ISUZU TF SERIES 2004 Workshop Manual

DIAGNOSIS (JR405E) 7A2-29
PARTS LOCATION (4)

RTW38DXF007601

7A2-30 DIAGNOSIS (JR405E)
PARTS LOCATION (5)

DIAGNOSIS (JR405E) 7A2-31
CONNECTOR LIST
TCM
No. Connector face No. Connector face
B-23
Green
Meter-A B-73

SilverWeld splice 3 (Earth)
B-24
Green
Meter-B C-2
SilverEngine room-RH ground
B-50
White
Power/3rd start switch C-44
WhiteStop lamp switch
B-54
White
J/B I2 C-56
(4JH1-TC)
ECM-A
B-56
White
J/B I4 C-57
(4JH1-TC)
ECM-B
B-58
Black
Check connector C-94
(6VE1)
(4JH1-TC)
Gray TCM
B-62
White
Ignition switch (IGSUB : G1) C-95
(6VE1)
(4JH1-TC)
WhiteTCM
B-63
White
Ignition switch (IGSUB : G2) C-107
WhiteJ/B E2
B-64
Silver
Weld splice 1 (Illumination) C-109
SilverBody-LH ; ground
B-68
(4JH1TC,
6VE1)
White Immobilizer C/U E-10

SilverEngine; ground

7A2-32 DIAGNOSIS (JR405E)

No. Connector face No. Connector face
E-30
(4JH1-TC)
Gray A/T speed sensor H-23
(6VE1)
(4JH1-TC)
WhiteEngine ~ Engine room B
E-31
(4JH1-TC)
Gray Turbine sensor P-1
SilverBattery (+)
E-44
Gray
Vehicle speed sensor P-2
SilverRelay & Fuse box
E-51
(4JH1-TC)
Black Inhibiter switch P-5
SilverBattery (-)
E-54
(4JH1-TC)
Black A/T term ASM P-6
SilverBody earth (Ground)
H-4
(6VE1)
(4JH1-TC)
White Engine ~ Engine room P-10
SilverEngine ground
H-6
White
Engine room ~ INST R-15
Black2-4 WD control unit
H-7
White
Engine room ~ INST


H-18
(RHD)
White Engine room ~ INST


H-22
(6VE1)
(4JH1-TC)
White Engine ~ Engine room C

DIAGNOSIS (JR405E) 7A2-33
DIAGNOSIS TROUBLE CODE TABLE

Flash Code
(P-Code)

CHECK TRANS Flash Pattern

Description
CHECK
TRANS
Warning

11 (P0722) Vehicle Speed Sensor No Signal ON


12 (-) Normal -


13 (P0727) ON

Engine Revolution Sensor No
Signal

14 (P0717) Turbine Speed Sensor No Signal ON


15 (P0710) ATF Temperature Sensor FailureOFF


16 (P0560) System Voltage Failure ON


17 (P0705) Inhibitor Switch Failure ON


22 (P1120) Throttle Signal Failure ON


25 (P1875) GND Return Circuit Failure ON


26 (P1853) ON

Low & Reverse Brake Pressure
Switch Failure

27 (P1858) 2-4 Brake Pressure Switch FailureON


28 (P1863) ON

High Clutch Pressure Switch
Failure

31 (P0753) ON

Low & Reverse Brake Duty
Solenoid Failure

32 (P0758) 2-4BrakeDutySolenoidFailure ON


33 (P0763) ON
High Clutch Duty Solenoid Failure

7A2-34 DIAGNOSIS (JR405E)


Flash Code
(P-Code)

CHECK TRANS Flash Pattern

Description
CHECK
TRANS
Warning

34 (P0768) Low Clutch Duty Solenoid FailureON


35 (P0748) Line Pressure Solenoid Failure ON


36 (P1860) Lock-up Duty Solenoid Failure ON


41 (P0731) 1stGearRatioError ON


42 (P0732) 2ndGearRatioError ON


43 (P0733) 3rdGearRatioError ON


44 (P0734) 4thGearRatioError ON


51 (P1750) ON

Low & Reverse Brake Fail-safe
Valve Failure

52 (P1755) 2-4BrakeFail-safeValveFailure ON


- (P0602) No Flash Code ECU Programming Error ON

DIAGNOSIS (JR405E) 7A2-35
FAIL-SAFEFUNCTION
Fail-Safe Condition
Flash Code
(P-Code)

