Isuzu N-Series. Service manual — part 440
6E-96 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-P42 Quick On Start (QOS) Relay Control Circuit High Voltage
N6A1212E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-97
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
6E-98 EMISSION AND ELECTRICAL DIAGNOSIS
Inspection for quick on start (QOS) 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
EMISSION AND ELECTRICAL DIAGNOSIS 6E-99
Step
Action
Value
YES
NO
1
Was the “on-board diagnostic (OBD) system
check” performed?
—
Go to self diag
system check
2
1. Ignition “OFF”, with scan tool disconnect-
ed.
2. Disconnect the Relay solenoid switch
from the Relay box.
3. Apply a circuit tester with the voltage
range or a test light to the output circuit for
the Relay.
4. Ignition “ON”, Engine “OFF”.
Is voltage as prescribed, or is test Light lit until
18 seconds?
≥8V or light
“ON” (for 12
Volt)
≥16V or light
“ON” (for 24
Volt)
3
1. Ignition “OFF”
2. Disconnect the ECM connector from
ECM.
3. Check the short to voltage of Relay circuit
between the ECM and Relay connector.
4. Repair if necessary.
Has DTC 42 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”
Is DTC 42 all right under Scan Tool Check?
—
7
Is any current trouble other than DTC 42 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
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