Question about 2003 Kia Sorento

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Crank no start

Does the computer control the ground to the main relay?

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2002 chevy trailblazer and it will not crank or start and the key has gotten stuck in the ignition. I also got a jumpstart and it still didn't start. What is wrong, Please?


Could be a number of thing's , can you do automotive electrical testing ? Do you know if starting is PCM / ECM controlled or BCM controlled ? Do you know what these are ? BCM - body control module , PCM/ECM - engine computer !
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.
Do you know what a park neutral safety switch is ? What do you mean key stuck in ignition ? Can't turn the key to off position , or you can an the key will not come out ?
Your best bet , take it to a qualified repair shop .

Apr 04, 2017 | 2002 Chevrolet TrailBlazer

1 Answer

O5 Colorado got the ecm code when I shut off the truck and now it won't turn over


What ECM code ? What is everything else that is working ? Headlamps , inside lighting , radio etc... When you turn the key on do the instrument cluster warning lights come on then off a few seconds later ? Anti-theft (security light ) On ? Flashing ? Do you know what all is involved ,or happens when you turn the key to start ?
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.


Verify that no starter relay, immobilizer, or automatic transmission DTCs are set that would cause the PCM to disable starting.
? If the specified DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition ON, observe the scan tool PCM Ignition 1 Signal parameter with a scan tool. The reading should be greater than 10.0 Volts.
? If less than the specified value, test the ETC, PCM 1, and PCM B fuses, the RUN/CRNK relay, and the PCM ignition voltage circuits for an open/high resistance. If the circuits test normal, replace the PCM.
Ignition OFF, remove the START relay.
Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
? If the test lamp does not illuminate, test the START fuse and the B+ circuit for an open/high resistance.
Ignition ON, transmission in Park or clutch pedal pressed, verify that a test lamp illuminates between the PNP/clutch start switch signal circuit terminal 86 and ground.
? If the test lamp does not illuminate, test the IGN fuse, RUN/CRANK relay, PNP/clutch switch ignition voltage circuit, and the signal circuit for a short to ground or an open/high resistance. If the circuits test normal, test or replace the PNP switch or the clutch start switch.
Connect a test lamp between the park/neutral signal circuit terminal 86 and the relay coil control circuit terminal 85.
Ignition ON, transmission in Park, or clutch pedal pressed, turn the ignition switch between the START and RUN positions. The test lamp should turn ON and OFF when changing between the commanded states.
? If the test lamp is always ON, test the relay control circuit for a short to ground. If the circuit tests normal, replace the PCM.
? If the test lamp is always OFF, test the relay control circuit for a short to voltage or an open/high resistance. Test the PNP/clutch start switch signal circuit for an open/high resistance. If the circuits test normal, replace the PCM.
Install the START relay.
Connect a test lamp between the starter solenoid terminal and ground.

Mar 12, 2017 | Cars & Trucks

2 Answers

2002 town and country will not start intermittently. Been checked out at garage. Say they cannot find anything. Most times when try to start all warning lights come on.


Will not start how intermittently ? The engine won't turn over or engine does turn but won't start . Starter relay , lose connection . Checking power an grounds would be the first place to start , voltage drop test the main electrical circuits . Voltage Drop Testing the Starter

The starter circuit control is achieved by the starter motor relay ! It is located in the under hood fuse/ relay box or as Chrysler calls it ,integrated power module ! If you pull out the relay an look on the bottom where the pins stick out you will see four sets of numbers .30,87 an 85,86 ! 30 is B+ voltage . 87 is to the starter solenoid . If you jumped those two spots where the relay plugs into the starter would crank the engine over . The last two 85 an 86 are the control side .If you checked with a volt meter where 86 plugged into ,with key on it would show B+ voltage . The last pin is from the PCM - engine computer . When turning the key to start a signal is sent to the PCM to let it know crank has been requested , in return the PCM supplies a ground to pin 85 energizing the starter motor relay sending B+ voltage to the starter motor cranking over the engine . Here is another video on test from the relay base (where relay plugs into ) This is for a horn circuit but same thing . VEHICLE RELAYS Testing from the relay base The relay could be going bad , you never know .Replacing the relay mite not be a bad idea . Good luck , hope this helps !

Jul 23, 2016 | 2002 Chrysler Town & Country

1 Answer

How do i fix crank but no start?


Usually a new computer has to be programmed. Was the computer programmed?
Voltage to the load and control side of asd relay, is hot all the time. The computer grounds the control side of asd relay for it to energize.
The code is for idle air system, the computer controls that wiring circuit.

