Question about 1999 Jeep Grand Cherokee

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Radiator fan relay control circuit failure,fan is good and relay is good,what now?

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You mentioned that the fan and the relay is good. Then, you may need to check the wiring. Here's how:

The relay is activated by light green/dark blue wire between it and the pin 73 on the 41-80 plug. The black wire at the relay is a ground, and the gray wire is the 12V supply from fuse 24 in the power distribution center under the hood and it should be present all the time direct from the battery. These relays seem to be prone to failure. In fact you might check with the dealer to see if you can get one free under a recall.

Have a good day ahead!


Posted on Jun 23, 2009

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1 Answer

1999 Dodge Neon Issues (HELP)


Here's a link to the P0340 code,and P1491.Powertrain Diagnostics Manual P-1491 Radiator Fan control relay circuit
Set condition: An open or shorted condition is detected in the radiator fan relay control circuit.

Possibilities:
Fan relay ground circuit open
Fused B+ circuit open
Rad fan control relay defective
RF relay output circuit volt cycles over to batt voltage
RF relay control circuit open
RF relay ctrl rly ckt wir harness observable or intermittant defect
RF relay ctrl ckt short to ground
Defective PCM

Get out your Multimeter.

Mar 22, 2013 | 1999 Dodge Neon

1 Answer

1999 Jeep Cherokee Sport wont shift into overdrive P1491


P1491 - Radiator Fan Control Relay Circuit Open Or Shorted

When monitored: with the ignition key on, battery voltage greater than 10.0 volts and
the pcm requests the radiator fan to be turned on.
Set condition: an open or shorted circuit is detected in the radiator fan relay control
circuit.

Possible causes
radiator fan ctrl rly circuit wire harn intermittent defect
radiator fan ctrl rly circuit wire harn observable defect
radiator fan relay ground circuit open
rad fan relay control circuit open
radiator fan relay control circuit short to ground
rad fan control relay defective
pcm defective

Check ot and keep us updared.

Oct 15, 2011 | 1999 Jeep Cherokee

1 Answer

Have two codes 1490 and 1489 what are they and how do i fix them


It's most likely low speed fan control relay circuit trouble.
There are separate relays and control circuits for high and low speed for the fans. This way if one messes up the other one should still work. Relays are in relay/fuse block under the hood. There is a diagram under the relay box cover that shows the function of each relay. The relays just plug in.

1489 = High Speed Fan CTRL Relay Circuit - An open or shorted condition detected in the control
circuit of the high speed radiator fan control relay.

1490 = Low Speed Fan CTRL Relay Circuit - An open or shorted condition detected in control circuit of
the low speed radiator fan control relay.

Either the relays are gone or the connector isn't plugged in, probably the connector if both the low and high circuit is out.

May 06, 2011 | 1998 Dodge Intrepid

4 Answers

What does the diagnostic test code P1491 means?


Hello jhonney21,

The P1491 is Radiator fan control relay circuit code. It is set if an open or short circuit is detected in the radiator fan relay control circuit.

Regards,
netvan

Feb 25, 2011 | 2001 Chrysler Voyager

2 Answers

I was in a minor fender bender ( bumped the car in front of me and did little cosmotic damage.) After that my check engine light came on. The code is P1491 Manufacturer Control Axillary Emissions...


The DTC (Data Trouble Code) P1491 for Chrysler-Jeep is for the Radiator Fan Control Relay Circuit, and the radiator fan control relay is located between the radiator and the AC condenser, and there is the possibility that a collision could have damaged the radiator control relay or the wiring. Here is an image of a chrysler radiator control relay to help assist you.




zaraki_31.jpg

Nov 28, 2010 | 2003 Chrysler Town & Country

2 Answers

P1491 diagnostics code for 2003 Jeep Grand Cherokee



Trouble Code: P1491 You PCM does not sense current to radiator fan when it turns it on. Is the fan coming on or not? Usually not when you have this code. Problem can be with the fuse, relay, wiring or fan itself. First check the fuse. If good, next try swapping the relay with another one in the engine compartment relay box, such as the horn relay.
Let the car warm up and see if the fan will come on. If yes, get a new relay. If not, either use a test light to see if there is voltage at the fan connector when the engine is on and hot, or else test the fan motor by hotwiring it to the battery. If none of this works, please get back to me for how to troubleshoot the wiring.


Radiator Fan Control Relay Circuit Malfunction
Possible Causes:


Radiator fan control relay circuit is open or shorted to ground Radiator fan control relay circuit is open (test power to IGN) Radiator fan control relay is damaged or has failed PCM has failed

Nov 10, 2010 | 2003 Jeep Grand Cherokee

1 Answer

Where could I find a list of Fault Codes for my 3.3 Litre Voyager?


