Question about 2000 Dodge Caravan

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Starting problems. when you try to start the engine, the relays click, we changed the pcm, the starter.some times it start, other days it wont

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Ground wire corrotion

Posted on Jun 12, 2008

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Posted on Jan 02, 2017

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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

1 Answer

2001 Cadillac DTS wont start or turn over


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 .

Jan 01, 2017 | Cadillac Cars & Trucks

2 Answers

I have a 2002 isuzu axiom, all it does is click once when you turn the key. So i replaced the starter, same thing. It has an alarm system it should be factory. Will that make my car not start


make sure the battery posts and terminals are shiny clean and the battery is fully charged , check there is battery voltage at the big starter terminal with the starter switch engaged, if voltage is ok starter at fault , no voltage solenoid or switch at fault.

Nov 12, 2016 | 2002 Isuzu Axiom

1 Answer

No start, no click,


What make , model an year vehicle ? Jumping poles on solenoid , or the starter relay in the fuse / relay box ? If relay ,it's most of the time energized by the PCM - engine computer .

Dec 05, 2015 | Cars & Trucks

1 Answer

Aurora 4.0 im stumped checked starer relay and car still wont start clicking ssound comin from backseat jumped it whats wrong


What year vehicle ? The clicking sound you hear from bake seat is probably a relay ! There is a fuse / relay box under the back seat ! How did you check the starter relay ? Just pull it out an look at it ? Was it #36 START 1 Relay
-- Starter Solenoid and PCM in the under hood fuse / relay Box ?
This relay is computer energized - PCM supply's a ground to circuit 447 which energizes the relay sending voltage to the starter S terminal engaging the starter . Do you have a test light or a volt ohm meter ? If you pull out the starter relay an look on the bottom you will see some numbers , 85,86 an 30,87 . match them up to the holes they came out of . Check out this video on YouTube ,you can check for voltage an computer control . Is the SECRUITY light lit on the dash ?
This VEHICLE RELAYS Operation Diagnosis VEHICLE RELAYS Testing from the relay base

Aug 11, 2015 | Oldsmobile Aurora Cars & Trucks

1 Answer

My 1997 park avenue is stalling. When it does the gages tweek out. The break instantly locks up. And now it wont start nor even turn over. Idk. But I need a lead


There are very specific diagnostic steps to follow when diagnosing problems on vehicles like yours ! An using a professional grade scan tool is key , because it will communicate with all modules on the vehicle ! A shorted module or a serial data bus malfunction will cause a no start , no crank problem !
The PCM has the ability to disable starter operation if conditions inappropriate for starter operation exist. The PCM disables the starter if the engine is running, if a correct VTD password is not received from the PASS-Key?® III module or if the vehicle operator attempts to engage the starter for an extended period of time.
The PCM controlled starter system consists of the following components:
?€¢
Starter enable relay #1.


?€¢
Starter enable relay #2.


?€¢
The park neutral position switch.


?€¢
The ignition switch.


?€¢
The starter solenoid.


?€¢
The PCM.


Is there a SECURITY light lit on the dash ? Your best bet is take to a ASE certified repair facility !

Jun 20, 2015 | Cars & Trucks

1 Answer

08 Chevy Cobalt wont start. Battery is good.?


Is there a warning light , padlock an car symbol lit when it won't start ? I assume it has to be a bad starter? Every time i jump the car it starts up fine.??? It wouldn't be a starter then ! Have the charging system check out . Have a voltage drop test on the starter circuit done . Test from the starter relay . check out videos on youtube , but don't assume anything . Test , Test Test .

https://www.youtube.com/watch?v=WMXENKujYtc&t=6s

Starter Voltage Drop

VEHICLE RELAYS Testing from the relay base

Plus you need to know how the starter system works for the vehicle your trying to diagnose . I 'am a GM tech , Chevy , Cadillac , buick , GMC. Have access to GM factory repair info. Been to a lot of GM training school's . The computers on this vehicle have a lot to do with the starting of the vehicle ,PCM - engine computer , the ignition switch is a low voltage input to the BCM - body control module , which will send a message over the GMLAN serial data communication network to the PCM to energize the starter relay or crank relay .The PCM also has to see a voltage input coming from the transmission range selector switch , showing it's in park or neutral , has to have correct fuel enable password from the theft module etc...
Also it take's is a little corrosion , lose connetion , lower then normal circuit voltage for problem to happen .
Factory service repair manual discription

Moving the ignition switch to the start position signals the body control module (BCM) through discrete inputs from the ignition transducer that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the engine control module (ECM) requesting engine start. The ECM receives a ground signal from the park/neutral position (PNP) switch or a signal from the clutch pedal position sensor notifying that it is safe to start the engine. Ground G105 supplies ground for the CRNK relay coil. The starter relay coil control circuit is then supplied voltage by the ECM closing the switch in the starter relay suppling 12 volts from the CRNK fuse to terminal A of the starter. Ground is supplied to the starter solenoid through the engine block.

The first step in diagnosing a problem like this , hooking up factory scan tool , checking for DTC'S - diagnostic trouble code's , checking inputs to control modules that are in charge of starting the vehicle .

Testing an knowledge is the way to a fix , an testing cost $$$$$


Mar 19, 2017 | 2008 Chevrolet Cobalt

1 Answer

1999 tahoe will not crank with ignition key


it sounds like the problem but the question is why wont the pcm start the car. with the key turned to on the service engine light sould be on. if not the pcm has no power.

Dec 31, 2009 | 1999 Chevrolet Tahoe

1 Answer

2003 Caravan No Crank, 3.3L


This is a bad PCM. Try to disconnect the security system first and if it still does not start then it is the PCM.

Aug 09, 2008 | 2003 Dodge Caravan

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