Linde LHC Electronics
WINDOW 8 ADJUSTMENT OF TRACTION POTENTIOMETER
2.10.1.3.7 MENU WINDOWS IN DETAIL - LHC SOFTWARE VERSION 1.6 WINDOW 1 INFORMATION ON SOFTWARE VERSION AND TRUCK TYPE
This window displays general information on the truck as detected by the Test Module.
1st line: Controller designation
2nd line: Software version of both processors 3rd line: Designation of diagnostic program 4th line: Truck model code:
(see window (11)) series, LPG/Diesel, 1/2 pedal(s)
NOTE: If the information displayed in the window does not correspond to the truck version, there is a fault in the wiring or the electronic controller.
WINDOW 11 (MASTER VERSION) INFORMATION ON TRUCK TYPE CODE IN THE CABLE LOOM
The first line displays a 12-digit number, the so-called compiler number of the software version.
CTrk Truck series code
CPed: Pedal type code 0 2 pedals 1 1 pedal
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CSpl Equipment code
01 Special truck -> not displayed on all trucks or not supported 10 Series truck
WINDOW 12 (MASTERVERSION) COMPARISON OF MASTER AND SAFETY PROCESSOR CODES
The signals are displayed in pairs (XY) with the following declaration:
X is the code read by the master processor Y is the code read by the safety processor
In trouble-free operation X always equals Y, with both processors reading the same code.
CTrk XY XY
11 11 BR 350
00 11 BR 351 H20, H25 11 00 BR 351 H30, H35
00 00 BR 352
CEng XY
00 Diesel
11 LPG
CPed XY
00 Two-pedal 11 Single-pedal
CSpl XY
00 Special truck -> not displayed on all trucks or not supported 11 Series truck
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WINDOW 2 CURRENT STATUS MESSAGES AND FAULT MESSAGES
This window displays a message if driving is restricted or disabled for safety reasons. The messages are displayed only as long as the restriction or problem exists. In case of faults the red warning lamp will flash;
in case of wrong driver commands such as depressing the brake pedal, the lamp will not illuminate.
The current truck status messages are displayed as a single-digit number, the fault message as a two-digit number.
Example: (19) = not calibrated
Example: 1 = Brake switch 1 operated Example: 2 = Brake switch 2 operated
In the above example, brake switch 1 and 2 are operated, i.e. the engine can be started. Error 19 was detected, i.e. not calibrated. When the brake pedal is released, the numbers 1 and 2 will disappear, whereas the fault number 19 will still be displayed. The engine can be therefore be started, but the truck will not move off if an accelerator pedal is operated.
The meaning of the status and error numbers are listed in the following table.
The fault codes have the following meaning:
Status messages:
If none of the following status messages are shown in window 2, the truck is operational if no other fault has been detected in the truck.
1 Brake pedal switch 1S5 operated (brake pedal is partially depressed) 2 Brake pedal switch S14 operated (brake pedal is depressed)
3 Brake pedal not yet depressed after turning on the ignition 4 Seat switch not operated
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Fault messages:
The following reactions can be witnessed on the truck when a fault occurs:
W Warning lamp flashing K Truck drives at creep speed
B Truck brakes to a standstill or remains stationary if not yet moving R Current only achieves start of pump control
E All power stages without power L Engine goes to low idling speed
F Release magnet de-energised, truck braking with brake jets (restrictors) S Safety relay in the controller de-energised, all power stages without power
Test conditions:
Battery min. 11.3 V
Potentiometer calibration --> window 8
NOTE: If no calibration is possible, there may be a problem with the pedal mechanism in addition to a defective potentiometer.
Error number
19 Not calibrated
A new LHC control module was installed in the vehicle so that the reference value of the potentiometer must be transmitted to the module. --> window 8 (calibration)
NOTE: If the LHC module is not supplied with electric power for several hours, error code 19 can appear --> window 8 ( calibration)
Truck responses: W – E – L – F – S 20 Invalid truck encoding
No truck type detected.
Possible cause could be a defective cable loom. Check by measuring the inputs and outputs on the LHC module.
Truck responses: W – E – L – F – S 21 Invalid engine type encoding
The wrong engine type was identified (e. g. LPG instead of diesel engine)
Possible cause could be a faulty cable loom. Check by measuring the inputs and outputs on the LHC module.
Truck responses: W – E – L – F - S 22 Invalid series encoding
A wrong series was identified (e. g. 351 instead of 350)
Possible cause could be a defective cable loom. Check by measuring the inputs and outputs on the LHC module.
