X300 Air Conditioning Self Test and Diagnostics

A VIDEO OF USING TEST MODE

To check for error codes in the Climate Control System with the internal diagnostics via the ‘Panel

Codes’

1. Ignition off - hold down AUTO and RECIRCULATION buttons and

switch on the ignition

2. press AUTO button - if ZERO shows, there's no stored

error codes

3. Press the RECIRCULATED AIR button to start diagnostic, sequence will start to test system.

4. press FACE button repeatedly to scroll through stored

fault codes

5. press FACE and HEATED REAR WINDOW buttons together to

clear a fault code.

6. repeat step 4 if there's more than one code

7. press FAN button to exit Interrogation Procedure

.

Control Panel Fault Code Listing

Reference fault code #23*: In ambient temperatures below 0°C, this code may be logged

because the low ambient causes a temporary low gas pressure. Where the ambient temperature

rises above 40°C, with the engine close to overheating, electrical feed to the compressor clutch

may be cut and code #23 registered.

0 Normal operation no fault codes present None Wait 30 seconds for system self-check.

11 Motorized in-car aspirator malfunction Harness / connector fault Sensor open / short circuit

Panel fault codes are not stored for motorized in-car aspirator motor failure.

12 Ambient temperature sensor malfunction Harness / connector fault Sensor open / short circuit

After rectification, disconnect the vehicle battery for 10 seconds to reset the system.

13 Evaporator temperature sensor malfunction Harness / connector fault Sensor open / short

circuit Refer to PDU

14 Water temperature input malfunction Instrument cluster output Refer to PDU

15 Heater matrix temperature sensor malfunction Harness / connector fault Sensor open / short

circuit Refer to PDU

21 Solar sensor Sensor open /short circuit Refer to PDU

22 Compressor lock signal fault Low refrigerant charge, low compressor oil level, loose drive belt

Harness / connector fault Adjust items as required

23 Refrigerant pressure switch malfunction Harness / connector fault Switch open / short circuit

Refer to PDU23 Refrigerant pressure low refrigerant charge *Leak from damaged pipe or joint

Rectify as required and recharge system

24 Face vent demand potentiometer fault Potentiometer open / short circuit Harness / connector

fault Refer to PDU

31 LH fresh / recirc. potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

32 RH fresh / recirc. potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

33 Cool air by-pass potentiometer fault Harness / connector fault In certain circumstances the

servo motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

34 Defrost vent potentiometer fault Harness / connector fault In certain circumstances the servo

motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

35 Centre vent potentiometer fault Harness / connector fault In certain circumstances the servo

motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

36 Foot vent potentiometer fault Harness / connector fault In certain circumstances the servo

motor may over-travel and cause further logged faults. This may be cured, following fault

rectification, by cycling the ignition ON-OFF-ON 3 times Refer to PDU

41 LH fresh / recirc. motor fault Harness / connector fault Servo motor seized or sticking Flap

seized or sticking Refer to PDU

42 RH fresh / recirc. motor fault Harness / connector fault Servo motor seized or sticking Flap

seized or sticking Refer to PDU

43 Cool air by-pass motor fault Harness / connector fault Servo motor seized or sticking Flap

seized or sticking Refer to PDU

43 Cool Air by-pass motor fault Harness / connector fault Servo motor seized or sticking Flap

seized or sticking Refer to PDU

44 Defrost vent motor fault Harness / connector fault Servo motor seized or sticking Flap seized

or sticking Refer to PDU

45 Centre vent motor fault Harness / connector fault Servo motor seized or sticking Flap seized or

sticking Refer to PDU

46 Foot vent motor fault Harness / connector fault Servo motor seized or sticking Flap seized or

sticking Refer to PDU

PDU DTC codes: not generally accessible with a generic OBDII code reader but linked

to the above may provide additional ‘Possible Causes’

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95 Sedan range interior illumination issues

1995> Sedan Range vehicles may experience fascia panel lighting and interior lighting malfunctions that can be caused by the back of the radio chafing on the fascia harness, In-Car Entertainment (ICE) system harness or the center console harness.

Some conditions found to be caused by harness chafing include:

^ Dimmer module fuse blows - shorted to ground.

^ No locate lighting.

^ No interior lighting.

^ Interior lighting remains ON - ground wire from module constantly grounded. 

^ Control panel illumination faults.

^ Hazard flasher light remains ON at all times.

^ Climate Control panel inoperative.



1. Remove the radio, switch pack and climate control panel as an assembly.

2. Check the harnesses running along the console and behind the radio for evidence of chafing.

3. If chafing is found, repair the wires, apply suitable protection such as 3M Glass Cloth Tape or convoluted tubing to the harness and secure the harness away from the sharp edges of the radio chassis and heat sink.

4. Check the operation of the systems listed.

5. Reinstall the climate control panel and the radio.

6. Check the operation of all systems.

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Jaguar TPS X300/XJ6 Tips

The throttle position (Jaguar Part No. JLM12074) sensor (a potentiometer or variable resistor) sends information via voltage to various other components in the car. One key thing being how much gasoline to inject into the engine. A general side of a problem is increased rpm's, problems with O2 sensors and shifting issues. This sensor is easily damaged during cleaning of the throttle body by carburetor cleaner entering the unit.

