2004 ISUZU TF SERIES lock

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.

7A2-40 DIAGNOSIS (JR405E)
DTC P0717 (Flash Code 14) Turbine Speed Sensor No Signal

Turbine
Sensor TCM



B3
H23 (9)C95 (3) E31 (2)
(1)
(3)
E10
Key SW
BRN/RED
WHT
BLK BRN/RED


Speed Sensor Turbine Sensor

Setting Condition:

The turbine speed below 300 rpm for 2 seconds while the vehicle is running at the speed over 40 km/h with the
engine speed over 1500 rpm in the 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:

Turbine speed sensor malfunction.

Sensor wheel (reverse & high clutch drum) malfunction.

Large sensing gap between speed sensor and sensor wheel (reverse & high clutch drum).

Sensor wire open circuit, short circuit to battery or short circuit to ground between turbine speed sensor terminal
1 and TCM terminal B3 (C95).

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

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

Poor connection of each connector.

7A2-42 DIAGNOSIS (JR405E)
DTC P0710 (Flash Code 15) ATF Temperature Sensor Failure

ATF
Temp.
Sensor
TCM


B4 (+)



B14 (-)

H23 (8)



(3)
C95 (4)



(14)
BLU
Terminal
Assembly
BLU/BLKE54 (2)



(8)
BLU
BLU/BLK


Setting Condition:

The condition in which the voltage of oil temperature sensor is below 0.1V (146 C) and ATF temperature
warning lamp ON in the P or N range lasts for more than 5 minutes.
Or

The vehicle speed exceeds 20 km/h and the voltage of oil temperature sensor exceeds 2.43V (-40 C) for more
than 10 seconds.

Fail Safe:

The lock-up is inhibited, and TCM is controlled ATF temperature 80 C condition as substitute.

When the engine speed is more than 470 rpm for 10 minuets, the lock-up and gear shift to 4th (over-drive) are
allowed.

Possible Cause:

Oil temperature sensor wire open circuit or short circuit.

Oil temperature sensor malfunction.

Power supply wire open circuit, short circuit to battery or short circuit to ground between oil temperature sensor
and TCM terminal B4 (C95).

Ground wire open circuit or short circuit to battery between oil temperature sensor terminal and TCM terminal
B14 (C95).

Poor connection of each connector.

Reference:
Following output voltage and resistance can be measured by circuit tester.
Measurement terminal: B4 (C95) and B14 (C95)

ATF Temperature Output Voltage Resistance ATF Temperature Output Voltage Resistance
20
C
1.55V 2,500  80
C
0.5V 320 
40
C 1.08V 1,160  100
C
0.3V 190 
60
C
0.7V 590  120
C
0.2V 120 

DIAGNOSIS (JR405E) 7A2-43
DTC P0560 (Flash Code 16) System Voltage Failure
TCM


A1 (+B)



B5

B15

H23 (15)C95 (5)
(15)
BLK/YEL
BLK
BLK
Battery
C94
(1)
BLK


Setting Condition:

The supply voltage is below 10V and the engine speed exceeds 1000 rpm for more than 1 second.

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. (In case of fail-safe
valve failure, gear shift to 4th (over-drive) is inhibited.)

Possible Cause:

Alternator or battery malfunction.

Power supply wire open circuit or short circuit to ground between power supply and TCM terminal A1 (C94).

Ground wire open circuit or short circuit to battery between ground location and TCM terminal B5 (C95) or B15
(C95).

Poor connection of each connector.

DIAGNOSIS (JR405E) 7A2-45

Setting Condition:

No range signal is entered from the inhibitor switch with the engine speed over 500 rpm for 2 seconds.
Or

Multiple signals are entered from the inhibitor switch for 1 second.

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:

Inhibitor switch incorrect adjustment.

Inhibitor switch malfunction.

