Climate Control Diagnostics for the Ford AU II Falcon
- Document Information
- Information on accessing the Climate Control Self Test monitor and diagnostic system
- Vehicle: Ford Falcon (AU II)
- Copyright Owner: Matthew Jones (Matti Jones) (ZerOne)
- Document Visits: 1972
- Created: Wed Oct 13, 2010 5:59 am
- Revised: Wed Oct 13, 2010 6:00 am (Rev 1)
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This Document describes the Climate Control Diagnostic Mode, and the information that can be obtained regarding problems with the module.
The Self test mode completes the following,
- Calibrates the Blend Servo Mode Door
- Completes a continuity check on the sensors, and wiring loom.
- Returns an Error code if an error has been detected.
- Calibrates the Blend Servo Mode Door
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The microcomputer of the control unit self diagnoses incorrect function and will memorise certain faults, should they occur.
This aids in the accurate identification and rapid rectification of a fault.
Depending on the Nature of the fault, the microcomputer will compensate to reduce the effects of the detected fault.
The Detection of the fault is indicated by the display flashing for a period of 6 (six) seconds, after the vehicle has been started.
If a permanent fault occurs in the control unit itself, the system switches off, and outside air is directed to the screen without fan assistance.
Once a fault has been detected, the system retains the error code in the memory and uses the default value until the SELF TEST is run and the fault is rectified.
Self-test can be run again to verify that the problem has been rectified, and is not intermittent.
During the test, the blend door motor is calibrated, and the full hot and full cold motor positions are recorded in the memory of the control unit.
The test also conducts a continuity check on the system to ensure that all the electrical sensors are functioning Correctly.
All the errors should be noted, and the corresponding diagnostic information should be used to help rectify the problem.
Once the fault has been rectified, the self-test should be re-initiated to verify the system is functioning correctly.
The system reverts to 22*C after completing the self test.
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The Climate Control Monitor Mode allows viewing of the Actual Climate Control Sensor Readings and settings, Real time.
It also allows bypassing of some of the Climate Control Basic Functions, for assisting in any Diagnostic troubles, and Climate Control Performance Issues.
At Present, this mode of operation is only covered within the AU Factory Workshop manuals, but does in fact actually work on EF/EL and AU model falcons fitted with Climate Control.
Obviously because of this, it is unknown what the buttons other than the Fan Speed Buttons actually do, whilst in this mode of operation.
If anybody has any ideas or opinions on what the other buttons achieve whilst in this mode, then please let myself know, and I will update these pages with the relevant information
To enter Monitor Mode (EF/EL/AU Models)
- Turn the Ignition switch to the "On" Position
- Press the [MODE], [A/C], and [AUTO] Buttons together
- Release the [MODE], [A/C] Buttons together and the [AUTO] Button Last.
To enter Monitor Mode (EA/EB/ED Fairlane/LTD models)
- Turn the Ignition switch to the "On" Position
- Press the [Recirculate], [Face/Floor], and [AUTO] Buttons together
- Release the [Recirculate], [Face/Floor], Buttons together and the [AUTO] Button Last.
This will now bring you in to the Climate control monitor mode.
Pressing the Fan Up and Down Buttons will toggle the reading that is currently being viewed
The Reading Number that is currently being displayed is shown by the Fan Speed on the LCD Panel.
The Test Readouts available are,
- L - (1 Bar) - Operator Set Temperature in degrees Celsius (??C)
- 2 - (2 Bars) - Cabin Temperature in degrees Celsius (*C)
- 3 - (3 Bars) - Ambient Temperature in degrees Celsius (*C)
- 4 - (4 Bars) - Evaporator Temperature in degrees Celsius (*C)
- 5 - (5 Bars) - Engine Coolant Temperature in degrees Celsius (*C)
- 6 - (6 Bars) - Sun load Sensor Reading
- 7 - (7 Bars) - Fan Speed percent (%)
- 8 - (8 Bars) - Temperature Blend Door Flap percentage (%) opening
- 9 - (9 Bars) - Aircon and Vent Selection (00 A/C Off Floor) (11 A/C On Face) (22 A/C Off Face/Floor) (33 A/C On Screen/Floor) (4 Screen)
- H - (10 Bars) - Water Heater Valve operation (1=On, 0=Off)
To exit this mode, simply switch off the ignition.
As mentioned above, I have very little information on this mode of operation
Any extra information, or feedback in to any other features within this mode are greatly appreciated !
- Turn the Ignition switch to the "On" Position
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- Ensure that the engine is warm (At least 45*C) Coolant temperature
- Turn the ignition switch to the "ON" Position.
- For EA-ED Models, Press the "Floor" and "Off" Buttons Simultaneously and Release. After which, all the Climate Control Panel LED's should Illuminate.
- For EF/EL/AU Models, Press the "MODE" and the "OFF" Buttons on the climate control module simultaneously and then release.
- The control will display 88.8* during the time required for the self-test to be completed.
- When the self-test is complete, and the system checks are OK the display will read "OFF". If the system has a fault the display will read "E" and a number from 1 to 8. In the event that multiple errors have been recorded, they can be viewed by pressing the "AUTO" Button.
- rectify the problem and clear the fault from the controller memory by initiating the self-test mode twice.
- The self-test can be initiated at any time with the resulting error codes being displayed. Normal operation of the system stops when the self-test is activated. To exit self-test and restart the system, push the "AUTO" button. Self-test should be deactivated before shutting the system off. Refer to the Error Code Key in Table 1 for an explanation of error codes.
