Question about 1994 Jaguar XJ6

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Fuel 46 and fuse 46 is the coed i get with vcm. the check engine light came on but it runs and starts great. no other lights have come on. i did look in my manual, but fuse 46 and fuel 46 is not in there. anyone have any ideas?

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  • Christine Perry Mar 15, 2009

    Thank you! I will do that and i do have the raido code.

    Thanks again



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Fuel fail 46 is emission related and if I remember is related to the oxygen sensor/catalyst. I would reset the code by disconnecting the battery for 45 second and if it comes back on then start with a proper diag.
Your welcome to email me with any other issues and if you dont have the radio code

Posted on Mar 11, 2009


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Have a '99 GMC JIMMY. Everything has been replaced. Fuel pump, regulator, fuel pressure is good. Everything is turning over but not starting up. But will if you put starting fluid in it. Any ideas?

It sounds allot like a possible crankshaft or camshaft sensor most likely the camshaft sensor. If you can come up with any sort of scan tool or code reader see is there are any codes in the system. Or there is a problem with the security system possibly a bad key. Here is the cranks but won't run procedure from gm's service manual, ignore the parts about spark pligs wires and distributor those are obviously good if it will fire on starting fluid.
Engine Cranks But Does Not Run Refer to Engine Controls Schematics.
Circuit Description The diagnosis for an engine that cranks but does not run must have three elements present before proceeding with the diagnostic table. The following conditions must exist:
  • The battery must be adequately charged.
  • The engine cranking speed must be sufficient.
  • There must be an adequate amount of fuel in the fuel tank.
Diagnostic Aids If no trouble is found in the fuel pump circuit or the ignition system and the cause of an Engine Cranks But Will Not Run has not been found, check the following conditions:
  • Perform the Fuel Injector Solenoid Coil Test.
  • An after-market vehicle theft deterrent system could cause a start then stall or a no start condition.
  • Fouled spark plugs
  • An EGR valve stuck open
  • Water or foreign material in the fuel system
  • A grounded or intermittently grounded Ignition Control (IC) signal circuit
  • Restricted exhaust system. Refer to Restricted Exhaust System Check
  • Check the following ignition components:
    • Worn distributor cap
    • Worn distributor rotor
    • Check ignition wires by lightly spraying them with water in order to identify intermittent no starts
Check the following mechanical components:
  • Cylinder valve timing
  • Loose or broken timing chain
  • Low compression
  • Worn camshaft lobes
  • Bent or burned intake or exhaust valves
The VCM has integrated circuits that are fault protected; therefore, if a circuit has failed, the integrated circuit may not be damaged. If that is the case, the system will keep the circuit open until the condition has been corrected.
Afterwards, reinstall the VCM and check the circuit. Replace the VCM only if the circuit is still inoperative.
An intermittent may be caused by any of the following conditions:
  • A poor connection
  • Rubbed through wire insulation
  • A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Test Description The numbers below refer to the step numbers on the diagnostic tables.
  1. If the engine starts, the problem could be intermittent. Basic engine mechanical problems, the vehicle theft deterrent (VTD) system (if equipped), and poor connections could cause a no start condition.
  2. This step will determine if the cause of the no start or start and stall is related to the VTD.
  3. If the signal is over 2.5?volts, the engine may be in the clear flood mode which will cause starting problems.
  4. If the engine coolant sensor is below -30°C (?22°F), the VCM provides fuel for this extremely cold temperature which will severely flood the engine.
  5. Voltage at the spark plug is checked using the J 26792 spark plug tester tool. No spark indicates a basic ignition problem.
  6. This test will determine if there is fuel pressure at the fuel injection unit and holding steady.
  7. Use the J 34730-375 injector test lamp in order to test the injector circuits. A blinking lamp indicates that the VCM is controlling the injector.
Engine Cranks But Does Not Run Step
Important: Before clearing the DTCs, use the scan tool Capture info. to save the Freeze Frame and the Failure Records for reference. The control module's data is deleted once the Clear Info function is used.
Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check
Attempt to start the engine.
Does the engine start and continue to run?
Go to Symptoms
Go to Step 3
  1. Install a scan tool.
  2. Monitor the VTD Fuel Disabled parameter.
  3. Crank the engine.
Does the VTD Fuel Disabled parameter display active while you crank the engine?
Go to Diagnostic System Check - Theft Deterrent in Theft Deterrent
Go to Step 4
Monitor the TP sensor on the scan tool.
With the throttle closed, is the TP sensor more than the specified value?
Go to DTC P0121 Throttle Position (TP) Sensor Performance
Go to Step 5
Monitor the ECT sensor on the scan tool.
Is the ECT sensor below the specified value?
?30°C (?22°F)
Go to DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
Go to Step 6
Check for spark at two spark plug wires using the J 26792 spark tester.
Is spark present at both spark plug wires?
Go to Step 7
Go to Enhanced Ignition System Diagnosis
  1. Reconnect the spark plug wires.
  2. Turn OFF the ignition.
  3. Connect the J 34730-1A fuel pressure gauge.
  4. Turn ON the ignition leaving the engine OFF.
Is the fuel pressure within the specified range?
415-455 kPa (60-66?psi)
Go to Step 8
Go to Fuel System Diagnosis
  1. Disconnect the injector connector at the intake manifold.
  2. Install the J 34730-375 injector test lamp into each injector circuit one at a time.
  3. Crank the engine with the injector test lamp in each circuit.
Does the injector test lamp flash for each injector circuit?
Go to Diagnostic Aids
Go to Fuel Injector Circuit Diagnosis

Jul 16, 2015 | GMC Cars & Trucks

1 Answer

My vehicle starts but when I step on the gas it dies.

