DTC Troubleshooting: P0AB7
DTC P0AB7: Rear Engine Mount Actuator Control Circuit Low Current
NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshots, and review the general troubleshooting information.
When testing the rear engine mount actuator, be sure to use a Digital volt/ohm meter (DVOM) capable of reading 0.01 ohms change of resistance.
Be sure to zero the meter before checking the rear engine mount actuator.
If the vehicle has been driven, allow the rear engine mount actuator to cool down for about 2 hours before testing.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0AB7 Rear Engine Mount Actuator Control Circuit Low Current
      

1.
Problem verification:

Problem verification
?1.
Press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine, and let it idle 20 seconds.

?4.
Check for pending or confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0AB7 Rear Engine Mount Actuator Control Circuit Low Current
      

Is DTC P0AB7 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the engine mount control unit and the rear engine mount actuator, the engine mount control unit, and ground G401.?
2.
Rear engine mount actuator check:

Rear engine mount actuator check
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
At the rear engine mount actuator side, measure the resistance between test points 1 and 2.
NOTE: Zero-out the meter before testing to adjust the meter to the test leads.

Test condition
OFF mode
Rear engine mount actuator 2P connector: disconnected
Test circuit
RR ACM SOL+, RR ACM SOL-
Test point 1
Rear engine mount actuator 2P connector No. 1
Test point 2
Rear engine mount actuator 2P connector No. 2


Is there about 1.37?1.51 ? (68 °F/20 °C)?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Replace the rear engine mount, then do the repair verification.
3.
Open wire check (GND line):

Open wire check (GND line)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
Rear engine mount actuator 2P connector: disconnected
Engine mount control unit 16P connector: disconnected
Test circuit
GND
Test point 1
Engine mount control unit 16P connector No. 4 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Repair an open in the GND wire between engine mount control unit 16P connector terminal No. 4 and ground G401, then do the repair verification.
4.
Shorted wire check (RR ACM SOL+, RR ACM SOL- lines):

Shorted wire check (RR ACM SOL+, RR ACM SOL- lines)
?1.
Check for continuity between test points and body ground individually.
Test condition
OFF mode
Rear engine mount actuator 2P connector: disconnected
Engine mount control unit 16P connector: disconnected

Connector
Test circuit
Terminal
Engine mount control unit 16P connector
RR ACM SOL+
No. 2 (WHT)
RR ACM SOL-
No. 1 (BLU)


Is there continuity at one or both testing positions?

     
YES
     
     
     
Repair a short to ground in the wire between the engine mount control unit and the rear engine mount actuator, then do the repair verification.
     
NO
     
     
     
Go to step 5.
5.
Open wire check (RR ACM SOL+, RR ACM SOL- lines):

Open wire check (RR ACM SOL+, RR ACM SOL- lines)
?1.
Connect terminals A and B individually with jumper wires.
Terminal A
Rear engine mount actuator 2P connector No. 1 (WHT)
Terminal B
Rear engine mount actuator 2P connector No. 2 (BLU)


?2.
Check for continuity between test points and body ground individually.
Test condition
OFF mode
Rear engine mount actuator 2P connector: disconnected
Engine mount control unit 16P connector: disconnected
Rear engine mount actuator 2P connector terminal
No. 1: jumped to body ground
Rear engine mount actuator 2P connector terminal
No. 2: jumped to body ground

Connector
Test circuit
Terminal
Engine mount control unit 16P connector
RR ACM SOL+
No. 2 (WHT)
RR ACM SOL-
No. 1 (BLU)


Is there continuity at both testing positions?

     
YES
     
     
     
Check for poor connections or loose terminals at the engine mount control unit and the rear engine mount actuator. If it is OK, replace the engine mount control unit, then do the repair verification.
     
NO
     
     
     
Repair an open in the RR ACM SOL+ wire and/or RR ACM SOL- wire between the engine mount control unit and the rear engine mount actuator, then do the repair verification.
Repair verification:

?1.
Press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Press the engine start/stop button to select the ON mode.

?4.
Clear the DTC with the HDS.


?5.
Start the engine, and let it idle 20 seconds.

?6.
Check for pending or confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0AB7 Rear Engine Mount Actuator Control Circuit Low Current
      


Is DTC P0AB7 indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at the engine mount control unit and the rear engine mount actuator, then go to step 1.
     
NO
     
     
     
Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?