Opel Frontera UE. Manual - part 1607

7A1–50 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P0730/Flashing Code 81 Transmission Incorrect Gear Ratio

D07RT015

Circuit Description

The Powertrain Control Module (PCM) calculates the
slippage of the converter and transmission based
upon the engine speed, the output speed, and the
current gear ratio.

The slippage of the converter at a high enough engine
speed is low. The transmission should not slip more
than a given value when there is no shift.

This DTC detects a slip at each gear. This is a type
“C” DTC.

Conditions For Setting The DTC

No Output Speed Sensor DTC(s) P0722 (Flashing
Code 78), P0723 (Flashing Code 79).

Not in Park, Neutral or Reverse.

Engine speed is greater than 3500 rpm.

3 seconds since upshift.

3 seconds since downshift.

3 seconds since garage shift (N

→

D).

And one of the following conditions occur:

– Slip is greater than 720 rpm in 1st gear.

– Slip is greater than 680 rpm in 2nd gear.

– Slip is greater than 660 rpm on 3rd gear.

– Slip is greater than 650 rpm on 4th gear.

All conditions met for 5.5 seconds.

Action Taken When The DTC Sets

Maximum line pressure.

The PCM will illuminate the CHECK TRANS Lamp.

Turn Force Motor off.

SECTION

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–51

Conditions For Clearing The DTC/CHECK
TRANS Lamp

The PCM will turn “off” the CHECK TRANS Lamp
after three consecutive ignition cycles without a
failure reported.

The DTC can be cleared from PCM memory by using
a scan tool. The DTC can also be cleared from
memory when the vehicle has made 40 warmup
cycles without a failure reported.

The PCM will cancel the DTC Actions Taken items
when the fault conditions no longer exist and the
ignition is cycles “off” long enough to power down the
PCM.

Diagnostic Aids

Check for intermittent output speed sensor circuit
problems.

Check for possible incorrect calibration. (PCM part
No., tire specifications, and rear axle ratio)

Test Description

The numbers below refer to the step numbers on the
diagnostic chart:
2. This step checks for possible low fluid level causing

slipping resulting in an undefined gear ratio.

3. This step checks for correct gear ratios for

commanded gears.

4. This step checks for low line pressure.

SECTION

7A1–52 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P0730/Flashing Code 81 Transmission Incorrect Gear Ratio

Step

Action

Yes

Visually inspect the transmission cooling system for fluid leaks.

Refer to

Chart 16: Possible Causes of Transmission Fluid

Leaks of Mechanical/Hydraulic Diagnosis Symptoms Index in
Automatic Transmission (4L30–E) section.

Was condition found and corrected?

Go to

Step 6

Go to

Step 2

Refer to

Checking Transmission Fluid Level and Condition in

Automatic Transmission (4L30–E) section.

Has transmission fluid checking procedure been performed?

Go to

Step 3

Go to

Checking

Transmission

Fluid Level and

Condition in

Automatic

Transmission

(4L30–E) section

1. Install the scan tool.
2. Turn the ignition switch to the “on” position.
3. Engine not running.

NOTE: Before clearing DTC(s) use the scan tool to record the
“Failure Records” for reference, as data will be lost when the “Clear
Info” function is used.

4. Record the Failure Record data.
5. Use the scan tool snapshot mode to record transmission gear

ratios.

6. Drive vehicle in transmission gear ranges L, 2, 3, and D with

the engine speed is greater than 3,500 rpm for 5.5 seconds.

7. Record each transmission gear.

1st:2.73 – 2.99
2nd:1.54 – 1.71
3rd:0.93 – 1.05
4th:0.66 – 0.78

Does commanded gear ratio match ranges as shown?

Refer to

Diagnostic Aids

Go to

Step 4

Perform line pressure check.

Refer to

Line Pressure Test in Automatic Transmission

(4L30–E) section.

Was condition found and corrected?

Go to

Step 6

Go to

Step 5

Check for possible clutch slippage.

Refer to

Chart 6: Diagnostic Trouble Code (DTC) P0730 of

Mechanical/Hydraulic Diagnosis Symptoms Index in
Automatic Transmission (4L30–E) section.

Was condition found and corrected?

Go to

Step 6

—

1. After the repair is complete, use the scan tool to select “DTC”,

then “Clear info” function.

2. Operate the vehicle under the following conditions:

Drive the vehicle in D4 with the engine speed greater than
3,500 rpm to obtain any one of the following gear ratios for
seven seconds.

1st 1:2.73 – 1:2.99

2nd 1:1.54 – 1:1.71

3rd 1:0.93 – 1:1.05

4th 1:0.66 – 1:0.78

Has the last test failed?

Begin diagnosis

again

Go to

Step 1

Repair verified
Exit DTC table

SECTION

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–53

DTC P0748/Flashing Code 82 Pressure Control Solenoid (PCS) (Force Motor)
Circuit Electrical

D07RY00034

Circuit Description

The PCS is a PCM–controlled device used to regulate
transmission line pressure. The PCM compares TPS
voltage, engine rpm, and other inputs to determine the
line pressure appropriate for a given load. The PCM will
regulate the pressure by applying a varying amperage to
the PCS. The applied amperage can vary from 0.1 to 1
amp, and is monitored by the PCM.
This DTC detects a continuous open or short to ground in
the PCS circuit or the PCS. This is a type “C” DTC.

Conditions For Setting The DTC

Battery voltage is between 10 and 16 volts.

The PCM detects that the different between
commanded and actual current is 200 milliampere
(mA) for over 1 second.

Engine speed is greater than 300 rpm.

Action Taken When the DTC Sets

Maximum line pressure.

The PCM will illuminate the CHECK TRANS Lamp.

Turn Force Motor off.

Conditions For Clearing The DTC/CHECK
TRANS Lamp

The PCM will turn “off” the CHECK TRANS Lamp
after three consecutive ignition cycles without a
failure reported.

The DTC can be cleared from PCM history by using a
scan tool.

The DTC will be cleared from memory when the
vehicle has achieved 40 warmup cycles without a
failure reported.

The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled “off”
long enough to power down the PCM.

Diagnostic Aids

Inspect the wiring for poor electrical connection at the
PCM and at the transmission 4–way connector. Look
for possible bent, backed out, deformed or damaged
terminals. Check for weak terminal tension as well.
Also check for a chafed wire that could short to bare
metal or other wiring. Inspect for a broken wire inside
the insulation.

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.

Test Description

The numbers below refer to the step numbers on the
diagnostic chart:
1. This test checks the ability of the PCM to command

the PCS.

2. This test checks the PCS and internal wiring harness

for incorrect resistance.

SECTION

Content .. 1605 1606 1607 1608 ..