Opel Frontera UE. Manual - part 1605

7A1–42 TRANSMISSION CONTROL SYSTEM (4L30–E)

Diagnostic Aids

D

Inspect the wiring for poor electrical connections at
the PCM and brake switch. 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.

D

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

D

Check customer driving habits and/or unusual driving
conditions (i.e. stop and go, highway).

D

Check brake switch for proper mounting and
adjustment.

Test Description

The numbers below refer to the step numbers on the
diagnostic chart.
2. This step isolates the brake switch as a source for

setting the DTC.

SECTION

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–43

DTC P0719/Flashing Code 77 TCC Brake Switch Circuit High (Stuck On) 

Step

Action

Yes

No

1

1. Install the scan tool.
2. With the engine “off,” turn the ignition switch to the “on”

position.

NOTE:  Before clearing the DTC(s), use the scan tool in order to
record the “Failure Records” for reference. Using the “Clear Info”
function will erase the stored “Failure Records” from the PCM.

3. Record the “Failure Records”, then clear the DTC(s).
4. Select “Brake Switch” on the scan tool.
5. Disconnect the brake switch connector from the brake switch.
6. Connect a test lamp from cavity I18–3 of the brake switch

connector to a known good ground.

Is the test lamp ON?

Go to 

Step 2

Go to 

Step 3

2

Install a J 36169–A Fused Jumper Wire from terminal I18–2 to
terminal I18–3 of the brake switch connector.

Did the TCC Brake Switch status change from Open to Closed?

Go to 

Step 6

Go to 

Step 8

3

1. Remove the fuse “TURN, BACK UP” (15A).
2. Inspect the fuse for an open.

Is the fuse open?

Go to 

Step 4

Go to 

Step 7

4

Inspect circuit WHT/GRN for a short to ground condition. Repair
the circuit if necessary.

Did you find a short to ground condition?

Go to 

Step 10

Go to 

Step 5

5

Inspect circuit GRY/RED–BRN/RED for a short to ground
condition. Repair the circuit if necessary.

Did you find a short to ground condition?

Go to 

Step 10

Go to 

Step 9

6

Replace the brake switch.

Is the replacement complete?

Go to 

Step 10

—

7

Inspect circuit WHT/GRN for an open condition. Repair the circuit
if necessary.

Did you find and correct an open condition?

Go to 

Step 10

—

8

Inspect circuit GRY/RED–BRN/RED for an open.

Did you find an open condition?

Go to 

Step 10

Go to 

Step 9

9

Replace the PCM.

Is the replacement complete?

Go to 

Step 10

—

10

In order to verify your repair, perform the following procedure:
1. Select DTC.
2. Select Clear Info.
3. With the engine “off,” turn the ignition switch to the “on”

position.

4. Do not depress the brake pedal.
5. Verify that the TCC Brake Switch status indicates “Closed” (12

volts) for 2 seconds.

6. Select Specific DTC. Enter DTC P0719.

Has the test run and passed?

System OK

Begin the

diagnosis again.

Go to 

Step 1

SECTION

7A1–44 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P0722/Flashing Code 78 Transmission Output Speed Sensor (OSS) Low
Input

D07RY00032

Circuit Description

Output speed information is provided to the PCM by the
OSS, which is a permanent magnet (PM) generator.  The
PM generator produces a pulsing AC voltage.  The AC
voltage level and number of pulses increases as the
speed of the vehicle increases.  The PCM then converts
the pulsing voltage to output speed, which is used for
calculations.  The vehicle speed can be displayed with a
scan tool.
This DTC detects a low output speed when there is a high
engine speed in a drive gear range.  This is a type “C”
DTC.

Conditions For Setting The DTC

D

No MAP DTCs P0107 or P0108, P0106, P1106,
P1107.

D

No TPS DTCs P0122 or P0123.

D

Not in Park or Neutral.

D

TPS angle is greater than 10%.

D

Engine vacuum is between 0 and 70kPa.

D

Engine speed is between 3000 and 7000 rpm.

D

Transmission output speed is less than 0 rpm.

D

All conditions met for 5 seconds.

Action Taken When The DTC Sets

D

Fixed to 4th gear.

D

Maximum line pressure.

D

Inhibit TCC engagement.

D

The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK
TRANS Lamp

D

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

D

The DTC can be cleared from the PCM history by
using a scan tool.  The DTC will be cleared from
history when the vehicle has achieved 40 warmup
cycles without a failure reported.

D

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

D

An OSS DTC P0722 will set when no output speed is
at detected at start off.

D

Inspect the wiring for poor electrical connection at the
PCM.  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.

D

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

Test Description

The numbers below refer to the step numbers on the
diagnostic chart:
3. This test checks the OSS circuit.
4. This test checks the integrity of the OSS.
6. This test checks the 5–volt and ground circuit of the

PCM.

SECTION

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–45

DTC P0722/Flashing Code 78 Transmission Output Speed Sensor (OSS) Low
Input 

Step

Action

Yes

No

1

1. Install the scan tool.
2. With the engine “off”, turn the ignition switch “on”.

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

3. Record the DTC “Failure Records”.
4. Raise the drive wheels.
5. Start the engine.
6. Place the transmission in any drive range.

With the drive wheels rotating, does the “Trans Output Speed”
increase with the drive wheel speed?

Go to 

Diagnostic
Aids

Go to 

Step 2

2

Check for the most current and/or incorrect calibration.

Is the calibration current?

Go to 

Step 15

Go to 

Step 3

3

1. Turn the ignition “off”.
2. Disconnect the E–22 (J2, RED) PCM connector.
3. Using the J39200 DVOM, measure the resistance between

harness connector terminals E22–22 and E22–55.

Is the reading 3000 ohms?

Go to 

Step 4

Go to 

Step 5

4

1. Select AC volts.
2. Rotate the rear wheels, ensuring the driveshaft is turning.

Is the voltage greater than 0.5 volts?

Go to 

Step 6

Go to 

Step 7

5

Inspect circuits BLU/YEL and BLU/GRN for a poor connection or
an open circuit.

Was a problem found?

Go to 

Step 16

Go to 

Step 7

6

1. Reconnect the E–22 (J2, RED) PCM connector.
2. Disconnect the OSS harness from the OSS.
3. With the engine “off”, turn the ignition “on”.
4. Using the J 39200 DVOM, measure the voltage at the OSS

harness connector terminals E55–1 and E55–2.

Is the reading between 4.0 to 5.1 volts?

Go to 

Step 15

Go to 

Step 9

7

1. Remove the OSS.
2. Check the output shaft speed sensor rotor for damage or

misalignment. Refer to 

Speed Sensor (Extension Housing) in

Automatic Transmission (4L30–E) section.

Was a problem found?

Go to 

Step 16

Go to 

Step 8

8

Replace the OSS.

Is the replacement complete?

Go to 

Step 16

—

9

Was the reading in step 6 less than 4.0 volts?

Go to 

Step 11

Go to 

Step 10

10

Was the reading in Step 6 greater than 5.1 volts?

Go to 

Step 14

—

11

Using the J 39200 DVOM to chassis ground, measure the voltage
on circuit BLU/YEL.

Is the reading between 4.0 to 5.1 volts?

Go to 

Step 12

Go to 

Step 13

12

Repair the open in circuit BLU/GRN.

Is the repair complete?

Go to 

Step 16

—

13

Check circuit BLU/YEL for a short to ground or open.

Was a problem found and corrected?

Go to 

Step 16

Go to 

Step 15

SECTION