Isuzu N-Series. Manual - part 436

6E-80 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-81

Step

Action

Value

YES

NO

1

Was the “on-board diagnostic (OBD) system
check” performed?

—

Go to Step 2

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 “IC27” of the VSV har-
ness connector.

Does the DVM read the following value?

12 Volt or 24 

Volt

Go to Step 4

Go to Step 3

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 33 been corrected?

—

Go to Step 8

—

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)

Go to Step 5

Go to Step 6

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 33 been corrected?

—

Go to Step 8

Go to Step 7

6

Replace the VSV.

Is the action complete?

—

Go to Step 8

—

7

Replace the ECM.

Is the action complete?

—

Go to Step 8

—

8

1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”

Is DTC 33 all right under Scan Tool Check?

—

Go to Step 9

Go to Step 2

9

Is any current trouble other than DTC 33 dis-
played by scan tool?

—

Go to trouble code 

section

Trouble code clear

6E-82 EMISSION AND ELECTRICAL DIAGNOSIS

DTC-P34 Variable Swirl System (VSS) Control Circuit High Voltage

N6A1196E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-83

Appearance of VSV for VSS and Connector
Name

VSV for VSS

VSV Connector

Measure Resistance at VSV for VSS

Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.

N6A1189E

Legend

1. 2 pin

Connector No

Signal

1

SIG

2

GND

N6A1198E

Legend

1. Circuit tester

3. Measure resistance between connector pin

2. Remove VSV wire harness

N6A1191E