DTC Troubleshooting: P2101
DTC P2101: ETCS Malfunction
Do not insert your fingers into the installed throttle body when you press the engine start/stop button to select the ON mode, or while the vehicle is in the ON mode. If you do, you will seriously injure your fingers if the throttle valve is activated.

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2101 ETCS Malfunction
      

1.
ETCS system check:

ETCS system check
?1.
Press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Select the ETCS TEST in the INSPECTION MENU with the HDS.

  

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2101 ETCS Malfunction
      

Is DTC P2101 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 3.
     
NO
     
     
     
The failure is not duplicated. Go to step 2.
2.
Problem verification:

Problem verification
?1.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
ENGINE SPEED
VEHICLE SPEED
APP SENSOR

Signal
Current conditions
Values
Unit
ENGINE SPEED
    
VEHICLE SPEED
    
APP SENSOR
    

?2.
Check for Pending or Confirmed DTCs with the HDS.


Is DTC P2101 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 3.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.?
3.
Determine possible failure area (throttle body, others):

Determine possible failure area (throttle body, others)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the intake air duct from the throttle body.

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

?4.
Clear the DTC with the HDS.


?5.
Visually check the throttle valve operation while doing the ETCS TEST in the INSPECTION MENU with the HDS.

  

Does the throttle valve operate smoothly?

     
YES
     
     
     
     
NO
     
     
     
Go to step 4.
4.
Open wire check (SG5 line):

Open wire check (SG5 line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connectors.

?4.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
Throttle body 6P connector: disconnected
 
PCM connector B (51P): disconnected
Test circuit
SG5
Test point 1
Throttle body 6P connector No. 3 (GRN)
Test point 2
PCM connector B (51P) No. 46 (GRN)


Is there continuity?

     
YES
     
     
     
The SG5 wire is OK. Go to step 5.
     
NO
     
     
     
Repair an open in the SG5 wire between the throttle body and the PCM (B46), then do the repair verification.
5.
Open wire check (MTR1 line, MTR2 line):

Open wire check (MTR1 line, MTR2 line)
?1.
Disconnect the following connector.

?2.
Connect terminals A and B with a jumper wire.
Terminal A
Throttle body 6P connector No. 1 (LT BLU)
Terminal B
Throttle body 6P connector No. 2 (WHT)


?3.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
 
PCM connector B (51P): disconnected
 
PCM connector C (51P): disconnected
 
Throttle body 6P connector: disconnected
 
Throttle body 6P connector No. 1 and No. 2: jumped
Test circuit
MTR1, MTR2
Test point 1
PCM connector C (51P) No. 2 (LT BLU)
Test point 2
PCM connector C (51P) No. 3 (WHT)


Is there continuity?

     
YES
     
     
     
The MTR1 and MTR2 wires are OK. Go to step 6.
     
NO
     
     
     
Repair an open in the MTR1 wire or the MTR2 wire between the PCM (C2, C3) and the throttle body, then do the repair verification.
6.
Throttle body internal circuit check:

Throttle body internal circuit check
?1.
At the throttle body side, measure the resistance between test points 1 and 2.
Test condition
OFF mode
 
PCM connector B (51P): disconnected
 
PCM connector C (51P): disconnected
 
Throttle body 6P connector: disconnected
Test circuit
MTR1, MTR2
Test point 1
Throttle body 6P connector No. 1 (throttle body side)
Test point 2
Throttle body 6P connector No. 2 (throttle body side)


Is there about 1.0 k? or more?

     
YES
     
     
     
     
NO
     
     
     
The throttle body internal circuit is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.
Repair verification:

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

?2.
Reconnect all connectors.

?3.
Exit the SCS mode with the HDS.


?4.
Press the engine start/stop button to select the ON mode.

?5.
Reset the PCM with the HDS.


?6.
Do the PCM idle learn procedure.

?7.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:
ENGINE SPEED
VEHICLE SPEED
APP SENSOR

Signal
Current conditions
Values
Unit
ENGINE SPEED
    
VEHICLE SPEED
    
APP SENSOR
    

?8.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P2101 ETCS Malfunction
      


Is DTC P2101 indicated?

     
YES
     
     
     
Check for poor connections or loose terminals at the throttle body and the PCM, and clean the throttle body, then go to step 1. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.
     
NO
     
     
     
Troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.?