Lexus ES manuals

Lexus ES: Transmission (Input) Mechanical Linkage Failure (P1C8679)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System (for Lithium-ion Battery) / Transmission (Input) Mechanical Linkage Failure (P1C8679)

DTC SUMMARY

Refer to the DTC summary for DTC P1C7779.

Click here

DESCRIPTION

Refer to the description for DTC P1C7779.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P1C8679

Transmission (Input) Mechanical Linkage Failure

Hybrid vehicle transaxle malfunction (input system lock):

When the vehicle is stopped, an engine cranking signal is sent but the generator (MG1) does not rotate.

The generator (MG1) or the engine does not rotate, or the planetary gear unit is malfunctioning.

(1 trip detection logic)
  • Hybrid vehicle transaxle assembly
  • Transmission input damper assembly
  • Engine

Does not come on

Master Warning Light:

Comes on
Related Data List

DTC No.

Data List

P1C8679
  • Generator Revolution
  • Motor Revolution
  • Engine Speed

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. With the vehicle stopped and the shift lever in P, turn the power switch on (READY) and gradually depress the accelerator pedal so that the engine starts.
  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

CAUTION / NOTICE / HINT

HINT:

If this DTC is output, the engine or gears in the transaxle may have seized. Before performing this inspection, check the engine oil, hybrid transaxle fluid, coolant (for Engine) and coolant (for Inverter) levels.

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Powertrain > Hybrid Control > Trouble Codes

(d) Check for DTCs.

Result

Proceed to

P1C8679 only is output, or DTCs except the ones in the table below are also output

A

Any of the following DTCs including pending DTCs are also output

B

Malfunction Content

Relevant DTC

Sensor and actuator circuit malfunction

P1C8779

Generator Mechanical Linkage Failure

P1C8879

Planetary Gear Mechanical Linkage Failure

HINT:

P1C8679 may be output as a result of the malfunction indicated by the DTCs above.

(e) Turn the power switch off.

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

A

2.

CHECK CRANKSHAFT PULLEY REVOLUTION (P POSITION)

Click here

NG

GO TO STEP 7

OK

3.

CLEAR DTC

Click here

NEXT

4.

CHECK ENGINE RACING

Click here

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

5.

CHECK CREEP MOVEMENT

Click here

NG

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

OK

6.

INSPECT ENGINE SPEED

Click here

Result

Proceed to

The absolute value of the difference is less than 500 rpm.

A

The absolute value of the difference is 500 rpm or more continuously for 1 second.

B
A

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

B

REPLACE TRANSMISSION INPUT DAMPER ASSEMBLY

7.

CHECK CRANKSHAFT PULLEY REVOLUTION (N POSITION)

Click here

OK

REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY

NG

REPAIR OR REPLACE ENGINE

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