Isuzu N-Series. Manual - part 466

6E-200 EMISSION AND ELECTRICAL DIAGNOSIS

Exhaust Brake Malfunction (Exhaust Brake only)

N6A1679E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-201

N6A1348E

6E-202 EMISSION AND ELECTRICAL DIAGNOSIS

N6A1349E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-203

Inspection

1. 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.

Caution:
When measuring resistance with a circuit tester, be
careful not to damage or deform the terminals.

2. 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 power
chamber by means of a vacuum pump and make
sure of the smooth opening/closing of the exhaust
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 fol-
lows:
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.

Legend

A. Inlet (Vacuum pump)
B. Outlet (unit)

C. EXH (air filter)

N6A1247E

N6A1248E

Legend

1. Power chamber
2. Adjust bolt
3. Valve
4. Close

N6A1249E