STEP/SEQUENCE RESULT WHAT TO DO NEXT TM 9-2320-363-20-1 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) 11-5 Check PTOSA Connectors Inspect terminals at the PTOSA Terminals and Replace PTOSA.  Then go to connectors (sensor side and connectors are okay. 11-30. harness side) for damage; bent, corroded, and unseated pins or Problem found. Repair terminals/connectors. sockets. Then go to 11-30. 11-6 Check for +5 Volts Remove jumper. Between Go to 11-7. Turn ignition on. 4 to 6 volts. Read voltage on PTOSA harness, connector, socket C (red lead) to Less than Go to 11-10. socket A (black lead). 4 volts. Greater than Go to 11-12. 6 volts 11-7 Check for Short Turn ignition off. Less than or Signal line (ckt#525) is Disconnect the vehicle harness equal to 10,000 ohms. shorted to the return line connector ECM. (ckt#952).  Repair short. Read resistance between sockets Then go to 11-30. A and B on the PTOSA harness Greater than Go to 11-8. connector. 10,000 ohms or open. 11-8 Check for Signal Open Install a jumper wire between Less than Go to 11-9. sockets A and B of the PTOSA or equal to 5 ohms. harness connector. Read resistance between sockets Greater than Signal line (ckt#510) is D1 (510) & C3(952) on the vehicle 5 ohms or open. open, and/or signal return connector (ckt#952) is open. . Repair open.  If no open was found, check ECM terminals A3, D1, C3 and PTO pins. Then go to 11-30. Change 3  3-345.183