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ERROR CODE DESCRIPTION CONDITION DETECTED DEFAULT VALUE COMMENT E1 Electronic Control Unit Faulty Electronic Control Unit RAM air to screen Replace unit E2 Blend Door Servo Motor Movement of Blend Door out of Range Poor Temperature Modulation Check if motor is disconnected, door movement obstructed, or incorrect wiring E3 Cabin Sensor Open Circuit Set point directly controls thermal control valve Check for disconnected cabin sensor E4 Solar Sensor Short Circuit No sun load compensation Check for short in wiring or sensor E5 Ambient Sensor Open Circuit Assumes abient is 20*C Check for disconnected sensor E6 Evaporator Temperature Sensor Open circuit between sensor and EEC V Module A/C Clutch does not engage Check for disconnected sensor E7 Engine Temperature sensor Short Circuit between sensor and EEC V Module Assumes hot engine, I.E. 93*C Check for short in wiring or sensor E8 (EF/EL/AU Only) - EEC V Communication Line Fault Faulty Line All values from EEC V set at default value of 1*C Check EEC V communication line to ACC
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- Start the engine
- Press the Auto Button
- Set control to 30* Setting
- Control Unit Powers Up - Go to test 2
- Control unit does not light up - Go to Test G
- Verify that fan starts on low speed
- Fan on low speed - Go to test 3
- Fan off - Go to Test C
- Fan high speed - Go to test D
- Warm engine to normal operating temperature
- Warm air is discharged from floor ducts - Go to test 4
- Cool air is discharged - go to test A
- Set control to 18*C setting
- Cold air is discharged from face ducts - go to test 5
- Air is not cold - Go to Test B
- Set control to 22*C setting
- Press the Demist Button
- Air is discharged from the demist area, on to the screen and fresh/recirc door is in the fresh position - go to test 6
- Air is not discharged from the demist area - Check Vacuum hoses
- Fresh/Recirc door is not in the fresh position - Check Vacuum Hoses
- Press the AUTO button
- Press the RECIRC Button
- Fresh/Recirc door is in the Recirc position - Go to test 7
- Fresh/Recirc door is in the Fresh Position - Check vacuum hoses
- Set to face mode
- Air is discharged from the face outlets - Go to test 8
- Air is not discharged from the face outlets - Check vacuum hoses
- Repeat step 7 for Face/Floor, Floor/Screen, and Floor Modes
- Air is discharged from the appropriate outlets - Go to test 9
- Air is not discharged from the appropriate outlets - Check Vacuum hoses
- Press the Auto button
- Press the manual fan speed override
- Adjust to low speed
- Fan goes to low speed - Go to test 10
- Fan does not go to low speed - Check diagnostic tests C and D
- Ramp the fan speed to high speed, i.e. until the "H" is displayed
- Fan goes to high speed - Go to test 11
- Fan does not go to high speed - Go to test E
- Press the Auto Button
- The word Auto is displayed on the climate control screen
Functional
TestInstructions Result and Action 1 2 3 4 5 6 7 8 9 10 11
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- Cool discharge air when system is set to 30*C
- Heater Malfunction - Check if hot water valve is open, if not check vacuum hoses
- Blend door not in maximum heat position - Check blend door motor
- Cabin sensor is shorted - Check sensor and sensor wiring loom
- Warm discharge air when system is set to 18*C
- Air conditioning clutch malfunction - Check air conditioning clutch, and wiring loom
- Blend door not in maximum cold position - Check blend door motor
- Low refrigerant level - Refill air-conditioning refrigerant
- No Fan
- Faulty wiring - Check wiring
- Faulty Fan Controller - Replace
- Faulty fan motor - replace
- Faulty control unit - replace
- High Fan only
- Faulty wiring - Check wiring
- Faulty fan controller - replace
- faulty control unit - replace
- Fan will not go to high speed
- Faulty wiring - Check wiring
- Faulty fan controller - replace
- faulty control unit - replace
- A/C is on continually
- Short circuit in evaporator sensor - Check resistance across sensor terminals. Change if sensor shorted
- Faulty wiring - Check wiring
- Faulty control unit - replace
- Control head digits and LED's do not light up
- Fuse - Check and replace fuse
- Ignition circuit - Check wiring
- Illumination circuit - Check backlight globe and replace
- Illumination dimming circuit - Check Body electronics module
- Ground circuit - Check wiring
- Faulty control unit - replace
- System stays in cold engine lockout air to screen low fan speed when engine has reached normal operating temperature
- Engine sensor open circuit - Check sensor is connected - Check circuit - Check sensor resistance should be less than 5KOhm
- System does not control temperature
- Cabin sensor hose not connected to sensor or air hose - Inspect and repair cabin sensor vacuum hose
- Cabin engine vacuum line sensor obstructed or not installed properly - Inspect and repair
- Cabin sensor hose kinked or damaged - Inspect and repair
- Vacuum line disconnected - Check and connect
- System runs hot during high sun load conditions
- Sun load sensor open circuit - check if sensor is connected - Check sensor is not covered - Check sensor function - Check wiring
- System overcools at normal comfort setting
- Ambient temperature short circuit - Check circuit - Check circuit - Check resistance across sensor terminals, change sensor if shorted
Diagnostic
TestSymptom Possible Cause and Repair Procedure A B C D E F G H I J K