Opel Frontera UBS. Manual - part 208

 

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Opel Frontera UBS. Manual - part 208

 

 

5A–45

BRAKE CONTROL SYSTEM

Chart B-5 G-Sensor Circuit (DTC 21)

Step

Action

Yes

No

1

Vehicle placed horizontal.

Is the resistance between the G sensor connector terminals 1 and
2 within 4.0-6.0 k

W

?

Check harness

connector for

short.

Fault found :

Repair , and

perform system

self-check.

No fault found :

replace EHCU.

Go to Step 3

Go to Step 2

2

Is the bracket installed horizontally?

Go to Step 4

Repair or replace

bracket.

Go to Step 4

3

Remove G sensor.

Is the resistance between the G sensor connector terminals 1 and
2 within 1.0-2.0 k

W

 when G sensor is horizontal?

Go to Step 4

Replace G

sensor.

Go to Step 5

4

Measure resistance between G sensor connector terminals 1 and
2 within 4.0-6.0 k

W

 when G sensor tilted to 30

°

 or more?

Harness between

EHCU and G

sensor is faulty

and short.

Repair the

harness

Go to Step 5

Replace G

sensor.

Go to Step 5

5

1. Reconnect all components and ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 5

5A–46

BRAKE CONTROL SYSTEM

Chart B-6 Abnormal Transmission Input (DTC 23)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector.

Is there continuity between EHCU connector terminal 6 to 15
(Gear position-P(A/T), N(M/T))?

Shorted switch

harness.

Repair switch or

harness.

Go to Step 6

Go to Step 2

2

Is the vehicle an A/T model?

Go to Step 3

Go to Step 4

3

Turn the key on and measure the voltage between EHCU
connector terminal 6 and 15.

Is the 6V under when the gear position is L, and R(Battery voltage
12V)?

Go to Step 5

Transmission SW

trouble.

Disconnected

harness.

Repair SW and

harness.

Go to Step 6

4

Turn the key on and measure the voltage between EHCU
connector terminal 6 and 15.

Is the 9.6V over when the gear position is 1, 2, R(Battery voltage
12V)?

Go to Step 5

Transmission SW

trouble.

Disconnected

harness.

Repair SW and

harness.

Go to Step 6

5

Is there 6.6 to 9.0V when the gear position is 3, 4, 5 and N(M/T) or
2,3,D,N and P(A/T)(Battery voltage 12V)?

Suspected

harness/

connector short

power

source/GND.

Suspected

shorted

transmission SW.

Fault found:

repair, and

perform system

self-check. 

No fault found:

replace EHCU.

Go to Step 6

Transmission SW

trouble.

Disconnected

harness.

Repair SW and

harness.

Go to Step 6

6

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 6

5A–47

BRAKE CONTROL SYSTEM

Chart B-7 Transfer Monitor (DTC 24)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector.

Is the EHCU connector terminal 9 line normally?

Go to Step 2

Repair

Go to Step 3

2

Is the TOD ECU or 4WD controller normal?

Replace EHCU.

Go to Step 3

Repair or replace

TOD ECU or

4WD contrder.

Go to Step 3

3

1. Reconnect all components, ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 3

Chart B-8 EHCU Pump Motor And Motor Relay Circuit (DTC 32)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector.
3. Measure voltage between EHCU connector terminal 13 and

body ground.

Is the voltage equal to battery voltage?

Go to Step 2

Repair

fuse/harness

between battery

and EHCU

connector

terminal 13.

Go to Step 3

2

Is there continuity between EHCU connector terminal 12 and
ground?

Go to Step 3

Repair between

EHCU connector

terminal 12 and

ground.

Go to Step 3

3

1. Reconnect all components and ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 3

Chart B-9 EHCU Pump Valve And Valve Relay Circuit (DTC 35)

Step

Action

Yes

No

1

1. Turn the key off.
2. Disconnect EHCU connector.
3. Measure voltage between EHCU connector terminal 14 and

body ground.

Is the voltage equal to battery voltage?

Replace EHCU.

Go to Step 2

Repair fuse and

harness EHCU

connector

terminal 14 and

battery.

Go to Step 2

2

1. Reconnect all components and ensure all components are

properly mounted.

2. Clear diagnostic trouble code.

Was this step finished?

Repeat the “Basic

diagnostic flow

chart.”

Go to Step 2

5A–48

BRAKE CONTROL SYSTEM

Chart B-10 FL Isolation Solenoid Valve Abnormality (DTC 41)

Step

Action

Yes

No

1

Was the “EHCU Connector Pin-out Checks” performed?

Go to Step 2

Go to “EHCU

Connector

Pin-out Checks”.

2

Is the EHCU connector free from damage or corrosion?

Go to Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart”.

3

1. Replace the EHCU.
2. Reconnect all component, ensure all component are properly

mounted.

Was this step finished?

Repeat the “Basic

Diagnostic Flow

Chart”.

Go to Step 3

Chart B-11 FL Dump Solenoid Valve Abnormality (DTC 42)

Step

Action

Yes

No

1

Was the “EHCU Connector Pin-out Checks” performed?

Go to Step 2

Go to “EHCU

Connector

Pin-out Checks”.

2

Is the EHCU connector free from damage or corrosion?

Go to Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart”.

3

1. Replace the EHCU.
2. Reconnect all component, ensure all component are properly

mounted.

Was this step finished?

Repeat the “Basic

Diagnostic Flow

Chart”.

Go to Step 3

Chart B-12 FR Isolation Solenoid Valve Abnormality (DTC 43)

Step

Action

Yes

No

1

Was the “EHCU Connector Pin-out Checks” performed?

Go to Step 2

Go to “EHCU

Connector

Pin-out Checks”.

2

Is the EHCU connector free from damage or corrosion?

Go to Step 3

Repair the
connector.

Repeat the “Basic

Diagnostic Flow

Chart”.

3

1. Replace the EHCU.
2. Reconnect all component, ensure all component are properly

mounted.

Was this step finished?

Repeat the “Basic

Diagnostic Flow

Chart”.

Go to Step 3

 

 

 

 

 

 

 

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