Isuzu N-Series. Service manual - part 430

Go to self diag

system check

1. Check harness side power source circuit

and signal circuit for GND short.

2. Repair if necessary.

Has DTC21 been corrected?

—

Go to Step 3

Disconnect the Sensor Connector.
Jumper RACK+ and RACK signal.

Free from trouble now?
Ignore code 22.

—

Go to Step 4

Go to Step 6

1. Apply 5V to RACK+ TERMINAL.

Measure RACK SIG Voltage.

Is RACK SIG VOLTAGE as specified?

0.9 — 2.0V

(Idling speed)

Go to Step 7

Go to Step 5

1. Check Rack Sensor Harness Signal Cir-

cuit and power source for GND short.
Check signal circuit for disconnect.

2. Repair if necessary.

Free from trouble now?

—

Go to Step 7

1. Check harness signal circuit and power

source circuit for disconnect.

2. Repair if necessary.

Free from trouble now?

—

Go to Step 8

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 9

1. Replace the RACK Sensor.

Is the action complete?

—

—

1. Replace the ECM.

Is the action complete?

—

—

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

Is DTC 21 all right under Scan Tool Check?

—

Is any current trouble other than DTC 21 dis-
played by scan tool?

—

Go to trouble code

section

Trouble code clear

EMISSION AND ELECTRICAL DIAGNOSIS 6E-57

DTC-P22 Rack Sensor Circuit High Voltage

N6A1167E

6E-58 EMISSION AND ELECTRICAL DIAGNOSIS

Location of Rack Sensor Connector

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

Legend

1. OSC (red)

3. GND (black)

2. MDL (white)

4. Rack sensor

N6A1168E

Legend

1. Rack sensor connector
2. Natural 3 pin

N6A1169E

Connector

Signal

Wire color

Rack sensor (OSC)

Rack sensor (MDL)

Rack sensor (GND)

EMISSION AND ELECTRICAL DIAGNOSIS 6E-59

Step

Action

Value

YES

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

—

Go to self diag

system check

Remove Sensor Connector.

Has DTC22 been corrected? (Ignore DTC21)

—

Go to Step 3

Go to Step 7

1. Jump between Harness signal Terminal

and GND terminal at the Sensor side of
Connector.

2. Ignition “ON”

Has DTC22 been corrected?

—

Go to Step 4

Go to Step 5

1. Check the Sensor Connector for inter ter-

minal short.
After check, repair if necessary.

Was Connector Terminal shorted?

—

Go to Step 6

1. Check GND Circuit for disconnect.

After check, repair if necessary.

Is GND circuit disconnect?

—

Go to Step 11

1. Check Sensor Harness signal circuit and

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

Was Harness shorted?

—

Go to Step 8

1. Check Harness signal circuit and power

source for short.
After check, repair if necessary.

Was Harness shorted?

—

Go to Step 11

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

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 11

Replace the RACK Sensor.

Is the action complete?

—

—

Replace the ECM.

Is the action complete?

—

—

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

Is DTC22 all right under Scan Tool Check?

—

Go to Step 13