Engine cranks but will not start. No link to PCM

Was the new PCM programmed ? Dealer . Your best bet , take it to the dealer or someother qualified repair shop.
EEPROM Programming
Set-up - Ensure that the following conditions have been met:
• The battery is fully charged.
• If the battery required charging, disconnect the charging equipment before reprogramming the PCM.
• The ignition is ON.
• The Techline equipment cable connection at the DLC is secure.
Program the PCM using the latest software matching the vehicle. Refer to up-to-date Techline equipment user's instructions.
If the PCM fails to program, proceed as follows:
• Ensure that all PCM connections are OK.
• Check the Techline equipment for the latest software version.
• Attempt to program the PCM. If the PCM still cannot be programmed properly, replace the PCM. You must program the replacement PCM.
• Perform the Crankshaft Variation Learn Procedure. Refer to Crankshaft Position System Variation Learn .
Functional Check
Perform the On-Board Diagnostic System Check. Refer to Powertrain On Board Diagnostic (OBD) System Check .
Start the engine and let the engine run for one minute.
Use the scan tool in order to scan for the DTCs.

Did you hook up a fuel pressure gauge an test pressure an flow ? Does it have spark ? What engine does it have ? 4.6 or 5.4 L Have a scan tool to view engine management sensor inputs to the PCM ? 003 Engine Peformance Tests Scan Data Tests

Turning ignition switch to start position ! Nothing happens , no click , nothing ?
Circuit Description
Moving the ignition switch to the CRANK position sends a 12 V signal to the PCM Ignition Crank Sense. The PCM verifies that the transmission is in the PARK or NEUTRAL position. The PCM then grounds the control circuit of the START relay. When the START relay is energized it allows voltage to the starter solenoid S terminal.

Starter Solenoid Does Not Click

2
Turn the ignition to the START position.
Does the engine crank?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the Crank Request Signal parameter in the PCM data list.
Turn the ignition to the START position.
Does the scan tool display Yes?
YES - Go to Step 5
NO - Go to Step 4
4
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the Crank Request Signal parameter in the PCM data list.
Turn the ignition to the START position.
Does the scan tool display Yes?
YES - Go to Step 11
NO - Go to Range Selector Displays Incorrect Range in Automatic Transaxle - 4T80- E
5
Turn OFF the ignition.
Disconnect the Starter relay.
Turn ON the ignition, with the engine OFF.
Connect a test lamp between the battery positive voltage of the Starter relay coil circuit and a good ground.
Does the test lamp illuminate?
YES - Go to Step 6
NO - Go to Step 19

This is troubleshooting info from GM factory service testing and repair manual .A scan tool isn't necessary , you could use a test light if you knew which pins at the PCM . For example , testing Crank Request Signal parameter in the PCM data list. Find this wire circuit at the PCM , with a test light .When turning the key to start position ,does the test light light ? A factory scan tool just cuts down the time of diagnoses . A wiring diagram is a must for diagnosing this . Free wiring diagrams can be found at
http://www.bbbind.com/free_tsb.html There are videos on youtube on basic automotive electrical trouble shooting , Control module diagnostics . That is if you don't know how to already .

Circuit Description
Moving the ignition switch to the START position sends a 12 V signal to the PCM Ignition Crank Sense. The PCM verifies that the transmission is in the PARK or NEUTRAL position. The PCM then grounds the control circuit of the START relay. When the START relay is energized it allows battery positive voltage to the starter solenoid S terminal.
Turn the ignition switch to the START position.
Does the engine crank?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3

3

Is the security indicator flashing?
Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent
Go to Step 4

4

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Starter Relay Command parameter in the PCM data list.
4. Turn the ignition switch to the START position.

Does the scan tool display Yes

5

1. Turn ON the ignition, with the engine OFF.
2. Verify that the transmission is in Park or Neutral.
3. With a scan tool, observe the IMS parameter in the Transmission data list.

Does the scan tool display Park or Neutral?
Go to Step 12
Go to Transmission Internal Mode Switch Logic in Automatic Transaxle - 4T65- E

6

Turn the ignition switch to the START position.
Do you hear the STARTER relay click?
Go to Step 9
Go to Step 7
Your best bet is to take your vehicle to a qualified repair shop. Before you replace a part an find out that's not what's wrong . If you new how to test the starter circuit , you would start at the starter relay .

You best bet is take to a ASE certified repair shop or a GM dealer ! When replacing crank sensor a special procedure has to be done with a scan tool .
Crankshaft Position System Variation Learn
The Crankshaft Position System Variation Learn Procedure should be performed if any of the following conditions are true:
?€¢
DTC P1336 is set

?€¢
The PCM has been replaced

?€¢
The engine has been replaced

?€¢
The crankshaft has been replaced

?€¢
The crankshaft harmonic balancer has been replaced

?€¢
The crankshaft position sensor has been replaced
Important: Set the vehicle parking brake and block the drive wheels when performing the crankshaft position system variation learn procedure in order to prevent personal injury. Release the throttle when the engine reaches the SECOND fuel cut off. Leaving the throttle open during the fuel cut-off will allow the engine to decel at an even rate. Once the learn procedure is completed, the PCM will return the engine control to the operator and the engine will respond to the throttle position.
Important: The scan tool crankshaft position system variation learn function will be inhibited if engine coolant temperature is less than 70?°C (158?°F). Allow the engine to warm to at least 70?°C (158?°F) before attempting the crankshaft position system variation learn procedure.
The scan tool crankshaft position system variation learn function will be inhibited if any powertrain DTCs other than DTC P1336 are set before or during the crankshaft position system variation learn procedure. Diagnose and repair any DTCs if set.
The crankshaft position system variation learn function will be inhibited if the PCM detects a malfunction involving the camshaft position signal circuit, the 3X reference circuit, or the 18X reference circuit.
?€¢
If the scan tool indicates a problem with the cam signal, refer to DTC P0341 .