Back of  original TPS

The correct output voltage is .6 volts. You will need a digital volt meter to check with. It is possible for a small amount of adjustment due to some play in the size of the bolt holes which can be carefully enlarged to allow more adjustment.

A small file or a drill bit might be used to make the holes oval/slotted. This unit can be replaced without removal of the throttle body from under the car.  It maybe necessary to remove the oil filter to have room.

It should be noted that a dirty or sticky throttle body or weal throttle spring can also effect incorrect idle speeds.

A possible replacement part that can be adopted for the 12cyl. with minimal work is Ford part number 90TF9B989 or AC Delco part number 213-848 for a 4-cly 1993 Ford Mustang. More details HERE.

Adapted Ford TPS

See also Standard Motor Products Part No. TH417.


To test it, you’ll need to hook your voltmeter up to the TPS without disconnecting the harness.

Have the ignition on, with the Throttle Pulley at the idle position.  The voltage should measure between 0.58 and 0.62VDC. If not, remove the Throttle Pulley and loosen the three small mounting screws holding the TPS and rotate the TPS until the voltage reading is within range.

Now, rotate the Throttle Pulley and watch your voltmeter – make sure the voltage increases smoothly – any drops would indicate a break or other problem in the TPS or a jumping reading indicates a dirty wiper arm inside the unit indicating it needs replacement.  Do this at least a few times.

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X300/XJ6 boot light inspection

XJ6 boot lights

The inside of an X300 boot.  The cargo/boot lights were need of repair. The problem was broken power wire at boot hinge. Thanks goes to Gunnar.

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Changing Rear Axle bearings

Advice from Jag-Lovers forum

This is a DIY job - do each side one at a time, there's a spacer inside the hub that'll be different (most likely) on each side.
You will need to replace the stub axle nuts.  They have an locking insert in them and usually come apart on disassembly.
Mark the pivot bolt and lower control arm so you can reassemble keeping the rear tracking from changing.
I prefer to keep the hand brake cable attached to the hub. There's a union near the ''Y'' in the cable and I feed the
halves out of the lower sub-frame.
Do not let the hub flop down off the axle on it's pivot bolt, that can damage the hand brake cable.
Have someone (or something) press on the brake pedal when loosening the stub axle nuts.  They are TIGHT!
Originally, it is thought that Jaguar used a thread locking compound on the splines between the hub and stub axle.  Can be difficult
to separate if they've never been serviced from new.
Only special tools are a big socket and bar to loosen the axle nut, a brass drift and hammer to remove the old bearing
races and install the new ones.

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The Solar Sensor

The solar sensor is on the top of the dash, just behind the windscreen - here is an explanation of how it works:

In the morning or in the shade, when it's cooler, the a/c system comes on quietly and efficiently as expected when you start your car. If, however, it's been sitting in the sun, the a/c system comes on normally when the car starts but, after a few seconds, the blower system goes into ''high gear'' to cool down the cabin quickly.

Then, after the temperature has been reduced, it goes back into normal mode once again. It may not be apparent with your test methods but, as another poster has said, it's not like Jag or anyone else would install a piece that didn't have some purpose.

That sensor feeds info to the ECU that controls the cabin environment along with the thermostat and other sensors in the cabin. The "bump" detects high temps due to sunlight and tells the ECU that the sun has been shining bright into the cabin and to crank up the fan speed as soon as a cool air temp is detected in the airflow of the a/c. Once a more normal temp level is detected indicating that the super heated air has been evacuated, the system goes back into normal mode.

Jim B. writes, "It works that way on my car, anyway. I still recall the first time it happened after we only had the car for a week or so. It sat in the parking lot and was super warm. When the fan went into hypermode, it caught me by surprise as it was the first time it had done that. I thought I'd turned something on but it was doing it all by itself."

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X300 Key-Fob transmitter programming

Key-ring remote Battery changing:
Caution: To avoid disrupting the coding of the key-ring transmitter, battery change must be accomplished within two minutes.
Insert a screwdriver into the slot in the rear of the key-ring transmitter near where it joins the key ring and gently push it in so as to release the clip to allow the cover to pop open
Replace the two button batteries CR2016.

Existing key-ring transmitter Re-Programming X300:
Unlock the car with the key and press ether button three times at 1 second intervals
New virgin key-ring transmitter Programming:
Open the boot/trunk lid and drivers door. Switch on the ignition to position II but do not start the engine. Wait for the dash lights to extinguish. within 5 seconds of the lights going out, Rock the valet switch, in the centre console, 5 times. The system will chirp to indicate it has entered learning mode.

On models with seat/mirror/steering wheel memory functions, the first key-ring transmitter will be linked to memory 1, second to memory 2 etc
Press and hold the larger, lock, button on the key-ring transmitter whilst watching the Red LED and ether wait for it to stop flashing or for the system to chirp a confirmation it has got the signal. If the system doesn't receive any signals for 15 seconds, it will chirp twice and exit learn mode

To program further key-ring transmitters, rock the valet switch once. The system will chirp twice for remote number two, three times for number three etc, then press the lock button of the key-ring transmitter as above
When finished, wait 15 seconds for the system to time out and chirp twice, turn off the ignition, close the doors and boot lid.

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