Opel Frontera UBS. Manual - part 2605

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–71

DTC P1850 Brake Band Apply Solenoid Malfunction  (Cont’d)

Step

No

Yes

Action

10

1. Disconnect the transmission main case connector M–7.
2. Using the J39200 DVOM, measure the resistance between

terminals M7–2(B) and M7–4(C).

Is the resistance within 10–12 ohms?

Go to Step 19

Go to Step 20

11

Using the J39200 DVOM, check continuity between PCM
terminal J1–A16 and ground.

Is there a continuity?

Go to Step 13

Go to Step 25

12

1. Disconnect the transmission 16–way connector H–53.
2. Using the J39200 DVOM, measure the resistance between

terminal H53–13 and H53–15.

Is the resistance within 10–12 ohms?

Go to Step 23

Go to Step 14

13

1. Disconnect the transmission 16–way connector H–53.
2. Using the J39200 DVOM, check continuity between terminal

H53–13 and ground.

Is there a continuity?

Go to Step 15

Go to Step 21

14

1. Disconnect the transmission main case connector M–7.
2. Using the J39200 DVOM, measure the resistance between

terminals M7–2(B) and M7–4(C).

Is the resistance within 10–12 ohms?

Go to Step 24

Go to Step 20

15

1. Disconnect the transmission main case connector M–7.
2. Using the J39200 DVOM, check continuity between the

terminal M7–2(B) and ground.

Is there a continuity?

Go to Step 17

Go to Step 22

16

The wiring harness between PCM terminal J3–E14 and
transmission 16–way connector terminal H53–15 is open.

Was a problem found and corrected?

Go to Step 26

—

17

The brake band apply solenoid is faulty, or the internal wiring
harness from the brake band apply solenoid is shorted to ground.

Was a problem found and corrected?

Go to Step 26

—

18

The wiring harness between the transmission 16–way connector
terminal H53–15 and the transmission main case connector
terminal M7–4(C) is shorted to ground.

Was a problem found and corrected?

Go to Step 26

—

19

The wiring harness between the transmission 16–way connector
terminal H53–15 and the transmission main case connector
terminal M7–4(C) is open.

Was a problem found and corrected?

Go to Step 26

—

20

The brake band apply solenoid is faulty, or the internal wiring
harness from the brake band apply solenoid is open.

Was a problem found and corrected?

Go to Step 26

—

21

The wiring harness between the PCM connector terminal J1–A16
and transmission 16–way connector terminal H53–13 is shorted
to ground.

Was a problem found and corrected?

Go to Step 26

—

22

The wiring harness between the transmission 16–way connector
terminal H53–13 and the transmission main case connector
terminal M7–2(B) is shorted to ground.

Was a problem found and corrected?

Go to Step 26

—

7A1–72 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P1850 Brake Band Apply Solenoid Malfunction  (Cont’d)

Step

No

Yes

Action

23

The wiring harness between the PCM connector terminal J1–A16
and the 16–way connector terminal H53–13 is open.

Was a problem found and corrected?

Go to Step 26

—

24

The wiring harness between the transmission 16–way connector
terminal H53–13 and the transmission main case connector
terminal M7–2(B) is open.

Was a problem found and corrected?

Go to Step 26

—

25

Check every connection at the PCM.
If OK, replace the PCM. Refer to Powertrain Control Module
(PCM) in Automatic Transmission (4L30–E) section.

Is the replacement complete?

Go to Step 26

—

26

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

then “Clear Info” function and ensure the following conditions
are met:

D

The brake band apply solenoid is commanded “on” and the
volts drop to zero.

D

The brake band apply solenoid is commanded “off” and the
volts increase to B+.

