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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE:
11
J1587 CODE:
P187 4 - POWER TAKE OFF INPUT FAILED LOW (VOLTAGE LOW)
(ALSO CALLED VARIABLE SPEED GOVERNOR - VSG)
STEP/SEQUENCE
11-9
Check ECM
Connectors
l Check terminals at the
vehicle harness connector (both
the ECM and harness side) for
damage; bent, corroded, and
unseated pins or sockets.
11-10
Check for Short
l Turn ignition off.
l Disconnect the vehicle harness
connector at the ECM.
l Read resistance between sockets
A and C on the vernier control
connector.
11-11
Check Check for Open
+5 Volt line
l install a jumper wire between
sockets A and C of the vernier
control connector.
l Read resistance between sockets
A3 (916) & C3 (952) on the vehicle
harness connector.
11-12
Check for Short to
Battery +
l Turn ignition off.
l Pull out both DDEC circuit
breaker buttons (CB 20 & 21).
l Disconnect 5-way power harness
connector at the ECM.
l Read resistance between sockets
D1 (510) & B3 (439) on the vehicle
harness connector.
l Also read resistance between
socket D1 (510) on the vehicle
harness connector and the
following sockets on the 5-way
power harness connector: C, D,
E, and B.
RESULT
Terminals and
Replace ECM (para 7-29.1).
connectors are okay.
Then go to 11-30.
Problem found.
Repair terminals/connectors
(para 7-77). Then go to 11-30.
Less than or
equal to 10,000 ohms.
Greater than
10,000 ohms or open.
Less than
or equal to 5 ohms.
Greater than
5 ohms or open.
All readings are
greater than 10,000
ohms or open.
Any reading is
less than or equal
to 10,000 ohms.
WHAT TO DO NEXT
(ckt #916) is shorted to the
return line (ckt #952). Repair
short. Then go to 11-30.
The vehicle +5 volt line (ckt
#916) is open. Repair open.
Then go to 11-30.
A short exists between sockets
where less the 10,000 ohms
resistance was read. Repair
short and reset circuit breakers.
Then go to 11-30.
H-107
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