Terminal and Connector Inspection
1.

Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damage of component.

2.

Perform checking procedure as follows.

(1)

Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.

(2)

Check connecting condition of ECM and component connector : Check terminal separation, damage of locking device and connecting condition between terminal and wiring.

note

Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition.(After checking, reconnect the pin at correct position.)

3.

Has a problem been found?

▶ Repair the trouble causing part and go to "Verification of Vehicle Repair" procedure.

▶ Go to "Power Circuit Inspection".

Power Circuit Inspection
■ Check voltage and waveform in power circuit
1.

IG key OFF.

2.

Disconnect lambda sensor connector.

3.

IG key ON.

4.

Check voltage between 'Voltage nernst' terminal of 'LAMBDA SENSOR' harness connector and chassis ground.

Specification : approximately 2.9 V

5.

Connect lambda sensor connector.

6.

Measure waveform at 'Voltage nernst' terminal of 'LAMBDA SENSOR' connector with oscilloscope.

■ Reference signal waveform

Fig.1) It is waveform of 'Voltage nernst' signal with IG key ON and engine ON.

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7.

Are measured value and waveform normal?

▶ Go to "Signal Circuit Inspection" procedure.

▶ If no voltage is detected, go to "Check open in power circuit" as follows.

▶ If the voltage is higher than specification value, repair short to battery between 'Voltage nernst' terminal of 'LAMBDA SENSOR' harness connector and 'Voltage nernst' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

■ Check open in power circuit.
8.

IG key OFF.

9.

Disconnect lambda connector and ECM connector.

10.

Check resistance between 'Voltage nernst' terminal of 'LAMBDA SENSOR' harness connector and 'Voltage nernst' terminal of ECM harness connector.

Specification : Continuity (Below 1.0Ω)

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11.

Is the measured value is within specification?

▶ Repair short to ground between 'Voltage nernst' terminal of 'LAMBDA SENSOR' harness connector and 'Voltage nernst' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

▶ Repair open between 'Voltage nernst' terminal of 'LAMBDA SENSOR' harness connector and 'Voltage nernst' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

Signal Circuit Inspection
■ Check voltage in 'Current adjust' circuit
1.

IG key OFF.

2.

Disconnect lambda sensor connector.

3.

IG key ON.

4.

Check voltage between 'Current adjust' terminal of 'LAMBDA SENSOR' harness connector and chassis ground.

Specification : Approx. 2.0 V

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5.

Is the measured value within specification?

▶ Go to "Check voltage in 'current pump' circuit'' as follows.

▶ If no voltage is detected, go to "Check open in 'Current adjust' circuit" as follows.

▶ If the voltage is high than specification value, repair short to battery between 'Current adjust' terminal of 'LAMBDA SENSOR' harness connector and 'Current adjust' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

■ Check open in 'Current adjust' circuit.
6.

IG key OFF.

7.

Disconnect lambda connector and ECM connector.

8.

Check resistance between 'Current adjust' terminal of 'LAMBDA SENSOR' harness connector and 'Current adjust' terminal of ECM harness connector.

Specification : Continuity (Below 1.0Ω)

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9.

Is the measured value within specification?

▶ Repair short to ground between 'Current adjust' terminal of 'LAMBDA SENSOR' harness connector and 'Current adjust' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

▶ Repair open between 'Current adjust' terminal of 'LAMBDA SENSOR' harness connector and 'Current adjust' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

■ Check voltage in 'Current pump' circuit
10.

IG key OFF.

11.

Disconnect lambda sensor connector.

12.

IG key ON.

13.

Check voltage between 'Current pump' terminal of 'LAMBDA SENSOR' harness connector and chassis ground.

Specification : Approx. 2.0 V

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14.

Is the measured value within specification?

▶ Go to "Ground Circuit Inspection" procedure.

▶ If no voltage is detected, go to "Check open in 'Current pump' circuit" as follows.

▶ If the voltage is high than specification value, repair short to battery between 'Current pump' terminal of 'LAMBDA SENSOR' harness connector and 'Current pump' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

■ Check open in 'Current pump' circuit.
15.

IG key OFF.

16.

Disconnect lambda connector and ECM connector.

17.

Check resistance between 'Current pump' terminal of 'LAMBDA SENSOR' harness connector and 'Current pump' terminal of ECM harness connector.

Specification : Continuity (Below 1.0Ω)

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18.

Is the measured value within specification?

▶ Repair short to ground between 'Current pump' terminal of 'LAMBDA SENSOR' harness connector and 'Current pump' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

▶ Repair open between 'Current pump' terminal of 'LAMBDA SENSOR' harness connector and 'Current pump' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

Ground Circuit Inspection
■ Check voltage in ground circuit
1.

IG key OFF.

2.

Disconnect lambda sensor connector.

3.

IG key ON.

4.

Check voltage between 'Ground' terminal of 'LAMBDA SENSOR' harness connector and chassis ground.

Specification : Approx. 2.3V ~ 2.7V

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5.

Is the measured value within specification?

▶ Go to "Component Inspection" procedure.

▶ If no voltage is detected, go to "Check open in 'Ground' circuit" as follows.

▶ If the voltage is high than specification value, repair short to battery between 'Ground' terminal of 'LAMBDA SENSOR' harness connector and 'Ground' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

■ Check open in 'Ground' circuit.
6.

IG key OFF.

7.

Disconnect lambda connector and ECM connector.

8.

Check resistance between 'Ground' terminal of 'LAMBDA SENSOR' harness connector and 'Ground' terminal of ECM harness connector.

Specification : Continuity (Below 1.0Ω)

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9.

Is the measured value within specification?

▶ Repair short to ground between 'Ground' terminal of 'LAMBDA SENSOR' harness connector and 'Ground' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

▶ Repair open between 'Ground' terminal of 'LAMBDA SENSOR' harness connector and 'Ground' terminal of ECM harness connector, and go to "Verification of Vehicle Repair" procedure.

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