Wednesday, November 12, 2025

How to Solve AGCO DTB DT205B Trouble Code D121 Error Code?

This instruction show you guide on how to solve AGCO tractor DTB DT205B trouble code D121.

The alternator voltage regulator voltage is too high (filtered battery signal) (X55).

 

Related Contents:

AGCO 2×4 CANUSB

AGCO EDT Electronic Diagnostic Tool




Possible causes

The filtered battery supply voltage is above 15.5 V

The alternator voltage regulator is faulty

The instrument panel voltage filter system is faulty



Consequences

There is a risk of overvoltage causing damage to the tractor electrical components.



D121 error code: diagnostic file

Check fuses F38 and F12.
Checking the voltage supplied by the two alternators

Test the voltage between terminal 1 of connector X192 or terminal 1 of connector X193 and the earth.



Note: 
For more information about the alternator test, refer to the workshop manual.

Erase any errors in the instrument panel and check that the error code does not re-appear.

Change the alternator voltage regulator. Repair the electrical fault if necessary.

Replace the instrument panel. The condenser inside the instrument panel may be faulty.


Note: 
Before replacing the instrument panel, check to make sure that the two voltage input terminals for the instrument panel are correct. Terminal 1 of connector X55 is connected to a + supply when the ignition is switched on. Terminal 68 of connector X55 is connected to a permanent + supply.


Carry out a test, while checking to ensure that the error code does not re-appear. 


 

Wednesday, October 29, 2025

Deutz Engine EMR3 75/190 Crankschaft Speed Sensor No Signal

Here is the instruction show  you guide on how to solve Deutz Engine EMR3 75 / 190 / Crankschaft speed sensor.


Error Description

ENGINE SPEED
Crankschaft speed sensor: the ECU receives no signal and uses the signal from camschaft speed sensor as alternative to calculate the engine speed .

 

Deutz Tool

Deutz DECOM

Deutz Serdia 4.0


 

Error Codes
DEUTZ-Errorcode: 75
BlinkCode (short-long-short): 2 - 1 - 2
SPN: 190 

Possible FMI:
12. Errormode not identifiable
12: Defective component
12. Errormode not identifiable
12. Errormode not identifiable 


Error Detection
Errorlamp shows permanent light. Entry in errormemory. 


Possible reason for error

Engine running only with cam-shaft speed signal, transmitter defective, connection cable demaged
 

Take actions for error repair
Check cabling of crankschaft sensor, check crankschaft sensor and if necessary replace it, check connection cable and if necessary repair or replace it other error properties
 

System reaction:

Warning, calculation of injektion initation point will be incorrect
Behaviour error lamp: permanent light
Selfhealing: yes
Signal Priority: 3
Measurement @ errort

https://www.car-auto-repair.com  

Thursday, October 16, 2025

ISUZU N-Series 4JJ1 3.0L 2018 P06A3 Trouble Repair Solution

This instruction show you guide on how to solve ISUZU N-series 4JJ1 3.0L 2018 truck DTC P06A3 trouble solution.

The 5 volts reference circuit 4 is internal circuit of ECM.

 

Related Contents:

NEXIQ USB Link 3

ISUZU US-IDSS 2025

 

CONDITION FOR RUNNING THE DTC:

The ignition switch is ON.

 

CONDITION FOR SETTING DTC:

Either Of the Following Conditions Is Met:

1. The ECM detects that the 5 volts reference circuit 4 voltage is less than 4.8 volts.

2.The ECM detects that the 5 volts reference circuit 4 voltage is more than 5.2 volts.

 

ACTION TAKEN WHEN THE DTC SETS:

1. The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

2. The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Freeze Frame/Failure Records.

 

The ECM Apply Defaulted Warning Action And Fail-Safe Controls:

1. MIL:ON

2. Reduced Engine Power Indicator Lamp:ON

3. Cruise Control Inhibition

 

CONDITION FOR CLEARING THE DTC:

1 The ECM turns OFF the MIL after 3 consecutive driving cycles when the diagnostic runs and does not fail.

2 A current DTC clears when the diagnostic runs and passes.

3 A history DTC clears after 40 consecutive warm-up cycles,if no failures are reported after the ECM turns OFF the MIL

4 Use the diagnostic tool to clear the MIL and the DTC.

 

https://www.car-auto-repair.com

Monday, September 29, 2025

How to Select ECM in CAT ET Diagnostic Software?

CAT ET 2025A Select ECM menu function is only available when more than one ECM is connected to the service tool. This function allows ECM that the service tool targets as the current ECM to be selected. The service tool's menus and functionality is based on this current ECM. The name of the current ECM displays in the right corner of the status bar.

 

CAT ET 2025A

Cat comm3 adapter

Instructions
To select the ECM:

Select the “Select ECM” option from the File menu. 

