MAP Sensor Output Line Open Circuit Inspection

Check for continuity between the ECM 33P (Black) connector [1] and sensor unit 5P connector [2] of the wire side.

Connection:

Light green/black – Light green/black

 

TOOL:
Test probe	07ZAJ-RDJA110
Is there continuity?
YES	–Replace the ECM with a known good one
	and recheck.
NO	–Open circuit in Light green/black wire

 

MIL 7 BLINKS (ECT SENSOR)

 

 

[1]

 

Lg/Bl

 

 

Lg/Bl

 

Lg/Bl

 

[2]

[1]

 

Before starting the inspection, check for loose or poor contact on the ECT sensor 3P connector and recheck the MIL blinking.

 

ECM

 

5 V

 

ECT SENSOR

 

Y/Bu

 

 

G/W

 

 

Probable cause

• Open or short circuit in Yellow/blue wire between the ECT sensor and ECM

• Open circuit in Green/white wire between the ECT sensor and ECM

 

• Faulty ECT sensor

• Faulty ECM

 

 

4-30

PGM-FI SYSTEM

 

ECT Sensor Input Voltage Inspection

Turn the ignition switch OFF.

Disconnect the ECT sensor 3P connector [1] (page 4-46).

Turn the ignition switch ON and engine stop switch " ".

Measure the voltage at the ECT sensor 3P connector of the wire side and ground.

Connection: Yellow/blue (+) – Ground (–) Standard: 4.75 – 5.25 V

 

Is the voltage within 4.75 – 5.25 V?

 

YES – GO TO STEP 3.

 

NO – GO TO STEP 2.

 

ECT Sensor Short Circuit Inspection

Turn the ignition switch OFF.

Disconnect the ECM 33P (Black) connector (page 4-50).

Check for continuity between the ECT sensor 3P connector [1] of the wire side and ground.

Connection: Yellow/blue – Ground

 

Is there continuity?

 

YES – Short circuit in Yellow/blue wire

 

NO – GO TO STEP 4.

 

ECT Sensor Resistance Inspection

Measure the resistance at the ECT sensor [1] terminals.

Standard: 2.3 – 2.6 kΩ (20°C/68°F)

 

Is the resistance within 2.3 – 2.6 kΩ (20°C/68°F)?

 

YES – GO TO STEP 4.

 

NO – Faulty ECT sensor

 

ECT Sensor Open Circuit Inspection

Check for continuity between the ECM 33P (Black) connector [1] and ECT sensor 3P connector [2] of the wire side.

Connection: Yellow/blue – Yellow/blue Green/white – Green/white

 

TOOL:
Test probe	07ZAJ-RDJA110
Is there continuity?
YES	–Replace the ECM with a known good one,
	and recheck.
NO	–•	Open circuit in Yellow/blue wire
	• Open circuit in Green/white wire

 

[1]

 

 

Y/Bu

 

 

[1]

 

Y/Bu

 

[1]

 

[2]

 

 

G/W

 

G/W

 

Y/Bu _Y/Bu

 

[1]

 

4-31

PGM-FI SYSTEM

MIL 8 BLINKS (TP SENSOR)

 

ECM

 

SENSOR UNIT
					5 V
(TP SENSOR)
		Y/R
			Y
		G/W

 

Probable cause
•	Open circuit in Yellow/red wire between the sensor
	unit and ECM
•	Open or short circuit in Yellow wire between the
	sensor unit and ECM
• Open circuit in Green/white wire between the sensor
	unit and ECM
•	Faulty sensor unit
•	Faulty ECM
1. Sensor Unit Power Line Inspection
	Check the sensor unit power line inspection (page
	4-8).
	Is the sensor unit power line normal?
	YES	–GO TO STEP 2.
	NO	–Replace or repair the abnormal circuit.

 

TP Sensor Output Line Short Circuit Inspection

 

Turn the ignition switch OFF.
	[1]
Disconnect the ECM 33P (Black) connector and
sensor unit 5P connector [1] (page 4-44).
Check for continuity between the sensor unit 5P
connector of the wire side and ground.			Y
Connection: Yellow – Ground
Is there continuity?
YES	–Short circuit in Yellow wire
NO	–GO TO STEP 3.

 

4-32

PGM-FI SYSTEM

 

TP Sensor Output Line Open Circuit Inspection

Check for continuity between the ECM 33P (Black) connector [1] and sensor unit 5P connector [2] of the wire side.

Connection: Yellow – Yellow

 

TOOL:
Test probe	07ZAJ-RDJA110
Is there continuity?
YES	–GO TO STEP 4.
NO	–Open circuit in Yellow wire

 

TP Sensor Resistance Inspection

Connect the sensor unit 5P connector.

Check that the resistance varies in accordance with the throttle operation at the ECM 33P (Black) connector of the wire side.

Connection: Yellow – Green/white

Fully closed-Fully open position: Resistance increases

Fully open-Fully closed position: Resistance decreases

 

Is the resistance normal?

 

YES – Replace the ECM with a known good one,

and recheck.

 

NO – Faulty sensor unit (TP sensor)

 

 

Y

Y

 

[2]

[1]

 

Y G/W

 

 

[1]

 

MIL 9 BLINKS (IAT SENSOR)

 

ECM

 

5 V

 

SENSOR UNIT

 

(IAT SENSOR)

 

Gr/Bu

 

 

G/W

 

 

Probable cause

• Open or short circuit in Gray/blue wire between the sensor unit and ECM

 

• Open circuit in Green/white wire between the sensor unit and ECM

 

• Faulty sensor unit

• Faulty ECM

 

4-33

PGM-FI SYSTEM

 

Sensor Unit Power Line Inspection

 

Check the sensor unit power line inspection (page 4-8).

 

Is the sensor unit power line normal?

 

YES – GO TO STEP 2.

 

NO – Replace or repair the abnormal circuit.