 00). Ensure seals are properly in place and connectors
are securely connected. Verify repair eliminates problem.
(2)
If results are not OK, one of these conditions exists: An 03 diagnostic code is not active when sensor signal
wire is disconnected. An 04 diagnostic code is not active when wire jumper is installed. Replace ECM
(WP 0057 00). Verify original problem is resolved.
0013 00-45
