Isuzu N-Series. Service manual — part 439
6E-92 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-P41 Quick On Start (QOS) Relay Control Circuit Low Voltage
N6A1212E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-93
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-94 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-95
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”
2. Disconnect the Relay from the Relay box
connector.
3. Ignition “ON” Engine “OFF”
4. Using the Digital Voltmeter (DVM), check
for voltage on the “HBOL” terminal of the
Relay Box Connector.
Does the DVM read the following value?
12 Volt or 24
Volt
3
1. Check the suspect circuit between the
Relay connector.
Fuse for the following condition.
• A short to ground
• An open circuit
2. Repair if necessary.
Has DTC 41 been corrected?
—
4
Using the DVM, check the resistance of inter
“4” “5” Relay terminal.
Does the DVM read the following Value?
23
Ω (for 12
Volt)
100
Ω (for 24
Volt)
5
1. Ignition “OFF”
2. Disconnect the ECM connector from
ECM.
3. Check the VSV circuit between the ECU
and Relay connector.
• A short to ground
• An open circuit
4. Repair if necessary.
Has DTC 41 been corrected?
—
6
Replace the Relay.
Is the action complete?
—
—
7
Replace the ECM.
Is the action complete?
—
—
8
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”
Is DTC 41 all right under Scan Tool Check?
—
9
Is any current trouble other than DTC 41 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
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