Automatic Transmission - 4L60-E/4L65-E (Service & Replacement): Overview Chevrolet Suburban X

Scheme 427

Test Description

The numbers below refer to the step numbers on the diagnostic table.

Scheme 428

1. This step determines if the scan tool is receiving power through the DLC connector.
2. The MIL should illuminate whenever the ignition is ON and the engine is not running.
3. This step determines if the PCM is transmitting class 2 serial data to the DLC and that the class 2 data circuit is not open or shorted.
4. This step determines if a DTC is current or stored in history.

Scheme 429

Scheme 430

Scheme 431

The numbers below refer to the step numbers on the diagnostic table.

Scheme 432

Scheme 433

1. 3. This step inspects for air flow restrictions or damage which may result in the transmission overheating.

Scheme 434

The numbers below refer to the step numbers on the diagnostic table.

Scheme 435

Scheme 436

Scheme 437

1. 3. This step tests the VSS assembly circuit.
2. 4. This step tests the integrity of the VSS assembly.

Scheme 438

The numbers below refer to the step numbers on the diagnostic table.

Scheme 439

Scheme 440

Scheme 441

1. 3. This step tests the VSS assembly circuit.
2. 4. This step tests the integrity of the VSS assembly.

Scheme 442

The numbers below refer to the step numbers on the diagnostic table.

Scheme 443

Scheme 444

Scheme 445

1. 5. By disconnecting the transmission range switch, the ground path of all TR switch circuits would be removed and the PCM would recognize all circuits as open. The scan tool will display HI for all range signals.
2. 6. This step tests TR switch wiring for an open or the lack of the signal voltage from the PCM.
3. 7. This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal A should change to LOW.
4. 8. This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal B should change to LOW.
5. 9. This step tests TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal C should change to LOW.

Scheme 446

The numbers below refer to the step numbers on the diagnostic table.

Scheme 447

Scheme 448

1. 5. This step tests for an intermittent short or open condition in the engine wiring harness. The test lamp is used as a resistor in the circuit.
2. 6. This step determines if the PCM or the TFT sensor is causing a steady, unchanging TFT reading.

Scheme 449

The numbers below refer to the step numbers on the diagnostic table.

Scheme 450

Scheme 451

1. 3. This step tests for a short to ground condition.
2. 4. This step tests for an internal fault within the transmission by creating an open.

Scheme 452

The numbers below refer to the step numbers on the diagnostic table.

Scheme 453

Scheme 454

1. 3. This step verifies a condition in the TFT sensor circuit.
2. 4. This step simulates a TFT sensor DTC P0712. If the PCM recognizes low signal voltage, high temperature, the PCM and wiring are functioning normally.
3. 5. This step tests the TFT sensor and automatic transmission (AT) wiring harness assembly.

Scheme 455

The number below refers to the step number on the diagnostic table.

Scheme 456

Scheme 457

1. 3. This step isolates the brake switch as a source for setting the DTC.

Scheme 458

The number below refers to the step number on the diagnostic table.

Scheme 459

1. 2. This step isolates the brake switch as a source for setting the DTC.

Scheme 460

The numbers below refer to the step numbers on the diagnostic table.

Scheme 461

Scheme 462

Scheme 463

1. 4. This step tests for voltage to the solenoid.
2. 5. This step tests the ability of the PCM and wiring to control the ground circuit.
3. 7. This step tests the resistance of the TCC solenoid valve and the automatic transmission (AT) wiring harness assembly.

Scheme 464

The numbers below refer to the step numbers on the diagnostic table.

Scheme 465

Scheme 466

1. 2. This step inspects for excessive TCC slip when the TCC is commanded ON.
2. 3. This step inspects for possible causes of no TCC apply.

Scheme 467

The number below refers to the step number on the diagnostic table.

Scheme 468

1. 2. This step tests the hydraulic state of the TCC. When the PCM commands the TCC solenoid valve OFF, the slip speed should increase.

Scheme 469

The numbers below refer to the step numbers on the diagnostic table.

Scheme 470

Scheme 471

Scheme 472

1. 2. This step tests the ability of the PCM to command the PC solenoid valve.
2. 3. This step tests the PC solenoid valve and automatic transmission wiring harness assembly for incorrect resistance.

Scheme 473

The number below refers to the step number on the diagnostic table.

Scheme 474

1. 2. This step tests that the PCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.

Scheme 475

The number below refers to the step number on the diagnostic table.

Scheme 476

1. 2. This step tests that the PCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.

Scheme 477

The numbers below refer to the step numbers on the diagnostic table.

Scheme 478

Scheme 479

Scheme 480

1. 4. This step tests the function of the 1-2 SS valve and the automatic transmission (AT) wiring harness assembly.
2. 5. This step tests for power to the 1-2 SS valve from the ignition through the fuse.
3. 6. This step tests the ability of the PCM and of the wiring to control the ground circuit.
4. 8. This step measures the resistance of the AT wiring harness assembly and of the 1-2 SS valve.

Scheme 481

The number below refers to the step number on the diagnostic table.

Scheme 482

1. 2. This step tests that the PCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.

Scheme 483

The number below refers to the step number on the diagnostic table.

Scheme 484

1. 2. This step tests that the PCM commanded all shifts, that all shift solenoid valves responded correctly, but that all the shifts did not occur.

Scheme 485

The numbers below refer to the step numbers on the diagnostic table.

Scheme 486

Scheme 487

Scheme 488

1. 4. This step tests the function of the 2-3 SS valve and the automatic transmission (AT) wiring harness assembly.
2. 5. This step tests for power to the 2-3 SS valve from the ignition through the fuse.
3. 6. This step tests the ability of the PCM and of the wiring to control the ground circuit.
4. 8. This step measures the resistance of the AT wiring harness assembly and of the 2-3 SS valve.

