Isuzu KB P190. Manual — part 948

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–6

DTC Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Conditions for Running the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 101

Conditions for Setting the DTC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Action Taken When the DTC Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Conditions for Clearing the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 101

Test Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

DTC P0977 Diagnostic Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

4.32

DTC P1810, P1815 and P1816 – Transmission Fluid Pressure Position Switch. . . . . . . . . . ... 103

DTC Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Conditions for Running the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 104

DTC P1810 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

DTC P1815 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

DTC P1816 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Conditions for Setting the DTC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

DTC P1810 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

DTC P1815 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

DTC P1816 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Action Taken When the DTC Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Conditions for Clearing the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 105

Diagnostic Aids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 105

Test Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

DTC P1810, P1815 and P1816 Diagnostic Table. . . . . . . . . . . . . . . . . . . . . . . .. 105

4.33

DTC P2763 – Torque Converter Clutch Pressure Control Solenoid Control Circuit High Voltage . . . . 108

DTC Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Conditions for Running the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 108

Conditions for Setting the DTC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Action Taken When the DTC Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Conditions for Clearing the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 108

Test Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

DTC P2763 Diagnostic Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

4.34

DTC P2764 – Torque Converter Clutch Pressure Control Solenoid Control Circuit Low Voltage . . . .. 111

DTC Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Conditions for Running the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 111

Conditions for Setting the DTC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Action Taken When the DTC Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Conditions for Clearing the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 111

Test Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

DTC P2764 Diagnostic Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

4.35

DTC P2769 – Torque Converter Clutch Enable Solenoid Control Circuit Low Voltage . . . . . . . ... 115

DTC Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Conditions for Running the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 115

Conditions for Setting the DTC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Action Taken When the DTC Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Conditions for Clearing the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 116

Diagnostic Aids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 116

Test Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

DTC P2769 Diagnostic Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

4.36

DTC P2770 – Torque Converter Clutch Enable Solenoid Control Circuit High Voltage. . . . . . . ... 119

DTC Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Conditions for Running the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 119

Conditions for Setting the DTC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Action Taken When the DTC Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Conditions for Clearing the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 120

Test Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–7

DTC P2770 Diagnostic Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

4.37

DTC U0073 and U0100 – CAN-Bus No Communication With ECM (Engine Control Module). . . . . .. 121

DTC Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Circuit Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Conditions for Running the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 121

Conditions for Setting the DTC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

DTC U0073 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

DTC U0100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Action Taken When the DTC Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Conditions for Clearing the DTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 122

Test Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

DTC P0864 and U0101 Diagnostic Table. . . . . . . . . . . . . . . . . . . . . . . . . . .. 122

5

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

5.1

Transmission Fluid Temperature (TFT) Sensor Specifications . . . . . . . . . . . . . . . . . . 124

5.2

Range Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

5.3

Transmission Fluid Pressure Manual Valve Position Switch Logic . . . . . . . . . . . . . . . .. 125

5.4

Transmission Range Switch Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 125

5.5

Component Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

5.6

Shift Solenoid Valve State and Gear Ratio . . . . . . . . . . . . . . . . . . . . . . . . . .. 126

5.7

Line Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

6

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..127

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–8

1 General

Information

1.1 Introduction

This Section covers the electrical diagnostic for the 4L60E automatic transmission when mated to a V6 engine.

1.2 General

Description

The 4L60E automatic transmission incorporates electronic controls that utilise a transmission control module (TCM) to
control shift points through:

•

the 1-2 and 2-3 shift solenoid valves,

•

the 3-2 downshift solenoid valve,

•

a torque converter clutch (TCC) solenoid valve,

•

apply and release through the TCC pulse width modulated (PWM) solenoid valve, and

•

line pressure through the pressure control (PC) solenoid valve.

Electrical signals from various sensors provide information to the TCM about the following:

•

vehicle speed,

•

throttle position,

•

engine coolant temperature,

•

transmission fluid temperature,

•

gear range selector position,

•

engine speed,

•

converter turbine speed, and

•

engine load braking and operating mode.

The TCM uses this information to determine the precise moment to upshift or downshift, apply or release the TCC and
what fluid pressure is needed to apply the clutches. This type of control provides consistent and precise shift points and
shift quality based on the operating conditions of the vehicle.

Figure 7C2 – 1 shows the location of the internal electronic components in the transmission.

Automatic Transmission – 4L60E – Electrical Diagnosis

Page 7C2–9

Figure 7C2 – 1

Legend

1

Vehicle Speed Sensor

5

Torque Converter Clutch Pulse Width Modulation (TCC
PWM) Solenoid Valve

2

1-2 Shift Solenoid (Solenoid A) and 2-3 Shift Solenoid
(Solenoid B)

6

Torque Converter Clutch (TCC) Solenoid Valve

3

Automatic Transmission Fluid Pressure (TFP) Manual Valve
Position

7

Pressure Control (PC) Solenoid Valve

4

3-2 Downshift Solenoid

Transmission Adaptive Functions

The 4L60E automatic transmission uses a line pressure control system, which has the ability to adapt the system line
pressure to compensate for normal wear within the transmission, such as the clutch pack fibre plates, seals, springs, etc.
The adapt feature is similar in function to the long term/short term fuel trim feature of the engine management system.

The 4L60E automatic transmission uses the adapt function for garage shifts, upshifts and torque converter clutch (TCC)
application. The TCM monitors the engine torque to determine if the shift is occurring too fast or too slow and adjusts the
pressure control solenoid to maintain the correct shift feel.