Isuzu Rodeo UE. Service manual - part 574

8D–144

WIRING SYSTEM

Parts Location

D08RX069

Legend

(1) Cruise Pump & Actuator
(2) C–26
(3) H–12
(4) H–19
(5) (PCM) C–3
(6) Cruise Control Unit
(7) B–18
(8) I–31
(9) I–9

(10) I–46

(11) Starter SW

(12) I–18
(13) I–6
(14) I–14
(15) H–15, H–16, H–31, H–32
(16) Clutch Switch
(17) Brake Switch
(18) M–10
(19) Mode Switch
(20) M–16
(21) H–10
(22) B–8
(23) Throttle Valve

8D–145

WIRING SYSTEM

Diagnosis

The cruise control unit uses the cruise main indicator light
and diagnosis the failure, when the control unit detects
abnormality on the table below.

PART

POSSIBLE CAUSE

DETECTION PERIOD

DTC

Motor system short circuit

Energizing motor

1-1

Clutch system open circuit

Energizing clutch

1-2

Actuator

Clutch system open circuit

Energizing clutch

1-2

Mechanical defect

Cruise controlling

1-3

Close side of motor system open circuit

Cruise controlling

1-1

Cruise control unit

Close side of motor system open circuit

While starter SW on

1-4

Cruise control unit

Clutch output abnormality

While starter SW on

1-4

Vehicle speed sensor

Signal of vehicle speed disconnection

Cruise controlling

2-1

Vehicle s eed sensor

Signal of vehicle speed abnormality

Cruise controlling

2-1

Switch

Turning on switch at all times

While starter SW on

3-1

Switch

Turning on switch at the same time

While starter SW on

3-1

DTC : Diagnostic Trouble Code

DTC Display Condition

1. While starter switch on and vehicle speed is 0 km/h,

the DTC output begins in top priority by cancel switch
turn on and off being repeated three times for 2 sec.
while cruise main switch pushing on, and stops the
DTC output whether vehicle speed is more than 10
km/h or the resume switch is turned on.

2. The cruise control unit outputs the DTC(s) in order

from small figure of the code.

3. The header of display of DTC(s) is assumed 4 sec.,

and it is 2 sec. between different king of codes.

4. The DTC(s) are erased with the starter switch turned

off.

8D–146

WIRING SYSTEM

DTC Display Format

1. When no DTCs are detected. (The unit : sec.)

F08RW003

2. When two or more DTCs are detected. (The unit : sec.)

F08RW004

8D–147

WIRING SYSTEM

Diagnosis

DTC 1–1 Motor System Short Circuit

Step

Action

Value(s)

Yes

No

1

1. Turn the starter switch off.
2. Disconnect the actuator connector C-26.
3. Measure resistance between actuator side

connector terminal 1 and 2.

NOTE: If the control plate position is fully opened or
fully closed, resistance can not be measured.

Is the resistance within range specified in the value(s)
column?

More than

4.2

W

Go to Step 2

Replace the

actuator

2

Measure continuity between harness side connector
C-26 terminal 1 and the ground, terminal 2 and the
ground, and terminals 1 and 2.

Are the result same as specified in the value(s)
column?

No continuity

Replace the

control unit

Repair or

replace the

harness

DTC 1–2 Clutch System Open or Short Circuit

Step

Action

Value(s)

Yes

No

1

1. Turn the starter switch off.
2. Disconnect the actuator connector C-26.
3. Measure resistance between actuator side

connector terminal 3 and 4.

Is the resistance within range specified in the value(s)
column?

34.7 – 42.4

W

Go to Step 2

Replace the

actuator

2

1. Disconnect the brake switch connector I-18.
2. Check continuity between switch side connector

terminal 2 and 3.

Is there continuity between terminals?

—

Go to Step 3

Adjust or

replace the

switch

3

1. Reconnect the brake switch connector I-18
2. Check continuity between harness side connector

B-18 terminal 6 and I-18 terminal 3, C-26 terminal 4
and B-18 terminal 8.

Is there continuity between terminals?

—

Go to Step 4

Repair open

circuit

4

Check continuity between harness side connector
C-26 terminal 3 and ground, C-26 terminal 4 and
ground, B-18 terminals 6 and the ground.

Are the results same as specified in the value(s)
column?

No continuity

Replace the

control unit

Repair short

circuit