STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
E. FLASH CODE: 12
J1587 CODE: - P187 3 - POWER TAKE OFF (PTO) INPUT FAILED HIGH (HIGH VOLTAGE)
(ALSO CALLED VARIABLE SPEED GOVERNOR - VSG)
12-5 Check for Short to
+5 Volt Line
Connect all connectors to ECM.
Greater than 1.0 volts
Signal line (ckt#510 or #525)
Turn ignition on.
is shorted to the vehicle +5
Read voltage on PTOSA harness
Volt line (ckt#916) or another
connector pin B (525) to pin
voltage source. Repair short.
A (957).
Then go to 12-30.
Less than or equal
Go to 12-6.
to 1.0 volts.
12-6 Check for Open
Connect all connectors to ECM.
Greater than
Check for open in wire #952
Read voltage on PTOSA harness
4.5 volts.
between PTOSA and ECM. It
at Pin B (525) and Pin A
may be a bad terminal in the
(952) with ignition on.
ECM connector (C3). Repair
and go to 12-30. If no problem
was found, then go to 12-7.
Less than
Go to 12-7.
4.5 volts.
12-7 Check ECM
Connectors
Disconnect the vehicle harness
Terminals and
Reprogram ECM. Then go
connector.
connectors are okay.
to 12-30.
Check terminals at the ECM
vehicle harness connector (both
Problem found.
Repair terminals/connectors.
ECM and harness side) for
Then go to 12-30.
damage; bent, corroded, and
unseated pins or sockets.
Change 3 3-345.191
