Question about 1997 Dodge Caravan

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Alternator has high voltage and not chargeing battery

Is there possibly a fuse relay I am not seeing that goes to the alt. cause I can't seem to find anything between it and the PCM

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  • mnabi01
    mnabi01 May 11, 2010

    you mentioned that alternator over charging or not charging.?what do you mean but high voltage not charging?

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Look if You start the car and wile car running idling, disconnect the positive terminal on the battery and the engine stops, You need a New Alternator, look on the fuse box on the engine compartment for a fuse or a Relay with the alternator name, the main fuse is bolted to the fuse box, but I doubt is a fuse

Posted on Jan 21, 2009

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My 2007 f150 will not crank over I hear the relay click but there seems to be no power going to the solenoid. I replaced the relay and it started about 30 times now same prob any advice


What relay did you replace ? Starter relay ? Removing the relay you may have changed connector position in the fuse / relay box where the relay plugs into . Wiggle the relay see if that does anything . At the relay base jump pin's 30 & 87 with jumper wire , it should crank the engine over . If you look on the bottom of the relay you will see 4 set's of numbers 30 & 87 are load side of the relay . If you were to test with a voltmeter ,pin 30 would have Battery voltage ,Pin 87 goes to the S terminal on the starter solenoid . Pins 85 & 86 are the control side .When you turn the key to start B+ voltage goes through the run / start diode ,located in the AUX relay box 1 through the digital transmission range sensor to pin 86 of the starter relay ,pin 85 goes to the PCM .Where the PCM supply's a ground energizing the starter relay closing the contacts inside sending B+ voltage to the starter solenoid S terminal . Do you have a automatic trans or manuel ? Move gear selector to neutral , check out wiring diagram here http://www.bbbind.com/free_tsb.html Watch videos on youtube for basic electrical testing , voltage drop testing etc.... How to test a relay . Test the circuit ! How to voltage drop test starter motor circuit

Jan 21, 2017 | 2007 Ford F-150

1 Answer

AC of my 2003, 2.7lt CRD, Jeep Grand Cherokee, has recently been re gassed, it cools ok initially but for 5 to 10 minutes only, error codes 22 and 52 indicated.


its not one fuse, sorry, not at all
and you failed to scan the PCM, why skip this? it tells you whats UP.
only 2 things cause that (electronics logic)
1: The hi/low pressure switch tripped,
2: or the AMP the AC logic module (has bad inputs)
is this is USA car, ? seems not. but is it?
as non usa cars are different.
ill now answer, as if it was....
our cars have 2 HVAC systems (chapter 24 in Serv. manual.)
manual or AZC, no photos of your controls, so will toss coin on AZC auto zone controls (see Display there with graphics and temp, mine shows, 74F like the books shows. and 4 knobs not 3.?
The AXC system has operator self diagnostic mode,
need that, its in the manual, see last link below,a free book.

fuse JB20 run this controller. but only on gas engines.
as does, JB F21 and PDC fuse 21. (you 2 fuse both 21)
JB is cab box, PDC is hood fuse box next to clutch RELAY.
That logic resides, in the AZC and the PCM
the PCM runs the clutch relay directly
the diesel uses different wiring and fuses.
PDC Fuse 16 and F21 are diesel , fuse for the clutch.
i suspect you failed to check all fuses.
lets do the flow of logic, and you will see.
you have the A/C turn on via the AZC controls.
it sees its (guess) its too hot in the cab
the AZC then sends a MESSAGE down the network.
the PCM sees that and the BCM,
the PCM if the engine is not overheated and the hi/low switch is not tripped, (called by jeep pressure transducer A/C)
then the PCM energizes the clutch relay.
The BCM helps with directing traffic. (bcm prevent evap freeze up etc....)

so there are 3 things you can do.
1: this time check all fuses, not just the one, (RTM read the manual for our car in your country)
2: scan the PCM for A/C errors. (posted now over 1000 times)
3: run the AZC if opted day 1, self test, and the 50 errors possible there. chapter 24.

click WJ jeep, here, read chapter 24
then 8w wiring chapter on A/c
and keep in mind there are systems, manual and AZC
and they are NOT the same.

all free, USA only this is a USA forum not say Europe.

http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service

Dec 28, 2016 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Blown fuse pcm


It is possible that the fuel relay is faulty and causing excessive current through the pcm fuse which is blowing because of the excessive current draw to the relay.

Mar 28, 2014 | 2003 Chevrolet Avalanche

1 Answer

Charging system voltage low


there are only 3 parts. but the causes are 25 or more.
1: belt missing slipping,
2: engine rpm below 800 RPM (lots of ways ,ask )
3: ALT had.
4: wiring to ALT bad.
5: bad battery or its connections, (wires)
6: bad fuse. see fuse link a11? on fFM page 20?
7: car is PCM alt controlled, it can be bad too. see 2 field wires on ALT and PCM on page 20? below?
8: battery temp sensor bad. making PCM think battery overheats.
the fSM covers all tests above.

pick car here, then pick charging.
5 alternators used on the 5 diffr.engines. got the wrong one?

the see wiring diagrams at end and chapter 20 inside, charge.
pdf page 118 for gas engine, if diesel next few.

