Isuzu N-Series. Service manual — part 438
6E-88 EMISSION AND ELECTRICAL DIAGNOSIS
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 VSV from the wiring har-
ness connector.
3. Ignition “ON” Engine “OFF”
4. Using the Digital Voltmeter (DVM), check
for voltage on the “IC25” of the VSV har-
ness connector.
Does the DVM read the following value?
12 Volt or 24
Volt
3
1. Check the suspect circuit between the
VSV connector and “Engine Ignition.”
Fuse for the following condition.
• A short to ground
• An open circuit
2. Repair if necessary.
Has DTC 35 been corrected?
—
—
4
Using the DVM, check the resistance of the
VSV.
Does the DVM read the following Value?
37 — 44
Ω (for
12 Volt)
159 — 169
Ω
(for 24 Volt)
5
1. Ignition “OFF”
2. Disconnect the ECM connector from
ECM.
3. Check the VSV circuit between the ECM
and VSV connector.
• A short to ground
• An open circuit
4. Repair if necessary.
Has DTC 35 been corrected?
—
6
Replace the VSV.
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 35 all right under Scan Tool Check?
—
9
Is any current trouble other than DTC 35 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
EMISSION AND ELECTRICAL DIAGNOSIS 6E-89
DTC-P36 Exhaust Gas Recirculation (EGR) Quick Cut Vacuum Switching Valve (VSV) Con-
trol Circuit High Voltage
N6A1204E
6E-90 EMISSION AND ELECTRICAL DIAGNOSIS
Appearance of Vacuum Switching Valve (VSV):
Exhaust Gas Recirculation (EGR) CUT Sensor
and Connector Name
VSV: EGR CUT
VSV: EGR CUT Connector
Measure Resistance at VSV: EGR CUT
Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.
N6A1205E
Legend
1. To VSV: EGR
2. 2 pin
Connector No
Signal
1
SIG
2
GND
N6A1190E
Legend
1. Circuit tester
3. Measure resistance between connector pin
2. Remove VSV wire harness
N6A1207E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-91
Resistance value
Notice:
Resistance value is difference according to the engine temperature (condition of engine warming up).
Inspection Point
Resistance Value
(k
Ω)
Reference
Connector
Pin No.
2 pin Black
2
←→ 1
37 to 44 (for 12 volt)
159 to 169 (for 24 volt)
SIG
←→ GND
1
←→ Body
∞
SIG
←→ Body
Step
Action
Value
YES
NO
1
Was the “on-board diagnostic (OBD) system
check” performed?
—
Go to self diag
system check
2
Using the DVM, check the resistance of the
VSV.
Does the DVM read the following Value?
37 — 44
Ω
(for 12 Volt)
159 — 169
Ω
(for 24 Volt)
3
1. Ignition “OFF”
2. Disconnect the ECM connector from
ECM.
3. Check the short to voltage of VSV circuit
between the ECM and VSV connector.
4. Repair if necessary.
Has DTC 36 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 36 all right under Scan Tool Check?
—
7
Is any current trouble other than DTC 36 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
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