Isuzu N-Series. Manual — part 451
6E-140 EMISSION AND ELECTRICAL DIAGNOSIS
Quick Warm System (QWS) Malfunction
N6A1676E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-141
N6A1276E
6E-142 EMISSION AND ELECTRICAL DIAGNOSIS
Inspection
1. Exhaust Throttle Valve
Working Check
Actuate the exhaust brake with the engine idling
and make sure that you hear the valve strike on the
stopper.
Airtight Check
Apply a negative pressure of -53.3 — -93.3 kPa (-
400 — -700 mmHg/-7.73 — -13.54 psi) to the pow-
er chamber by means of a vacuum pump and
make sure of the smooth opening/closing of the ex-
haust brake valve.
Apply a negative pressure of -86.7 — -93.3 kPa (-
650 — -700 mmHg/-12.57 — -13.54 psi) to the
power chamber using a vacuum pump and make
sure the average of measurements at Point A and
Point B of the clearance between valve and body is
as follows:
0.4 — 0.6 mm (0.016 — 0.024 in) (Minimum: 0.4
mm/0.016 in)
If the clearance is out of this range adjust with the
adjusting bolt.
2. 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.
3. Exhaust Brake Magnetic Valve
Inspection
Connect the magnetic valve connector terminal
No.1 and No.2 to (+) terminal and (-) terminal of
battery respectively, and check the continuity be-
tween the ports.
N6A1248E
Legend
1. Power chamber
2. Adjust bolt
3. Valve
4. Close
Legend
1. Vacuum hose
N6A1249E
N6A1250E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-143
4. Accelerator Switch (2-pole connector type)
Inspection
1) Check the continuity between the switch con-
nector terminals.
2) Check the smooth move of the pushrod. If the
check result is abnormal, repair or replace the
pushrod.
Caution:
When measuring resistance with a circuit tester, be
careful not to damage or deform the terminals.
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.
Tightening torque: 1.3 N
⋅m (0.13 kg⋅m/11.5
lb
⋅in)
5. 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:
Legend
A. Inlet (vacuum pump)
B. Outlet (unit)
C. EXH (air filter)
N6A1247E
N6A1252E
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