Isuzu N-Series. Manual - part 460

6E-176 EMISSION AND ELECTRICAL DIAGNOSIS

DTC-22 Rack Sensor Circuit High Voltage

Location of Rack Sensor Connector

Legend

1. OSC (red)

3. GND (black)

2. MDL (white)

4. Rack sensor

N6A1319E

N6A1320E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-177

Connector Name of Rack Sensor

Notice:
Mark “___” on connector which is plugged, therefore,
should be confirmed to be played.

Relation Between Connector Number and Signal
Name

Connector 

No

Signal name

Wire color

1

Rack sensor (OSC)

R

2

Rack sensor (GND)

B

4

Rack sensor (MDL)

W

N6A1321E

6E-178 EMISSION AND ELECTRICAL DIAGNOSIS

Step

Action

Value

YES

NO

1

Was the “Diagnostic system check” per-
formed?

—

Go to Step 2

Go to diagnostic 

system check

2

Remove Sensor Connector.

Has DTC22 been corrected? (Ignore DTC 21)

—

Go to Step 3

Go to Step 7

3

1. Jumper Harness signal Terminal and

GND terminal at the Sensor side of Con-
nector.

2. Ignition “ON”

Has DTC22 been corrected?

—

Go to Step 4

Go to Step 5

4

1. Check the Sensor Connector for inter ter-

minal short.
After check, repair if necessary.

Was Connector Terminal shorted?

—

Go to Step 12

Go to Step 6

5

1. Check the GND Circuit for disconnect.

After check, repair if necessary.

Is GND circuit disconnect?

—

Go to Step 12

Go to Step 11

6

1. Check the Sensor Harness signal circuit

and power source circuit for short.
After check, repair if necessary.

Was Harness shorted?

—

Go to Step 12

Go to Step 8

7

1. Check the Harness signal circuit and pow-

er source for short.
After check, repair if necessary.

Was Harness shorted?

—

Go to Step 12

Go to Step 11

8

1. Apply 5V to RACK+ TERMINAL.
2. Measure RACK SIG Voltage.

Is RACK SIG VOLTAGE as specified?

0.9 — 2.0V

(Idling speed)

Go to Step 9

Go to Step 10

9

1. Check the iron core of RACK Sensor for

damage, seizure, and wear.

2. After check, repair if necessary.

Was there any trouble in the iron core(RACK
end) inside RACK Sensor?

—

Go to Step 12

Go to Step 11

10

Replace the RACK Sensor.

Is the action complete?

—

Go to Step 12

—

11

Replace the ECM.

Is the action complete?

—

Go to Step 12

—

12

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

Is DTC22 all right under Scan Tool Check?

—

Go to Step 13

Go to Step 2

13

Is any current trouble other than DTC 22 dis-
played by indicator light?

—

Go to trouble code 

section

Trouble code clear

EMISSION AND ELECTRICAL DIAGNOSIS 6E-179

DTC-31 Exhaust Gas Recirculation (EGR) Vacuum Switching Valve (VSV) Solenoid Control
Low Voltage

N6A1325E