Isuzu N-Series. Service manual — part 463
6E-188 EMISSION AND ELECTRICAL DIAGNOSIS
Step
Action
Value
YES
NO
1
Was the “Diagnostic system check” per-
formed?
—
Go to diagnostic
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 “Power supply side ter-
minal” terminal of the Relay Box Connec-
tor.
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 Relay 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”
Does DTC 41 come normal condition?
—
9
Is any current trouble other than DTC 41 dis-
played by indicator light?
—
Go to trouble code
section
Trouble code clear
EMISSION AND ELECTRICAL DIAGNOSIS 6E-189
DTC-42 Quick On Start (QOS) Relay Control Circuit High Voltage
N6A1337E
6E-190 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-191
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
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