Jan 07, 2014 | 1998 Jeep Cherokee

1 Answer

Not able to communicate with PCM with diagnostic scanner


did you really check all fuses. (using an ohmmeter)
what engine, I4 or V6?????
are you posting to someone elses PCM Com problem or what?
is this just and alternator issue , how confusing can this be....
PCM> coms. fails.
3 possible.
1: pin 16 in the OBD2 conn, is not 12vdc. blown fuse. (use a voltmeter)
2: wrong scan tool old tool , on modern CAN buss car will fail. 100%
dead. (open SCAN tool book read if it supports CAN buss)
3: Dead PCM or id bet its , a fuse blown to it.

now i do ALT.
18v is bad. (using a quality DMM or radio shack 1960 meter?)
it means the ALT regulator OUT of CONTROL. ( or bad wiring to it)
changed what?, alt is new, used, rebuilt, barrowed? what.?
This car , im looking it up now, at alldata.com so could you,
or the FSM.

this ALT has a regulator, but is just a slave to the PCM.
in that the PCM controls the REG with 3 wires.
the diagnosis is not easy , i recommend, the FSM
it covers all steps., in the diagnosis,

top fail reasons.
1: bad fuses.
2: bad wiring and connections. (see schematic)
3: bad battery (not you) (open cells cause REG to shut down. )
4: bad ALT. (i say a fella change alt 5 times, and skipped #2)
5: bad PCM. (last, , show me that tests, in FSM)

all that and tons more in the FSM. read it.


or log in to alldata.com and read the Charging pages.

Jan 03, 2014 | 2009 Honda Accord LX

1 Answer

Fuse number eleven keeps blowing on 1998 lincoln conttenial what works that fuse


The equipment connected with this fuse is listed as the Ignition coils, the radio interference capacitor, the PCM relay and the passive Anti-theft System Module.

I think I would replace the PCM relay as it is the only part listed which has moving parts inside. In addition, you can check if the PCM relay is the same part as the Horn relay and use the horn relay in place of the former PCM relay. If your short goes away, then you know the old PCM relay was bad.

If the fuse breaks before you crank the engine, you could disconnect the coils and see if the fuse still breaks.

The radio capacitor, you need a little better diagram to identify this wire and when disconnected, you would know if the fuse breaks or not.

If its the anti-theft, then that is more complicated to solve. Test all the other stuff first.

Please let me know what you find.

Dec 18, 2013 | 1998 Lincoln Continental

1 Answer

Loss of power


stock car YJ ? , or all hacked up. (old cars get hacked)
2.5 or 4.0 liter engine? still have a real jeep alternator not upgraded?

loss of electrical power (first rule, we never need to guess.!!!)
not with a voltmeter. (tool that costs $20 )
alternator good (by what means, autozoned?) ( we can find out one car)
but low on gauge. what gauge in dash voltmeter.? sure...
i think you car has no charge lamp only the dash VM.

own an volt meter? a DMM? hand volt meter?

1: if the alternator charge lamp is stuck on driving.
2: is battery voltage at 13.3 to 15vdc with engine at 800 RPM idling
alternator belt not slipping, for sure.....???
if the battery voltage is near 12.5v and falling running that is
an Alternator system failure, note i said, system. !!!

this is first. if we get to here. we can find the real cause.
test 3:
is the charge lamp on keyon, and goes out running?
make sure the big fuse for the alternator in the engine bay fuse
box is not blown, 50amp?

I have no 95 FSM and my online source sucks for 95

Alternator dead: (alt good)
1: belt slipping . engine at 300rpm, nah.
2: fuse blown, the big one. (engine bay fuse box)
3: ;wrong alternator, there are many, most others will fail, even good ones.......
4: alternator ground bad. (end to end, to battery minus)
5: bad wiring to same. bad connections, any to battery or alt.
6: some jeeps the PCM has the field regulator, see link below.
ECU pin 20 , is field pin, it is on 95, 4.0L (engine not stated)

is the CEL lamp on, and throwing code 41 DTC?, alt, field errors?

the alt has 4 pins, battery, field,ground and voltage sense.
The reg is in the PCM. and if bad is a bad $3 transistor..
see same form for fix for that issue..

i think this is same as your. 1996 is big change year.
http://www.jeepforum.com/forum/f12/1993-wrangler-pcm-ecu-ecm-pin-out-diagram-1170004/


you can test the alt, PCM wire pulled !, by full fielding the alt.
grounding the field term, no wires on field pin of alt.
see FSM for details on that.
The PCM modulates the field pin to control charge at all times.