Truck responses: W – E – L – F – S
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23 Invalid series / special version encoding
A wrong version was identified (e. g. instead of special version - fixed programmed speed reduction, a series version)
Possible cause could be a defective cable loom. Check by measuring the inputs and outputs on the LHC module.
Truck responses: W – E – L – F – S
26 Pressure sensor signal too high, and in particular over 9.5 V The return voltage signal of pressure sensor 1B10 is over 9.5 V.
--> window 61
Possible causes: defective pressure sensor, shorted cable loom to and from sensor Truck responses: W
27 Pressure switch and pressure sensor signals are both active
The switch and sensor signal at pressure sensor 1B10 are applied simultaneously.
Possible cause: defective pressure sensor Truck responses: W
28 Pressure switch active although engine speed is zero
A switch signal 1B10 is applied although IC engine was not started and therefore no RPM are indicated. --> window 6
Possible cause: pressure sensor defective, cable loom Truck responses: W
31 The voltage values of potentiometers 1B2.1 and 1B2.2 do not match, and neither is 0 V.
The values supplied by both potentiometers are not within the admissible tolerance range.
Possible cause: potentiometer
32 The voltage value of potentiometer 1B2.1 is either too low or too high.
The voltage value supplied by potentiometer 1B2.1 is not within the admissible range. It is either below 0.8 V or over 9.2 V. Check this value in window 6. For a setting of the maximum values see the description in window 6. If an adjustment can not be carried out successfully, the potentiometer could be defective.
Truck responses: W – B – L
33 The voltage value of potentiometer 1B2.2 is either too low or too high.
The voltage value supplied by potentiometer 1B2.2 is not within the admissible range.
Possible cause: potentiometer Truck responses: W – B – L
34 Both potentiometers 1B2.1 and 1B2.2 at 0 Volt
The voltage of approx. 10 Volt specified by the LHC box can not be processed further.
Possible causes: potentiometer not connected, potentiometer defective, cable loom Truck responses: W – B – L
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35 Travel direction signal encoding is not OK
The controller can not sense if it is a single-pedal or two-pedal vehicle.
Possible causes: encoding plug (near key switch); travel direction switch not connected or faulty, cable loom (negative signals to LHC box not present, check)
--> Window 4)
Truck responses: W – B – L 36 Signal from travel direction switch
A signal expected from the travel direction switch can not be detected.
Possible causes: travel direction switch, cable loom (check negative signals coming from travel direction switch to LHC box ) --> window 4
Truck responses: W – B – L
37 Brake switch 1 (1S5) breaker and maker have the same signal.
The brake switch does not change its outputs from 0 to 1 and from 1 to 0. --> window 4 Possible causes: brake switch defective, open connection (check negative signals coming from brake switch to LHC module)
Truck responses: W – B
38 Switching sequence of brake switch 1 (1S5) and brake switch 2 (S14) is not OK.
The controller first expects (operation of brake pedal) brake switch 1 (1S5), before brake switch 2 (S14) becomes active. --> window 4
Possible causes: both brake switch connectors interchanged; brake switch 1 (1S5) not connected, brake switch 1 defective; cable loom from brake switch 1 to LHC module
Truck responses: W – B
39 Seat switch breaker and maker have the same signal
The seat switch is activated --> window 72 and both output signals of the seat switch show the same value 00 or 11. --> window 4
Possible causes: seat switch is switched active but not connected; seat switch defective; open connection (seat switch - LHC module); cable loom
Truck responses: W – B – L
41 vs is under 8 Volt although vr is over 11 Volt
Supply voltage vs for the traction potentiometer is under 8 Volt, although supply voltage vr for the LHC module is over 11 Volt. --> window 6
Possible cause: voltage regulator in LHC module Truck responses: W – B – L
43 Controller without power
The LHC module is without supply voltage vr . --> window 6
Possible causes: fuse 1F18 defective; cable loom at LHC module not connected to positive and negative terminals.
Truck responses: W – B – L
44 Safety relay in the controller can no longer be switched off
Safety relay K1 in the LHC module (switched off briefly when the ignition key is turned) is sticking.
Possible cause: K1 relay in the LHC module is oxidized, sticking Truck responses: W – B – L
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45 Release valve can no longer be activated
Release valve 1Y4 can not be activated. --> window 5
Possible causes: open connection in cable loom to the release valve, release valve solenoid defective
Truck responses: W – B
46 Release valve can no longer be deactivated
Release valve 1Y4 was activated, but can no longer be deactivated.
