cooling ISUZU AXIOM 2002 Service Owner's Guide

ENGINE COOLING (6VE1 3.5L)6B±7
Thermostat
Thermostat and Associated Parts
031RW001
Legend
(1) Thermostat Housing
(2) Thermostat
(3) Outlet Pipe
Removal
1. Disconnect battery ground cable.
2. Drain engine coolant from the radiator and engine.
3. Disconnect radiator hose from the inlet pipe.
4. Remove thermostat housing.
5. Remove thermostat(2).
Inspection
Suspend the thermostat in a water±filled container using
thin wire. Place a thermometer next to the thermostat.
Do not directly heat the thermostat.
Gradually increase the water temperature. Stir the water
so that the entire water is same temperature.
031RS003Confirm the temperature when the valve first begins to
open.
Valve opening temperature 74.5C ~ 78.5
C
(166.1
F ~ 173.3
F)
Confirm the temperature when the valve is fully opened.
Valve full open temperature and lift More than
8.5mm (0.33 in) at 90
C (194
F)
Make necessary repair and parts replacement if extreme
wear or damage is found during inspection.
Installation
1. Install thermostat into the outlet pipe(4) making sure
that the air hole is in the up position.
2. Install thermostat housing and tighten bolts to the
specified torque.
Torque: 25 N´m (18 lb ft)
3. Installation rubber hose.
4. Replenish engine coolant (EC).
5. Start engine and check for EC leakage.

6B±8
ENGINE COOLING (6VE1 3.5L)
Radiator
Radiator and Associated Parts
110RW010
Legend
(1) Oil Cooler Hose For Automatic Transmission
(2) Radiator Hose
(3) Fan Guide, Lower(4) Reserve Tank Hose
(5) Radiator Assembly
(6) Reserve Tank
Removal
1. Disconnect battery ground cable.
2. Loosen a drain plug(2) to drain EC.
3. Disconnect oil cooler hose(1) on automatic
transmission (A/T).
4. Disconnect radiator inlet hose and outlet hose from
the engine.
110RW002
5. Remove fan guide(1), clips(3) on both sides and the
bottom lock, then remove fan guide lower(3) with fan
shroud(4).
110RW001

ENGINE COOLING (6VE1 3.5L)6B±9
6. Disconnect the reserve tank hose(4) from radiator.
110RX001
7. Lift up and remove the radiator assembly with hose,
taking care not to damage the radiator core with a fan
blade.
8. Remove rubber cushions on both sides at the bottom.
Inspection
Radiator Cap
Measure the valve opening pressure of the pressurizing
valve with a radiator filler cap tester.
Replace the cap if the valve opening pressure is outside
the standard range.
Valve opening pressure kPa (psi) 93.3 ~ 122.7
(13.5 ~17.8)
Cap tester: J±24460±01
Adapter: J±33984±A
Check the condition of the vacuum valve in the center of
the valve seat side of the cap. If considerable rust or dirt is
found, or if the valve seat cannot be moved by hand, clean
or replace the cap.
Valve opening vacuum kPa (psi) 0 ~ 6.9 (0 ~ 1.0)
110RS006
Radiator Core
1. A bent fin may result in reduced ventilation and
overheating may occur. All bent fins must be
straightened. Pay close attention to the base of the fin
when it is being straightened.
2. Remove all dust, bugs and other foreign material.
Flushing the Radiator
Thoroughly wash the inside of the radiator and the engine
coolant passages with cold water and mild detergent.
Remove all signs of scale and rust.
Cooling System Leakage Check
Use a radiator cap tester to force air into the radiator
through the filler neck at the specified pressure of 150 kPa
(22 psi) with a cap tester:

Leakage from the radiator

Leakage from the coolant pump

Leakage from the water hoses

Check the rubber hoses for swelling.

