DTC 8-1 (TP sensor low voltage)

 

TP Sensor System Inspection

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

 

Check the TP sensor with the HDS pocket tester when the throttle fully closed.

 

Is about 0 V indicated?

 

YES – • Intermittent failure

• Loose or poor contact on the sensor unit 5P connector

 

NO – GO TO STEP 2.

 

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 3.

 

NO – Replace or repair the abnormal circuit.

 

TP Sensor Output Line Short Circuit Inspection

 

Turn the ignition switch OFF.	[1]

Disconnect the sensor unit 5P connector [1].

 

Check for continuity between the sensor unit 5P connector of the wire side and ground.

Connection: Yellow – Ground

 

Is there continuity?

 

YES – Short circuit in Yellow wire

 

NO – GO TO STEP 4.

 

 

ECM

 

Y

 

 

4-15

PGM-FI SYSTEM

TP Sensor Output Line Open Circuit Inspection

Disconnect the ECM 33P (Black) connector [1].

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

Connection: Yellow – Yellow			Y
TOOL:				Y
Test probe	07ZAJ-RDJA110
Is there continuity?
YES	–GO TO STEP 5.
NO	–Open circuit in Yellow wire
[2]		[1]

 

TP Sensor Inspection

Replace the sensor unit with a known good one (page 4-44).

Connect the sensor unit 5P and ECM 33P (Black) connectors.

Erase the DTC’s (page 4-5).

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

Check the TP sensor with the HDS pocket tester.

Is DTC 8-1 indicated?

 

YES – Replace the ECM with a known good one

 

and recheck.

 

NO – Faulty original sensor unit (TP sensor)

 

DTC 8-2 (TP SENSOR HIGH VOLTAGE)

 

TP Sensor System Inspection

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

 

Check the TP sensor with the HDS pocket tester.

 

Is about 5 V indicated?

 

YES	–GO TO STEP 3.
NO	–GO TO STEP 2.

 

TP Sensor Inspection

Check that the TP sensor voltage increases continuously when moving the throttle from fully closed to fully opened using the data list menu of the HDS pocket tester.

Is the voltage increase continuously?

 

YES – Intermittent failure

 

NO – Replace the TP sensor (sensor unit) with a

 

known good one and recheck.

 

4-16

PGM-FI SYSTEM

 

TP Sensor Resistance Inspection

Turn the ignition switch OFF.

Disconnect the ECM 33P (Black) connector [1].

Measure the resistance at the ECM 33P (Black) connector of the wire side.

Connection: Yellow – Green/white Standard: 0.29 – 0.71 Ω (20°C/68°F)

 

Is the resistance within 0.29 – 0.71 Ω?

 

YES – GO TO STEP 4.

 

NO – Faulty sensor unit (TP sensor)

 

TP Sensor Power Input Voltage Inspection

Connect the ECM 33P (Black) connector. Disconnect the sensor unit 5P connector [1].

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

Measure the voltage at the sensor unit 5P connector of the wire side.

Connection: Yellow/red (+) – Green/white (–) Standard: 4.75 – 5.25 V

 

Is the voltage within 4.75 – 5.25 V?

 

YES	–Replace the ECM with a known good one,
	and recheck.
NO	–•	Open circuit in Green/white wire
	•	Open circuit in Yellow/red wire

 

Y G/W

 

[1]

 

[1]

 

Y/R G/W

 

DTC 9 (IAT SENSOR)

 

 

5 V

 

SENSOR UNIT

 

(IAT SENSOR)

 

	ECM
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

 

4-17

PGM-FI SYSTEM

DTC 9-1 (IAT SENSOR LOW VOLTAGE)

 

IAT Sensor System Inspection

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

Check the IAT sensor with the HDS pocket tester.

 

Is about 0 V indicated?

 

YES – GO TO STEP 2.

 

NO – Intermittent failure

 

IAT Sensor Inspection

Turn the ignition switch OFF. Disconnect the sensor unit 5P connector.

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

Check the IAT sensor with the HDS pocket tester.

 

Is about 0 V indicated?

 

YES – GO TO STEP 3.

 

NO – Faulty sensor unit (IAT sensor)

 

IAT Sensor Voltage Input Line Short Circuit Inspection

 

Check for continuity between the sensor unit 5P
	[1]
connector [1] of the wire side and ground.
Connection: Gray/blue – Ground
Is there continuity?
YES	–Short circuit in Gray/blue wire			Gr/Bu
NO	–Replace the ECM with a known good one,
	and recheck.

DTC 9-2 (IAT SENSOR HIGH VOLTAGE)

 

IAT Sensor System Inspection

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

 

Check the IAT sensor with the HDS pocket tester.

 

Is about 5 V indicated?

 

YES – GO TO STEP 2.

 

NO – • Intermittent failure

• Loose or poor contact on the sensor unit 5P connector