Scheme 489

The item numbers below refer to the step numbers on the diagnostic table.

Scheme 490

Scheme 491

Scheme 492

1. 4. This step tests the ability of the PCM to control the solenoid.
2. 5. This step tests for voltage to the solenoid.
3. 6. This step tests the ability of the PCM and the wiring to control the ground circuit.
4. 8. This step measures the resistance of the automatic transmission wiring harness assembly and the 3-2 SS valve assembly.

Scheme 493

The numbers below refer to the step numbers on the diagnostic table.

Scheme 494

Scheme 495

Scheme 496

Scheme 497

1. 3. This step tests the torque converter for slippage while in a commanded lock-up state.

Scheme 498

The numbers below refer to the step numbers on the diagnostic table.

Scheme 499

Scheme 500

Scheme 501

1. 3. This step compares the indicated range signal to the selected manual valve position.
2. 5. This step tests for correct voltage from the PCM to the AT in-line 20-way connector.

Scheme 502

The numbers below refer to the step numbers on the diagnostic table.

Scheme 503

Scheme 504

Scheme 505

1. 4. This step tests for voltage to the solenoid.
2. 5. This step tests the ability of the PCM and wiring to control the ground circuit.
3. 7. This step tests the resistance of the TCC PWM solenoid valve and the automatic transmission wiring harness assembly.

Scheme 506

The numbers below refer to the step numbers on the diagnostic table.

Scheme 507

Scheme 508

1. 3. This step tests for a short to ground in the 4WD low signal circuit (CKT 1694).
2. 4. This step tests for an open in the 4WD low signal circuit (CKT 1694) or a faulty transfer case control module.

Scheme 509

Scheme 510

Scheme 511

The numbers below refer to the step numbers on the diagnostic table.

Scheme 512

Scheme 513

1. 4. By disconnecting the TR switch, the ground path of all TR switch circuits is removed and the PCM should recognize all circuits as open. The scan tool should display HI for all range signal states.
2. 5. This step tests the TR switch wiring for an open or the lack of the signal voltage from the PCM.
3. 6. This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
4. 7. This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
5. 8. This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
6. 9. This step tests the TR switch wiring and the PCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.

Scheme 514

The numbers below refer to the step numbers on the diagnostic table.

Scheme 515

1. 2. This step tests for a faulty tow/haul switch.
2. 3. This step tests for voltage input from the BCM to the tow/haul switch.
3. 6. This step tests for ground integrity.

Scheme 516

Scheme 517

1. Start the engine and operate the vehicle for 15 minutes or until the transmission fluid reaches an operating temperature of 82-93°C (180-200°F).
2. Park the vehicle on a level surface.
3. With your foot on the brake, move the shift lever through each gear range. Pause for about 3 seconds in each range, ending in PARK.
4. Apply the parking brake and let the engine idle for 3 minutes.
5. Remove the transmission fluid level indicator. Wipe the indicator clean. Insert the indicator. Give the indicator a full twist in order to close.
6. Wait 3 seconds and remove the indicator.
7. Read both sides of the indicator. The fluid must be within the hot cross-hatched area using the lowest level reading.

Transmission Abbreviations

A/C: Air Conditioning

AC: Alternating Current

AT: Automatic Transmission

CCDIC: Climate Control Driver Information Center

DC: Direct Current

DIC: Driver Information Center

DLC: Diagnostic Link Connector

DMM: Digital Multimeter

DTC: Diagnostic Trouble Code

ECT: Engine Coolant Temperature

EMI: Electromagnetic Interference

IAT: Intake Air Temperature

IGN: Ignition

MAP: Manifold Absolute Pressure

MIL: Malfunction Indicator Lamp

NC: Normally Closed

NO: Normally Open

OBD: On Board Diagnostic

OSS: Output (Shaft) Speed Sensor

PC: Pressure Control

PCM: Powertrain Control Module

PWM: Pulse Width Modulation

RPM: Revolutions Per Minute

SS: Shift Solenoid

TAP: Transmission Adaptive Pressure

TCC: Torque Converter Clutch

TFP: Transmission Fluid Pressure

TFT: Transmission Fluid Temperature

TP: Throttle Position

TV: Throttle Valve

VSS: Vehicle Speed Sensor

WOT: Wide Open Throttle

4WD: Four-Wheel Drive

Scheme 518

Scheme 519

Scheme 520

Scheme 521

Transmission Component and System Description

The mechanical components of the 4L60-E are as follows

1. Torque converter assembly
2. Servo assembly and 2-4 band assembly
3. Reverse input clutch and housing
4. Overrun clutch
5. Forward clutch
6. 3-4 clutch
7. Forward sprag clutch assembly
8. Lo and reverse roller clutch assembly
9. Lo and reverse clutch assembly
10. Two planetary gear sets: Input and Reaction
11. Oil pump assembly
12. Control valve body assembly

The electrical components of the 4L60-E are as follows

1. 1-2 and 2-3 shift solenoid valves
2. 3-2 shift solenoid valve assembly
3. Transmission pressure control (PC) solenoid
4. Torque converter clutch (TCC) solenoid valve
5. TCC pulse width modulation (PWM) solenoid valve
6. Automatic transmission fluid pressure (TFP) manual valve position switch
7. Automatic transmission fluid temperature (TFT) sensor
8. Vehicle speed sensor assembly

For more information, refer to ELECTRONIC COMPONENT DESCRIPTION .