Isuzu N-Series. Service manual — part 467
6E-204 EMISSION AND ELECTRICAL DIAGNOSIS
3. Intake Throttle Valve
Working Check
Disconnect the vacuum hose from the actuator and
try to move the rod by hand, making sure of the
smooth move of the rod.
4. EXHAUST GAS RECIRCULATION (EGR) SYS-
TEM MALFUNCTION4. Vacuum Switching Valve;
Intake Throttle
Inspection
Connect the vacuum switching valve connector
terminals No.1 and No.2 to (+) terminal and (-) ter-
minals of battery, respectively, and check the con-
tinuity between the ports.
If the check result is abnormal, repair or replace the
valve.
5. Accelerator Switch (2-pole connector type)
Inspection
1) Check the continuity between the switch con-
nector terminals.
Caution:
When measuring resistance with a circuit tester, be
careful not to damage or deform the terminals.
2) Check the smooth move of the pushrod. If the
check result is abnormal, repair or replace the
pushrod.
Legend
1. Vacuum hose
N6A1250E
N6A1251E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-205
Removal
1) Accelerator Switch
Disconnect the connector.
Loosen the lock nut.
Turn the switch to remove.
Reinstallation
To install, follow the removal procedure in reverse
order:
1) Drive the threaded part of the switch until its
end surface becomes flush with that of the
bracket side of nut.
2) Tighten the lock nut.
Tighten:
• Lock nut to 1.3 N
⋅m (0.13 kg⋅m/11.5 lb⋅in)
N6A1252E
6E-206 EMISSION AND ELECTRICAL DIAGNOSIS
Exhaust Gas Recirculation (EGR) System Malfunction
N6A1680E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-207
Inspection
1. Thermosensor (Engine coolant temperature)
Soak the temperature sensitive part of a ther-
mosensor in the water, and while changing the wa-
ter temperature, make sure the resistance is
changed as the following graph shows:
2. Vacuum Switching Valve (VSV)
Resistance Check
Check the resistance between the VSV connector
terminals using a circuit tester.
Cold Resistance
: 37 — 44 (
Ω) (for 12 volt model)
: 159 — 169 (
Ω) (for 24 volt model)
Connect battery voltage between VSV connector
terminals and make sure of the continuity between
the ports.
Airtight Check
Apply negative pressure to the negative pressure
input port as illustrated on the left.
Although there is leakage, it is no problem if the
negative pressure rises to -46.7 kPa (-350 mmHg /
-6.77 psi) or more.
Legend
1. Resistance (k
Ω)
2. ECT
°F (°C)
N6A1254E
N6A1255E
Legend
1. 2 Pin
2. Port
N6A1264E
N6A1265E
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