--> window 5
Possible causes: LHC module defective; cable loom for release valve is permanently “+”
Truck responses: W – B
47 Current of release valve is too low
Release valve 1Y4 can not be activated --> window 5
Possible causes: inherent resistance of solenoid of valve 1Y4 is too large or solenoid not connected; cable loom
Truck responses: W – B
51 Current of solenoid for IC engine is too high
The vehicle detects too high a current value for solenoid iY1 to speed controller, over 1.8 A
--> window 6
Possible causes: short in solenoid iY1 or in cable loom to solenoid iY1 Truck responses: W – E – L – F – S
52 Current of solenoid for IC engine is too low
The vehicle detects too low a current value for solenoid iY1 to speed controller --> window 6 Possible causes: cable loom has an open connection to solenoid iY1, solenoid defective.
Truck responses: W – E – L – F – S
53 Current for pump forward solenoid is too high
Current value for proportional solenoid iY2 is too high. --> window 6 Causes: short in proportional solenoid iY2 or in cable loom to the solenoid Truck responses: W – E – L – F – S
54 Current for pump forwards solenoid is too low
The vehicle detects too low a current value for proportional solenoid iY2 --> Window 6
Possible causes: cable loom has an open connection to solenoid iY2, proportional solenoid defective
Truck responses: W – E – L – F – S
55 Current for pump reverse solenoid is too high
The current value for proportional solenoid iY3 is high --> window 6
Possible causes: short in proportional solenoid iY3 or in cable loom to the solenoid.
Truck responses: W – E – L – F –S
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56 Current for pump reverse solenoid is too low
The vehicle detects too low a current value for proportional solenoid iY3 --> window 6
Possible causes: cable loom has an open connection to solenoid iY3, proportional solenoid defective
Truck responses: W – E – L – F – S 57 Current for gas shutoff valve is too high
The current applied to gas shutoff valve solenoid 1Y5 is too high
Possible causes: short in/at gas shutoff valve solenoid 1Y5 or in the cable loom to the solenoid.
Truck response: W
58 Current for gas shutoff valve is too low
The vehicle detects too low a current value at the solenoid for gas shutoff valve 1Y5
Possible causes: cable loom has an open connection to solenoid 1Y5 of the gas shutoff valve or in the solenoid
Truck response: W 59 Status of release valve
The controller can not detect if release valve 1Y4 ( solenoid ) is activated or not.
Possible causes: release valve 1Y4 defective, cable loom Truck responses: W – B
61 Engine speed too high
This error code appears if the engine speed is over 3000 rpm for 10 seconds.
Possible causes: injection pump; proportional solenoid Truck response: W
62 Sudden change in RPM signal from over 800 to 0 rpm
The vehicle no longer detects any engine speed, although the engine was not shut down with the ignition key.
Possible causes: speed sensor 1B1 defective, cable loom to the speed sensor has an open connection
Truck response: W
65 Tilt pressure signal of 6 bar without RPM
The controller senses an active (closed) pressure switch 1S1 although no engine RPM exists --> window 4
Possible causes: pressure switch 1S1 defective, cable loom from pressure switch 1S1 is shorted 66 Lift pressure signal of 14 bar without RPM
The controller senses an activated (closed) pressure switch 1S2, although no engine RPM exists. --> window 4
Possible causes: pressure switch 1S2 defective, cable loom from pressure switch 1S2 shorted Truck response: W
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67 Lift and tilt signals incompatible (14 bar before 6 bar)
The normal switching sequence, first 1S1 then 1S2, is out of sequence. --> window 4 Possible causes: connectors of both pressure switches 1S1 and 1S2 are interchanged, pressure switch 1S1 defective, cable loom from pressure switch 1S1 has an open connection.
Truck responses: W
70 - 79 Mutual monitoring of both processors
The internal communication between the master and the safety processor is faulty.
Possible cause: LHC-module 1N2 defective Truck responses: W – E – L – F – S
80 - 99 Safety processor error messages
The safety processor is detecting errors in LHC module 1N2.
Possible cause: LHC module 1N2 defective Truck responses: W – E – L – F – S
NOTE: If there is a single error code between 70 - 99, the LHC module can be assumed to be defective.
If further codes under 70 are detected, these must be considered first.
NOTE: If there is no diagnostic output of module LHC 1N2 and/or the vehicle can not be started, and/
or the warning lamp is not on, LHC module 1N2 can be assumed to be defective if the following conditions are fulfilled:
- Fuse 1F17 and 1F18 are OK
- Power supply, positive and negative signals present
- Diagnostic cable (communications to the test module/ laptop) is OK
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