6B±10
ENGINE COOLING (6VE1 3.5L)
Cap tester: J±24460±01
Adapter: J±33984±A
110RX002
Installation
1. Install rubber cushions on both sides of radiator
bottom.
2. Install radiator assembly with hose, taking care not to
damage the radiator core with a fan blade.
3. Connect reserve tank hose (4).
4. Install lower fan guide (3).
5. Connect radiator inlet hose and outlet hose to the
engine.
6. Connect oil cooler hose (1) to automatic
transmission.
110RX001
7. Connect battery ground cable.
8. Pour engine coolant up to filler neck of radiator, and
up to MAX mark of reserve tank.
110RW012Important operation (in case of 100% engine coolant
change) procedure for filling with engine coolant.
Engine Coolant Filling Up Procedure
1. Make sure that the engine is cool.
WARNING: WHEN THE COOLANT IS HEATED TO A
HIGH TEMPERATURE, BE SURE NOT TO LOOSEN
OR REMOVE THE RADIATOR CAP. OTHERWISE YOU
MIGHT GET SCALDED BY HOT VAPOR OR BOILING
WATER. TO OPEN THE RADIATOR CAP, PUT A
PIECE OF THICK CLOTH ON THE CAP AND LOOSEN
THE CAP SLOWLY TO REDUCE THE PRESSURE
WHEN THE COOLANT HAS BECOME COOLER.
2. Open radiator cap pour coolant up to filler neck.
3. Pour coolant into reservoir tank up to ªMAXº line.
4. Tighten radiator cap and start the engine. After idling
for 2 to 3 minutes, stop the engine and reopen radiator
cap. If the water level is lower, replenish.
5. After replenishing with coolant tighten radiator cap,
warm up the engine at about 2000 rpm. Set heater
adjustment to the highest temperature position, and
let the coolant circulate also into heater water system.
6. Check to see the thermometer, continuously idle for 5
minutes and stop the engine.
7. When the engine has been cooled, check filler neck
for water level and replenish if required. Should
extreme shortage of coolant is found, check the
coolant system and reservoir tank hose for leakage.
8. Pour coolant into the reservoir tank up to ªMAXº line.

ENGINE COOLING (6VE1 3.5L)6B±11
Drive Belt and Cooling Fan
Drive Belt and Associated Parts
015RW005
Legend
(1) Crankshaft Pulley
(2) Generator
(3) Power Steering Pump(4) Water Pump and Cooling Fan Pulley
(5) Idle Pulley
(6) Tension Pulley
(7) Drive Belt
The drive belt adjustment is not required as automatic
drive belt tensioner is equipped.
Removal
Move the tension pulley drive belt loosen side, remove the
drive belt.
Inspection
Check drive belt for wear or damage, and replace with a
new one as necessary.
Installation
Install cooling fan assembly and tighten bolts/nuts to the
specified torque.
Torque : 22 N´m (16 lb ft) for fan pulley and fan
bracket.
Torque : 7.5 N´m (66.4 lb in) for fan and clutch
assembly.

6B±12
ENGINE COOLING (6VE1 3.5L)
Main Data and Specifications
General Specifications
A/T
Cooling systemEngine coolant forced circulation
RadiatorTube type corrugated (2 tube in row)
Heat radiation capacity85,500 kcal/h
Heat radiation area14.02m
(150.9ft
)
Radiator front area0.263m
(2.83ft
)
Radiator dry weight56N (12.6lb)
Radiator cap valve opening pressure93.3 ~ 122.7kpa (13.5 ~ 17.8psi)
Engine coolant capacity2.4lit (0.6 US gal)
Engine coolant pumpCentrifugal impeller type
Delivery300 (317) or more
Pump speed5000 + 50 rpm
ThermostatWax pellet type with air hole
Valve opening temperature74.5 ~ 78.5
C (166.1 ~ 173.3
F)
Engine coolant total capacity10.0lit (2.64 US gal)
Torque Specifications
E06RW004

ENGINE COOLING (6VE1 3.5L)6B±13
Special Tool
ILLUSTRATIONTOOL NO.
TOOL NAME
J±24460±01
Tester; radiator cap
J±33984±A
Adapter; radiator cap

6E±162
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Aids
DTC P0125 set indicates a faulty ECT sensor.
Comparing the engine coolant temperature displayed on
a Tech 2 with actual coolant temperature measured with a
thermometer may isolate this condition. If the displayed
engine coolant temperature is not close to the actual
coolant temperature, replace the ECT sensor.
Check for the following conditions:

Poor connection at PCM ± Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.

