Operator`s manual
OBD 171
43.0 AHC (ACTIVE HEIGHT CONTROL 
SUSPENSION) 
The M-OBD AHC system provides enhanced diagnostic functions and procedures. The 
M-OBD AHC system is diagnosed using the Tester connected to DLC3. Please verify the 
correct vehicle connection. For Operating Procedures for the Data List, DTC Info, Active 
Test, and Snapshot functions, please refer to Section 4.0: M-OBD Functions. 
ACTIVE KEYS 
u dq Change to next/previous menu item. 
1 - 5, 7 Select menu item. 
E  Select highlighted menu item. 
X  Return to the previous menu. 
HEIGHT CONTROL TEST
Press 5 to select <HEIGHT CTL TEST> from the <DIAGNOSTIC MENU>. The 
Height Control function is used to perform an active test on the height control function of 
the suspension system. Please reference the Service Manual for the Height Control 
procedures. For the control of the active test, please refer to Section 4.0: M-OBD 
Functions. 
ACTIVE KEYS 
u dq  Change to next/previous menu item. 
1, 2 Select menu item. 
E  Select highlighted menu item. 
X Return to the previous menu. 
SIGNAL CHECK 
Press 7 to select <SIGNAL CHECK> from the <DIAGNOSTIC MENU>. The Signal 
Check function is used to check the AHC sensor signals. Refer to the diagnostic section of 
the Repair Manual before performing this function. 
<ALL SIGNAL CHECK> Check all sensor signals. 
<ONE SIGNAL CHECK>  Check one selected sensor signal. 
ACTIVE KEYS 
u dq  Change to next/previous menu item. 
1, 2 Select menu item. 
E  Select highlighted menu item. 
X  Return to the previous menu. 