CHRYSLER OBDII DTC

P1101 HCM/PCM Communication Performance

P1103 Turbocharger Waste Gate Actuator Malfunction

P1104 Turbocharger Waste Gate Solenoid Malfunction

P1105 Fuel Pressure Solenoid Malfunction

P1195 Slow Switching O2 Sensor Bank One Sensor One During catalyst monitoring

P1196 Slow Switching O2 Sensor Bank two Sensor one During catalyst monitoring

P1197 Slow Switching O2 Sensor Bank One Sensor two During catalyst monitoring

P1198 Radiator Temperature Sensor Input voltage too high

P1199 Radiator Temperature Sensor Input voltage too low

P1281 Engine is cold too long

P1282 Fuel Pump Relay control circuit

P1283 Idle select signal invalid

P1284 Fuel Injection pump battery voltage sensor out of range

P1285 Fuel Injection pump controller always on

P1286 Accelerator Position Sensor (APPS) supply voltage too high

P1287 Fuel Injection pump Controller Supply voltage low

P1288 Intake manifold short runner tuning valve solenoid circuit

P1289 Manifold tune valve solenoid circuit

P1290 CNG Fuel system pressure too high

P1291 No Temp rise seen from intake heaters

P1292 CNG Pressure sensor voltage too high

P1293 CNG Pressure sensor voltage too low

P1294 Target idle not reached

P1295 No 5 volts to TP sensor

P1296 No 5 volts to MAP sensor

P1297 No change in MAP sensor from start to run

P1298 lean operation at wide open throttle

P1299 Vacuum Leak detected (IAC fully seated)

P1300 Ignition timing adjustment circuit failure

P1388 Auto shutdown relay control circuit

P1389 No ASD relay output voltage at PCM

P1390 Timing belt skipped one tooth or more

P1391 Intermittent loss of CMP or CKP

P1398 Mis-Fire Adaptive Numerator at Limit (PCM is unable to learn the crank sensors signal

for use in preparation for misfire diagnostics

P1399 Wait to start lamp circuit

P1403 No 5 volt feed to EGR

P1475 Auxiliary 5 volt supply is too high

P1476 Too little secondary air

P1477 Too much secondary air

P1478 Battery Temp Sensor Volts out of limit

P1479 Transmission Fan Relay Circuit

P1480 PCV Solenoid Circuit

P1481 EATX (Electronic Automatic Transaxle) RPM pulse generator performance

P1482 Catalyst Temperature Sensor Circuit shorted low

P1483 Catalyst Temperature Sensor Circuit shorted high

P1484 Catalytic Converter overheat detected

P1485 Air injection solenoid circuit

P1486 EVAP Leak Monitor found a pinched hose

P1487 Hi Speed Fan #2 Circuit

P1488 Auxiliary 5 volt supply output is too low

P1489 High speed fan control relay circuit

P1490 Low speed fan control relay circuit

P1491 Radiator fan relay control circuit

P1492 Ambient/ Battery Temp sensor input voltage too high

P1493 Ambient/ Battery Temp sensor input voltage too low

P1494 Leak detection pump pressure switch or mechanical fault

P1495 Leak detection pump solenoid circuit

P1496 5 volt supply, output too low

P1498 High speed radiator fan ground control relay circuit

P1500 General alternator 'FR' Terminal circuit fault

P1594 Charging system voltage too high

P1595 Speed control solenoid circuits

P1596 Speed control switch always high

P1597 Speed control switch always low

P1598 A/C pressure sensor input voltage too high

P1599 A/C pressure sensor input voltage too low

P1680 Clutch released switch circuit

P1681 No I/P Cluster CCD/ J1850 messages received

P1682 Charging system voltage too low

P1683 Speed control servo power control circuit

P1684 The battery has been disconnected within the last 50 starts

P1685 The SKIM (Smart Key Immobilizer Module) has received an invalid key

P1686 No SKIM (Smart Key Immobilizer Module) bus message received

P1687 No Mechanical Instrument cluster bus message

P1688 Internal Fuel injection pump controller failure

P1689 No communication between the ECM and injection pump module

P1690 Fuel injection pump CKP sensor does not agree with the ECM CKP sensor

P1691 Fuel injection pump controller calibration error

P1692 Fault in companion Engine control module

P1693 A companion DTC was set in both the ECM and PCM

P1694 No CCD message from PCM- Aisin transmission

P1695 No CCD message from body control module

P1696 PCM failure EEPROM write denied

P1697 PCM Failure SRI (Service Reminder Indicator) mileage not stored

P1698 No CCD message from TCM

P1719 Skip shift solenoid circuit

P1740 TCC solenoid or overdrive solenoid performance

P1756 Governor pressure not equal to target at 15-20 psi

P1757 Governor pressure is above 3 PSI when 0 PSI is requested

P1762 Governor pressure sensor offset improper voltage

P1763 Governor pressure sensor voltage to high

P1764 Governor pressure sensor voltage to low
P1765 Transmission 12 volt supply relay control circuit

Oct 03, 2010 | 1998 Plymouth Voyager

2 Answers

Check Engine Light


It is for the radiator fan relay control circuit.It means there is a problem in the cooling fan relay circuit.Could be the relay,wiring,or the fans.Check the fuses and relay over if it looks good then you have to take it in to get it diagnosed.You need a scan tool and you also need to know how to use a multimeter.Hope this helps.Good luck.

Feb 24, 2010 | 2000 Dodge Caravan

1 Answer

Location for radiator fan control relay circuit for 1999 Grand Cherokke Laredo.


This relay is a common problem for Chrysler vehicles. Located in the passenger side bumper area (Jeeps). Test the fan first.

Hope helped (remember rated ths help) Good luck.

Nov 04, 2009 | 1999 Jeep Grand Cherokee

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