Description
CHECK
TRANS
Warning

Gear Shift
Solenoid
Line
Pressure
Solenoid

Lock-up

Remark
11
(P0722)
Vehicle peed Sensor No
Signal ON 3rdFix All Stop - Inhibited
13
(P0727)
Engine Revolution Sensor
No Signal ON - - - Inhibited
14
(P0717)
Turbine Speed Sensor No
Signal ON 3rdFix All Stop - Inhibited
15
(P0710)
ATF Temperature Sensor
Failure OFF 3,2,L - - Inhibited*1
16
(P0560)
System Voltage Failure ON 3rdFix All Stop - Inhibited*2
17
(P0705)
Inhibitor Switch Failure ON 3rdFix All Stop - Inhibited
22
(P1120)
Throttle Signal Failure ON 3rdFix All Stop - Inhibited
25
(P1875)
GND Return Circuit
Failure ON 3rdFix All Stop - Inhibited*2
26
(P1853)
Low & Reverse Brake
Pressure Switch Failure ON No Fail-safe Function
27
(P1858)
2-4 Brake Pressure
Switch Failure ON No Fail-safe Function
28
(P1863)
High Clutch Pressure
Switch Failure ON No Fail-safe Function
31
(P0753)
Low & Reverse Brake
Duty Solenoid Failure ON 3rdFix All Stop - Inhibited
32
(P0758)
2-4 Brake Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
33
(P0763)
High Clutch Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
34
(P0768)
Low Clutch Duty Solenoid
Failure ON 3rdFix All Stop - Inhibited
35
(P0748)
Line Pressure Solenoid
Failure ON - - Stop -
36
(P1860)
Lock-up Duty Solenoid
Failure ON - - - Inhibited
41
(P0731)
1stGearRatioError ON No Fail-safe Function
42
(P0732)
2ndGearRatioError ON No Fail-safe Function
43
(P0733)
3rdGearRatioError ON No Fail-safe Function
44
(P0734)
4thGearRatioError ON No Fail-safe Function
51
(P1750)
Low & Reverse Brake
Fail-safe Valve Failure ON 3rdFix All Stop - Inhibited
52
(P1755)
2-4 Brake Fail-safe Valve
Failure ON 3rdFix All Stop - Inhibited
-
(P0602)
ECU Programming Error ON No Fail-safe Function
*1: When the engine speed is more than 470 rpm for 10 minuets, the lock-up and gear shift to 4th (over-drive) are
allowed.
*2: In case of fail-safe valve failure, gear shift to 4th (over-drive) is inhibited.

7A2-36 DIAGNOSIS (JR405E)
DTC P0722 (Flash Code 11) Vehicle Speed Sensor No Signal


Speed
Sensor
TCM



B13
H23
(4)C95
(13)E30
(2)
(1)
(3)
E10
Key SW
YEL/RED
BLK YEL/RED

Speed Sensor Turbine Sensor

Setting Condition:

When the vehicle speed exceeds 5 km/h with the turbine speed over 1000 rpm for 5 seconds, after 25.5
seconds elapsed in D, 3, 2 or L range.

Fail Safe:

When the vehicle is running, the gear position selected at the trouble detection is held and the lock-up is
inhibited.

After the vehicle stopped, all solenoid operations stop (OFF) and the gear is fixed to the 3rd.

Possible Cause:

Speed sensor malfunction.

Sensor wheel (parking gear) malfunction.

Large sensing gap between speed sensor and sensor wheel (parking gear).

Sensor wire open circuit, short circuit to battery or short circuit to ground between speed sensor terminal 1 and
TCM terminal B13 (C95).

Sensor wire open circuit or short circuit to ground of the harness between speed sensor terminal 2 and power
supply circuit.

Sensor wire open circuit or short circuit to battery between speed sensor terminal 3 and ground circuit.

Poor connection of each connector.

DIAGNOSIS (JR405E) 7A2-37

Reference:
When the vehicle speed 20km/h at L range in 1st gear, following signal is outputted.
Measurement terminal: B13 (C95) and B5 (C95)
-AC range by circuit tester: Approximately 6.8 V
-Oscilloscope: Following wave form can be found.

Vehicle Speed Sensor Reference Wave Form
Measurement Terminal: B13 (+) B5 (-)
Measurement Scale: 5V/div 5ms/div
Measurement Condition: Vehicle speed 20km/h at L range in 1st gear0V

7A2-38 DIAGNOSIS (JR405E)
DTC P0727 (Flash Code 13) Engine Revolution Sensor No Signal



RED
TDC
Sensor TCM



A7
C94 (7)
BLK/RED
WHT
C56
(27)
E9
(1)

(2)
(3)

C57 (98)

(90)
(101)

ECM




C56 (ECM-A)

Setting Condition:

The engine speed becomes 0 rpm for 2 seconds while the vehicle is running at the over 40 km/h.

Fail Safe:

Lock-up is inhibited.

Possible Cause:

Crank position sensor malfunction.

Sensor wheel (flywheel) malfunction.

Large sensing gap between speed sensor and sensor wheel (flywheel).

Faulty input signal from crank position sensor to ECM.

Signal wire open circuit or short circuit to battery between ECM A24 and TCM terminal A7 (C94).

Poor connection of each connector.

Reference:
When the engine speed 2000rpm, following signal is outputted.
Measurement terminal: A7 (C94) and B5 (C95)
-AC range by circuit tester: Approximately 6.2V
-Oscilloscope: Following wave form can be found.