STEP/SEQUENCE RESULT WHAT TO DO NEXT TM 9-2320-363-20-1 Section 4 TROUBLESHOOTING CHARTS E. FLASH CODE:  18 J1587 CODE: P724 - BYPASS POSITION CIRCUIT FAILED HIGH (HIGH VOLTAGE) 18-8 Check for Open +5 Volt Line Turn ignition off. Less than or equal Go to 18-9. Disconnect the engine equal to 5 ohms. harness connector at the ECM. Install a jumper wire between Greater than The engine +5 Volt line (ckt pins A and C of the BPS harness 5 ohms or open. #416) is open. Repair open. connector. Then go to 18-30. Read resistance between sockets W1 and Y2 on the engine harness connector. 18-9 Check for Short Remove jumper wire. Less than or The +5 Volt line (ckt#416) is Read resistance between pins A equal to 10,000 ohms. shorted to the return line (ckt and C on the BPS harness #452). Repair short. Then go connector. to 18-30. Greater than Go to 18-7. 10,000 ohms or open. 18-10 Check for Short to Battery + Turn ignition off. All readings are Go to 18-7. Remove both fuses to the greater than 10,000 ohms ECM. or open. Disconnect the engine harness, vehicle harness and 5-way power Any reading is A short exists between the harness connectors at the ECM. less than or equal to sockets where less than 10,000 Read resistance between socket 10,000 ohms. ohms resistance was read. R1 of the engine harness Repair short and reinsert fuses connector and socket B3 of the (or reset breakers). Then go vehicle harness connector. to 18-30. Also read resistance between socket R1 on the engine harness connector and the following sockets on the 5-way power harness connector: A and C. Change 3  3-345.227