2004 DAEWOO LACETTI vehicle speed sensor

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 123
DAEWOO V–121 BL4
S The TCM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Failure Records buffer.
S Adopt Emergency/ Substitute mode and constant
4th gear by hydraulic control.
S After ignition OFF/ON : 3rd gear by hydraulic con-
trol. Possible P, R and N also possible.
S High line pressure
Conditions for Clearing the MIL/DTCS The MIL will turn OFF when the malfunction has
not occurred after three–ignition cycle.
S A history DTC will clear after 40 consecutive warm
up cycles without a fault.
S Using a scan tool can clear history DTCs.
Diagnostic Aids
S Check for intermittent input speed sensor or output
speed sensor circuit problems.
S Check for possible incorrect calibration.
DTC P0734 – Gear 4 Incorrect Ratio
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the check completed?–Go to Step 2Go to ”On–
Board Diagnos-
tic System
Check”
2Visually inspect the transaxle cooling system for
fluid leaks.
Was condition found and corrected?–Go to Step 7Go to Step 3
3Has the transaxle fluid checking procedure been
performed?–Go to Step 4Go to Trans-
axle fluid check
procedures
41. Using the scan tool record each transaxle drive
range.
2. Drive the vehicle in transaxle gear ranges 1,2,3
and D with TP greater than 15% and vehicle
speed greater than 16km/h(10mph) for five
seconds.
Does commanded gear ratio match ranges as
shown?1st = 2.719
2nd = 1.487
3rd = 1.000
4th = 0.717Refer to Diag-
nostic AidsGo to Step 5
5Perform line pressure check.
Was the condition found and corrected?–Go to Step 7Go to Step 6
6Check for possible clutch slippage.
Was the condition found and corrected?–Go to Step 7–
71. After the repair, use a scan tool
clear info"
function and road test the vehicle.
2. Review the
DTC info".
Has the last test failed or is the current DTC dis-
played?Replace trans-
axle assemblyRepair verified
exit DTC chart

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 203
DAEWOO V–121 BL4
CONTROL VALVE BODY ASSEMBLY
Tools Required
DW260–070 Plug Remover/Installer
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the transaxle wiring harness and the
park/neutral position switch electrical connector.
3. Raise and suitably support the vehicle.
4. Remove the engine under cover. Refer to Section
9N, Frame and Underbody.
5. Remove the transaxle fluid drain plug using the
plug remover/installer DW260–070 and drain the
transaxle fluid.
6. Remove the oil pan, oil pan gasket. Refer to ”Oil
Pan, Oil Pan Gasket” in this section.
7. Remove the valve body mounting bolts.
8. Remove the automatic transmission input speed
sensor mounting bolt.
9. Remove the automatic transmission output speed
sensor mounting bolt.

