Mechanics

CHEVY STALLING

2000 Chevrolet Express

Electrical problem
2000 Chevy Express V8 Two Wheel Drive Automatic

I have a 2000 1500 5.7 express van we bought and use for my wife who is handicapped. The problem is it will stop running at any time. I have put new pcm. Icm. Coil. Crank sensor, dist. Rotor and it still dies on us. If I let it sit overnight, it starts fine and can be drivien for about an hour then I start having stalling problems. It is very frustrating and I don't have anyother way to handle it now but ask for help. I get a P1351 code when it fails. Please help.
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Joelcrownover
May 23, 2009.



DTC P1351: IGNITION CONTROL CIRCUIT - HIGH VOLTAGE (5.0L, 5.7L & 7.4L) NOTE: For circuit reference, see WIRING DIAGRAMS article. Circuit Description Enhanced ignition system provides timing input to VCM with a crank sensor. VCM utilizes reference pulse to determine individual ignition spark timing for each cylinder. Once VCM calculates ignition timing, timing signal is sent to ignition coil module. Each timing pulse received by ignition coil module triggers module operation of ignition coil. Secondary ignition voltage is induced then sent to distributor for distribution to each spark plug. IC signal voltage ranges from about 0.5 volt to 4.5 volts. DTC will set when EST is enabled, engine speed is less than 250 RPM and EST voltage is greater than 4.9 volts. Diagnostic Procedures Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step. 1. Clear DTCs. Disconnect injector connector. Crank engine for 30 seconds. Check if DTC P1351 is set. If DTC P1351 is set, go to next step. If DTC P1351 is not set, see DIAGNOSTIC AIDS . 2. Turn ignition off. Reconnect injector connector. Disconnect ignition control module harness connector. Using DVOM in A/C scale and connected to ground, probe ignition control module harness connector terminal "B". Crank engine and note voltage reading. If voltage reading is 1- 4 volts, go to step 9 . If voltage reading is not 1-4 volts, go to next step. 3. Turn ignition off. Disconnect VCM harness connector. Using DVOM, check for open in IC control circuit between VCM harness connector terminal No. 9 and ignition control module harness connector terminal "B". If circuit is open, go to next step. If circuit is okay, go to step 6 . 4. Repair open in IC control circuit between VCM and ignition control module. After repairs, go to step 17 . 5. Reconnect VCM harness connector. Turn ignition on, with engine off. Check voltage between ground and ignition control module harness connector terminal "B". If voltage reading is greater than one volt, go to next step. If voltage reading is not greater than one volt, go to step 8 . 6. Repair short to voltage in IC control circuit between VCM and ignition control module. After repairs, go to step 17 . 7. Check for poor VCM connection. If connection is faulty, go to step 15 . If connection is okay, go to step 16 . 8. Turn ignition off. Using test light connected to battery voltage, probe ignition control module harness connector terminal "C". If test light illuminates, go to step 11 . If test light does not illuminate, go to next step. 9. Repair open in ignition control module ground circuit. After repairs, go to step 17 . 10. Turn ignition on. Using test light connected to ground, probe ignition control module harness connector terminal "A". If test light illuminates, go to step 13 . If test light does not illuminate, go to next step. 11. Repair open in ignition control module ignition feed circuit. After repairs, go to step 17 . 12. Check for poor connection at ignition control module. If a problem is found, go to step 15 . If no problem is found, go to next step. 13. Replace ignition control module. After replacing module, go to step 17 . 14. Repair circuit as necessary. After repairs, go to step 17 . 15. Replace VCM. Program replacement VCM using required equipment and perform CKP Variation Learn Procedure. See DTC P1336 test. After replacing VCM, go to next step. 16. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2 . 17. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test. 18. Diagnostic Aids An intermittent may be caused by a poor connection, rubbed-through wire insulation or a broken wire inside insulation. Inspect VCM harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connection, and damaged harness. If connections and harness are okay, using DVOM connected between ignition feed circuit and IC control circuit of VCM connector, monitor voltage while wiggling related connectors and wiring harnesses. If a failure is induced, voltage will change. A change in voltage will assist in isolating location of fault.


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Merlin2021
May 24, 2009.