Dec 17, 2013 | 1995 Jeep Wrangler

1 Answer

I have a 2001 nissan sentra that the battery tests good, alternator tests good, but will only run for about 20 minutes then slowly dies and the battery has to be recharged, any ideas on the problem?


if alternator and belt are ok, then check the ground for the neagative on batteryor the cable end itself. car running accessories off, then you should have at least 13.5-14.5 at battery! if less then 13 volts with everything off. then alt, or wiring is the problem. make sure battery terminals are clean and tight at battery. take negative cable off battery while its running. if it quits its a bad alternator, if it stays running alt, is ok. check all the fuses and relays, just to be sure. if you think you have a drain on battery. remove fuses and relays one at a time, until you find the one curcuit thats causing the drain. then replace that fuse or relay. do not pull the pcm fuse or other kam-sensitive modules until you have checked the other curcuits. if the pcm is not getting proper voltage, it will die out ! battery could be weak! battery voltage by itself should be at least 12.68 volts this is at 100%. good-day !

Sep 26, 2011 | 2001 Nissan Sentra

2 Answers

What does the code p0442,p0456,p0700,p0645,p0481,p0340


CODE PO442 - EVAP SMALL LEAKED DETECTED. CODE PO456 - LEAK IN EVAP SYSTEM DETECTED. POSSIBLE CAUSES / VACUUM HOSE CONNECTIONS OR SWITCHES HAVE COME LOOSE OR MALFUNCTION / EVAP EMISSION SYSTEM HAS A LEAK / EVAP PURGE SOLENOID OPERATION HAS MALFUNCTION / NVLD SWITCH OPERATION HAS MALFUNCTION / CODE PO 700 - AUTOMATIC TRANSMISSION FAULT DETECTED .POSSIBLE CAUSE TRANSMISSION CONTROL MODULE RELATED SENSOR HAS SOLENOID IS DAMAGED OR HAS FAILED.TRANSMISSION CONTROL MODULE FAILED OR POWER CONTROL MODULE HAS FAILED.YOU TAKE VECHICLE TO DEALERSHIP THEY WILL TO SCAN TRANSMISSION. CODE PO645 - AC CLUTCH RELAY CIRCUIT MALFUNCTION . POSSIBLE CAUSE.INTERNALLY FUSED IGNITION SWITCH OUTPUT CIRCUIT IS FAULTY. AC RELAY CLUTCH CONTROL CIRCUIT IS OPEN OR IT IS SHORTED TO GROUND. AC RELAY CLUTCH POWER SUPPLY FUSED IGNITION CIRCUIT IS OPEN. AC RELAY IS DAMAGED OR IT HAS FAILED.PCM HAS FAILED. CODE PO481 - HIGH SPEED NUMBER 2 FAN RELAY CONTROL CIRCUIT. POSSIBLE CAUSE HI FAN RELAY POWER CIRCUIT IS OPEN FROM THE RELAY TO FUSED POWER.HI FAN CONTROL CIRCUIT IS OPEN OR SHORTED TO CHASIS GROUND. FAN RELAYS FAILED. PCM HAS FAILED. CODE PO340 - NO CAMSHAFT POSITION SENSOR CIRCUIT FAILURE. POSSIBLE CAUSE CMP SENSOR CONNECTOR IS DAMAGED OPEN OR IT IS SHORTED. CMP SENSOR SIGNAL CIRCUIT IS OPEN OR SHORTED TO GROUND OR TO BATTERY VOLTAGE OR 5 VOLT SUPPLY CIRCUIT. CMP SENSOR 5 VOLT SUPPLY CIRCUIT IS OPEN OR SHORTED TO GROND OR TO BATTERY VOLTAGE. CMP SENSOR GROUND CIRCUIT IS OPEN. CKP SENSOR IS DAMAGED OR HAS FAILED.PCM HAS FAILED. SOUND LIKE PROBLEM IS PCM GROUND WIRE BROKEN OR LOOSE OR PCM HAS FAILED.

Nov 16, 2010 | 2004 Dodge Intrepid

2 Answers

P1211 and P0603 codes have come on after installing superchip


Hi,

For P1211 :-

This code means the ICP pressure is aove or below specs meaing there is a high pressure oil concern. You need to monitor the ICP with a scan tool and see which it is. If its high then its most likely a faulty IPR valve. If its low then its most likely a internal leak at the pump or stand pipes.

For P0603 :-

The code P0603 is in ost case set due to the performance chip.
If equipped, remove and recheck operation.

If the vehicle is not equipped with a chip, or removing it makes no difference, monitor the voltage on fuse #22 in the interior fuse panel to see if the battery voltage goes away when the problem occurs.

If the voltage on fuse #22 is dropping or going away, check for a loose terminal connection on the PCM power relay. Also try swapping the PCM power relay with a similar part to eliminate a faulty relay.

If the relay is OK, but the voltage on fuse 22 is dropping, suspect an internal problem with the interior fuse panel.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Sep 18, 2009 | 2000 Ford F250 Super Duty Crew Cabs

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