5A1 – 236IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
ELECTRONICAL COMPONENTS
Selector Lever/Program Switch
The driver engages the travel position via the selector le-
ver:
P : Park Position
R : Reverse
N : Neutral
D : Forward Speeds
Park/Neutral Position Switch
The Park/Neutral Position Switch is located on the selec-
tor shaft and informs the TCM of the current selector lever
position P–R–N–D–3–2–1.
The selector lever position is transmitted to the TCM in en-
coded form along 4 lines. The encoding is such that mal-
functions in the connecting lead are identified.
The Park/Neutral Position Switch is located on the selec-
tor shaft, which is connected to the selector lever via a pull
cable. In addition, the Park/Neutral Position Switch con-
trols the starter interlock, the reversing light and the selec-
tor lever position indicator on the instrument panel.
Signal Combination
L1L2L3L4
P00120
R00012
N01200
D1212120
31212012
21201212
10121212
Automatic Transaxle Output Speed Sensor
(A/T OSS)
The vehicle A/T OSS is a magnetic inductive pickup that
relays information relative to vehicle speed to the TCM.
Vehicle speed information is used by the TCM to control
shift timing, line pressure, and TCC (lock–up clutch) apply
and release.
The output speed sensor mounts in the case at the speed
sensor rotor, which is pressed onto the spur gear. An air
gap of 0.1mm~1.3mm(0.004~0.05in) is maintained be-
tween the sensor and the teeth on the spur gear teeth. The
sensor consists of a permanent magnet surrounded by a
coil of wire.
As the differential rotates, an AC signal is generated by the
output speed sensor (OSS).
Automatic Transaxle Input Speed Sensor
(A/T ISS)
The A/T ISS is a magnetic inductive pickup that relays in-
formation relative to transaxle input speed to the TCM.
The TCM uses transaxle input speed information to con-
trol line pressure, TCC apply and release and transaxle
shift patterns. This information is also uses to calculate the
appropriate operating gear ratios and TCC slippage.
The input speed sensor mounts onto piston B that is inside
of valve body.
An air gap of 1.8~2.2mm(0.07~0.086inch) is maintained
between the sensor and the piston B.
The sensor consists of a permanent magnet surrounded
by a coil of wire. As the piston B is driven by the turbine
shaft, an AC signal induced in the input speed sensor.
Higher vehicle speeds induce a higher frequency and volt-
age measurement at the sensor.
Sensor resistance should measure between 825~835
ohms at 20°C (68°F). Sensor can measure from
1,000~8,000HZ.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 241
DAEWOO V–121 BL4
TCM INPUTS THAT AFFECT THE 4HP
16 TRANSAXLE
Throttle Position Sensor
S Provides throttle position data to the TCM for deter-
mining shift patterns and TCC apply/release.
S An incorrect throttle position sensor input could
causes erratic or shift pattern, poor shift quality or
TCC function
Automatic Transaxle Output (Shaft) Speed
Sensor
S Provides vehicle speed data to the TCM for deter-
mining shift patterns and TCC apply/release, and
gear ratio calculations.
S An incorrect throttle position sensor input could
causes erratic or shift pattern, poor shift quality or
TCC function
Automatic Transaxle Input (Shaft) Speed
Sensor
S Provides transaxle input speed data to the TCM for
determining shift patterns and TCC apply/release,
and gear ratio.
Engine Coolant Temperature Sensor
S Provides coolant temperature data to the TCM for
determining initial TCC engagement.
S An incorrect engine coolant temperature sensor
input could causes an incorrect initial TCC apply
Engine Speed
S The ignition module provides engine speed data the
TCM.
S The TCM uses engine speed information for con-
trolling wide open throttle shifts and the TCC PWM
solenoid duty cycle.
Stoplamp Switch
S Provides brake apply information to the TCM for
controlling TCC apply and release.
S An incorrect TCC stoplamp switch input could
causes an incorrect TCC apply or release.
Transaxle Fluid Temperature (TFT) Sensor
S Provides transaxle fluid temperature information to
the TCM for determining alternate shift patterns and
TCC apply during high temperature conditions (hot
mode operation).
S An incorrect transaxle temperature sensor input
could causes altered shift patterns, poor shift quali-
ty and incorrect TCC apply.

