Isuzu N-Series. Manual — part 461
6E-180 EMISSION AND ELECTRICAL DIAGNOSIS
Appearance of Vacuum Switching Valve (VSV):
Exhaust Gas Recirculation (EGR) Connector
VSV: EGR
VSV: EGR Connector
Measure Resistance at VSV: EGR
Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.
Legend
1. 2 pin
2. Port
N6A1264E
Connector No
Signal
1
GND
2
SIG
N6A1327E
Legend
1. Circuit tester
3. Measure resistance between connector pin
2. Remove VSV wire harness
N6A1328E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-181
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 “Diagnostic system check” per-
formed?
—
Go to diagnostic
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 “Power supply side ter-
minal” of the VSV harness 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 31 been corrected?
—
—
4
Using the DVM, check the resistance of the
VSV.
Does the DVM read the following Value?
37 — 44
Ω
159 — 169
Ω
5
1. Ignition “OFF”
2. Disconnect the ECM connector from
ECM.
3. Check the VSV circuit between the ECU
and VSV connector.
• A short to ground
• An open circuit
4. Repair if necessary.
Has DTC 31 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”.
Does DTC 31 come normal condition?
—
6E-182 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-32 Exhaust Gas Recirculation (EGR) Vacuum Switching Valve (VSV) Solenoid Control
High Voltage
9
Is any current trouble other than DTC 31 dis-
played by indicator light?
—
Go to trouble code
section
Trouble code clear
Step
Action
Value
YES
NO
N6A1329E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-183
Appearance of Vacuum Switching Valve (VSV):
Exhaust Gas Recirculation (EGR) Connector
VSV: EGR
VSV: EGR Connector
Measure Resistance at VSV: EGR
Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.
Legend
1. 2 pin
2. Port
N6A1264E
Connector No
Signal
1
GND
2
SIG
N6A1327E
Legend
1. Circuit tester
3. Measure resistance between connector pin
2. Remove VSV wire harness
N6A1328E
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