The ECM Selector dialog box is displayed. 
This dialog box displays a list of the ECMs currently available on the data link. 

Next to each of the ECM names, in the Select an ECM list box, there is an icon. If the icon shows a connection, then the ECM is currently communicating. 

If the icon shows a disconnection, then the ECM is not serviceable. 
Highlight an ECM, and click OK. The ECM Summary screen for the selected ECM is displayed. 
Note: If the ECM is not serviceable, the "Switch Data Link" button displays.

https://www.car-auto-repair.com


Thursday, September 18, 2025

John Deere PowerTech 9.0L Engine Piston Cooling Orifices Installation Guide

This instruction show you guide on how to install piston cooling orifices for John Deere PowerTech 9.0L engine.

 

Related Contents:

John Deere EDL V2

John Deere ServiceAdvisor 

 

1. Use a soft wire and compressed air to clean orifices. Replace if condition is questionable.
 

IMPORTANT: A piston cooling orifice failure could  cause damage to pistons, piston pins, rod pin
bushings, and liners. If a piston cooling orifice  is left out, low or no oil pressure will result.
 

IMPORTANT: The 9 L engine has directed oil piston  cooling. Be certain orifice is installed in
proper orientation to liner bore.
2. Locate JDG1948 piston cooling orifice installation tool  (A) in main bearing diameter.
 

3. Coat 12 mm (1/2 in.) of piston cooling orifice with
LOCTITE® Threadlocker medium strength 242 (Blue), as shown.
 

NOTE: Installation tool and cooling orifice have matching surfaces to properly align orifice in
block. If surfaces are not aligned, the installation  screw can not be started.
 

4. Install piston cooling orifice (B) in block from liner  side, as shown. When tool and orifice are in proper alignment, the installation screw (C) will be in an up  position.
5. Assemble installation screw into cooling orifice with  fingers. This will begin to seat cooling orifice in block.
6. Tighten installation screw to specification to seat  orifice in block.
 

Specification
Piston Cooling Orifice into
Cylinder Block—Torque................................... 15—17 N·m (11—13 lb-ft)
 

7. Verify installation depth by removing screw (C) from installation tool. Reassemble screw loosely in
installation tool. The ring on the screw shank (D) should be even with or above top surface of tool. 

https://www.car-auto-repair.com 

Thursday, September 4, 2025

FENDT 900 Vario COM III Tractor Transmission System Setting and Calibrating

Here is the instruction show you guide on how to set and calibrate transmission system for Fendt 900 Vario COM III tractors. 


Related Contents:

FENDT Fendias 2024 Diagnostic software

AGCO 2x4 CANUSB



If necessary: unlock brake pedals, set individually.
Place shims between buffer (1) and brake pedal (2) to provide a space of 3 mm.
This corresponds to a pedal travel of approx. 11 mm.
Connect X899.980.246.206 adapter cable only to S005 - Switch, right brake.
Connect multimeter (ohmmeter) to pin 3 and pin 4.
Push magnet (4) towards S005 - Switch, right brake until the ohmmeter displays a resistance of approx. 121 ohms (switch closed) Screw magnet (4) tight.



Remove shims (3 mm) from between the buffer (1) and the brake pedal (2).
N OTE: The setting for S006 - Switch, left brake is carried out in the same way
Checking setting of magnet for S005/S006 switch
Measure pin 3 and 4 with multimeter (ohmmeter).


Unlock brake pedals.
Brake pedal in rest position (solenoid switch closed).
(resistance approx. 121 ohms)
Slowly operate single wheel brake (the solenoid switch must open).
After the brake pedal has travelled approx. 28 mm, the S005 - Switch, right brake opens (resistance approx. 510 ohms).
When the brake pedal returns to its rest position, the S005 - Switch, right brake must close no later than 5 mm before the pedal reaches its rest position (resistance approx. 121 ohms)
N OTE: The check for the S006 - Switch, left brake is carried out in the same way.

https://www.car-auto-repair.com 

Thursday, August 14, 2025

JCB 3CX,4CX,214,215,217 Stabiliser Controls Removal and Replacement Guide

This instruction show you guide on how to remove and replace stabiliser controls for JCB 3CX,4CX,214,215,217. 

 


Stabiliser Controls
The stabiliser controls A and associated cables are housed in the R.H. side console as shown.
There are two control cables which operate the R.H. and L.H. stabiliser control valves on the excavator valve block.

Note the routing of the existing cables and route the new cable(s) in the same way.

JCB DLA Diagnostic tool

JCB ServiceMaster 4 2025 

JCB EPC Parts catalogue 

How to Solve AGCO DTB DT205B Trouble Code D121 Error Code?

This instruction show you guide on how to solve AGCO tractor DTB DT205B trouble code D121. The alternator voltage regulator voltage is too h...