DTC P2101

DTC P2101  : ETCS Malfunction

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. ETCS system check

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Do the ETCS TEST with the HDS.

   DBW (ETCS) TEST

   -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:

   -1. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters:

   • ENGINE SPEED
   • VEHICLE SPEED
   • APP SENSOR

   Freeze Data

   Signal	Current conditions
   	Values	Unit
   ENGINE SPEED
   VEHICLE SPEED
   APP SENSOR

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

   DTC (PGM-FI)

   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. 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 .

3. Determine possible failure area (throttle body, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

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

   -3. Turn the vehicle to 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.

   DBW (ETCS) TEST

   Does the throttle valve operate smoothly?

   YES 

   Clean the throttle body . If DTC P2101 is indicated, replace the throttle body .

   NO 

   Go to step 4.

4. Open wire check (SG3 line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS.

   -3. Disconnect the following connectors.

   PCM connector C (51P)

   Throttle body 6P connector

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector C (51P): disconnected
   	Throttle body 6P connector: disconnected
   Test point 1	Throttle body 6P connector No. 3
   Test point 2	PCM connector C (51P) No. 16

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The SG3 wire is OK. Go to step 5.

   NO 

   Repair an open in the SG3 wire between the throttle body and the PCM (C16).

5. Open wire check (MTR 1 line, MTR 2 line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Connect terminals A and B with a jumper wire.

   Terminal A	Throttle body 6P connector No. 1
   Terminal B	Throttle body 6P connector No. 2

   Courtesy of HONDA, U.S.A., INC.

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector C (51P): disconnected
   	Throttle body 6P connector: disconnected
   	Throttle body 6P connector No. 1 and No. 2: jumped
   Test point 1	PCM connector C (51P) No. 3
   Test point 2	PCM connector C (51P) No. 4

   Is there continuity?

   YES 

   The MTR 1 and MTR 2 wires are OK. Go to step 6.

   NO 

   Repair an open in the MTR 1 wire or the MTR 2 wire between the PCM (C4, C3) and the throttle body.

6. Throttle body internal circuit check

   -1. At the throttle body side, measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector C (51P): disconnected
   	Throttle body 6P connector: disconnected
   Test point 1	Throttle body 6P connector No. 1 (throttle body side)
   Test point 2	Throttle body 6P connector No. 2 (throttle body side)

   Courtesy of HONDA, U.S.A., INC.

   Is there about 1.0 kΩ or more?

   YES 

   Replace the throttle body .

   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 recheck. If DTC P2101 goes away and the PCM was updated, troubleshooting is complete. If DTC P2101 goes away and the PCM was substituted, replace the original PCM .