Damaged harness ± Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
display on the Tech 2 while moving connectors and
wiring harnesses related to the sensor. A change in the
display will indicate the location of the fault.
If DTC P0125 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage wince the DTC was last set.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. Comparing the engine coolant temperature displayed
on a Tech 2 with actual coolant temperature
measured with a thermometer may isolate this
condition. If the displayed engine coolant
temperature is not close to the actual coolant
temperature, replace the ECT sensor. If the
temperatures are close, the fault is intermittent;
refer to
Diagnostic Aids.
Engine Coolant Temperature

C
FOHMS
Temperature vs. Resistance Values
(approximate)
100212177
80176332
60140667
4511 31188
35951802
25772796
15594450
5417280
±52312300
±15521450
±30±2252700
±40±40100700
DTC P0125 ±ECT Excessive Time to Closed Loop Fuel Control

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
2Are any ECT sensor DTCs set?
Ð
Go to
applicable
ECT sensor
DTC chart
Go to Step 3
31. Allow the engine to cool completely.
2. Check the cooling system coolant level (refer to
Cooling and Radiator).
Is the coolant level OK?
ÐGo to Step 4Go to Step 9
41. Start the engine.
2. With the engine idling, monitor ªENG COOL TEMPº
display on the Tech 2.
Does ªENG COOL TEMPº increase to above the
specified value within 2 minutes?
21
C (70
F)
Refer to
Diagnostic
Aids
Go to Step 5
5Check for proper operation of the thermostat (refer to
Cooling and Radiator).
Is the thermostat operating correctly?
ÐGo to Step 6Go to Step 9

6E±163
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0125 ±ECT Excessive Time to Closed Loop Fuel Control

 
StepNo Ye s Value(s) Action
6Compare engine coolant temperature displayed on the
Tech 2 to the actual coolant temperature measured
with a thermometer. (Observe normal precautions
when opening the cooling system.)
Is the Tech 2 engine coolant temperature indication
close to the measured temperature?
ÐGo to Step 9Go to Step 7
71. Ignition ªOFFº.
2. Disconnect the PCM.
3. Using a DVM, measure the resistance of the ECT at
the PCM connector.
4. Compare the DVM reading with the chart in ªTest
Descriptionº.
Is the chart value approximately equal to the
thermometer reading?
ÐGo to Step 12Go to Step 8
8Check for high resistance in wiring related to the ECT
sensor. Also, check for poor connections at the ECT
sensor and the PCM.
Was a problem found?
ÐGo to Step 10Go to Step 11
9Refer to Cooling and Radiator for cooling system
diagnosis and repair condition as necessary.
Is the action complete?
ÐVerify repairÐ
10Replace the faulty terminal(s) or repair faulty wiring as
necessary.
Is the action complete?
ÐVerify repairÐ
11Replace the ECT sensor.
Is the action complete?
ÐVerify repairÐ
12Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain Control Module and Sensors for
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
ÐVerify repairÐ

6E±514
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Detonation/Sparks Knock Symptoms

StepActionValue(s)Ye sNo
1DEFINITION:
A mild to severe ping, usually worse under acceleration.
The engine makes sharp metallic knocks that change
with throttle opening.
Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
ÐVerify repairGo to Step 3
3Was a visual/physical check performed?
ÐGo to Step 4
Go to Visual/
Physical
Check
4If Tech 2 readings are normal (refer to Typical Scan
Values
) and there are no engine mechanical faults, fill
the fuel tank with a known quality gasoline that has a
minimum octane rating of 87 and re-evaluate the
vehicle performance.
Is detonation present?
ÐGo to Step 5Verify repair
51. Check the transmission range switch circuit. Use a
Tech 2 and be sure the Tech 2 indicates that the
vehicle is in drive with the gear selector in drive or
overdrive.
2. If a problem is found, diagnose and repair the
transmission range switch as necessary (refer to
4L30-E Automatic Transmission Diagnosis).
Was a problem found?
ÐVerify repairGo to Step 6
61. Check TCC operation. Refer to 4L30-E
Transmission Diagnosis
.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 7
71. Check for obvious overheating problems:

Low engine coolant.

Restricted air flow to radiator, or restricted
water flow through radiator.

Correct coolant solution should be a 50/50 mix
of approved antifreeze/coolant and water.
Refer to
Engine Cooling.

EGR operation. Refer to
DTC P0401.

ION sensing module fault.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 8
81. Ignition ªOFFº.
2. Disconnect the ION sensing module.
3. Disconnect the PCM.
Is the action complete?
ÐGo to Step 9Ð
9Check the ION sensing harness between the PCM
(F68) and ION sensing module circuit (RED Wire) at
the Kl line harness connector.
Was a problem found?
ÐVerify repairGo to Step 10