Isuzu N-Series. Service manual — part 442
6E-104 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-P44 Aneroid Compensator Vacuum Switching Valve (VSV) Control Circuit High Volt-
age
N6A1220E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-105
Appearance of Vacuum Switching Valve (VSV):
Ameroid Compensator and Connector Name
VSV: Aneroid Compensator
VSV: Aneroid Compensator
Measure Resistance at VSV Aneroid Compensator
Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.
N6A1221E
Legend
1. 2 pin
Connector No
Signal
1
SIG
2
GND
N6A1222E
Legend
1. Circuit tester
3. Measure resistance between connector pin
2. Remove VSV wire harness
N6A1223E
6E-106 EMISSION AND ELECTRICAL DIAGNOSIS
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 Green
2
←→ 1
37 to 44 (for 12 volt)
159 to 169 (for 24 volt)
SIG
←→ GND
1
←→ Body
∞
SIG
←→ Body
EMISSION AND ELECTRICAL DIAGNOSIS 6E-107
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.
5. Clear trouble code by Scan Tool.
6. Ignition “ON” Engine “ON”.
Does the MIL blink?
—
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”.
Clear trouble code by Scan Tool.
3. Ignition “ON” Engine “ON”.
Does the MIL blink?
—
7
Connect Scan Tool.
Is any current trouble other than DTC 44 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
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