93 SSEi no start-PCM? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-12-2006, 09:08 PM   #11
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Could be the TPS (Throttle Position Sensor). If the PCM is getting a signal that the throttle is wide open it'll cut the fuel supply. Give us a few minutes to look up how to check the TPS.
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Old 08-12-2006, 09:39 PM   #12
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Code 21 should be TPS Voltage High.

Voltage gets higher as the throttle opens so we might be headed in the right direction. My Chilton'* manual gives a very poor desciption on testing the sensor. I'm going to look at a wiring diagram but if anyone knows how to check TPS voltage please jump in.
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Old 08-12-2006, 09:44 PM   #13
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Old 08-12-2006, 10:31 PM   #14
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I checked TPS and i get .41 at idle and 4.00 at WOT (engine off) . That'* a correct value.
What else could be causing no injector pulse?
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Old 08-13-2006, 12:04 PM   #15
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Let'* go back to the battery. Make sure both ends of all the battery cables have good clean connections. Maybe even swap batteries again. If that doesn't help check connections going to the ICM & PCM.
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Old 08-13-2006, 02:48 PM   #16
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I'd check for corrosion inside the ground from the battery. Flexing over time cracked the sheath and allowed water to pool in mine.
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Old 08-14-2006, 12:58 PM   #17
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I bought this battery a week ago, it'* all tight, and clean.
When there is no start, engine is cranking like it should be, spark is there, positive side of injector plug is ok, but there is no groung pulse. Maybe it'* the wire harness. Where can i find diagram of PCM pinout? Ii'll check it there, and check the ground wire for resistance.
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Old 08-14-2006, 01:33 PM   #18
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The wiring diagram I have for the 93 isn't the best but here'* what it'* showing for PCM grounds.

Black Connector
A6 - Blk/Wht
B6 - Blk/Wht
D13 - Blk/
C13 - Wht
That'* the way the diagram is showing D13 & C13. They're probably both Blk/Wht

Orange Connector
D2 - Tan

I prefer to test the grounds with a 12 volt test light. A meter could show it as good while a bulb could be dim.
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Old 08-14-2006, 07:29 PM   #19
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Quote:
Originally Posted by George85442
Maybe it'* the wire harness. Where can i find diagram of PCM pinout? Ii'll check it there, and check the ground wire for resistance.
You may not find it grounded. The negative side of each injector is switched on & off by the PCM. It'* a pulse type switching signal to ground each injector to fire at the appropriate time during an ignition cycle.
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Old 08-14-2006, 08:12 PM   #20
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I may have misunderstood what George wanted to check. The grounds I listed above are for the PCM. I'd still check those, if the PCM isn't properly grounded the switches in the PCM wouldn't be able to complete the circuit.

These are the terminals that go to the fuel injectors.
#1 - C15 - Blk
#2 - D16 - Blk/Lt Grn
#3 - C12- Blk/Pnk
#4 - C14 - Blk/Lt Blu
#5 - C16 - Blk/Wht
#6 - D15 - Blk/Yel
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