1) Yuchai unit pump R01/R02
Diagnostic location: in front of the co-pilot/in the relay box/near ECU/above the accelerator pedal/near the instrument panel/in the fuse box near the left front wheel, etc.;
Diagnosis seat shape and configuration:
Shape: Flat 4-pin -> AK-35 is recommended;
Configuration: power cord (1), ground wire (1 or), signal wire (2);
Note: The definition of the diagnostic interface has nothing to do with color and wiring sequence.
Diagnostic line identification method:
1.CAN high: 2.6V; CAN low: 2.4V;
2.The resistance between the two: 120 ohms (the amount of key off);
testing method:
When using the AK-35 universal connector, please use a cigarette lighter to get electricity;
2) DELPHI system of Dachai unit pump
Diagnosis location: inside the relay box, above the accelerator pedal, near the instrument panel, etc.;
System identification note:
1. Please use this system to diagnose trucks, and use the Motorola system to diagnose special vehicles (crane);
Diagnosis seat shape and configuration:
1. Round 16PIN->use AK-32;
Configuration: power cord (1), ground wire (1), signal wire (2, 11/12 position);
2. Square standard OBD-> use AK-02/28;
Configuration: power cord (1), ground wire (1 or 2), signal wire (2, 6/14 position);
Diagnostic line identification method:
1.CAN high: 2.6V; CAN low: 2.4V;
2.The resistance between the two: 120 ohms (the amount of key off);
testing method:
1. Use AK-32 or AK-02 directly;
2. When using the AK-35 universal connector, please use a cigarette lighter to get electricity;
3) Jiangling, Baostone Delphi
Diagnosis location: inside the relay box, above the accelerator pedal, near the instrument panel, between the driver and co-driver, etc.;
Diagnosis seat shape and configuration:
1. Square standard OBD-> use AK-02/28;
Configuration: power cord (1), ground wire (1 or 2), signal wire (1, No. 7 position);
2. Round 16PIN->use AK-33;
Configuration: power cord (1), ground wire (1), signal wire (1, 8th position);
Note: Pay attention to the difference between WABCO’s ABS diagnostic interface and WABCO’s diagnostic interface on buses.
Diagnostic line identification method:
1. Check the normal power supply voltage on the vehicle;
2. The signal line on the diagnostic interface is generally about 1V lower than the normal power supply;
3.BOSCH EDC7 ECU is mostly No. 89 signal line, EDC16 ECU is mostly No. 25 signal line.
testing method:
1. Use AK-02/28 or AK-33 directly;
2. When using the AK-35 universal connector (K_LINE is K line), please use a cigarette lighter to get electricity;
3. The EDC7 signal line is No. 89, and EDC16 is mostly No. 25 signal line. Please note that the ECU and the diagnostic instrument have the same power supply;
4) Yuchai unit pump Delphi system
Diagnosis location: in front of the co-pilot/in the relay box/above the accelerator pedal/near the instrument panel/in the fuse box near the left front wheel, etc.;
Diagnosis seat shape and configuration:
1. Square standard OBD-> use AK-02/28;
Configuration: power cord (1), ground wire (1 or 2), signal wire (1, No. 7 position);
2. Flat 3-pin -> use AK-35;
Configuration: power cord (1), ground wire (1 or 2), signal wire (1);
Diagnostic line identification method:
1. Normal power supply on the car: 24V, ECU power supply: 12V or 24V, so please pay attention to the voltage difference between the signal line and the power supply;
2. The signal line on the diagnostic interface is generally about 1V lower than the ECU power supply;
3.DELPHI (Delphi) ECU: No. 2.31 signal line.
testing method:
1. Use AK-02/28 directly;
2. When using the AK-35 universal connector (K_LINE is K line), please use a cigarette lighter to get electricity;
3.DELPHI ECU: Signal wire No. 2.31, please note that the ECU and the diagnostic instrument have the same power supply;
