Automatic Gearbox system fault finding and other references: 4HP14 4HP20 AL4 MB3 Diagnosis : 4HP14 automatic gearbox : Diagnosis : 4HP20 automatic gearbox : BVA4 & HP20 Gear engagement thresholds: Diagnosis : AL4 automatic gearbox : Diagnosis : Origin of possible oil leaks - AL4: AL4 Gear engagement thresholds: Diagnosis : MB3 automatic gearbox : citroendata.co.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Diagnosis : Autoactive automatic gearbox (type AL4) : BVA AL4 AND AL4 (HP16) AND AL4 AUTOMATIC GEARBOX 1. Diagnostic tools 1.1. ELIT : 4125-T test unit The tool can be used for : ● Identifying of the ECU ● Fault reading ● Erasing the faults ● Parameter measurements ● Operating the actuating components ● Pedal initialisation ● Configuring the ECUs ● Updates to be downloaded into the ECU 1.2.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Operating the actuating components ● Pedal initialisation ● Configuring the ECUs ● Updates to be downloaded into the ECU ● Consultation of the electrical wiring diagrams 1.3.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) The automatic gearbox harness 1.5. Electrical harness C.0338.L The tool allows ohmmeter checks to be carried out on : ● The multifunction switch ● The electrovalves ● The gearbox temperature and input speed sensors 2. Fault finding chart 2.1. Fault list (1) Ignition controlled + supply . (2) ECU . (3) Automatic gearbox input speed (turbine speed) . (4) Automatic gearbox output speed (vehicle speed) . (5) Engine speed .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) (13) Lock-up electrovalve (lock-up EVM) . (14) Torque reduction . (15) Engine torque signal . (16) Throttle potentiometer via the engine ECU . (17) Electrovalve with sequence of 1 to 6 . (18) Exchanger flow electrovalve . (19) "shift lock" gear lever locking . (20) "Full throttle" position (kick down) . (21) Multifunction switch connections . (22) OBD output .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) 2.3. Fault code 2 : ECU "sport" and "snow" warning lamps are flashing : Yes . Clear the fault and check that the fault does not reappear , Otherwise, perform the test with a new ECU . 2.4. Fault code 3 : Automatic gearbox input speed (turbine speed) "sport" and "snow" warning lamps are flashing : Yes . The ECU checks the coherence of the information relating to the engine speed and gearbox input and output speeds .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Disconnected 45 - 46 D1 - D2 . 33 - Diagnostic way grey equipment : Ohmmeter . R = 300 ? If not, the automatic gearbox input speed is calculated using the gearbox output speed , And the turbine overspeed, declutching on stopping, lockup and torque reduction functions are no longer in operation Check the continuity and isolation of the gearbox ECU Gearbox input speed sensor connection 2.5.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Gearbox Connected output speed sensor (1621) - - Diagnostic equipment reading the parameters : Variable The figure increases with the vehicle speed Check that the status of the electrovalves and regulators corresponds to the expected gear Disconnected 48 - 47 1 - 2 . 2 -way Diagnostic black equipment : Ohmmeter .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) 2.6. Fault code 5 : Engine speed "sport" and "snow" warning lamps are flashing : Yes . The ECU checks the coherence of the information relating to the engine speed and gearbox input and output speeds . Location of components ECU connector Test connector box no Component connections Test values Emergency mode Engine speed Connected - - Diagnostic equipment reading the parameters .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Engine running : U 6,6 V in DC Disconnected 49 44 (XU7JP4/ L4). 6 (XU10J4R/L3 and XU7JP4/ L3). 11 (XUD9BTF/ L3) Open circuit : U = U battery If the engine speed fault is accompanied by a gearbox input speed or output speed fault : Selection of back-up mode Diagnostic equipment : Ohmmeter - Check the continuity and isolation of the gearbox ECU Engine ECU connection 2.7.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Stop switch (2100) Connected 16 - 28 - Diagnostic No equipment : declutching Voltmeter . on stopping Brake pedal released : U = 0 V . Brake pedal applied : U = U battery Disconnected 16 2 . 