Jan 13, 2016 | 2001 Dodge Neon

1 Answer

03 Saturn ion brake lights won't go off and sumtimes engine want start and sumtimes it start run 5 secondsand quit


Hi Travis , lets see if we can help you ! First off here is a description of how the brake light circuit works , you need a good understanding of how it works before you can fix it.
Stop Lamps
The 15-amp STOP fuse located in the body control module (BCM) supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both left and right stop lamp assemblies and the center high mounted stop lamp (CHMSL), through the BCM. The stop lamps are grounded at G401 and G403.
Do you know what a BCM is ? The body control module ! An electronic module .Just like the PCM/ECM - engine computer but for the body thing's ,light's , anti-theft system ,power door lock etc..
The body control module (BCM) has a bussed electrical center integrated into the housing. Body control relays and fuses are installed directly on the BCM which simplifies wiring and junction blocks on the vehicle. The body control system consists of the BCM and its associated controls. Battery positive voltage is provided to the BCM from the instrument panel (I/P) BATT 2 fuse in the Underhood fuse block. The module grounds are wired to ground G201 and G301. The BCM is wired to the Class 2 serial data communication bus as well as discrete input and output terminals to control the functions of the vehicles body .
With starting problems an the brake lights problem you may have a BCM problem , could have DTC's - diagnostic trouble codes stored in the BCM . This would have to be checked at a GM dealer or some other independent repair shop with a professional grade scan tool .
The ignition switch is an input to the BCM , when it receives a start input the BCM energizes the run / crank relay an other things !
Relay Controlled Power Mode
The BCM uses the discrete ignition switch inputs Off/Run/Crank, Accessory and Run/Crank to distinguish the correct power mode. These circuits are also routed to the Run/Crank and Accessory relays for relay controlled power feeds during the appropriate power mode.
Run/Crank Relay The relay uses a Hot At All Times B+ power source derived from the underhood electrical center. The Run/Crank relay supplies a power signal to the following circuits when the a Run or Crank power mode is selected:
?€¢
Backup lamp circuit


?€¢
Electronic brake control module (EBCM)


?€¢
Engine control module (ECM)


?€¢
Ignition control module (ICM)


?€¢
Park neutral position switch


?€¢
Transmission circuit 1 and 2


This is not something for a do it yourselfer , this is dealer or like I said a independent ASE certified repair shop .

Nov 24, 2015 | Saturn Cars & Trucks

1 Answer

2003 chevy silverado 5.3 will crank but not start and has no power to the pcm1 fuse


What make vehicle ? You need to find a power distribution chart an see where that fuse gets it power . Some vehicles have a relay that powers up the vehicle . ford has power hold relay , gm on some models has a run / crank relay , Chrysler has ASD - auto shut down relay , Asian vehicles have a main relay etc... But as long as there is no power to the PCM it's not going to start !

Sep 10, 2015 | Cars & Trucks

1 Answer

Wont start the starter is working yet it won crank what can I do


Did you check power an grounds using voltage drop testing , did you check battery voltage an computer control at the starter motor relay in the under hood fuse / relay box ? Instead of guessing you need to learn how to use a DVOM - digital volt ohm meter an test ! The powertrain control module controls the starter motor operation ! Starter Voltage Drop VEHICLE RELAYS Operation Diagnosis ,If you pull the relay an jump pin's 30 & 87 the starter should crank ,test the circuit starter motor side ! Pins 85 & 86 are the control side ., Pin 85 or 86 forget which one has battery voltage with the key on . The one with out voltage is control from the engine computer ! Also if the anti theft system is active it wont start !

Aug 25, 2015 | 2005 Chrysler Pacifica

2 Answers

2000 Kia Sportage ECM ECU Bad?


Check the pcm ground pins to make sure they are grounded. 6, 28, 34, and 55.


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Jul 23, 2017 | 2000 Kia Sportage

1 Answer

Fuel pump cuts in but car wont start


If you have to force the fuel pump on by the relay who is controling ignition? The fuel pump will come on thru the main relay which is next to the fuel pump relay this controls ignition,go back to the begining,on one of the coil leave a 1/4 between the sparkplugwire and the coil crank the engine there should be spark is there is no spark correct for spark and fuel will return when the ECM see a valid RPM signal.so test for spark first. The Main relay is what needs to be look at

Mar 20, 2012 | Cars & Trucks

2 Answers

2001 blazer wont crank, headlights come on when key is off,can get truck to run after taking cover of starter relay,and fuelpump relay turn key on, and manually push relays to start.


At the moment, I'm only talking about starter relay. The starter relay has two sides, the load side and control side. The load side is that line with arrow, terminal 30 and 87, terminal 30 is hot all the time, plus, see that fuse on the load side. If you unplug the starter relay, key in the on position, on position is where dash lites come on, Then use jumper wire between terminals 30 and 87, at the least it should crank the starter motor and it might start. If you try that, make sure tranny is in park or neutral and parking brake is set.
If you get a reaction, the problem should be on control side of starter relay, right side in the picture. Terminal 85 and 86, the control side needs voltage and ground. You can see crank fuse, goes hot with key in the crank position, not only check fuse check for voltage on fuse circuit. As you can see, on the control side the neutral or clutch switch, depending on the tranny, is involved The ground for the control side is a chassis ground. As far as the fuel pump, other than the initial prime, fuel pump will not run w/o rpm signal, you have to crank it to get rpm signal.
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Jun 30, 2017 | 2001 Chevrolet Blazer

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