Isuzu N-Series. Service manual — part 432
6E-64 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-P24 Solenoid Switch Control Circuit High Voltage
N6A1173E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-65
Location of Relay
Inspection for Timing Advance Solenoid Switch cut
relay
Legend
1. Relay box (Installed on the instrument panel)
N6A1174E
NO
RELAY NAME
X-5
ABS IND.
X-6
Dimmer
X-7
Power window
X-8
Exh. brake
X-9
Cornering lamp
X-10
Thermo A/C
X-11
Exh. Brake, Charge warning, Key ON
X-12
Heater & A/C
X-13
Buzzer cancel, Heater
X-14
ECU, PTO main, Timing
X-15
Tail, PTO solenoid, M/T
X-16
PTO cut
Legend
A. Timing advance solenoid
N6A1175E
6E-66 EMISSION AND ELECTRICAL DIAGNOSIS
Resistance value
N6A1176E
N6A1177E
Inspection Point
Resistance
Reference
Inspection
relay unit
2
←→ 4
240 to 290 (
Ω) (for 12 volt)
256 to 276 (
Ω) (for 24 volt)
1
←→ 5
∞
Not be supplied electricity
Below 0.5 (
Ω)
Be supplied electricity
3
←→ 5
Below 0.5 (
Ω)
Be supplied electricity
∞
Not be supplied electricity
EMISSION AND ELECTRICAL DIAGNOSIS 6E-67
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. Check if there is no short between Relay
Box Terminals.
3. Repair if necessary.
Was the circuit shorted between Relay Box
Terminals?
—
4
1. Disconnect the ECM.
2. Check if Relay Sig Circuit for a short to
Chassis/GND or short to voltage.
3. Repair if necessary.
Was Relay signal circuit shorted?
—
5
1. Disconnect the Relay.
2. Measure the resistance between the coil
circuit terminal of the Relay.
Is the resistance with in specific valve?
240 — 290
Ω
(for 12 Volt)
256 — 276
Ω
(for 24 Volt)
6
1. Ignition “OFF”.
2. Replace the Relay.
Is the action complete?
—
—
7
1. Ignition “ON”.
2. Replace the ECM.
Is the action complete?
—
—
8
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine OFF, and Ignition
off after 30sec.
3. Install Scan tool.
4. Ignition “ON”, Engine “OFF”.
Is DTC 24 all right under Scan Tool Check?
—
9
Is any current trouble other than DTC 24 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
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