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DTC P2101: Throttle Actuator "A" Control Motor Circuit Range/Performance: Notes

WARNING: This page is about a different variant/trim than selected.

DTC detecting condition: 

Immediately at fault recognition

Trouble symptom: 

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Ref. to OPERATION , Clear Memory Mode., and Inspection Mode Ref. to PROCEDURE , Inspection Mode.

Wiring diagram: 

Engine Electrical System Ref. to WIRING DIAGRAM , Engine Electrical System.

Fig 1: Throttle Actuator "A" Control Motor Circuit Range/Performance Wiring Diagram
G11586576Courtesy of SUBARU OF AMERICA, INC.
Step Check Yes No
1 CHECK ELECTRONIC THROTTLE CONTROL RELAY. 
  1. Turn the ignition switch to OFF.
  2. Remove the electronic throttle control relay.
  3. Connect the battery to terminals No. 13 and No. 14 of electronic throttle control relay.
  4. Measure the resistance between electronic throttle control relay terminals.

    Terminals 

    No. 22 - No. 23: 

 Is the resistance less than 1 Ω? Go to step 2  . Replace the electronic throttle control relay. Ref. to ELECTRICAL COMPONENT LOCATION
2 CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL RELAY. 
Measure the voltage between electronic throttle control relay connector and chassis ground.
Connector & terminal 
(B48) No. 22 (+) - Chassis ground (-): 		 Is the voltage 10 V or more? Go to step 3  . Repair the open or short to ground in the power supply circuit.
3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. 
  1. Disconnect the connector from ECM.
  2. Turn the ignition switch to ON.
  3. Measure the voltage between electronic throttle control relay connector and chassis ground.

    Connector & terminal 

    (B48) No. 20 (+) - Chassis ground (-): 

 Is the voltage 10 V or more? Repair the short circuit to power in the harness between ECM connector and electronic throttle control relay. Go to step 4  .
4 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance between electronic throttle control relay connector and chassis ground.

    Connector & terminal 

    (B48) No. 20 - Chassis ground: 

    (B48) No. 23 - Chassis ground: 

 Is the resistance 1 MΩ or more? Go to step 5  Repair the short circuit to ground in harness between ECM connector and electronic throttle control relay.
5 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY. 
Measure the resistance between ECM connector and electronic throttle control relay connector.
Connector & terminal 
(B134) No. 13 - (B48) No. 23: 
(B134) No. 65 - (B48) No. 20: 		 Is the resistance less than 1 Ω? Go to step 6  . Repair the open circuit in harness between ECM connector and electronic throttle control relay.
6 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from electronic throttle control.
  3. Measure the resistance between ECM connector and chassis ground.

    Connector & terminal 

    (E158) No. 32 - Chassis ground: 

    (E158) No. 29 - Chassis ground: 

    (E158) No. 29 - (B158) No. 19: 

    (E158) No. 31 - Chassis ground: 

 Is the resistance 1 MΩ or more? Go to step 7  Repair the ground short circuit of harness between ECM connector and electronic throttle control connector.
7 CHECK SHORT CIRCUIT INSIDE THE ECM. 
  1. Connect the connector to ECM.
  2. Measure the resistance between electronic throttle control connector and engine ground.

    Connector & terminal 

    (E57) No. 6 - Engine ground: 

    (E57) No. 4 - Engine ground: 

 Is the resistance 200 kΩ or more? Go to step 8  Repair the ground short circuit of harness between ECM connector and electronic throttle control connector.
Replace the ECM if defective. Ref. to ENGINE CONTROL MODULE (ECM)
8 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. 
  1. Disconnect the connector from ECM.
  2. Measure the resistance of harness between ECM connector and electronic throttle control connector.

    Connector & terminal 

    (E158) No. 29 - (E57) No. 6: 

    (E158) No. 31 - (E57) No. 4: 

    (E158) No. 34 - (E57) No. 3: 

 Is the resistance less than 1 Ω? Go to step 9  Repair the open circuit of harness between ECM connector and electronic throttle control connector.
9 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. 
  1. Connect the connector to ECM.
  2. Measure the resistance between electronic throttle control connector and engine ground.

    Connector & terminal 

    (E57) No. 3 - Engine ground: 

 Is the resistance less than 5 Ω? Go to step 10  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit of harness between ECM connector and engine ground
  • Poor contact of ECM connector
10 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. 
  1. Turn the ignition switch to ON.
  2. Measure the voltage between electronic throttle control connector and engine ground.