SECTION : 5A2
AISIN AUTOMATIC TRANSAXLE
CAUTION : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool
or equipment could easily come in contact with exposed electrical erminals. Disconnecting this cable will help
prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.
TABLE OF CONTENTS
SPECIFICATIONS5A2–3 . . . . . . . . . . . . . . . . . . . . . . . . .
General Specifications 5A2–3. . . . . . . . . . . . . . . . . . . .
Transaxle Gear Ratio 5A2–3. . . . . . . . . . . . . . . . . . . . . .
Fluid Capacity 5A2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Pressure Specification 5A2–3. . . . . . . . . . . . . . . .
Fastener Tightening Specifications 5A2–4. . . . . . . . . .
SPECIAL TOOLS5A2–5 . . . . . . . . . . . . . . . . . . . . . . . . . .
Special Tools Table 5A2–5. . . . . . . . . . . . . . . . . . . . . . .
SCHEMATIC DIAGRAMS5A2–8 . . . . . . . . . . . . . . . . . . .
Transmission Control Module (1 of 4) 5A2–8. . . . . . . .
Transmission Control Module (2 of 4) 5A2–9. . . . . . . .
Transmission Control Module (3 of 4) 5A2–10. . . . . . .
Transmission Control Module (4 of 4) 5A2–11. . . . . . .
Shift Mode Diagram 5A2–12. . . . . . . . . . . . . . . . . . . . . .
COMPONENT LOCATOR5A2–17 . . . . . . . . . . . . . . . . . .
Shift Select Control 5A2–17. . . . . . . . . . . . . . . . . . . . . .
Automatic Transaxle Components 5A2–18. . . . . . . . .
Bearing and Races Installation Position
Direction 5A2–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIAGNOSIS5A2–25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connector View 5A2–25. . . . . . . . . . . . . . . . .
Wiring Harness and Connector Inspection 5A2–27. . .
Road Test 5A2–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Function Check 5A2–28. . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Inspection 5A2–30. . . . . . . . . . . . . . . . . . . . . . . . . .
On–Vehicle Repair (Matrix Chart) 5A2–34. . . . . . . . . .
DIAGNOSIS TROUBLE CODE DIAGNOSIS5A2–36 .
Diagnosis Trouble Code Chart 5A2–36. . . . . . . . . . . . .
DTC P0562 System Voltage Low 5A2–37. . . . . . . . . .
DTC P0563 System Voltage High 5A2–40. . . . . . . . . .
DTC P0601 Internal Control Module Memory
Checksum Error 5A2–43. . . . . . . . . . . . . . . . . . . . . . .
DTC P0604 Internal Transmission Control Module
(TCM) Random Access Memory (RAM)
Error 5A2–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DTC P0705 Transmission Range (TR) Switch
Circuit Malfunction 5A2–47. . . . . . . . . . . . . . . . . . . . .
DTC P0712 Transmission Fluid Temperature
(TFT) Sensor Circuit Low Input 5A2–50. . . . . . . . . .
DTC P0713 Transmission Fluid Temperature
(TFT) Sensor Circuit High Input 5A2–53. . . . . . . . . .
DTC P0717 Input Shaft Speed (ISS) Sensor
Circuit No Signal 5A2–56. . . . . . . . . . . . . . . . . . . . . . .
DTC P0722 Ouput Shaft Speed (OSS) Sensor
Circuit No Signal 5A2–59. . . . . . . . . . . . . . . . . . . . . . .
DTC P0727 Engine Speed Input Circuit No
Signal 5A2–62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0741 Torque Converter Clutch (TCC)
Circuit Stuck Off 5A2–65. . . . . . . . . . . . . . . . . . . . . . .
DTC P0742 Torque Converter Clutch (TCC)
Circuit Stuck On 5A2–67. . . . . . . . . . . . . . . . . . . . . . .
DTC P0743 Torque Converter Clutch (TCC)
Electrical 5A2–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0748 Pressure Control Solenoid (PCS)
Electrical 5A2–72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC P0751 Shift Solenoid 1 (SS1) Stuck Off 5A2–75
DTC P0753 Shift Solenoid 1 (SS1) Electrical 5A2–77
DTC P0756 Shift Solenoid 2 (SS2) Stuck Off 5A2–80
DTC P0758 Shift Solenoid 2 (SS2) Electrical 5A2–82
DTC P0785 Timing Solenoid (ST) Electrical 5A2–85.
DTC P1781 Engine Torque Signal Error 5A2–88. . . . .
DTC P1791 Throttle Position Signal Error 5A2–91. . .
DTC P1792 Engine Coolant Temperature (ECT)
Signal Error 5A2–93. . . . . . . . . . . . . . . . . . . . . . . . . . .
DTC U2105 Can Error 5A2–95. . . . . . . . . . . . . . . . . . . .
MAINTENANCE AND REPAIR5A2–97 . . . . . . . . . . . . .
ON–VEHICLE SERVICE 5A2–97. . . . . . . . . . . . . . . . . . .
Transaxle Fluid Level Checking Procedure 5A2–97. .
Fluid Drain Procedure 5A2–97. . . . . . . . . . . . . . . . . . . .
Locating Fluid Leaks 5A2–98. . . . . . . . . . . . . . . . . . . . .
Case Porosity Repair 5A2–98. . . . . . . . . . . . . . . . . . . . .
Fluid Cooler Flushing 5A2–99. . . . . . . . . . . . . . . . . . . . .
Control Cable Adjustment 5A2–99. . . . . . . . . . . . . . . . .

5A2 – 26IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
X–1 : TCM Vehicle Side Wiring Connector
A1GroundB1R
A2Pressure Control Solenoid GroundB3Clock
A4Pressure Control SolenoidB4Hold
A5Lock–Up SolenoidB6Input Speed Sensor
A6Ignition (+)B7D
A7CAN (Low)B8N
A11Transmission Fluid Temperature SensorB16Input Speed Sensor Ground
A12Transmission Fluid Temperature Sensor
GroundB18L
A14Timing SolenoidB192
A15Shift Solenoid No.2B20P
A16Shift Solenoid No.1B22Stop Lamp Switch
A17CAN (High)B23DLC
A23GroundB25Output Speed Sensor
A24B+––
X–2 : Transmission Range (TR) Switch Connector
1P
2R
3Ground
42
5N
6ST(–)
7D
81
9ST(+)
X–4 : Output Speed Sensor Connector
1Ignition
2Ground
3Output Speed Sensor
X–3 : Transaxle Wiring Connector
1Transmission Fluid Temperature Sensor
2Timing Solenoid
3Pressure Control Solenoid
4Lock–Up Solenoid
5Shift Solenoid No.1
6Transmission Fluid Temperature Sensor
Ground
8Pressure Control Solenoid Ground
10Shift Solenoid No.2
X–5 : Input Speed Sensor
1Input Speed Sensor Ground
2Input Speed Sensor

