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Forum: S-Series Tech 08-16-2016, 01:36 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

This xmission shop appears to be working with you, giving an honest assessment. You have nothing to lose but time examining wiring between pcm and xmission connections and measuring solenoid...
Forum: S-Series Tech 08-06-2016, 02:37 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

Three TRS fuses in the underhood fuse box.
Forum: S-Series Tech 08-06-2016, 01:54 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

With two (presumed in good operating condition) pcm's having the same results of three xmission error codes and the car originally exhibiting a sudden failure to start, problems seem to shift while...
Forum: S-Series Tech 07-29-2016, 12:19 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

According to service manual procedures, new pcm's are programmed and calibrated by GM using their Tech II scantool. No mention of using donor pcm's so this may present additional issues. Replacing a...
Forum: S-Series Tech 07-19-2016, 09:52 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

It's not plug n' play. GM's Passlock security program is embedded in the pcm and bcm to work together. All you need to do is disconnect battery negative, wait for a minute, replace the pcm, reconnect...
Forum: S-Series Tech 07-18-2016, 08:39 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

I honestly don't know what else to check (sight unseen). The crank sensor is the only generator of electronic pulses, the electronic heart beat of the pcm in to operate the EFI system (fuel pump....
Forum: S-Series Tech 07-18-2016, 06:24 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

RB56, in a nutshell, if you do not see spark and injectors aren't operating (no fuel smell or wet spark plugs), problems are narrowed down to the crank sensor, wiring between crank sensor and pcm.
Forum: S-Series Tech 07-18-2016, 06:20 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

A partial reprint from service manuals;

The CKP sensor is located in the back of the engine block near the starter motor. It produces an AC voltage of different amplitude, as high as 125 volts,...
Forum: S-Series Tech 07-18-2016, 10:06 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

After you turned on ignition and saw fuel pressure, bled pressure off while leaving ignition ON, did you try starting see if fuel pressure comes back up? The same signal that turns on pump operation...
Forum: S-Series Tech 07-17-2016, 10:16 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

Did you turn the ignition key to START? The pump will not run again until starting attempts are made (trying to startup).
Forum: S-Series Tech 07-16-2016, 01:25 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

Maybe this can help clarify how fuel pumps operate. The pcm commands a 12v signal to (pin 87?) on the pump relay coil with coil already grounded. The pump command signal is the same signal whether...
Forum: S-Series Tech 07-16-2016, 04:21 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

Being unfamiliar with EFI systems and differentiating between a fuel pump operating at ignition ON time (engine off) or during starting can only be checked one way; as soon as ignition is turned on...
Forum: S-Series Tech 07-15-2016, 03:47 PM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

I've never checked crank sensor output when mine failed soft (intermittent). After replacement the engine started up as of nothing ever occurred. Bench tests with a multimeter showed resistance...
Forum: S-Series Tech 07-15-2016, 06:33 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

I too am surprised the engine can run without spark on starting fluid.........my guess is compression is helping ignite ether(?).

Now that compression is back to normal (from a faulty loaner),...
Forum: S-Series Tech 07-14-2016, 11:00 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

My apologies as I was up all night replacing front struts (a first for me) and a do over to correct a mistake. I can now say what not to do when replacing struts.

While there may be a difference...
Forum: S-Series Tech 07-14-2016, 09:00 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

Fuel pressure is not in question. Injector operation is and is a direct command from the pcm. In order for the pcm to make injectors operate, Passlock must not be activated (please answer questions),...
Forum: S-Series Tech 07-14-2016, 08:35 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

1-Under normal circumstances, spark is never generated with ignition key in the ON position. Spark is generated only when the crank sensor sends timing signals to allow the pcm to operate fuel pump,...
Forum: S-Series Tech 06-23-2016, 11:42 AM
Replies: 74
Views: 6,497
Posted By fdryer
Re: 02 SL2 Injectors not pulsing

It would be extremely difficult for anyone to hear a fuel pump run while starting. The best way to know if a pump runs is to connect a fuel pressure gauge to the fuel test port on the fuel rail where...
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