Question about 2001 Chevrolet Impala

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How can u test the pcm .have no power to fuse

Cars battery is good.start is good . replaced ignition already . Have no power to little wire on starter also.

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Posted on Jan 02, 2017

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alicantecoli
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SOURCE: 1997 Chevrolet Z71 Pickup (intermittent start)

saved me the job of answering ,which would have been the same

Posted on Nov 22, 2008

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SOURCE: 1994 Chevy Astro Van- four wheel drive

Sounds like the auto shut down relay. Located somewhere in the front grille/bumper area. Relay triggers on impact to shut down all power in order to prevent fires etc. Great idea but can cause exactly the frustration you are having if you don't know it's there!!

Posted on Dec 18, 2008

  • 3 Answers

SOURCE: no power to ignition 96 camero dl

Check the wires to the distributer or to the modules could be poor or no conection. If you can turn the car over but no spark it's probably something to do with ignition, distributer, module, or wiring to the ignition.

Posted on Jan 25, 2009

  • 102 Answers

SOURCE: Purple solenoid wire shorted, no pwr coming from ign switch

look for a 5 amp fuse, crank fuse in car, not under hood

Posted on May 10, 2009

  • 10 Answers

SOURCE: 2003 impala -starter will not engage/no interior

youre problem posible cuase by ignition swith possible no supply from battery.maybe wire were disconnected

Posted on Jan 28, 2010

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I havever a Pontiac Bonneville SSEI 2001, I want to replace the neutral safety switch but I can't find it. Is this where it should be?


Before you replace a part you don't need ! Are you familiar with how the starting system works on this vehicle . Did you test with a scan tool or even a voltmeter to see if the PCM is receiving voltage through the Park neutral safety switch . You can't find it because it is inside the transmission. An it is called Transmission Internal Mode Switch .
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.
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 in Wiring Systems
NO - Go to Step 3

3
Is the security indicator flashing?
YES - Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent
NO - Go to Step 4

4
Install a scan tool.
Turn ON the ignition, with the engine OFF.
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 6
NO - Go to Step 5

5
Turn ON the ignition, with the engine OFF.
Verify that the transmission is in Park or Neutral.
With a scan tool, observe the IMS parameter in the Transmission data list.
Does the scan tool display Park or Neutral?
YES - Go to Step 12
NO - 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?
YES - Go to Step 9
No - Go to Step 7

7
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 circuit of the STARTER relay coil and a good ground.
Does the test lamp illuminate?
YES - Go to Step 8
NO - Go to Step 20

8
Connect a test lamp between the battery positive voltage circuit of the STARTER relay coil and the control circuit of the STARTER relay.
Turn the ignition to the START position.
Does the test lamp illuminate?
YES - Go to Step 16
NO - Go to Step 14
9
Turn OFF the ignition.
Disconnect the STARTER relay.
Connect a test lamp between the battery positive voltage circuit of the STARTER relay switch and a good ground.
Does the test lamp illuminate?
YES - Go to Step 10
NO - Go to Step 21

10
Connect a 30 amp fused jumper between the battery positive voltage circuit of the STARTER relay switch and the starter solenoid crank voltage circuit.
Does the engine crank?
YES - Go to Step 16
NO - Go to Step 11

11
Does the fuse in the jumper open?
YES - Go to Step 22
NO - Go to Step 13

12
Turn OFF the ignition.
Disconnect the PCM harness connector.
Connect a test lamp between the crank request input circuit of the PCM and a good ground.
Turn the ignition to the START position.
Does the test lamp illuminate?
YES - Go to Step 19
NO - Go to Step 15

13
Test the starter solenoid crank voltage circuit for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 27
NO - Go to Step 17
13
Test the starter solenoid crank voltage circuit for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 27
Go to Step 17

14
Test the control circuit of the STARTER relay for an open or short to battery voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 27
NO - Go to Step 19

15
Test the crank voltage circuit of the PCM for a high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 27
NO - Go to Step 18

16
Inspect for poor connections at the STARTER relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 27
NO - Go to Step 23

17
Inspect for poor connections at the starter solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 27
NO - Go to Step 24

18
Inspect for poor connections at the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 27
NO - Go to Step 25

19
Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 27
Go to Step 26

20
Repair an open or high resistance in the battery positive voltage circuit of the STARTER relay coil. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 27
--

21
Repair the open or high resistance in the battery positive voltage circuit of the STARTER relay switch. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 27
--

22
Repair the short to ground in the starter solenoid crank voltage circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?
Go to Step 27
--

23
Replace the STARTER relay.
Did you complete the replacement?
Go to Step 27
--

24
Replace the Starter Motor. Refer to Starter Motor Replacement .
Did you complete the replacement?
Go to Step 27
--

25
Replace the ignition switch. Refer to Ignition and Start Switch Replacement in Instrument Panel Gauges and Console.
Did you complete the replacement?
Go to Step 27
--

26
Important:: Perform the set up procedures for the PCM. Refer to Powertrain Control Module Programming in Engine Controls - 3.8L.
Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 3.8L.
Did you complete the replacement?
Go to Step 27
--

27
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2

Jun 30, 2016 | Pontiac Cars & Trucks

3 Answers

There is no reaction when turning the key to start the car


Turn key to On.
Turn on headlights manually... Do they come on?
Are there any lights on the dash?
If yes to these, battery is possibly not the sole problem.
Check for good, tight and clean connections at battery terminal posts!
If yes to above, continue on & get a helper... Turn key past on, to Start position.
Do you hear a click sound at time key is turned to Start?
If yes, then ignition switch is not problem, starter relay is getting power, and is now sending power to starter, but starter is not working.
Pic any No's... Then look there.
Good luck.

