Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1123

3F–22

INTELLIGENT SUSPENSION

DTC5 Vehicle Speed Sensor Open Circuit or Short

Circuit Description

Output speed information is provided to the control unit
by the vehicle speed sensor. The vehicle speed sensor
produces a pulsing AC voltage. The AC voltage level
and number of pulses increases as the speed of the
vehicle increases. The control unit then converts the
pulsing voltage to vehicle speed.

Diagnostic Aids

• Inspect the wiring for poor electrical connections

between the control unit 22 way connector and the
speed sensor connectors. 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.

DTC5 Vehicle Speed Sensor Open Circuit or Short

Step

Action

Value(s)

Yes

No

1

1. Jack up and support the rear axle on the stand.

2. Change the transfer mode to 2WD, using the 4WD

push button switch on instrument panel.

3. Shift the transmission lever in a forward position

and rotate the rear wheels.

Does the speedo-meter operate?

—

Go to Step 2   

Go to Step 3   

2

1. Open the throttle and rev up engine speed.

2. Using a volt meter, measure the voltage between

the meter B connector I–2 terminals 7 and 16
(GND).

Does the voltage change alternately at the specified
values?

0V and 12V

Go to Step 7   

Go to Step 5   

3

1. Turn off the starter switch and disconnect the

control connectors C–50 and C–52.

2. Check the continuity between the vehicle speed

sensor connector terminal 3 and meter B
connector I–2 terminal 7.

Is there continuity?

—

Go to Step 4   

Go to Step 6   

4

1. Check the continuity between the control unit

connector C–50 terminal 1 and control unit
connector C–52 terminal 48.

Is there continuity?

—

Go to Step 5   

Go to Step 6   

5

Repair or replace the vehicle speed sensor.

—

Go to Step 8   

—

6

Repair the circuit between the vehicle speed sensor
connector terminal 3 and the meter B connector I–2
terminal 7 or the circuit between the control unit
connector C–52 terminal 48 and the speed sensor
connector terminal 3.

—

Go to Step 8   

—

7

Repair the circuit between the connector H–6 terminal
16 and the control unit connector C–52 terminal 48 or
replace the control unit.

—

Go to Step 8   

—

INTELLIGENT SUSPENSION

3F–23

About the vehicle speed sensor connector terminal 3.
Refer to 8D WIRING SYSTEM in BODY and
ACCESORIES

8

1. Reconnect all components, ensure all

components are properly mounted.

2. Clear the DTC.

Was this step finished?

—

Go to “Basic 

Diagnosis 

Flow." Go 

to 

Step 8   

Step

Action

Value(s)

Yes

No

3F–24

INTELLIGENT SUSPENSION

DTC6 Stop Lamp Switch Open Circuit or Short

Circuit Description

The brake switch is used to indicate brake pedal status.
The normally opened brake switch signal voltage circuit
is opened.
Brake switch supplies a B+ signal on circuit RED to the
control unit when the brakes are applied. The control
unit uses this signal to work dive control when the
brakes are applied.

Diagnostic Aids

• Inspect the wiring for poor electrical connections at

the control unit 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.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while
observing test equipment for a change.

• Check customer driving habits and/or unusual driving

conditions (i.e. stop and go, highway).

• Check brake switch for proper mounting and

adjustment.

DTC6 Stop Lamp Switch Open Circuit or Short

Step

Action

Value(s)

Yes

No

1

1. With the engine “off", turn the ignition switch “on".

If ABS code is set, check applicable fuse.

2. Apply then release the brake pedal.

Does the brake lamp come on when the brake pedal
is applied and does it come off when the brake   pedal
is released? 

—

Go to 

Diagnostic Aids Go 

to 

Step 2   

2

1. Connect the test light to ground.

2. Back probe ignition feed circuit terminal I–18

terminal 1 at the brake switch.

Is the test light “on"?

—

Go to Step 3   

Go to Step 4   

3

1. Connect the test light to ground.

2. Back probe circuit terminal I–18 terminal 4 at the

brake switch.

Is the test light “off"?

—

Go to Step 7   

Go to Step 5   

4

Repair the open in battery feed circuit terminal I–18
terminal 1 to the brake switch.
If fuse is open, check circuit terminal I–18 terminal 4
for a short to ground.
Is the replacement complete?

—

Go to Step 13   

—

5

Disconnect brake switch connector I–18 and ignition
switch “on".
Is the test light “on"?

—

Go to Step 8   

Go to Step 6   

6

Check the brake switch short (I–18 terminal 1 and I–
18 terminal 4).
Was a problem found?

—

Go to Step 9   

Go to Step 10   

7

Check circuit terminal I–18 terminal 4 for a short to
voltage.
Ignition switch “on".
Is the test light “on"?

—

Go to Step 8   

Go to Step 10   

8

1. Disconnect the control unit connector C–52.

2. Check circuit terminal I–18 terminal 4 for a short to

voltage.

Was a problem found?

—

Go to Step 13   

Go to Step 10   

INTELLIGENT SUSPENSION

3F–25

9

Replace the brake switch.
Is the replacement complete?

—

Go to Step 13   

—

10

1. Turn the ignition “off".

2. Reconnect the control unit connector C–52

Turn the ignition “on".

Does the brake lamp come on when the brake pedal
is applied and does it come off when the brake   pedal
is released? 

—

Go to 

Diagnostic Aids Go 

to 

Step 11   

11

Check the control unit for faulty or intermittent
connections.
Was a problem found and corrected?

—

Go to Step 13   

Go to Step 12   

12

Replace the control unit.
Is the replacement complete?

—

Go to Step 13   

—

13

1. After the repair is complete, clear the DTC.

2. Conduct a test drive.

3. Review the DTC.

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

—

Begin 

diagnosis 

again

Go to Step 1

Go to Repair 

verified 

Step

Action

Value(s)

Yes

No