Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1753

DIAGNOSIS 7A2-63

DTC P1860 (Flash Code 36) Lock-up Duty Solenoid Failure

Control Valve

TCM

B17

B23

B

Lock-up Solenoid

Terminal

Assembly

V

Line Pressure Solenoid

E54

(4)

(6)

H23

(14)

(6)

C95

(17)

(23)

B

V

Setting Condition:

•

The lock-up 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:

•

The lock-up is inhibited.

Possible Cause:

•

Lock-up duty solenoid malfunction.

•

Open (Off) circuit or short (On) circuit of the lock-up duty solenoid.

7A2-64 DIAGNOSIS

•

Open circuit, short circuit to battery or short circuit to ground between lock-up duty solenoid terminal 4 and TCM

terminal B17 (C95).

•

Insufficient ground condition of the lock-up duty solenoid.

•

Poor connection of each connector.

Reference:
When the lock-up duty solenoid is operated, following signal is outputted.
Measurement terminal: B17 (C95) and B5 (C95)
-AC range by circuit tester: Approximately 7.2V

Lock-up Duty Solenoid Reference Wave Form

Measurement Terminal: B17 (+)

B5 (-)

Measurement Scale: 10V/div

5ms/div

Measurement Condition: Unlock-up condition

Lock-up Duty Solenoid Reference Wave Form

Measurement Terminal: B17 (+)

B5 (-)

Measurement Scale: 10V/div

5ms/div

Measurement Condition: Lock-up condition

DIAGNOSIS 7A2-65

DTC P1853 (Flash Code 26) Low & Reverse Brake Pressure Switch Failure

Control Valve

TCM

B1

B12

B20

RED/YEL

WHT/BLK

2-4 Brake Pressure SW

Terminal

Assembly

YEL

E54

(7)

(12)

(1)

H23

(12)

(10)

C95

(1)

(12)

(20)

RED/YEL

YEL

WHT/BLK

L&R Brake Pressure SW

High Clutch Pressure SW

H22

(8)

Pre-setting Condition:

•

No gear shifting.

•

No Check Trans indicator lamp.

•

No system voltage failure.

•

No inhibitor switch failure.

•

Low & reverse brake duty solenoid 0 or 100 %.

•

ATF temperature more than 60

°

C.

•

ATF input voltage more than 0.1V.

•

Engine speed more than 500 rpm.

7A2-66 DIAGNOSIS

Setting Condition:

•

During the running, the low & reverse brake pressure switch does not turn on though hydraulic pressure is

supposed to be generated in the low & reverse brake.

(All pre-setting conditions are met for 2.5 seconds, Low & reverse brake duty solenoid 0% and low & reverse

brake pressure switch off in R range)

Or

•

During the running, the low & reverse brake switch does not turn off though no hydraulic pressure is supposed to

be generated in the low & reverse brake.

(All pre-setting conditions are met for 2.5 seconds, 4th gear, all pressure switch on and gear ratio 0.652 - 0.735

in D range.)

Fail Safe:

•

No fail safe function

Possible Cause:

•

Low & reverse brake duty solenoid malfunction.

•

Low & reverse brake pressure switch wire open circuit or short circuit.

•

Open circuit, short circuit to battery or short circuit to ground between low & reverse brake pressure switch

terminal 12 and TCM terminal B12 (C95).

•

Low & reverse brake hydraulic circuit malfunction in the control valve.

•

Poor connection of each connector.

Reference:

When the low & reverse brake pressure switch is operated, following signal is outputted.

Measurement terminal: B12 (C95) and B22 (C95)

-At other than R rage or L range in 1st gear: More than 10V

-At R range or L range in 1 st gear: Less than 1V