Mar 29, 2015 | 2005 Ford Focus 1.6

1 Answer

2002 PT Ignition start fuse blowing


PCM?? No they are wrong I think, keep looking at every wire fuse 30 supplies power to, you will need buy the factory wiring diagrams.

Oct 24, 2012 | 2006 Chrysler PT Cruiser

1 Answer

2005 GMC Yukon XL will not start. Took starter off and had it tested. The starter is good. However, the PCM fuse is blowing when attempting to start truck or turning turning the switch to start the tr


There is a dead short to ground on that circuit . There are videos on youtube showing how to find an fix a short . Do you know how to do automotive electrical testing ? How to find automotive electrical shorts Look at the wiring harness under the hood for rubbed through wire's , harness going to the PCM , also find out what if any thing else is powered by that fuse . Which PCM fuse ? There are a few PCM 1 , PCM B , etc...

PCM 1 Fuse
15A
Powertrain Control Module (PCM), Mass Air Flow (MAF) Sensor, Evaporative Emission (EVAP) Canister Purge Solenoid, Fuel Composition Sensor, Secondary Fuel Pump Relay

PCM B Fuse
20A
Powertrain Control Module (PCM)

Any one of these fuse will cause the engine not to crank . The PCM energizes the starter relay which supply's power to the starter .

Mar 11, 2017 | 2005 GMC Yukon XL

1 Answer

97 Breeze electrical issue. Battery is fully charged, but won't start. Starter is silent, no relay clicks or other sounds. Instrument panel lights up. Windows and locks all work. I thought the...


percyhey, The first idea is to check the starter itself. You will need a test light for this procedure. Jack up the car and put jackstands under the frame to support it. PLEASE DO NOT go under the car with out them. Ramps would be easier and safer if you have them. Locate the starter and the little wire going to the solenoid. Remove the wire and find a good ground for the test light. The negative battery terminal is best if your test light wires are long enough. If not then use the body or engine as a ground and test this by touching the test light probe to the large wire on the starter and see if it lights up. If the small wire is bolted to the starter then you dont have to remove it, just make sure that it is intact. Touch the test light probe at the small wire and have someone try to start the engine. If it lights up then you have power going to the starter and the solenoid is malfunctioning and the starter needs to be replaced. Seeing that you have already tested the fuses and relays and replaced the ignition switch then this is the only possibility left. If you dont have power going to the solenoid then check the battery wires. Good luck with this.

May 08, 2011 | 1997 Plymouth Breeze

1 Answer

Will not crank turn key and nothing happens the car has power the starter is good the battery is good the relays are all good


Check fuse # 28 (15 Amp) with a test light. (Located in the Power Distribution Center (PDC) on the left side of the engine compartment) It should have power only when the ignition switch is turned to the START position. If there is no power there, then you probably have a bad ignition switch. The only other fuse involved would be fuse #8 (40 Amp) which is also in the PDC. If this fuse is blown a whole lot of stuff is not going to work - not just your starter. The starter motor relay (Also in the PDC) is controlled by the PowertrainControl Module. The wiring diagrams show it as a 5 pin relay whereonly 4 of the pins are used. If you check for power and ground at the connector pins for the relay, there should be one pin that is hot all the time. This is the power from fuse #8. a second pin should be hot with the key in the RUN and START positions. This would be the circuit running through fuse# 28. One pin should have continuity to ground (your test light should light up if you hook it to the battery positive terminal and probe this terminal.) This is the circuit that goes down to the starter. The 4th pin will have no continuity to anything at all until the ignition is placed in the START position, when it will have continuity to ground. This is the relay control circuit from the PCM.
If you dont have power at the relay connector as described, then you must repair the circuits between the fuses and the relay. If you don't have the grounds as describedfor the starter circuit, you ether have an open circuit going to the starter or a bad starter. If you are not getting ground on the control circuit from the PCM, it could be several other things causing your no-crank problem. It could be an open circuit between the starter relay and the PCM or it could be that the PCM is not allowing an engine start for one reason or another - The PCM will have to be scanned to find out what the problem is.

Mar 05, 2011 | 2004 Jeep Liberty

1 Answer

My car won't start I don't hear it crank


Get a test light, and see if your starter has battery power, (big wire/stud) on starter. itll light up if you do. then there should be a little wire. thats your igntion switch wire. have someone start your car while you testing the little wire. if the light comes on. then your starter is probably bad, even if its new they still can be bad. If it doesnt light up then, you need to locate the starter relay in engine compartment,I should have one. test to see if it clicking when you try to start it. youll feel it. If not pull it out and test to see if you have power. do the same test with someone starting it and see if you light comes on. If it comes on then replace the relay. and you could try and see if your ignition fuse is ok. I hope this gets you started. if not right back were your stuck at.

Apr 12, 2009 | 1996 Nissan Altima

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