5A2 – 30IAISIN AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
Manual Shifting Test
Manual shifting test is to determine whether failure symp-
tom is within electrical failure or mechanical failure.
1. Disconnect wire harness of shift solenoid, check
the range and gear positions correspond with below
table when driving by manual shifting.
Range
Gear
D3rd gear
RReverse
Notice : Make sure to disconnect only wire harness of shift
solenoid.
UNIT INSPECTION
Drive Plate Deflection
S Inspect drive plate deflection if within standard
value.
Standard Value
within 0.2mm (0.008 in)
Action :
Standard value is not within the specified value, replace
drive plate.
When ”abnormal wear” or ”stick” on torque converter
sleeve or oil pump is found, replace torque converter and
A/T.
Notice :
S When assembling torque converter and drive plate.
Be sure to use correct bolt with correct length. The
bolt pushes up torque converter front cover, and it
damages lock–up clutch lining. As a result, it cause
major failure ”No move”.
S Do not tighten the bolts by using impact wrench.
Cooler Pipe Bending and Choke
S Inspect it whether there is abnormal pipe bending in
the cooler pipe, pipe deformation and small cross–
section area of pipe line.
Action : Replace failure parts.S Apply compressed air of 2kg/cm
2 from cooler pipe
inlet side, inspect whether there is not cooler pipe
choke by confirming air flow smooth.
Action : Remove foreign particles and clean inside of pipe
line.
Normal
Vehicle Speed Sensor
1. Remove the connector of vehicle speed sensor,
connect 12V power supply and voltmeter to the ter-
minal.(Do not mistake polarity)
2. Check voltage change from approx. 0V to 12V with
vehicle speed sensor driven gear rotated.
Notice : The voltage change should be 4 times for 1 revo-
lution of the vehicle speed sensor driven gear.
Action : If the result of inspection is bad, replace the ve-
hicle speed sensor.

AISIN AUTOMATIC TRANSAXLE 5A2 – 57
DAEWOO V–121 BL4
DTC P0717 Input Shaft Speed (ISS) Sensor Circuit No Signal
StepActionValue(s)YesNo
11. Turn the ignition OFF.
2. Install the Scan tool.
3. With the engine OFF, turn the ignition switch to
the ON position.
4. Select Store Freeze Frame/Failure Records
from the Diagnostic Trouble Codes Information
menu.
5. Store Freeze Frame/Failure Records.
6. Select Clear DTC Information from the Diag-
nostic Trouble Codes Information menu.
7. Clear DTC Information.
8. Perform one vehicle drive cycle.
Is the Malfunction Indicator Lamp (MIL) ON?–Go to Step 2Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector” in
this section.)
21. Select Request DTC by Status from the Diag-
nostic Trouble Codes Information menu.
2. Request DTC by Status.
Is DTC P0717 displayed?–Go to Step 3Repair the tem-
porary connec-
tion failure of
connector (Re-
fer to ”Wiring
Harness and
Connector” in
this section.)
31. Turn the ignition OFF.
2. Inspect the resistance between the vehicle har-
ness and Input Shaft Speed (ISS) sensor. Re-
fer to”Unit Inspection” in this section.
3. Disconnect the TCM connector (X–1) and in-
spect the resistance between the terminal B6
and B16.
Is the measurement within the specified value?20°C (68°F):
560–680 WGo to Step 4Go to Step 5
41. Estimate the failure of between the vehicle wir-
ing harness connector and TCM.
2. Inspect the connector. Refer to ”Wiring Har-
ness and Connector Inspection” in this section.
3. Inspect the connection condition between the
connectors (C–1).
Is the connection condition OK?–Go to Step 6Repair the wir-
ing harness
connectors.
51. Estimate the failure of T/M wire or between the
connectors of ISS sensor.
2. Disconnect the ISS sensor connector (X–5)
and inspect the resistance between terminals 1
and 2.
Is the measurement within the specified value?20°C (68°F):
560–680WGo to Step 7Replace the
ISS sensor