TM 5-3805-291-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
ENGINE FAN CONTROL SOLENOID CIRCUIT TEST - CONTINUED
Expected Results. Short circuit diagnostic code 06 is active when jumper wire is installed. An open circuit diagnos-
h.
tic code 05 is active when jumper wire is removed.
(1)
If results are OK, short circuit diagnostic code 06 is active when jumper wire is installed. An open circuit
diagnostic code 05 is active when jumper wire is removed. Engine harness and ECM are OK.
Install new engine fan control solenoid (WP 0217 00). Clear any logged diagnostic codes.
(2)
If results are not OK, open circuit diagnostic code 05 remains active with jumper in place. Open circuit is
between ECM and connector for engine fan control solenoid. There may be a problem with ECM. Proceed
to step 5.
5.
Check operation of ECM.
a.
Disconnect J1/P1 ECM connector.
b.
Fabricate two jumper wires long enough to connect terminals of ECM connector. Crimp connector sockets to one
end of each jumper wire.
c.
Remove wire from terminal location P1-43 at ECM connector. Install a jumper wire into this terminal location.
d.
Remove wire from terminal location P1-51 at ECM connector. Install a jumper wire into this terminal location.
e.
Connect J1/P1 ECM connector.
f.
Create an open circuit at ECM:
(1)
Place battery disconnect switch in ON position (TM 5-3805-291-10) to ensure an open circuit condition
exists. Do not allow loose ends of jumper wires to connect.
(2)
Monitor Active Diagnostic Code screen on ET. Wait at least 30 seconds for activation of code. Correct sta-
tus is an active open circuit diagnostic code 05 for engine fan control solenoid.
g.
Create a short at ECM:
(1)
Short jumper wires at ECM connector.
(2)
Monitor Active Diagnostic Code screen on ET. Wait at least 30 seconds for activation of code. Correct sta-
tus is an active short circuit diagnostic code 06 when wire jumper is installed.
(3)
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
h.
Restore all wiring to original configuration.
Expected Results. Open circuit diagnostic code 05 is active when jumper wire from engine fan control solenoid is
i.
open. A short circuit diagnostic code 06 is active when wire for engine fan control solenoid is connected to jumper
wire for digital return.
(1)
If results are OK, 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:
(a) Open circuit diagnostic code 05 is not active when wire for engine fan control solenoid is discon-
nected.
(b) Short circuit diagnostic code 06 is not active when wire jumper is installed.
(c) ECM needs replacing (WP 0057 00). Verify repair eliminates problem.
0013 00-25
