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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE: 1 1
J1587 CODE:
P187 4 - POWER TAKE OFF INPUT FAILED LOW (VOLTAGE LOW)
(ALSO CALLED VARIABLE SPEED GOVERNOR - VSG)
STEP/SEQUENCE
11-13
Check for Outside
DDEC Battery +
l Turn ignition off.
l Remove ECM B-way power
harness connector.
l Remove ECM vehicle harness
connector.
l Turn ignition on.
l Read voltage A3 (916) to a
good ground.
l Read voltage C3 (952) to a
good ground.
11-30 Verify Repairs
l Turn ignition off.
l Reconnect all connectors.
l Turn ignition on.
l Clear codes.
l Note status of “Check Engine”
light.
l if “Check Engine” light does not
stay on, start engine and run
(TM 9-2320-380-10) until
“Check Engine” light comes on
or 1 minute.
l Stop engine.
l Read all codes.
RESULT
WHAT TO DO NEXT
All readings
less then 4.0 volts.
Either reading
greater than or
equal to 4.0 volts.
No codes.
Code 187/4 (and
any other codes).
Any other codes
except Code 187/4.
Outside power is shorted to
either ckt #952 or ckt #916.
Repair short. Then go to
11-30.
All system diagnostics are
complete. Please review this
section from the first step to find
the error.
Go to START-1, pg H-25, to
service other codes.
H-199
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