?€¢
If the scan tool indicates a problem with the 3X crank signal, refer to DTC P1374 .

?€¢
If the scan tool indicates a problem with the 18X crank signal, refer to DTC P0336 .

Now why do you want to replace these thing's ? mite be able to save you some time an money. Do you have a check engine light lit ? Codes ? Does it start an run ?

Did you reset computer
You can do this by removing battery positive and leaving off for about 5 mins make sure you have radio code though

wont crank or cranks fast but will not start,????????
wow first thing replaced the most expensive part on car.? why ?
replace PCM. ! wow ! what if used PCM (is it used) is bad,?
if so now 2 problems, Compounding every thing,.....$$$$$$$$

last time it ran was 1 week ago , 1 year, what? miles on it?
bad fuel in tank , old?
why not elaborate that key symptom first.?
there is a cluster there.
gauges, warning lights. many, all must glow.
lets do this dance, posted 100 times;. now.

1. head lights work not dim? key in pocket.
2. key on, not cranked ! (covered in missing oper. guide)
3. all warning lights glow, if not battery is weak or fuses blown.
4. and the CEL lamp there, it must glow or the PCM has no power ,that too, is a blown PCM fuse. fact. (or lamp dead)
5. lets say the lamp was dead,CEL the scan tools hows status of the lamp and all else, so use a $10 scan too now. does it communicate with the PCM and show all sensors and not DTC errors? scan it now, cant fix cars now , with no scan tool , buy one, and win on old cars. big time with pay back !!! heck all cars. 96+
6. so the CEL glows now, good, now you crank, now, does the crank shaft turn fast cranking, yes/no. yes !
7. then check for spark , got spark x 6?
8. got spark well test fuel works now , even with dry gas tank.
9. is the ASD relay closing and then dropping,? ( yes, and yes)
10. then that means the PCM cut fuel , on purpose !!!!
11. the scan tool tells you why. it did drop for sure. scan it.

1993 to now , MR. ASD 101

http://www.fixkick.com/Jeeps/ASD.html

PCM is the engine EFI brain, it runs all spark and all fuel all the time. it also dumps the ASD to stop engine fires, by law.
confuses many, and all cars have this, one way or the other,
all EFI cars.

There are very complex electronics on your vehicle , you people have no ideal what all is involved in starting your vehicle .It's all computer controlled , the PCM - engine computer has to see electrical inputs from different thing's before it will energize the starter crank relay located in the under hood fuse box .

Circuit Description
Moving the ignition switch to the start position sends a 12 volt signal through the PCM (CRANK) fuse in the Junction Block - Left I/P to the PCM to notify the PCM that a crank status has been requested. 12 volts is fed through the ABS/PCM fuse in the Junction Block - Left I/P to the coil side of the CRANK RLY . The PCM grounds this circuit when all parameters are met for starting the engine. This closes the CRANK RLY allowing Battery Positive voltage through Fusible Link and through the switch side of the CRANK relay to the S terminal of the starter solenoid. Ground is found through the engine block.

The PCM has to see correct enable message from the theft- deterrent module an it also has to see a voltage signal through the transmission range sensor , this shows that the vehicle is in park or neutral . Video's on youtube testing relay's . VEHICLE RELAYS Testing from the relay base Jumping pin's 87 & 30 will crank the engine . 85 & 86 are the control side .

VEHICLE RELAYS Operation Diagnosis

Starter Solenoid Does Not Click

2
Turn the ignition switch to the START position.
Does the engine crank?
YES - Go to Testing for Intermittent Conditions and Poor Connections
NO - Go to Step 3
3
Install a scan tool.
With a scan tool, observe the Security Lamp State parameter in the BCM Security Data list.
Turn the ignition switch to the START position.
Does the scan tool display On?
YES - Go to Diagnostic Trouble Code (DTC) List - Vehicle
NO -- Go to Step 4
4
With a scan tool, observe the Starter Relay Command parameter in the PCM data list.
Turn the ignition switch to the START position.
Does the scan tool display Yes?
YES - Go to Step 5
NO - Go to Step 13
5
With a scan tool, observe the Crank Request parameter in the PCM data list.
Turn the ignition switch to the START position.
Does the scan tool display Yes?
YES - Go to Step 21
NO - Go to Step 6

There are very specific step's to diagnosing problems like this an if you don't follow them you may never find the problem . You don't need a expensive scan tool to fix it but having one would make it a whole lot easier .

I can help with testing, but, you have to do the testing. Use a digital multimeter and make sure battery has a full charge? Also, check your charging system? If the battery is down, we can't do any testing, we're just spinning our wheels.
If the starter motor won't crank, check the starter motor wiring circuits.
If the battery has a full charge, unplug the starter relay, use a jumper wire on the load side of relay, the load side is that line with arrowhead, the starter motor should crank the engine. That doesn't mean it will start. If you try that, make sure tranny is in park or neutral and parking brake is set.

Try replacing spark plugs and battery, check the distributor cap.