Open circuit or short circuit to battery between inhibitor switch terminal 2 and TCM terminal A2 (C94), terminal 4
and TCM terminal B19 (C95), terminal 8 and TCM terminal B10 (C95), terminal 5 and TCM terminal B11 (C95),
terminal 1 and TCM terminal A17 (C94), terminal 9 and TCM terminal B2 (B95), or terminal 6 and TCM terminal
B21 (C95), or short between respective harness.

Power supply wire open circuit or short circuit to ground between inhibitor switch terminal 3 and power supply
circuit.

Poor connection of each connector.


Reference:
Following continuity can be measured by circuit tester.

10 7 3 2 4 8 5 1 9 6
P
R
N
D
3
2
L

7A2-46 DIAGNOSIS (JR405E)
DTC P1120 (Flash Code 22) Throttle Signal Failure





TPS TCM



A16
C56 (29)C94 (16)
RED/WHT
C56
(49)

(38)
(57)
(69)

ECM







C56 (ECM-A)

Setting Condition:

No throttle signal is sent from the ECM for 0.4 seconds.

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:

Throttle position sensor malfunction.

Signal wire open circuit or short circuit to battery of the harness between ECM 29 (C56) and TCM terminal A16
(C94).

Poor connection of each connector.

Reference:

At throttle position 0%, OFF duty signal 10% is sent from ECM terminal 29 (C56) to TCM terminal A16 (C94).

At throttle position 100% (WOT), OFF duty signal 90% is sent from ECM terminal 29 (C56) to TCM terminal A16
(C94).

7.14ms 7.14ms


Time Time
0.714ms 6.426ms
Vo l t a ge
Off duty 10% =Throttle Position 0%
Vo l t a ge
Off duty 90% =Throttle Position 100%

DIAGNOSIS (JR405E) 7A2-47
DTC P1875 (Flash Code 25) GND Return Circuit Failure
Control Valve



TCM

B6




B7



B8



B9


B22 (GND)
BLU/BLK
WHT/BLU
L&R Brake Solenoid

Terminal
Assembly
BLK/YEL
RED 2-4 Brake Solenoid


High Clutch Solenoid


Low Clutch Solenoid


E54
(5)

(9)


(10)


(3)

(11) H23 (11)




(5)


(7)



(2)

(1)
GRY/REDC95
(6)




(7)


(8)



(9)

(22)

BLU/BLK
BLK/YEL RED
WHT/BLU
GRY/RED



Setting Condition:

Ground return circuit is failed 7 times continuously after the low & reverse brake duty solenoid output signal turn
on.

Fail Safe:

All solenoid operations are stopped (OFF), the gear is fixed to the 3rd, and the lock-up is inhibited. (In case of
fail-safe valve failure, gear shift to 4th (over-drive) and lock-up are inhibited.)

Possible Cause:

Ground return wire open circuit between terminal assembly terminal 11 and TCM terminal B22 (C95).

Poor connection of each connector.

DIAGNOSIS (JR405E) 7A2-49
Gear Position & Shift Solenoid Operation


Range TCM terminal

Gear B8
(High clutch
solenoid) B9
(Low clutch
solenoid) B7
(2-4 brake
solenoid) B6
(Low & reverse
brake solenoid)
P 

R Reverse


N 

D, 3, 2 1st

2nd


3rd


4th


L 1st


2nd


3rd


4th


: On (Operated)

: Off (Not operated)

Setting Condition:

The low & reverse brake duty solenoid signal is open circuit or short circuit.
(The voltage different from the output ON/OFF signals was detected while the TCM monitors the solenoid output
voltage.)

Fail Safe:

When the vehicle is running, the operation of the low & reverse brake duty solenoid and the lock-up solenoid is
stopped (OFF), 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:

Low & reverse brake duty solenoid malfunction.

Open (Off) circuit or short (On) circuit harness of the low & reverse brake duty solenoid.

Open circuit, short circuit to battery or short circuit to ground between low & reverse brake duty solenoid terminal
5 and TCM terminal B6 (C96).

Insufficient ground condition of the low & reverse brake duty solenoid.

Poor connection of each connector.