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. Select the ETCS (TAC) TEST in the Function Test Menu with the HDS.

   ETCS (TAC) TEST

   Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC
   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 on-board snapshot parameters:

   • ENGINE SPEED
   • VEHICLE SPEED
   • APP SENSOR

   On-board Snapshot

   Signal	Current conditions
   	Values	Unit
   ENGINE SPEED
   VEHICLE SPEED
   APP SENSOR

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

   DTC Description	Confirmed DTC	Pending DTC
   P2101 ETCS Malfunction

   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 on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the 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 (TAC) TEST in the Function Test Menu with the HDS.

   ETCS (TAC) TEST

   Does the throttle valve operate smoothly?

   YES 

   Clean the throttle body . If DTC P2101 is indicated again, 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, and wait more than 1 minute.

   -3. Disconnect the following connectors.

   PCM connector E (80P)

   Throttle body 6P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector E (80P): disconnected
   	Throttle body 6P connector: disconnected
   Test point 1	Throttle body 6P connector (female terminals) No. 3:
   Test point 2	PCM connector E (80P) No. 67

   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 PCM (E67) and the throttle body.

5. Open wire check (MTR1 line, MTR2 line)

   -1. Connect terminals A and B with a jumper wire.

   Terminal A	Throttle body 6P connector (female terminals) No. 1:
   Terminal B	Throttle body 6P connector (female terminals) No. 2:

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

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

   Test condition

   Vehicle OFF (LOCK) mode

   	PCM connector E (80P): disconnected
   	Throttle body 6P connector: disconnected
   	Throttle body 6P connector No. 1 and No. 2: jumped
   Test point 1	PCM connector E (80P) No. 12
   Test point 2	PCM connector E (80P) No. 13

   Is there continuity?

   YES 

   The MTR1 wire and the MTR2 wire are OK. Go to step 6.

   NO 

   Repair an open in the MTR1 wire or the MTR2 wire between the PCM (E12, E13) and the throttle body.

6. Throttle body internal circuit check

   -1. Remove the jumper wire from the throttle body 6P connector.

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

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector E (80P): disconnected
   	Throttle body 6P connector: disconnected
   Test point 1	Throttle body 6P connector (male terminals) No. 1 (throttle body side):
   Test point 2	Throttle body 6P connector (male terminals) 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. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM , then recheck. If DTC P2101 goes away and the PCM was substituted, replace the original PCM .