Isuzu N-Series. Service manual — part 462
6E-184 EMISSION AND ELECTRICAL DIAGNOSIS
Resistance value
Notice:
Resistance value is difference according to the engine temperature (condition of engine warming up).
Inspection Point
Resistance Value
(k
Ω)
Reference
Connector
Pin No.
2 pin Black
2
←→ 1
37 to 44 (for 12 volt)
159 to 169 (for 24 volt)
SIG
←→ GND
1
←→ Body
∞
SIG
←→ Body
Step
Action
Value
YES
NO
1
Was the “Diagnostic system check” per-
formed?
—
Go to diagnostic
system check
2
Using the DVM, check the resistance of the
VSV.
Does the DVM read the following Value?
37 — 44
Ω
159 — 169
Ω
3
1. Ignition “OFF”.
2. Disconnect the ECM connector from
ECM.
3. Check the short to voltage of VSV circuit
between the ECM and VSV connector.
4. Repair if necessary.
Has DTC 32 been corrected?
—
4
Replace the VSV.
Is the action complete?
—
—
5
Replace the ECM.
Is the action complete?
—
—
6
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”.
Does DTC 32 come normal condition?
—
7
Is any current trouble other than DTC 32 dis-
played by indicator light?
—
Go to trouble code
section
Trouble code clear
EMISSION AND ELECTRICAL DIAGNOSIS 6E-185
DTC-41 Quick On Start (QOS) Relay Control Circuit Low Voltage
N6A1333E
6E-186 EMISSION AND ELECTRICAL DIAGNOSIS
Location of Relay
Legend
1. Relay box (Installed on the left side rear of the
cab)
N6A1184E
NO
RELAY NAME
X-20
Glow plug
X-21
Starter
X-22
Marker lamp
X-23
Rear fog
X-24
A/C COMP, 4WD ind. lamp
X-25
Exh, Brake control
X-26
CSD, A/C ON SIGNAL
X-27
Condenser fan
X-28
Exh. Brake cut
EMISSION AND ELECTRICAL DIAGNOSIS 6E-187
Inspection for prestroke power cut relay
Resistance value
Legend
A. QOS relay
N6A1214E
Legend
A. QOS relay
N6A1215E
Inspection Point
Resistance
Reference
Inspection
relay unit
4
←→ 5
23 (
Ω) (for 12 volt)
100 (
Ω) (for 24 volt)
2
←→ 3
∞
Not be supplied electricity to coil
Below 0.5 (
Ω)
Be supplied electricity to coil
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