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

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–73

DTC P1860 TCC Solenoid Electrical

D07RW010

Circuit Description

The PCM allows current to flow through the solenoid coil
according to the duty cycle (percentage of “on” and “off”
time).  This current flow through the solenoid coil creates
a magnetic field that magnetizes the solid core.  The
magnetized core attracts the check ball to seat against
spring pressure.  This blocks the exhaust for the TCC
signal fluid and allows 2–3 drive fluid to feed to TCC signal
circuit.  The TCC signal fluid pressure acts on the TCC
regulator valve to regulate line pressure and to apply fluid
pressure to the torque converter clutch shift valve.  When
the TCC shift valve is in the apply position, regulated
apply fluid pressure is directed through the TCC valve to
apply the torque converter clutch.  The TCC solenoid is
used in conjunction with the TCC solenoid to regulate fluid
to the torque converter.  The TCC solenoid is attached to
the valve body within the transmission.
This DTC detects a continuous open or short to ground or
ignition in the TCC circuit or the TCC solenoid.  This is a
type “D” DTC.

Conditions For Setting The DTC

D

Battery voltage is between 10 and 16 volts.

D

No shift solenoid A DTC P0753.

D

No shift solenoid B DTC P0758.

D

Ignition is “on”, Engine “run”.

D

The PCM commands the solenoid “on” and the
voltage remains low (zero volts).

D

The PCM commands the solenoid “off” and the
voltage remains high (B+).

D

All conditions met for 0.25 seconds.

Action Taken When The DTC Sets

D

Inhibit TCC engagement.

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

Inspect the wiring for poor electrical connections at
the PCM and at the transmission 16–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.

Test Description

The numbers below refer to the step numbers on the
diagnostic chart:
2. This test checks for voltage to the solenoid.
3. This test checks the ability of the PCM and wiring to

control the ignition circuit.

8. This test checks the resistance of the TCC solenoid

and the internal wiring harness.

7A1–74 TRANSMISSION CONTROL SYSTEM (4L30–E)

DTC P1860 TCC Solenoid Electrical 

Step

Action

Yes

No

1

1. Install the scan tool.
2. With the engine “on”, 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”.

Go to Step 2

Go to Step 3

2

Using the J39200 DVOM, back probe between PCM connector
terminals J2–D2 and J2–C8.

Is the voltage 0 ?

Go to Step 4

Go to Step 5

3

1. Apply brake pedal and select transmission range “D”.
2. Do a test drive, and increase the vehicle speed to TCC “on” at

4th.

Does the scan tool display DTC P1860 at TCC “ON”?

Go to Step 9

Go to Diagnostic

Aids

4

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

PCM connector terminals J2–D2 and J2–C8.

Is the resistance within 18 – 20 ohms?

Go to Step 6

Go to Step 7

5

The wiring harness between PCM connector terminal J2–D2 and
transmission adapter case connector terminal M6–4(A) is shorted
to voltage.

Was a problem found and corrected?

Go to Step 18

Go to Step 19

6

Intermittent condition.
Check the wiring harness and terminals between PCM connector
J2 and transmission adapter case connector M–6.

Was a problem found and corrected?

Go to Step 18

Go to Step 19

7

1. Disconnect the transmission 16–way connector H–53.
2. Using the J39200 DVOM, measure the resistance between

terminal H53–8 and ground.

Is the resistance within 18 – 20 ohms?

Go to Step 15

Go to Step 8

8

1. Disconnect the transmission adapter case connector M–6.
2. Using the J39200 DVOM, measure the resistance between

terminal M6–4(A) and ground.

Is the resistance within 18 – 20 ohms?

Go to Step 16

Go to Step 17

9

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

terminals J2–D2 and J2–C8.

Is the resistance within 18 – 20 ohms?

Go to Step 18

Go to Step 10

10

1. Disconnect the transmission 16–way connector H–53.
2. Using the J39200 DVOM, measure the resistance between

terminal H53–8 and ground.

Is the resistance within 18–20 ohms?

Go to Step 12

Go to Step 11

11

1. Disconnect the transmission adapter case connector M–6.
2. Using the J39200 DVOM, measure the resistance between

terminal M6–4(A) and ground.

Is the resistance within 18–20 ohms?

Go to Step 13

Go to Step 14