ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P2102 THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

• Engine stalls.

CAUTION:

After repairing or replacing the defective part, perform the Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

STEPCHECKYESNO

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. 1 and No. 3 of electronic throttle control relay.

4) Measure the resistance between electronic throttle control relay terminals.

Terminals

No. 2 — No. 4:

Is the resistance less than 1 Ω?

Replace the electronic throttle control relay.

2.CHECK POWER SUPPLY OF ELECTRONIC THROTTLE CONTROL RELAY.

1) Turn the ignition switch to ON.

2) Measure the voltage between electronic throttle control relay connector and chassis ground.

Connector & terminal

(B309) No. 1 (+) — Chassis ground (−):

(B309) No. 2 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Repair the open or ground short circuit of power supply circuit.

3.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL RELAY.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from the ECM.

3) Turn the ignition switch to ON.

4) Measure the voltage between electronic throttle control relay connector and chassis ground.

Connector & terminal

(B309) No. 3 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Repair the short to power supply in harness between ECM and electronic throttle control relay.

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

(B309) No. 3 — Chassis ground:

(B309) No. 4 — Chassis ground:

Is the resistance 1 MΩ or more?

Repair the ground short circuit of harness between ECM 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

(B135) No. 6 — (B309) No. 3:

(B136) No. 1 — (B309) No. 4:

(B136) No. 2 — (B309) No. 4:

Is the resistance less than 1 Ω?

Repair the poor contact of ECM connector. Replace the ECM if defective.

Repair the open circuit of harness between ECM and electronic throttle control relay.