Isuzu Trooper (1998-2002 year). Service manual — part 601
6E–52
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Exhaust Gas Recirculation (EGR) System Check
060RW135
Circuit Description
Introducing exhaust gas into the combustion chamber
lowers combustion temperatures and reduces the
formation of oxides of nitrogen (NOx) in the exhaust gas.
Lower combustion temperatures also prevent detonation.
Diagnostic Aids
The EGR valve chart is a check of the EGR system. An
EGR pintle constantly in the closed position could cause
detonation and high emissions of NOx. An EGR pintle
constantly in the open position would cause a rough idle.
6E–53
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
System Check
Step
Action
Value(s)
Yes
No
1
Move the valve up and down to check the slide
resistance.
Is the slide resistance large?
—
Go to
Step 8
Go to
Step 2
2
1. Set the transmission at “Park” or “Neutral”.
2. Put the engine in warming-up operation by idling.
(The engine temperature should be 80
°
C or more)
3. Disconnect the vacuum hose from the EGR valve.
4. Apply a vacuum of 250 mmHg to the EGR valve by
the vacuum pump (mighty pack).
Does the vibration due to engine operation become
larger?
—
Go to
Step 3
Go to
Step 9
3
1. Check if there is not any damage on the vacuum
hose from the vacuum pump to the EGR valve.
2. Install the vacuum pump (mighty pack) to the EGR
valve.
Does the vacuum became 250 mmHg or more at that
time?
250 mmHg or
more
Go to
Step 4
Go to
Step 8
4
Install the EGR valve and the vacuum hose formally
and increase the engine revolution speed to 3000 rpm.
Can both EGR valve 1 and EGR valve 2 be opened and
closed?
—
The system is
normal
Go to
Step 5
5
Measure the resistance of the VSV: EGR coil.
Is the resistance value in the range of 30
W
to 50
W
?
30
∼
50
W
Go to
Step 6
Go to
Step 10
6
Measure the resistance of the EVRV: EGR coil.
Is the resistance value in the range of 10
W
to 13
W
?
10
∼
13
W
Go to
Step 7
Go to
Step 11
7
Was the harness open or poor connection?
—
Go to
Step 12
Go to
Step 13
8
Replace the EGR valve ASM.
Is the action complete?
—
Verify repair
—
9
Clean or replace the EGR valve ASM.
Is the action complete?
—
Verify repair
—
10
Replace the EGR VSV.
Is the action complete?
—
Verify repair
—
11
Replace the EGR EVSV.
Is the action complete?
—
Verify repair
—
12
Repair the harness.
Is the action complete?
—
Verify repair
—
13
Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
—
Verify repair
—
6E–54
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
ECM Diagnostic Trouble Codes
The following table lists the diagnostic trouble codes
supported a Tech 2 and to flash.If any DTCs not listed
here are displayed by a Tech 2, the Tech 2 data may be
faulty; notify the Tech 2 manufacturer of any DTCs
displayed that are not included in the following table.
ECM Diagnostic Trouble Codes
DTC
using a
Tech 2
Flash DTC
Description
MIL
P0107
34
MAP Sensor Low Voltage
ON
P0108
34
MAP Sensor High Voltage
ON
P0112
23
Intake Air temp Sensor Low Voltage
ON
P0113
23
Intake Air temp Sensor High Voltage
ON
P0117
14
Engine Coolant Temp Sensor Low Voltage
ON
P0118
14
Engine Coolant Temp Sensor High Voltage
ON
P0121
33
Accel Position Sensor Rationality
ON
P0122
21
Accel Position Sensor Low Voltage
ON
P0123
21
Accel Position Sensor High Voltage
ON
P0182
15
Fuel Temp Sensor Low Voltage
ON
P0183
15
Fuel Temp Sensor High Voltage
ON
P0192
63
Rail Pressure Sensor Low Voltage
ON
P0193
63
Rail Pressure Sensor High Voltage
ON
P1193
64
RPCV Circuit Open/Short
—
P1194
61
Rail Pressure System Low Voltage
ON
P1195
61
Rail Pressure System High Voltage
ON
P1196
62
Rail Pressure System High Warning
ON
P0197
16
Oil Temp sensor Low Voltage
ON
P0198
16
Oil Temp sensor High Voltage
ON
P0201
51
Injector #1 Circuit Fault
ON
P0202
52
Injector #2 Circuit Fault
ON
P0203
53
Injector #3 Circuit Fault
ON
P0204
54
Injector #4 Circuit Fault
ON
P0217
22
High Coolant Temp Warning
ON
P1217
36
High Oil Temp Warning
ON
P0219
11
Engine Over Speed Warning
ON
P0336
43
Crank Position Sensor Out of Syncro
ON
P0337
43
Crank Position Sensor No Signal
ON
P0341
41
Cam Position Sensor Out of Syncro
ON
P0342
41
Cam Position Sensor No Signal
ON
P0380
66
Glow Relay Circuit Open/Short
—
P0381
67
Glow Lamp Circuit Open/Short
—
P1403
32
EGR EVRV Fault
—
P1404
31
EGR VSV Circuit
—
P0405
26
EGR Pressure Sensor Low Voltage
ON
P1405
37
EGR EVRV Circuit Open/Short
—
P0406
26
EGR Pressure Sensor High Voltage
ON
6E–55
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
DTC
using a
Tech 2
Flash DTC
Description
MIL
P0475
71
EXH #1 VSV Circuit Open/Short
—
P1475
71
EXH #2 VSV Circuit Open/Short
—
P1485
74
Intake Throttle Position Sensor Low Voltage
ON
P1486
74
Intake Throttle Position Sensor High Voltage
ON
P1487
73
Intake Throttle System Circuit Open/Short
ON
P1488
72
Intake Throttle Motor Control Circuit Signal Gap
—
P0502
24
Vehicle Speed Sensor No Signal
ON
P0510
75
Idle SW Malfunction, Open Circuit
ON
P1510
75
Idle SW Malfunction, Short Circuit
ON
P0562
35
System Voltage Too Low
ON
P1562
35
System Voltage Too Low at Cranking
ON
P1587
25
Brake SW Malfunction [B]
—
P1588
25
Brake SW Malfunction [A]
ON
P0601
55
ECM Checksum Error
ON
P1626
56
Immobilizer No Signal
ON
P1631
56
Immobilizer Wrong Signal
ON
P1648
56
No Security Code Entered
ON
P1649
56
Immobilizer Function not Programmed
ON
P0650
77
Check Engine Lamp Circuit Open/Short
—
P0654
27
Techometer Circuit Open/Short
—
P1655
17
Thermo Relay Circuit Open/Short
—
P1657
76
ECM Main Relay Circuit Open/Short
—
P1589
47
TransMission SW Circuit Open/Short
—
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