Opel Frontera UE. Manual - part 1603

 

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Opel Frontera UE. Manual - part 1603

 

 

7A1–34 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P0706/Flashing Code 74 Transmission Range Switch (Mode Switch)
Performance 

Step

Action

Yes

No

1

Perform the following checks:

D

The transmission linkage from the select lever to the manual
valve is adjusted properly.

D

Diagnostic circuit check.

Were the checks performed?

Go to 

Step 2

Refer to 

Select

Lever, and Mode

Switch in

Automatic

Transmission

(4L30–E) section

2

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. Select each transmission range:  DL, D2, D3, D4, N, R, and P.

Does each selected transmission range match the scan tool
“Range Switch” display?

Go to 

Diagnostic
Aids

Go to 

Step 3

3

Are all range switch pin displays incorrect?

Go to 

Step 4

Go to 

Step 5

4

Check fuse and wiring to the 8–way connector terminal 5(D) for
opens.
Refer to 

Mode Switch in Automatic Transmission (4L30–E)

section.
If no problem was found, replace the range switch.

Is the replacement complete?

Go to 

Step 8

5

1. Disconnect the 8–way range switch connector.
2. Using ohmmeter, check continuity between terminal 5(D) and

respectively terminals 3(G), 6(C), 7(B) and 8(A) of the 8–way
range switch connector.

3. Move shift selector lever through all positions and compare

results with “Range Switch Logic Table”.

Is one range switch pin display incorrect?

Go to 

Step 6

Go to 

Step 7

6

Check the affected wiring and connector, and repair.

Is the repair complete?

Go to 

Step 8

7

Check the Powertrain Control Module (PCM) connectors for poor
connection.
If no problem was found, replace the PCM.

Is the replacement complete?

Go to 

Step 8

8

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

then “Clear Info” function and road test the vehicle.

2. Review the scan tool “DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to 

Step 1

Repair verified
Exit DTC table

SECTION

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–35

DTC P0712/Flashing Code 75 Transmission Fluid Temperature (TFT) Sensor
Circuit Low Input

D07R100026

Circuit Description

The TFT sensor is a thermister that controls the signal
voltage to the PCM.  The PCM supplies a 5–volt reference
signal to the sensor on circuit RED/BLK.  When the
transmission fluid is cold, the sensor resistance is high.
The PCM detects high signal voltage.  As the
transmission fluid temperature increases to the normal
operating temperature of 100

°

C (212

°

F), the sensor

resistance becomes less and the voltage decreases to
1.5 to 2 volts.  With transmission fluid over temperature
and DTC P0218 (Flashing Code 71) also set, check the
transmission cooling system.
This DTC detects a continuous short to ground in the TFT
signal circuit or the TFT sensor.  This is a type “D” DTC.

Conditions For Setting The DTC

D

Battery voltage is between 10 and 16 volts.

D

Ignition is “on”.

D

TFT sensor indicating a voltage less than 0.4 volts.

D

All conditions met for 20 seconds.

Action Taken When The DTC Sets

D

Transmission default temperature will be:

80

°

C (176

°

F) if engine temperature code is set.

100

°

C (212

°

F) if engine temperature is warm.

80

°

C (176

°

F) if engine run time is greater than 5

minutes.

21

°

C (69.8

°

F) if engine run time is less than 5

minutes.

D

The PCM will not illuminate the CHECK TRANS
Lamp.

Conditions For Clearing The DTC

D

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

D

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

Check harness routing for a potential short to ground
in circuit RED/BLK. Scan tool TFT display should rise
steadily to about 100

°

C (212

°

F), then stabilize.

D

Inspect the wiring for poor electrical connection at the
PCM and at the transmission 7–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.

D

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

D

The temperature to resistance value scale may be
used to test the TFT sensor at the various
temperature levels to evaluate the possibility of a
“skewed” (mis–scaled) sensor.

A “skewed” sensor could result in delayed garage
shifts or TCC complaints.

D

Verify customer driving habits, trailer towing, etc.

SECTION

7A1–36 TRANSMISSION CONTROL SYSTEM (4L30–E)

Test Description

The numbers below refer to the step numbers on the
diagnostic chart:
2. This test checks for a short to ground or a “skewed”

sensor.

3. This test checks for an internal fault within the

transmission by creating an open.

DTC P0712/Flashing Code 75 Transmission Fluid Temperature (TFT) Sensor Circuit Low
Input 

Step

Action

Yes

No

1

Perform the transmission fluid checking procedure.  Refer to
Checking Transmission Fluid Level and Condition in Automatic
Transmission (4L30–E) section.

Was the fluid checking procedure performed?

Go to 

Step 2

Refer to

Checking

Transmission

Fluid Level and

Condition in

Automatic

Transmission

(4L30–E) section

2

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”.

Does the scan tool display a TFT sensor signal voltage less than
0.4 volts?

Go to 

Step 3

Go to 

Diagnostic
Aids

3

1. Turn the ignition “off”.
2. Disconnect the transmission 7–way connector E–54.
3. Turn the ignition “on”.

Does the TFT signal voltage change to match the voltage 4.92
volts?

Go to 

Step 4

Go to 

Step 9

4

Using the J39200 DVOM, measure the resistance between
terminals 3(C) and 5 (D).

Is the resistance within specifications? (See Transmission Fluid
Temperature (TFT) Sensor Specifications.)

Go to 

Diagnostic
Aids

Go to 

Step 5

5

1. Disconnect the transmission 7–way connector E–54.
2. Using the J39200 DVOM, measure the resistance between

terminals E54–4(F) and E54–1(E).

Is the resistance within specifications? (See Transmission Fluid
Temperature (TFT) Sensor Specifications.)

Go to 

Diagnostic
Aids

Go to 

Step 6

6

1. Remove the transmission oil pan.  Refer to 

Transmission Oil

Temperature Sensor (Adapter Case) in Automatic
Transmission (4L30–E) section.

2. Check the internal wiring harness for a short to ground.

Was a problem found?

Go to 

Step 8

Go to 

Step 7

7

1. Disconnect the internal wiring harness at the TFT sensor.
2. Measure the resistance of the TFT sensor.

Is the resistance within specifications? (See Transmission Fluid
Temperature (TFT) Sensor Specifications.)

Go to 

Diagnostic
Aids

Go to 

Step 8

8

Replace the TFT Sensor.

Is the replacement complete?

Go to 

Step 12

SECTION

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–37

DTC P0712/Flashing Code 75 Transmission Fluid Temperature (TFT) Sensor Circuit Low
Input  (Cont’d)

Step

No

Yes

Action

9

Check circuit RED/BLK for a short to ground.

Was a problem found?

Go to 

Step 12

Go to 

Step 10

10

Check the PCM for faulty connections.

Was a problem found?

Go to 

Step 12

Go to 

Step 11

11

Replace the PCM. Refer to 

Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete?

Go to 

Step 12

12

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

then “Clear Info” function and ensure the following conditions
are met:
TFT sensor indicates a voltage greater than 0.33 volts for 2
seconds.

2. Review the scan tool “DTC info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to 

Step 1

Repair verified
Exit DTC table

SECTION

 

 

 

 

 

 

 

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