Isuzu N-Series. Manual — part 434
6E-72 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-P31 Exhaust Gas Recirculation (EGR) Electronic Vacuum Regulating Valve (EVRV)
Solenoid Control Low Voltage
N6A1188E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-73
Appearance of Electronic Vacuum Regulating
Valve (EVRV): Exhaust Gas Recirculation
(EGR) Sensor and Connector Name
EVRV: EGR
EVRV: EGR Connector
Measure Resistance at EVRV: EGR
Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.
N6A1189E
Legend
1. To EVRV: EGR
2. 2 pin
Connector No
Signal
1
GND
2
SIG
N6A1190E
Legend
1. Circuit tester
3. Measure resistance between connector pin
2. Remove EVRV wire harness
N6A1191E
6E-74 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 Black
2
←→ 1
12
±1 (for 12 volt)
48
±2 (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
1. Ignition “OFF”
2. Disconnect the EVRV from the wiring har-
ness connector.
3. Check the EVRV signal circuit between
the EVRV connector and the ECM for the
following condition.
• A short to ground
• An open circuit
4. Repair if necessary.
Has DTC31 been corrected?
—
3
Using the DVM, check the resistance of the
EVRV.
Does the DVM read the following Value?
12
Ω (for 12
Volt)
48
Ω (for 24
Volt)
4
1. Ignition “OFF”
2. Check an open circuit of the EVRV
ground circuit between the ECM and
EVRV connector.
3. Repair if necessary.
Has DTC31 been corrected?
—
5
Replace the EVRV.
Is the action complete?
—
6
Replace the ECM.
Is the action complete?
—
—
7
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”
Is DTC31 all right under Scan Tool Check?
—
8
Is any current trouble other than DTC31 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
EMISSION AND ELECTRICAL DIAGNOSIS 6E-75
DTC-P32 Exhaust Gas Recirculation (EGR) Electronic Vacuum Regulating Valve (EVRV)
Solenoid Control High Voltage
N6A1188E
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