Terminal and Connector Inspection
1.

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

Is the problem found?

YES

a.

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

NO

a.

Go to "Power Circuit Inspection".

Power Supply Circuit Inspection
1.

Check voltage & waveform in sensor power circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect Lambda sensor connector.

(3)

IG KEY "ON"

(4)

Measure the voltage of Lambda sensor connector terminal 1.

(5)

Monitor the waveform in Lambda sensor connector terminal 1.

1)

Secification : Measured voltage : 2.0 V

Waveform : Refer to "Signal Waveform & Data" of "General Information". The waveform similar to Fig.1) is displayed.

(6)

Is the measured voltage within the specification?

YES

a.

Go to "Signal Circuit Inspection".

NO

a.

No voltage detected in Lambda sensor power circuit : Go to "2. Check open in sensor power circuit" as follows.

b.

High voltage detected in Lambda sensor power circuit : Repair short to battery in Lambda sensor power circuit and go to "Verification of Vehicle Repair".

2.

Check open in Lambda sensor power circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect Lambda sensor connector and ECM connector.

(3)

Check continuity between Lambda sensor connector terminal 1 and ECM connector(CUD-K) terminal 64.

1)

Secification : Continuity(below 1.0Ω )

(4)

Is the measured resistance within the specification?

YES

a.

Repair short to ground in Lambda sensor power circuit and go to "Verification of Vehicle Repair".

NO

a.

Reapir open in Lambda sensor power circuit and go to "Verification of Vehicle Repair".

Signal Circuit Inspection
1.

Check voltage in sensor signal circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect Lambda sensor connector.

(3)

IG KEY "ON".

(4)

Measure the voltage of Lambda sensor connector terminal 4.

1)

Specification : 0.8V~0.9 V

(5)

Is the measured voltage within the specification?

YES

a.

Go to "3. Check sensor pump circuit".

NO

a.

No voltage detected in Lambda sensor signal circuit : Go to "2. Check open in sensor signal circuit" as follows.

b.

High voltage detected in Lambda sensor power circuit : Repair short to battery in Lambda sensor signal circuit and go to "Verification of Vehicle Repair".

2.

Check open in Lambda sensor signal circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect Lambda sensor connector and ECM connector.

(3)

Check continuity between Lambda sensor connector terminal 4 and ECM connector(CUD-K) terminal 87.

1)

Secification : Continuity (below 1.0Ω )

(4)

Is the measured resistance within the specification?

YES

a.

Repair short to ground in Lambda sensor signal circuit and go to "Verification of Vehicle Repair".

NO

a.

Repair open in Lambda sensor signal circuit and go to "Verification of Vehicle Repair".

3.

Check voltage in sensor pump circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect Lambda sensor connector.

(3)

IG KEY "ON".

(4)

Measure the voltage of Lambda sensor connector terminal 6.

1)

Secification : 0.8V~0.9 V

(5)

Is the measured voltage within the specification?

YES

a.

Go to "Ground Circuit Inspection".

NO

a.

No voltage detected in Lambda sensor pumpl circuit : Go to "4. Check open in sensor pump circuit" as follows.

b.

High voltage detected in Lambda sensor power circuit : Repair short to battery in Lambda sensor pump circuit and go to "Verification of Vehicle Repair".

4.

Check open in sensor pump circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect Lambda sensor connector and ECM connector.

(3)

Check continuity between Lambda sensor connector terminal 6 and ECM connector(CUD-K) terminal 65.

1)

Specification : Continuity (below 1.0Ω )

(4)

Is the measured resistance within the specification?

YES

a.

Repair short to ground in Lambda sensor pump circuit and go to "Verification of Vehicle Repair".

NO

a.

Repair open in Lambda sensor pump circuit and go to "Verification of Vehicle Repair".

Ground Circuit inspection
1.

Check voltage in sensor ground circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect Lambda sensor connector.

(3)

IG KEY "ON"

(4)

Measure the voltage of Lambda sensor connector terminal 3.

1)

Secification : 2.3V~2.7V

(5)

Is the measured voltage within the specification?

YES

a.

Go to "Component Inspection".

NO

a.

No voltage detected in Lambda sensor ground circuit : Go to "2. Check open in sensor ground circuit" as follows.

b.

High voltage detected in Lambda sensor ground circuit : Repair short to battery in Lambda sensor ground circuit and go to "Verification of Vehicle Repair".

2.

Check open in sensor ground circuit

(1)

IG KEY "OFF", ENGINE "OFF".

(2)

Disconnect Lambda sensor connector and ECM connector.

(3)

Check continuity between Lambda sensor connector terminal 3 and ECM connector(CUD-K) terminal 86.

1)

Secification : Continuity(below 1.0Ω )

(4)

Is the measured resistance within the specification?

YES

a.

Repair short to ground in Lambda sensor ground circuit and go to "Verification of Vehicle Repair".

NO

a.

Reapir open in Lambda sensor ground circuit and go to "Verification of Vehicle Repair".

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