3 -way brown Diagnostic equipment : Ohmmeter . Check the continuity and isolation of the gearbox ECU - Stop lamp switch connection No shift lock function . No converter lock-up function 2.8.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Supply to the Connected analogue sensors, gearbox ECU output 24 - 25 - Oil pressure control : Operating in an open loop Check that the Oil temperature fixed at 100 °C ECU supply voltage is > 8 V (terminal 27 of the gearbox ECU) . Ignition on : U > 4,5 volts 52 - 51 Disconnected Diagnostic equipment : Voltmeter . Throttle potentiometer disconnected . 33 -way grey connector disconnected 24 C1 (1635) .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) "sport" and "snow" warning lamps are flashing : No .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Temperature at 60 °C , R = 600 Ohms Check the continuity and isolation of the gearbox ECU Oil temperature sensor connection 2.10. Fault code 9 : Oil pressure "sport" and "snow" warning lamps are flashing : Yes . The pressure sensor supplies the gearbox ECU with a voltage proportional to the line pressure .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Ignition on , Engine running (oil temperature > 15 °C) Position N or P : Oil pressure = 2,5 bars . U 1,4 V Disconnected 24 . 55 . 25 C1 . C2 . C3 . 33 -way grey Diagnostic equipment : Ohmmeter - Check the continuity and isolation of the gearbox ECU Oil pressure sensor 2.11. Fault code 10 : Pedal position via the throttle potentiometer "sport" and "snow" warning lamps are flashing : Yes .
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citroendata.co.uk - Autoactive automatic gearbox (type AL4) "sport" and "snow" warning lamps are flashing : Yes . Location of components ECU connector Test connector box no Component connections Test values Emergency mode Instrument panel (0004) Connected 4 - 28 - Move the gear selector lever and check the display .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) EVM electrovalve (in the hydraulic valve block (1635) ) Connected Disconnected 26 - 20 20 - B9 http://www.citroendata.co.uk/technical/autobox/al4.htm (17 of 43) [12/18/2007 15:33:31] Diagnostic Selection of equipment back-up reading the mode parameters . Check : Oil pressure . OCR of EVM pressure .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) 26 B12 . 33 -way Check the grey continuity and isolation of the gearbox ECU Hydraulic valve block connections (supply and control of the pressure modulation electrovalve) Refer to the procedure : Location of the electrovalves in the hydraulic valve block . 2.14. Fault code 13 : Lock-up electrovalve (lock-up EVM) "sport" and "snow" warning lamps are flashing : Yes .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Check the supply to the electrovalve (channel 26 from the ECU : U = U battery) Ignition on : U =0V Engine running , Position N or P : U 1,5 V Disconnected 19 B6 Diagnostic equipment : Ohmmeter Retention of the fault until the next engine start 26 B12 .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Location of components ECU connector Test connector box no Component connections Test values Emergency mode Gearbox ECU (1630) Connected 5 - 28 - Diagnostic equipment reading the parameters : Check activation of the torque reduction function when changing gear No more commands from the gearbox ECU output stage (snatching on changing gear) Disconnected 5 7 (XU7JP4/ L4).
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Location of components ECU connector Test connector box no Component connections Test values Emergency mode Engine ECU connection Connected 22 - 28 - Read the torque value using diagnostic equipment to measure the parameters .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Location of components ECU connector Test connector box no Component connections Test values Emergency mode Throttle position via engine ECU Connected 23 - 28 - Diagnostic equipment : Voltmeter Without torque information : Pedal setting at maximum : Selection of back-up mode Engine stopped, ignition on . Pedal released : U 8,5 V . Midtravel : U 6,7 V - Full throttle : U 5 V .
