Isuzu 2008MY N Series Workshop Manual page 100

Step
1. Inspect the following conditions:
• Restricted air cleaner element, restricted
or collapsed air tubing between the air
cleaner and the intake manifold
• Any air induction leak
• Any contamination or objects that block
the MAF sensor inlet
• Skewed or slow MAF sensor
• Any water intrusion in the induction
system
• Any type of restriction in the exhaust
2
system
• A sticking intake throttle valve
• A sticking EGR valve
• A sticking turbocharger nozzle control
actuator
• Exhaust throttle valve or exhaust brake
valve for stuck condition. Refer to
Exhaust System in Section 1G Engine
Exhaust
2. Repair or replace as necessary.
Did you find and correct the condition?
1. Turn OFF the ignition.
2. Disconnect
connector.
3. Inspect for
connections and corrosion at the harness
connector of the MAF sensor (pins 1, 2 and 3
of J-38).
3
4. Disconnect the ECM harness connector.
5. Inspect for
connections and corrosion at the harness
connector of the ECM (pins 22, 23 and 69 of
J-14).
6. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Test each sensor circuit between the ECM
(pins 22, 23 and 69 of J-14) and the MAF
sensor (pins 1, 2 and 3 of J-38) for high
resistance.
4
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
Replace the MAF sensor. Refer to MAF/IAT Sensor
in Section 1J Induction.
5
Did you complete the replacement?
Action
the MAF sensor harness
an intermittent, for
an intermittent, for
Engine Control System (4HK1)
Value(s)
—
poor
—
poor
—
—
Yes
Go to Step 6 Go to Step 3
Go to Step 6 Go to Step 4
Go to Step 6 Go to Step 5
Go to Step 6
1A-97
No
—