DTC Troubleshooting: C1644-12
DTC C1644-12: Left-Front Stroke Sensor Upper Limit Abnormality
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
C1644-12 Left-Front Stroke Sensor Upper Limit Abnormality
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

?4.
Wait for 60 seconds or more.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
C1644-12 Left-Front Stroke Sensor Upper Limit Abnormality
    

Is DTC C1644-12 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
2.
Shorted wire check (ADJ SNSR FR SIG line to power):

Shorted wire check (ADJ SNSR FR SIG line to power)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Adaptive damper control unit 24P connector
Left-front suspension stroke sensor 3P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Adaptive damper control unit 24P connector: disconnected
 
Left-front suspension stroke sensor 3P connector: disconnected
Test point 1
Adaptive damper control unit 24P connector No. 24
Test point 2
Body ground

Is there about 5 V or more?

     
YES
     
     
     
Repair a short to power in the wire between the left-front suspension stroke sensor and the adaptive damper control unit.?
     
NO
     
     
     
The ADJ SNSR FR SIG wire is OK. Go to step 3.
3.
Open wire check (ADS SG line):

Open wire check (ADS SG line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Adaptive damper control unit 24P connector: disconnected
 
Left-front suspension stroke sensor 3P connector: disconnected
Test point 1
Adaptive damper control unit 24P connector No. 15
Test point 2
Left-front suspension stroke sensor 3P connector (female terminals) No. 1:


Is there continuity?

     
YES
     
     
     
The ADS SG wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open in the wire between the left-front suspension stroke sensor and the adaptive damper control unit.?
4.
Adaptive damper control unit check:

Adaptive damper control unit check
?1.
Substitute a known-good adaptive damper control unit.

?2.
Reconnect all connectors.

?3.
Turn the vehicle to the ON mode.

?4.
Clear the DTC with the HDS.


?5.
Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

?6.
Wait for 60 seconds or more.

?7.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
C1644-12 Left-Front Stroke Sensor Upper Limit Abnormality
    

Is DTC C1644-12 indicated?

     
YES
     
     
     
     
NO