What causes a Code P1494 on a 2004 Jeep Grand Cherokee Straight 6 40 liter?

Answer 1

The code refers to the leak detection pump that is part of the gasoline vapor control system which is for pollution minimization. It says either that the pump switch or mechanical operation is faulty. You would find the pump, probably on the underside of the vehicle by tracing the hoses related to the vapor recovery tank that may be in the right front corner of the engine compartment (I don't know Jeep designs) and then check to see if the pump starts when you turn the ignition to the run position when the vehicle is cold. Then remove the vacuum hose side of the pump and see if it draws a vacuum. If it does, then the vacuum-detecting switch that detects that the pump operation is OK may be faulty. If the pump doesn't start or doesn't draw a vacuum then the power to the pump, the pump itself, or the vacuum line may be leaky. Finally, the powertrain controller could be At Fault. In any case, that is where the issue is, and it should not be a major issue if it is handled by a knowledgeable mechanic.

Answer 2

You have a problem with the EVAP Leak Detection Pump. You must first repair the problem that caused the ECU to set this code. Once the problem is repaired the code can be reset with an OBD2 scanner.

Answer 3

Trouble code P1494 means: Leak detection pump pressure switch or mechanical fault

Answer 4

Trouble code P1491 means: Radiator fan relay control circuit

Answer 5

Trouble code P1130 means: Fuel Rail Pressure Monitoring

Answer 6

P1492

Battery Temperature Sensor Voltage Too High

Try replacing the battery.

Answer 7

That code is a manufactureres code. You can type jeep diagnostic code p1494 into bing or Google and get it to come up for you.

Answer 8

RADIATOR FAN CONTROL RELAY CIRCUIT