09-10
RODIUS 2005.07
0452-01
ENGINE CONTROL SYSTEM
1) Starting Mode
When the ignition is turned ON, the ECM turns the fuel pump relay on for 1 second.
The fuel pump then builds fuel pressure.
The ECM also checks the Engine Coolant Temperature (ECT) sensor and the Throttle Position
(TP) sensor and determines the proper air/fuel ratio for starting the engine.
This ranges from1.5 to 1 at -36°C (-33°F) coolant temperature to 14.7 to 1 at 94°C
(201°F) coolant temperature.
The ECM controls the amount of fuel delivered in the starting mode by changing how long the
fuel injector is turned on and off.
This is done by ‘‘pulsing” the fuel injectors for very short times.
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c9004700880095008b004702c402c4008a00930096009a008c>d loop”.
2) Run Mode
3) Open Loop
When the engine is first started and it is above 690 rpm, the system goes into “open
loop” operation. In “open loop”, the ECM ignores the signal from the O2S and calculates
the air/fuel ratio based on inputs from the ECT sensor and the MAF sensor.
The ECM stays in “open loop” until the following conditions are met:
The O2 has a varying voltage output, showing that it is hot enough to operate properly.
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5900550047005c00b6006a00500055>
A specific amount of time has elapsed after starting the engine. -
-
-
4) Closed Loop
The specific values for the above conditions vary with different engines and are stored in the
Electronically Erasable programmable Read-Only Memory (EEPROM).
When these conditions are met, the system goes into “closed loop” operation. In “closed
loop”, the ECM calculates the air/fuel ratio (fuel injector on-time) based on the signals
from the O2 sensors.
This allows the air/fuel ratio to stay very close to 14.7 to 1.
5) Acceleration Mode
The ECM responds to rapid changes in throttle position and airflow and provides extra fuel.
The ECM responds to changes in throttle position and airflow and reduces the amount of fuel.
When deceleration is very fast, the ECM can cut off fuel completely for short periods of time.
6) Deceleration Mode
0-9
TRANSFER CASE
RODIUS 2005.07
3410-01
Ring, snap
Ring, snap
Ring, snap
Bearing
Hub, circular
Asm. -shaft, input
Plate, thrust
Gear, sun
Snap ring
Asm. -carrier (complete)
Hub reduction
Asm. -shaft, main
Clamp hose
Hose
Filter
Asm. -coil, electric
Asm. -cam/coil hsg.
Ring, snap
Armature
Hub, lockup
Spring, sleeve return
Collar, lockup
Sprocket, driving
Spring, return
Rail, shift
Fork, shift
Asm. -fork, shift
Cam, electric shift
Spring, torsion
Spacer
Shaft, shift
Ring, retaining
Asm. -case, transfer
Barb, breather 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.Decal
Shaft, output
Deflector, dust
Magnet
Ring snap
Sprocket lower
Spacer
Chain
Ring retaining
Bearing
Bearing
Cover
Bendable clip
Bolt, Metric
Seal, oil
Washer
Nut, Metric
Flange, companion
Seal, oil
Spacer
Tone wheel (upper)
Nut, Metric
Clip, “J”
Bolt, hex head
Bracket, relay mounting
Locking clip
Connector
Bolt, hex head
Capscrew, hex head
Asm. -motor, electric
Seal, oil
Plug, pipe
Sealing Compound 35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
01-3
FUSE AND RELAY
RODIUS 2005.07
8410-05
8410-05FUSES AND RELAYS
1. ENGINE COMPARTMENT FUSE AND RELAY
BOX
Fuse and relay box is located in the engine compartment, and the interior fuse box is located
under the driver side instrument panel. Especially, ICM box, an integrated circuit of relays, is
mounted along with STICS behind the driver side instrument panel.
Connector arrangement
Back of the fuse and relay box
(after removal)
Fuses and relays
01-5
FUSE AND RELAY
RODIUS 2005.07
8410-05
2. INTERIOR FUSE COMPARTMENT
The interior fuse box is located in the lower area of driver side instrument panel.
To check the fuses, open the driver side door and remove the fuse box cover. ·
·
01-6
RODIUS 2005.07
8410-05
FUSE AND RELAY
3. ICM(INTEGRATED CONTROL MODULE) BOX
COMPARTMENT
The ICM box is installed along with RK STICS on the bracket behind the Instrument panel
undercover.
It contains an integrated module with around 14 relays according to the vehicle model. Relays
in the module are installed on the integrated circuit with a safety circuit. This system operates
with small current (by using transistor) and minimizes the sparks that occur during operations
(connection/disconnection) of relays; therefore its durability and wear resistance has been
greatly increased compared to the conventional relays.
Relays in the ICM box cannot be replaced respectively; so when the internal components
(including relay) are defective, ICM box should be replaced as an assembly.
RK STICS
ICM box
01-7
FUSE AND RELAY
RODIUS 2005.07
8410-05
1) Printed Circuit Board Arrangement of ICM Box
The figure shows the internal arrangement of ICM box when the cover is removed and then
disassembled.
The relays cannot be disassembled and replaced respectively; so the ICM box should be
replaced as an assembly when any internal components are defective.
(1) Front view
