Isuzu N-Series. Service manual — part 431
6E-60 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-P23 Solenoid Switch Control Circuit Low Voltage
N6A1173E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-61
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-62 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
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”, Engine “ON”.
2. Jumper the magnetic switch Relay ground
circuit at the Relay connector to chassis
ground.
3. Observe the “Relay; solenoid switch” cir-
cuit open status on the scan tool.
Has DTC23 been corrected?
—
3
1. Check for poor connector at the Relay
connector and replace the terminals if
necessary.
Did any terminals require replacement?
—
4
1. Check the Relay ground circuit for an
open.
2. If the Relay ground circuit is open, repair
it as necessary.
Was the Relay ground circuit open?
—
EMISSION AND ELECTRICAL DIAGNOSIS 6E-63
5
1. Ignition “OFF”, with scan tool disconnect-
ed.
2. Disconnect the Solenoid switch Relay
connector.
3. Apply a circuit tester with voltage range or
a test light to the output line for the Relay.
4. Ignition “ON”, Measure the voltage or
check the test light “ON”. Ignition “OFF”
≥8V or light
“ON” (for 12
Volt)
≥16V or light
“ON” (for 24
Volt)
6
1. Ignition “ON”.
2. Disconnect ECM, and check for the Relay
signal circuit terminal connector at the
ECM and clean or replace terminal if nec-
essary.
Did any terminals need to be repaired?
—
7
1. Check the Relay signal circuit for an open.
2. If the Relay signal circuit is open, repair it
as necessary.
Was the Relay signal circuit open?
—
8
1. Disconnect the Relay.
2. Measure the resistance between the coil
circuit terminals of the Relay.
Is the resistance within specific value?
240 — 290
Ω
(for 12 Volt)
256 — 276
Ω
(for 24 Volt)
9
1. Replace the Relay.
Is the action complete?
—
—
10
1. Replace the ECM
Is the action complete?
—
—
11
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”.
3. Ignition “OFF” after 30 seconds.
4. Install Scan tool.
Is DTC 23 all right under Scan Tool Check?
—
12
Is any current trouble other than DTC 23 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
Step
Action
Value
YES
NO
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