Isuzu N-Series. Manual — part 441
6E-100 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-P43 Aneroid Compensator Vacuum Switching Valve (VSV) Control Circuit Low Volt-
age
N6A1220E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-101
Appearance of Vacuum Switching Valve (VSV):
Aneroid 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-102 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 Gray
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-103
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 “IC26” 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 43 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 43 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 43 all right under Scan Tool Check?
—
9
Is any current trouble other than DTC 43 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
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