After it starts does it idle good before you step on the gas , will it keep idling before you step on the gas ? Is the check engine light on ? What engine does the vehicle have ? This vehicle came with 5.0 L ,5.7L ,6.5 L , 7.4 L engines ,gas or diesel ? Three specific data sensors provide the vehicle control module (VCM) with the basic information for the fuel management portion of its operation. Three specific signals to the VCM establish the engine speed and air density factors. The engine speed signal comes from the distributor high resolution circuit. The VCM uses this information to determine engine speed (RPM). Air density is derived from intake air temperature (IAT) and manifold absolute pressure (MAP) sensor inputs. The IAT sensor measures the air temperature that is entering the engine. The IAT signal works in conjunction with the MAP sensor to determine air density. As the intake manifold pressure increases, the air density in the intake manifold also increases and additional fuel is required. This information from the IAT and MAP sensors is used by the VCM to control injector pulse width. One of these sensors could be bad or a plugged catalytic converter .

Dec 27, 2014 | 1998 GMC Suburban

4 Answers

How to reset security ignition on a 1999 chevy silverado?

There is a lot of info on this site that you can read up on.

Sep 07, 2014 | 1999 Chevrolet Silverado 1500

1 Answer

I have no fuel pressure where do i start to find the problem

Okay, hey, the fuel pump circuit. With key on, the pump should turn on for about two seconds to put pressure in the line and in the fuel rail on the engine, where the fuel injectors are. When the engine is cranking, the pump is turned on again by the vcm (Vehicle Control Module-the engine computer) signaling the fuel pump relay, just as it did with key on. After the engine is running, the pump is kept on, usually by the oil pressure switch.
No fuel pressure? Then the pump is not turning on, or the fuel filter is completely blocked-which is rare.

You can start at the Underhood Fuse Block. Here is found the fuel pump relay and the fuse for the pump. The fuse is designated ECM-B Fuse and it's 20 amp. If the fuse is good, put your finger on the fuel pump relay. Now have a helper turn the key to on, not start. If the circuit is good to this point, you should feel movement- a slight click. If you feel nothing, and the fuse is good, then the VCM is not sending a signal to the relay OR there is a wiring problem from one side of the relay to ground. If no click or movement under your finger-you will need professional help to diagnose further-checking of the signal from VCM and/or checking the ground wire for that side of the relay.
If you definitely feel a click at the pump relay, and the fuse is good, the power to the pump is sent out from there on a gray wire. Get under the vehicle at the rear and find the electrical connector for the gas tank, and pull it apart. Now you need a test light or voltmeter to check for power on the gray wire in the connector. You might miss the two second signal with key on, so have your helper hold the key in start. While the engine is cranking, the gray wire should have power-battery voltage. If it does not, big problem: possibly a broken wire or short from pump relay to there at the gas tank.

If the gray wire has power with engine cranking, you're almost home: Either the pump has definitely failed OR the ground for the fuel pump is bad. The ground wire is black and it shares the same ground point as your rear exterior lights, so if the lights work, the ground can be assumed to be good also for the fuel pump. And then you need a new fuel pump. But check the gas tank connector carefully for any sign of corrosion, loose terminals, anything like that amiss. Not likely, but check anyway-you don't want to put in a new pump and then find a loose connection! Good luck.

May 05, 2014 | 1999 Chevrolet Blazer

1 Answer

1986 vw golf wont turn over

A head gasket is a gasket that sits between the engine block and cylinder head in an internal combustion engine. Its purpose is to seal the cylinders. It will still start but it won't run that well and you will damage your engine if you run it with it blown. so check your head gasket again.

Nov 26, 2012 | Cars & Trucks

1 Answer

Why wont my 1996 4.3 gmc jimmy start?

might be ecu fault are there any engine managment lights on dash is there defo fuel getting to engine can you here the pump running just incase its a duff pump if its totaly drained the fuel line it would take a bit to get the fuel to the engine any way

Aug 24, 2012 | 1996 GMC Jimmy

2 Answers

Check engine light VCM code "FUEL 14"?

my manual says fuel fail 14 deals with yourr coolant temperature sensor is no in operating range

Nov 02, 2009 | 1992 Jaguar XJ6

1 Answer

My check engine light is on. The VCM says: PAO.

The PAO you see on your dash in the VCM (Vehicle Condition Monitor) *is really* -PAD-.

I had the same beacon on my 1991 XJ6, it refers to the brake pads being worn.

Fuse 3 is a notice that there is a misbehaving fuse in your 3rd fuse box, which is located inside the center console (armrest)

Best of Luck!

Mar 23, 2009 | 1993 Jaguar XJ6

1 Answer


You can only retrieve the vcm read out code when that car was run, turned off and then the ignition is on(not running), then oush VCM and the code will flash - "fuel failure 69" or something like that. (SOME CODES LIKE 69 ARE ERRONEOUS CODES AND SHOULD BE RESET)What you can do is disconnect the battery for 45 seconds to reset the code and if it comes back on then there is an issue.
You can email me the code and I will tell you what it is

Mar 07, 2009 | 1994 Jaguar XJ6

1 Answer

20amp fuse in black box keeps blowing


The fuse ecm b it tied to the fuel pump, PCM, and VCM.
Fuel pump could have an internal short
check it by the way...


Sep 30, 2008 | 1999 GMC Sonoma

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