Opel Frontera UBS. Manual - part 1449

7A–38

AUTOMATIC TRANSMISSION (AW30-40LE)

DTC P0727 (FLASHING CODE 13) ENGINE REVOLUTION SIGNAL FAILURE (NE)

D07RY00019

Circuit description:
Engine revolution (rpm) signals are sent from Engine
Control Module (ECM) to the Transmission Control
Module (TCM).
The engine speed sensor is an electromagnetic pulse
pickup type that generates signals when the flywheel
gear revolves (2 pulses at a single revolution of the
flywheel gear).
The TCM converts these sine wave signals into engine
revolution (RPM) signals.

Fail-safe control:
The TCM controls fail-safe by detecting engine revolution
sensor failure.

Failure detection:

• When input revolution is more than 2000 rpm

• When not even 1 pulse is input in the engine

revolution signal during 5 seconds

• Detection inhibit condition: At 4th gear

Contents of control:
At failure detection

• Up hill and down hill control inhibit

• Oil temperature sensor failure detection inhibit

• Blinks "CHECK TRANS" lamp

• Stores the failure information in failure memory.

At failure decision

Same as failure detection

Conditions of turning "CHECK TRANS" lamp off: 
Turns "CHECK TRANS" lamp off when judged 0km/h by
speed meter sensor after the engine revolution signal
pulses are input 250 pulses normally.
(however, uses 0 km/h judgment by back-up vehicle
speed at output revolution failure)

Reversion conditions from fail-safe: 
Recovers at the same time as the conditions of turning
“CHECK TRANS” lamp off are satisfied.

Test description:

The following numbers correspond to circled numbers on
the diagnostic chart.

(1) Engine revolution signals are input from the ECM into

the TCM.

(2) When the engine idling, voltage fluctuates with (AC

intermittent) range of less than 1.4V 

⇔ 

9 

∼

 16V.

Diagnostic aids:
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–39

DTC P0727 (FLASHING CODE 13) ENGINE REVOLUTION SIGNAL FAILURE (NE)

DTCP0727

7A–40

AUTOMATIC TRANSMISSION (AW30-40LE)

DTC P0743 (FLASHING CODE 33) TORQUE CONVERTER CLUTCH CONTROL LOCK-UP (ON/

OFF) SOLENOID FAILURE (SL)

D07RY00047

Circuit description:
The lock-up solenoid SL of the torque converter clutch
(TCC) controls the lock-up clutch by a signal according to
the lock-up range judgement of the TCM when the
vehicle runs.
This function can improve the fuel consumption to almost
the same extent as the manual transmission. The lock-up
solenoid  SL  is  put  into  B+  by  the  TCM,  so  that  the
solenoid is actuated with the result of lock-up.

Fail-safe control:
The TCM controls fail-safe by detecting SL solenoid
failure.

Failure detection:

GND SHORT detection

•When SHORT detection continues for 0.3 sec.

•When SHORT failure detection continues 8 times.

Open detection

•When OPEN detection continues for 0.5 sec.

•When OPEN failure detection continues 8 times.

Contents of control:
At failure detection

• Lock-up control inhibit

• If + B short failure is detected, keeps 1st gear when

the vehicle speed calculated by output revolution
sensor is less than 10km/h to prevent stall.
(Canceled at more than 15km/h)

At failure decision

Executes following items in addition to above control
items at failure detection.

•Stores the failure information in failure-memory.

Conditions of turning “CHECK TRANS” lamp off:
None

Reversion conditions from fail-safe:
When a normal condition is judged by rechecking on the
state of lock-up ON/OFF
Test description:

The following numbers correspond to circled numbers on
the diagnostic chart.

(1) When the key is ON, the voltage between the TCM

connector terminals (C78-12) and (C78-15 or 19) is
1.0 V or less.

(2) When the gear is of the 2nd speed in the D range

and the throttle opening is about 50% at a higher
speed than about 40km/h, the TCM supplies 8 to 16
V, so that the solenoid is actuated with the result of
lock-up.

(3) The resistance range of the solenoid is 11 to 15

Ω

.

Diagnostic aids:
In case of faulty connection, open or shorted circuit. to
the TCM terminal (C78-12), DTC P0743 is displayed. A
intermittent failure may be caused by a poor connection,
rubbed through wire insulation or a wire broke inside the
insulation.

AUTOMATIC TRANSMISSION (AW30-40LE)

7A–41

DTC P0743 (FLASHING CODE 33) TORQUE CONVERTER CLUTCH CONTROL LOCK-UP (ON/OFF) SOLENOID
FAILURE (SL)

DTCP0743