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citroendata.co.uk - Autoactive automatic gearbox (type AL4) 1 selected 0 0 U battery U battery 0 0 2 selected 0 U battery 0 U battery 0 0 3 selected 0 0 0 0 0 0 4 selected U battery U battery 0 0 0 0 Rear 0 0 0 0 0 0 Reverse lock- 0 up 0 0 0 U battery 0 N/P 0 U battery 0 0 0 0 Refer to the procedure : Location of the electrovalves in the hydraulic valve block . 2.19.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) The electrovalve is activated and U=U battery . If not : U = 0 V Disconnected 12 E2 . 33 -way grey Diagnostic equipment reading the parameters : Check the activation of the electrovalve - Diagnostic equipment : Ohmmeter - R 2-12 = 40 ? - Check the continuity and isolation of the gearbox ECU Hydraulic valve block 2.20. Fault code 19 : "shift lock" gear lever locking "sport" and "snow" warning lamps are flashing : No .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Disconnected 11 Engine stopped, ignition on , Position P : U = U battery If not , No more commands from the gearbox ECU output stage Apply the brake pedal and keep it depressed : U =0V - 2 (relay 1642) Diagnostic equipment : Ohmmeter - 5 -way grey - Check the continuity and isolation of the gearbox ECU - Lever blocking relay connection 2.21.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Kick-down switch (1637) Connected - - Diagnostic equipment reading the parameters : Full throttle : The "kickdown" function is activated and the "kickdown switch" becomes 0 15 - 28 - Diagnostic equipment : Voltmeter Depress the accelerator pedal fully : U =0V If not : U = U battery Disconnected 15 1 Diagnostic equipment : Ohmmeter 2 -way brown Check the continuity and isolation of the gearbox ECU Kick-down switch connection 2.22.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Location of components ECU connector Test connector box no Component connections Test values Multifunction switch via the electrohydraulic connector Connected - - Diagnostic Selection of equipment : back-up Voltmeter . mode See the table 1 below Disconnected 37 . 31 . 32 A9 . A10 . A11 33 . 34 Emergency mode Diagnostic Fault code equipment : for display Ohmmeter . See the table 2 below A12 . A8 .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) * 0V U battery U battery 0V U battery 3 0V U battery 0V 0V U battery * 0V U battery 0V U battery U battery 2 0V 0V 0V U battery U battery (*) : Intermediate .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) * R=0 ohm = R=0 ohm = 2 R=0 ohm R=0 ohm R=0 ohm = (*) : Intermediate . Check the continuity of A4 - Body earth . Check the continuity and isolation of the connection A8 (electro-hydraulic connector) - 34 (automatic gearbox ECU) . 2.23. Fault code 22 : OBD output This fault can only exist with L4 emission standard (engine XU7JP4/L4) .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Disconnected 6 67 (XU7JP4/ L4) Diagnostic equipment : Ohmmeter . Check the continuity and isolation of the gearbox ECU - Engine ECU connection - 3. Symptoms detectable in downgraded modes 3.1.
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citroendata.co.uk - Autoactive automatic gearbox (type AL4) Gearbox oil temperature information 3.2. Selection of back-up mode N.B. : Only 3rd gear and reverse are available . The clutch slips when starting .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) (1) Programme selector connection . (2) Reversing lamp control . (3) Position "P" not selected audible warning (key lock) . (4) Excessively high oil temperature . (5) Pressure regulation fault . (6) Lock-up fault . (7) Engine starting authorisation . (8) Diagnostic line . 4.2.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Sport programme selection (on selector (1640) ) 40 - 28 4 - 6 . 7 -way grey Diagnostic equipment : Voltmeter . Ignition on : Snow button pressed down : U = 0 V . Snow button released : U = U battery Disconnected 40 4 . 7 -way grey Diagnostic equipment : Ohmmeter .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Normal programme selection (on selector (1640) ) Disconnected 41 7 . 7 -way grey Diagnostic equipment : Ohmmeter . Check the continuity and isolation of the gearbox ECU Programme selector connection Connected - - Diagnostic equipment reading the parameters : When neither the sport nor the snow programme are selected : Selection : ECO . Snow switch : 1 . Sport switch : 1 40 - 28 4 - 6 . 7 -way grey 41 - 28 7 - 6 .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) 1st gear imposed selection (on selector (1640) ) Connected Disconnected - - The selector lever is in position 2 . Diagnostic equipment reading the parameters : 1st gear imposed : Passes to 0 while the 1st gear imposed button is down . Check that the warning lamp in the instrument panel is on 36 - 28 2 - 6 . 7 -way grey Diagnostic equipment : Voltmeter . Ignition on : 1st gear imposed button held down : U = 0 V .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Connected A2 - A1 - Diagnostic equipment : Voltmeter . Ignition on : Check that U = U battery at terminal A1 . If not : Check fuse F12 . Position R : U = 0V Disconnected A1 1 (3 -way yellow) (2631) Diagnostic equipment : Ohmmeter 4 (4 -way blue) (2632) or 4 (4 -way white) (C310) , If towing equipment is fitted Check the continuity and isolation of the electro-hydraulic block connection - Reversing lamps 4.4.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) 4.5. Check 4 : Excessively high oil temperature If the oil temperature exceeds the limit of 118 °C : The "sport" and "snow" warning lamps flash . Check that the flow electrovalve in the exchanger is not short circuited to battery + . Check by reading the parameters with the diagnostic tool : Excessively high oil temperature .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Emergency mode : ● Selection of back-up mode ● Setting the line pressure to maximum ● Regulation in open loop 4.7. Check 6 : Lock-up fault (and not EVM lock-up) The ECU has detected clutch slip . Emergency mode : No lock-up and declutching on stopping functions . 4.8.