    Connector & terminal 

    (E57) No. 6 (+) - Engine ground (-): 

    (E57) No. 4 (+) - Engine ground (-): 

 Is the voltage 5 V or more? Repair the short circuit to power in the harness between ECM connector and electronic throttle control connector. Go to step 11 
11 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance between ECM connectors.

    Connector & terminal 

    (E158) No. 32 - (E158) No. 29: 

    (E158) No. 32 - (E158) No. 31: 

 Is the resistance 1 MΩ or more? Go to step 12  Repair the short circuit to power in the harness between ECM connector and electronic throttle control connector.
12 CHECK SENSOR OUTPUT. 
  1. Connect all connectors.
  2. Start the engine and warm up completely.
  3. Stop the engine, and turn the ignition switch to ON. (Engine OFF)
  4. Read the value of «Main-Throttle Sensor» using Subaru Select Monitor.
    NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to SUBARU SELECT MONITOR
 Is the value of «Main-Throttle Sensor» 0.81 - 0.87 V? Go to step 13  Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Ref. to THROTTLE BODY
13 CHECK SENSOR OUTPUT. 
Read the value of «Sub-Throttle Sensor» using Subaru Select Monitor.
NOTE: For detailed operation procedures, refer to "Current Data Display For Engine". Ref. to SUBARU SELECT MONITOR
 Is the value of «Sub-Throttle Sensor» 1.64 - 1.70 V? Go to step 14  . Repair the poor contact of electronic throttle control connector. Replace the electronic throttle control if defective. Ref. to THROTTLE BODY
14 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Disconnect the connectors from electronic throttle control.
  4. Measure the resistance between ECM connector and electronic throttle control connector.

    Connector & terminal 

    (E158) No. 1 - (E57) No. 1: 

    (E158) No. 14 - (E57) No. 2: 

 Is the resistance less than 1 Ω? Go to step 15  . Repair the open circuit of harness between ECM connector and electronic throttle control.
15 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. 
  1. Connect the connector to ECM.
  2. Turn the ignition switch to ON.
  3. Measure the voltage between electronic throttle control connector and engine ground.

    Connector & terminal 

    (E57) No. 2 (+) - Engine ground (-): 

    (E57) No. 1 (+) - Engine ground (-): 

 Is the voltage 5 V or more? Repair the short circuit to power in the harness between ECM connector and electronic throttle control. Go to step 16  .
16 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL MOTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ECM.
  3. Measure the resistance between electronic throttle control connector and engine ground.

    Connector & terminal 

    (E57) No. 2 - Engine ground: 

    (E57) No. 1 - Engine ground: 

 Is the resistance 1 MΩ or more? Go to step 17  Repair the short circuit to ground in harness between ECM connector and electronic throttle control.
17 CHECK ELECTRONIC THROTTLE CONTROL MOTOR HARNESS. 
Measure the resistance between electronic throttle control connectors.
Connector & terminal 
(E57) No. 2 - (E57) No. 1: 		 Is the resistance 1 MΩ or more? Go to step 18  . Repair the short circuit in harness between ECM connector and electronic throttle control.
18 CHECK ELECTRONIC THROTTLE CONTROL GROUND CIRCUIT. 
Measure the resistance between ECM connector and chassis ground.
Connector & terminal 
(E158) No. 60 - Chassis ground: 
(E158) No. 61 - Chassis ground: 
(E158) No. 62 - Chassis ground: 
(E158) No. 63 - Chassis ground: 
(E158) No. 64 - Chassis ground: 
(E158) No. 65 - Chassis ground: 		 Is the resistance less than 5 Ω? Go to step 19  Repair the open circuit in harness between ECM connector and engine ground.
19 CHECK ELECTRONIC THROTTLE CONTROL. 
Measure the resistance between electronic throttle control terminals.
Terminals 
No. 2 - No. 1: 		 Is the resistance 50 Ω or less? Go to step 20  . Replace the electronic throttle control. Ref. to THROTTLE BODY
20 CHECK ELECTRONIC THROTTLE CONTROL. 
Move the throttle valve to the fully opened and fully closed positions with fingers.
Check that the valve returns to the specified position when releasing fingers.		 Does the valve return to the specified position? Specified value: 3 mm (0.12 in) from fully closed position Repair the poor contact of ECM connector. Replace the electronic throttle control. Ref. to THROTTLE BODY
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