1995 Buick Riviera No start

MIKEB73

MEMBER
1995 BUICK RIVIERA
6 CYL
FWD
AUTOMATIC
170,000 MILES

The engine has spark no injector pulse. There is no RPM at the computer the security light flashes only when you open the doors. Is there a problem with the security or is this normal? No codes in the PCM

Tuesday, September 9th, 2008 AT 11:08 AM

7 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Any signal from the crank sensor? And you can try a reset for the sec
Have you done a relearn on the pass-key?
GM PASS LOCK RELEARN- Ignition to "run" position, try to start and let key return to "run" position
Approx ten minutes security light will go off
Turn key "off" and wait 5 seconds
Repeat 2 more times for a total of 3 relearns.
Turn key off, then start it
urity system.

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Tuesday, September 9th, 2008 AT 1:47 PM

MIKEB73

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5 POSTS

This riv has the resistance chip on the metal part of the key. The security light only flashes with the door is open. There is crank signal at ignition control module. No signal at the computer. I traced all the wires from the ICM to the PCM and found no bad wires or corroded connections. I tried to replace the PCM with no luck. Do you know where the security module is? Any suggestions would also help.

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Tuesday, September 9th, 2008 AT 2:38 PM

MERLIN2021

MECHANIC
17,250 POSTS

ANTI-THEFT SYSTEM -1995 Buick Riviera
Page 1 of 1
ENGINE CRANKS BUT DOES NOT START
1.Turn ignition off. Disconnect PASS-Key II decoder module connector. Turn ignition on. Measure voltage between PASS-Key II decoder module harness connector terminal A3 and ground. If voltage is about 5 volts, go to step 3). If voltage is not about 5 volts, go to next step. 2.Check Dark Blue wire for an open circuit or short to ground. Also check PCM connector C3, terminal D5 for good connection. If all circuits are okay, problem is with PCM. See the appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. If circuits are not okay, repair as necessary. Refer to the following list.
� � � 3.8L, see: TESTS W/CODES - 3.8L
� � � 4.0L, see: TESTS W/CODES - 4.0L 3.If voltage was about 5 volts in step 1), turn ignition off. Reconnect PASS-Key II decoder module connector. Turn ignition on. Backprobe PASS-Key II decoder module, measuring voltage between terminal A3 and ground. If about 2.5 volts are present, system is okay. If about 2.5 volts are not present, check PASS-Key II decoder module connector terminal A3 for good connection. If terminal contact is okay, replace decoder module. PASS-KEY II(R) SYSTEM
1.Look into key opening and check key pellet sensing contacts in ignition key lock cylinder. If contacts are damaged, or not Silver in color, replace lock cylinder. Check ignition keys using PASS-Key II(R) Interrogator (J-35628-A). If key code window displays "E", or display is erratic, replace key. 2.Check ignition key for cracked, dirty or coated resistor pellet. Ensure key does not have excess plastic around resistor pellet contacts. If system is intermittent, check module connector for tightness.

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Tuesday, September 9th, 2008 AT 4:47 PM

MERLIN2021

MECHANIC
17,250 POSTS

To look up more info I need engine size in liters 3.8? Or 4.0?

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Tuesday, September 9th, 2008 AT 4:49 PM

MIKEB73

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5 POSTS

Thanks for all your help. I found the problem. Double checked fuses with key on. All fuses had 12V, injection fuse dropped to 0V durring cranking. Found corroded wire between the fuse boxes under the back seat and the inj fuse in the dash fuse box.