W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
3. Has a problem been found?
YES
1) Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
1) Go to "EST Switch Signal Inspection" procedure.

EST Switch Voltage Inspection

1. Ignition IG KEY: ON, Engine: OFF.
2. EST Switch connector : Connect.
3. Measure voltage between terminal 06, 09 of EST Switch harness connector and chassis ground.
4. Shift to N Range.
5. Select Mode Switch to "2H -> 4H -> 4L" Mode.
A. Specification : Refer to "Reference data"

CAUTION:
The above value is only for reference. The actual value may differ from it according to various engine condition.

6. Is EST Switch Signal display near the specified value?
YES
1) Fault is intermittent caused by poor contact in the sensor's and/or TCCU's connector or was repaired and TCCU memory was not cleared.Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure
NO
1) Go to "EST Switch Open to ground inspection" procedure.

EST Switch ground harness open circuit inspection

1. Ignition : OFF.
2. EST Switch connector : Disconnect.
3. Measure resistance between terminal 06, 09 of EST Switch connector and chassis ground.
A. Specification : 1 Ohm below.

CAUTION:
The above value is only for reference. The actual value may differ from it according to various engine condition.

4. Is resistance display near the specified value?
YES
1) Go to "EST Switch output harness (Terminal 9) to ground or short circuit inspection" procedure.
NO
1) Check for ground to short circuit of FRRD output harness.
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

EST Switch output harness short circuit to ground inspection (2H, 4L)

1. Ignition : OFF.
2. EST Switch connector : Disconnect.
3. Measure resistance between terminal 06, 09 of EST Switch connector and chassis ground.
A. Specification : Infinite

CAUTION:
The above value is only for reference. The actual value may differ from it according to various engine condition.

4. Is resistance display near the specified value?
YES
1) Go to "EST Switch output harness open circuit inspection (2H, 4L)" procedure.
NO
1) Repair short circuit of EST Switch output harness (2H, 4L).
2) If problem is solved, go to the "Verification of Vehicle Repair".

EST Switch output harness open circuit inspection (2H, 4L)

1. Ignition : OFF.
2. H-04 EST Switch, TCCU connector : Disconnect.
3. Measure resistance between terminal 06, 09 of EST Switch harness connector and 10, 24 of TCCU harness connector [M41].
A. Specification : 1 Ohm below.

CAUTION:
The above value is only for reference. The actual value may differ from it according to various engine condition.

4. Is resistance display near the specified value?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
2) Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Check for open EST Switch output harness (2H, 4L).
2) Repair as necessary and then go to "Verification of Vehicle Repair" procedure.