citroendata.co.uk - Autoactive automatic gearbox (type AL4) Centralised diagnostic socket (C001) (16 -way black) Disconnected 17 . 18 15 . 7 . 16 -way black Diagnostic equipment : Ohmmeter . Check the continuity and isolation of the gearbox ECU Diagnostic socket connection 5. Downloading Downloading an update into the gearbox ECU : Follow the diagnostic equipment procedure . The downloading operation makes it possible to update the automatic gearbox ECU, or to adapt it to an engine ECU evolution .
citroendata.co.uk - Autoactive automatic gearbox (type AL4) The used oil counter is read or entered using the menu : "configuration (integrated circuit button) / oil counter" . The value of the oil counter is adjusted in incremental steps of 2000 . 6.2. LEXIA diagnostic station - ELIT test unit The used oil counter is read or entered using the menu : "oil counter" . The value of the oil counter is adjusted by entering the 5 figures from the oil counter directly . 7.
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citroendata.co.uk - Diagnosis : Origin of possible oil leaks - AL4 Diagnosis : Origin of possible oil leaks - AL4: BVA AL4 AND AL4 (HP16) AND AL4 AUTOMATIC GEARBOX CAUTION : An oil leak from the automatic gearbox could cause it to malfunction or be damaged . URGENT : After any repair, check the fluid level . 1. Description of the seals Reference Description 1 Left hand driveshaft seal 2 Input speed sensor O ring 3 Oil flow modulation electrovalve O ring http://www.citroendata.co.
citroendata.co.uk - Diagnosis : Origin of possible oil leaks - AL4 4 Output speed sensor O ring 5 Heat exchanger and fixing bolt O ring (x3) 6 Hydraulic valve block cover seal Reference Description 3 Oil flow modulation electrovalve O ring 6 Hydraulic valve block cover seal 7 Housing seal 8 Vehicle speed sensor O ring http://www.citroendata.co.uk/technical/autobox/al4oilleaks.
citroendata.co.uk - Diagnosis : Origin of possible oil leaks - AL4 9 Gearbox oil filler plug seal 10 Gear selection lever lipped seal 11 Wiring harness interconnection seal in the hydraulic valve block 12 Gearbox cover seal 13 Quadrant shaft O ring CAUTION : Removal of the seal (13) entails a systematic adjustment of the selector lever in the hydraulic valve block. Reference Description 7 Housing seal 12 Gearbox cover seal 14 Gearbox oil level plug seal http://www.citroendata.co.
citroendata.co.uk - Diagnosis : Origin of possible oil leaks - AL4 15 Overflow seal 16 Oil pressure sensor seal 17 Plug seal Reference Description 8 Vehicle speed sensor O ring 18 Convertor sealing ring 19 Right hand driveshaft seal 2. Location of the various seals http://www.citroendata.co.uk/technical/autobox/al4oilleaks.
citroendata.co.uk - Diagnosis : Origin of possible oil leaks - AL4 citroendata.co.uk http://www.citroendata.co.uk/technical/autobox/al4oilleaks.
citroendata.co.uk - Diagnosis : Origin of possible oil leaks - AL4 View My Stats http://www.citroendata.co.uk/technical/autobox/al4oilleaks.
