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#103208 - 09/04/02 10:02 AM Pagin C4 C5 Specialist
Arisa Offline
Member

Registered: 11/30/00
Posts: 204
Loc: Backwoods town called Monroe. ...
HELP !!!!!

Arisa is together cranks but won't fire

FYI 96' LT4

No DTC's
ALL fuses are good.

I have gone through the DI system check (pg 6-646 Engine Controls)

1) OBD check preformed Yes (goto step 2)
2) Any spark iginition wires No (goto step 4)
4) Any spark at coil No (goto step 5)
5) DVM on A&D of coil module (each to gnd) Both less than 10V No (10.67 & 10.43) (goto step 6)
6) Is only one less then 10 V No (goto step 7)
7) DMV on terminal B of coil module ACV 1-4V Yes (goto step 8)
(I say yes here but the battery was getting very low & wouldn't keep cranking. I will double check this tonight)
8) test light B+ & terminal C Any light Yes (goto step 9)
(I say yes here because I used my DVM and had 11V across the terminals)
9) Repair the coil module ground circuit. wth ???

My diagrams show terminal C going to ground at ground point G107 (drivers side bell housing). Well that ISN'T the case here. Terminal C goes into the computer (Clear/Grey Connector Pin #2). The diagram for distributor ignition system check shows a blk/wht wire for C while the PCM layout says Lt blu/blk. The wiring in the car is lt blu/blk.

I am very confused. According to the diagram it's a damn ground circuit !!! Yes the light will be on if you connect a test light between it & B+ duh. WHAT am I missing ???

I think the flow chart for distributor system check is for a pre 96 car & that there is a different on for the OBDII cars (96+) & somehow the wrong one endded up in my helms manual.

Thanks

Neal
_________________________
96' Arctic White LT4


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#103209 - 09/04/02 08:29 PM Re: Pagin C4 C5 Specialist
c4c5specialist Offline
Member

Registered: 07/10/01
Posts: 1612
Loc: conn
[QUOTE]Originally posted by Arisa:
[QB]HELP !!!!!

Arisa is together cranks but won't fire

FYI 96' LT4

No DTC's
ALL fuses are good.

I have gone through the DI system check (pg 6-646 Engine Controls)

1) OBD check preformed Yes (goto step 2)
2) Any spark iginition wires No (goto step 4)
4) Any spark at coil No (goto step 5)
5) DVM on A&D of coil module (each to gnd) Both less than 10V No (10.67 & 10.43) (goto step 6)
6) Is only one less then 10 V No (goto step 7)
7) DMV on terminal B of coil module ACV 1-4V Yes (goto step 8)
(I say yes here but the battery was getting very low & wouldn't keep cranking. I will double check this tonight)
8) test light B+ & terminal C Any light Yes (goto step 9)
(I say yes here because I used my DVM and had 11V across the terminals)
9) Repair the coil module ground circuit. wth ??? """ FIRST OFF, THIS STEP IS REVISED. DID YOU CHECK TERMINAL CONTACT ON ALL PINS???????? """"
NOW ALSO, PLEASE GIVE ME A RESISTANCE VALUE FOR PIN C TO GROUND, WITH THE PCM CONNECTORS DISCONNECTED.
THIS IS ABSOLUTELY CRITICAL. IF YOU PUT A TEST LIGHT TO THAT CIRCUIT, YOU MAY HAVE BLOWN THE PCM.

My diagrams show terminal C going to ground at ground point G107 (drivers side bell housing). Well that ISN'T the case here. Terminal C goes into the computer (Clear/Grey Connector Pin #2). The diagram for distributor ignition system check shows a blk/wht wire for C while the PCM layout says Lt blu/blk. The wiring in the car is lt blu/blk. """"JUST REMEMBER, THAT ALL GROUND CIRCUITS WILL BE BLACK, WITH WHITE TRACER, SO YOU ARE OK, AS LONG AS YOUR RESISTANCE VALUES SHOW LESS THAN 5 OHMS. ALSO, YOUR TERMINALS ARE JOINED, THAT GROUND THE PCM, IGNITION MODULE DRIVER, AND THE WINDSHIELD MOTOR. REFERENCE PG 8A-14-3, IN VOLUME 1.

I am very confused. According to the diagram it's a damn ground circuit !!! Yes the light will be on if you connect a test light between it & B+ duh. WHAT am I missing ???

"""""ALSO, IF YOU PUT A TESTLIGHT TO BATTERY POSITIVE, AND THEN TOUCH THE TERMINAL B CONNECTOR AT THE IGNITION COIL, THIS SHOULD BLINK WHEN THE CAR IS TURNED OVER. ONLY APPLY THE TESTLIGHT TO TERMINAL B, WHICH IS THE DARK GREEN WIRE AT THE IGNITION COIL. MAKE SURE YOUR BATTERY IS FULLY CHARGED, OTHERWISE, YOUR READINGS MAY NOT BE CORRECT."""""""""

I think the flow chart for distributor system check is for a pre 96 car & that there is a different on for the OBDII cars (96+) & somehow the wrong one endded up in my helms manual.

PLEASE KEEP US POSTED, AS YOU ARE ON THE RIGHT TRACK. WE CAN NAIL THIS.
YoursinCorvette, c4c5 hammer
_________________________
c4c5 Chevrolet dealership mechanic, ASE Master Technician w/L1. COFFEE ADDICT. A persons judgement is only as good as the information they have, which should be FACT, not fiction.


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