Nissan Sentra B18 (2020-2025) Service Manual: P2103 Throttle Control Motor Relay

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P2103 Throttle Control Motor Relay

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P2103	ETC MOT PWR-B1 (Throttle actuator “A” control motor circuit high)	Diagnosis condition	Ignition switch ON
		Signal (terminal)	Throttle control motor relay signal
		Threshold	ECM detect the throttle control motor relay is stuck ON
		Diagnosis delay time	—

POSSIBLE CAUSE

Harness or connectors (Throttle control motor relay circuit is open.)
Throttle control motor relay

FAIL-SAFE

Engine Control System

Engine operating condition in fail-safe mode
Fail safe mode		Nissan Sentra Vehicle behavior
Device fix mode		This mode fixes the electric IVT motor and the EVT control solenoid valve in the reference position. The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).
Others		ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

Idle Start/Stop System

When a DTC is detected, the start/stop indicator lamp blinks slowly and the idle start/stop system operation is prohibited.

When ECM detects error while operating the idle start/stop system, ECM restarts the engine.

Confirmation Procedure

Confirmation Procedure

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

Witch DTC is detected?
P2100>>
GO TO 2.
P2103>>
GO TO 3.
PERFORM DTC CONFIRMATION PROCEDURE-DTC P2100
1. Turn ignition switch ON and wait at least 2 seconds.
2. Start engine and let it idle for 5 seconds.
3. Check DTC.
Is DTC detected?
YES >>
Proceed to DTC Diagnosis Procedure.
NO-1 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2 >>
Confirmation after repair: INSPECTION END
PERFORM DTC CONFIRMATION PROCEDURE-DTC P2103
1. Turn ignition switch ON and wait at least 1 second.
2. Check DTC.
Is DTC detected?
YES >>
Proceed to DTC Diagnosis Procedure.
NO-1 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2 >>
Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY

Turn ignition switch ON.

Check the voltage between ECM harness connectors.

+	−	Voltage (Approx.)
F25	128	E16	162	Battery voltage

−

Voltage

(Approx.)

ECM

Connector

Terminal

Connector

Terminal

F25

128

E16

162

Battery voltage

Is the inspection result normal?

YES >>

GO TO 3.

NO >>

GO TO 2.

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.
Disconnect IPDM E/R harness connector.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

ECM		IPDM E/R		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F25	128	F96	72	Existed

Also check harness for short to ground and to power.

Is the inspection result normal?

YES >>

Perform the trouble diagnosis for power supply circuit.

NO >>

Repair or replace malfunctioning part.

CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL

Turn ignition switch OFF.

Check the voltage between ECM harness connectors.

+		−		Condition		Voltage (Approx.)
ECM
Connector	Terminal	Connector	Terminal
F25	97	E16	162	Ignition switch	OFF	0 V
F25	97	E16	162	Ignition switch	ON	Battery voltage

Is the inspection result normal?

YES >>

INSPECTION END

NO >>

GO TO 4.

CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.
Disconnect IPDM E/R harness connector.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

ECM		IPDM E/R		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F25	97	F96	67	Existed

Also check harness for short to ground and to power.

Is the inspection result normal?

YES >>

INSPECTION END

NO >>

Repair or replace malfunctioning part.

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