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Page Title:
P187 4 - VERNIER CONTROL INPUT FAILED LOW (VOLTAGE LOW) (ALSO CALLED VARIABLE SPEED GOVERNOR - VSG) (cont) |
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 TM 9-2320-364-20-1
Section IV. TROUBLESHOOTING CHARTS (Cont.)
E. FLASH CODE:
11
J1587 CODE:
P187 4 - VERNIER CONTROL INPUT FAILED LOW (VOLTAGE LOW)
(ALSO CALLED VARIABLE SPEED GOVERNOR - VSG)
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
11-9
Check ECM
Connectors
Check terminals at the
Terminals and
Replace ECM (para 7-57).
vehicle harness connector (both
connectors are okay.
Then go to 11-30.
the ECM and harness side) for
damage; bent, corroded, and
Problem found.
Repair terminals/connectors
unseated pins or sockets.
(para 7-101). Then go to 11-30.
11-10
Check for Short
Turn ignition off.
Less than or
The vehicle +5 volt line
Disconnect the vehicle harness
equal to 10,000 ohms.
(ckt #916) is shorted to the
connector at the ECM.
return line (ckt #952). Repair
Read resistance between sockets
short. Then go to 11-30.
A and C on the vernier control
connector.
Greater than
Go to 11-11.
10,000 ohms or open.
11-11
Check for Open +5 Volt
Line
Install a jumper wire between
Less than
Go to 11-9.
sockets A and C of the vernier
or equal to 5 ohms.
control connector.
Read resistance between sockets
Greater than
The vehicle +5 volt line (ckt
A3 (916) & C3 (952) on the vehicle
5 ohms or open.
#916) is open. Repair open.
harness connector.
Then go to 11-30.
11-12
Check for Short to
Battery +
Turn ignition off.
All readings are
Go to 11-13.
Pull out both DDEC circuit
greater than 10,000
breaker buttons (CB22 & CB23).
ohms or open.
Disconnect 5-way power harness
connector at the ECM.
Any reading is
A short exists between sockets
Read resistance between sockets
less than or equal
where less the 10,000 ohms
D1 (510) & B3 (439) on the vehicle
to 10,000 ohms.
resistance was read. Repair
harness connector.
short and reset circuit breakers.
Also read resistance between
Then go to 11-30.
socket D1 (510) on the vehicle
harness connector and the
following sockets on the 5-way
power harness connector: C, D,
E, and B.
2-621
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