Isuzu N-Series. Manual — part 422
6E-24 EMISSION AND ELECTRICAL DIAGNOSIS
How to read flashing of the indicator lamp:
The two-digit self-diagnosis code flashes starting from
ten’s figure to indicate the self-diagnosis code.
Please read the self-diagnosis code from the flashing.
If the plural self-diagnosis codes are indicated, the same
self-diagnosis code is flashed repeatedly in steps of
three times.
Please read it correctly.
• Diagnostic Trouble Code (DTC) outputting is done
in decreasingly order of DTC number.
• Indication is changed over on completion of output
DTC indication.
• DTC indicator is stopped with diagnostic switch be-
ing off.
• When there is no DTC output, “1” is outputted in
normal DTC code.
• After indicating 3 times pear 1 DTC, shift is con-
ducted to the next DTC. (After making a round, the
indications are repeated again.)
• In case of the same diagnostic code, it is used 1
DTC (3 times indication.)
Example Diagnosis Trouble Code Output
NO
TERMINAL NAME
6
DIAG CONTROL
7
CHECKER SIG
4, 5
CHECKER GND
N6A1666E
Legend
A. (For example) In case of indicate two digits figure
“DTC23”
B. Figure of ten
C. Figure of one
N6A1137E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-25
Flashing of Indicator Lamp
Diagnosis Trouble Code List
* Equipped with EGR and VSS
Legend
A. Right-hand drive
C. Terminal assignment of data link connector (DLC)
B. Left-hand drive
DTC#
TECH 2 STRING
P21
Rack Sensor Circuit Low
P22
Rack Sensor Circuit High
P13
Engine Coolant Temperature (ECT) Sensor Circuit High
P14
ECT Sensor Circuit Low
P31 *
Exhaust Gas Recirculation (EGR) Electronic Vacuum Regulating Valve (EVRV) Solenoid Circuit Low
P32 *
EGR EVRV Solenoid Circuit High
P41
Quick On Start (QOS) Relay Control Circuit Low
P42
QOS Relay Control Circuit High
P23
Magnetic Switch Control Circuit Low
P24
Magnetic Switch Control Circuit High
P26
Quick Warm System (QWS) Relay Control Circuit High
P33 *
Variable Swirl System (VSS) Control Circuit Low
P34 *
VSS Control Circuit High
P43
Aneroid Compensator Vacuum Switching Valve (VSV) Control Circuit Low
P35 *
EGR Quick Cut VSV Control Circuit Low
P36 *
EGR Quick Cut VSV Control Circuit High
P44
Aneroid Compensator VSV Control Circuit High
P45
Engine Speed Sensor Circuit Low
P61
Barometric Sensor Circuit Error
P52
Electronically Erasable Programmable Read Only Memory (EEPROM) Error
N6A1667E
6E-26 EMISSION AND ELECTRICAL DIAGNOSIS
Error Classified
Trouble
Code
Diagnostic Condition
Return
Condition
Back Up
Judging
Time
Relay:
QWS
+B short
P26
Output TR Monitor
When
forward
normal
QWS: R/L
Non-Continuity.
0.52 sec
VSV:
VSS
Harness Open
GND short
*P33
Output TR Monitor
When
forward
normal
VSS: VSV
Output stop.
0.52 sec
+B short
*P34
VSV:
ANEC
ON
Harness Open
GND short
P43
Output TR Monitor
When
forward
normal
ANECON: VSV
Output stop.
0.52 sec
+B short
P44
VSV:
EGR
Quick
Harness Open
GND short
*P35
Output TR Monitor
When
forward
normal
EVRV: EGR
VSV: EGR Quick Cut
The above output stops.
0.52 sec
+B short
*P36
Atmo-
spheric
Pres-
sure
Sensor
Output Abnor-
mal
P61
1.5V (49.9 kPa / 374
mmHg / 7.23 psi) or
lower, or 4.5V (160 kPa
/ 1200 mmHg / 23.2
psi) or higher detected.
When
forward
normal
EVRV: EGR
VSV: EGR Quick Cut
The above output stops.
ANECON: VSV is actu-
ated.
0.52 sec
ECM
EEPROM
error
P52
Check when ECM is
started and when Trou-
ble Code is written.
When
forward
normal
Trouble Code other than
52 (EEPROM error) not
indicated.
Normal
P12
No other trouble code.
No history of this diagno-
sis recorded
—
Rack
Sensor
Harness Open
GND short
P21
Rack Voltage 0.3V or
lower, Engine speed
600 — 900rpm, and
water Temp. 0
°C
(32
°F) or higher are
detected for 3 seconds
running.
When
forward
normal
EVRV: EGR
VSV: EGR Quick Cut
VSV: VSS
The above outputs stop.
R/L: QWS Non-continuity
Idle position output stop.
The above outputs stop.
Rack Learning valve: 0
3.52 sec
+5V short
Rack Sensor
Power Voltage
P22
5V or higher Rack Volt-
age detected.
0.52 sec
Water
Temp
Sensor
Harness Open
+B short
P13
-79
°C/-110°F (390kΩ)
or lower, or 120
°C/
248
°F (115kΩ) or
higher detected.
When
forward
normal
EVRV: EGR
VSV: EGR Quick Cut
VSV: VSS
MV: Timing Advance
The above outputs stop.
VSV: ANECON is actu-
ated
QOS: 0
°C or lower con-
trol
0.52 sec
GND short
P14
EVRV:
EGR
Harness Open
GND short
*P31
Output TR Monitor
When
forward
normal
EVRV: EGR
VSV: EGR Quick Cut
The above outputs stop.
1.57 sec
+B short
*P32
Relay
QOS
Harness Open
GND short
P41
Output TR Monitor
When
forward
normal
QOS: RL Non-continuity
0.52 sec
+B short
P42
EMISSION AND ELECTRICAL DIAGNOSIS 6E-27
* Equipped with EGR and VSS
Location of Sensor and Switch
Mag-
netic
Vol-
ume
Timing
Harness Open
P23
Output TR Monitor
When
forward
normal
Timing Advance: MV out-
put stop.
0.52 sec
GND short
+B short
P24
Harness Open
GND short
P45
Engine speed 0, Rack
Voltage
≥ 0.3V ≤ 0.57
is detected.
When
forward
normal
EVRV: EGR
VSV: EGR Quick Cut
VSV: VSS
R/L: QWS
The above outputs Idling
position output stop
when T/M POS SW out-
putted.
VSV: ANECON is actu-
ated
1.52 sec
Error Classified
Trouble
Code
Diagnostic Condition
Return
Condition
Back Up
Judging
Time
N6A1139E
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