Isuzu N-Series. Manual — part 430
6E-56 EMISSION AND ELECTRICAL DIAGNOSIS
Step
Action
Value
YES
NO
1
Was the on-board diagnostic (OBD) system
check performed?
—
Go to self diag
system check
2
1. Check harness side power source circuit
and signal circuit for GND short.
2. Repair if necessary.
Has DTC21 been corrected?
—
3
Disconnect the Sensor Connector.
Jumper RACK+ and RACK signal.
Free from trouble now?
Ignore code 22.
—
4
1. Apply 5V to RACK+ TERMINAL.
Measure RACK SIG Voltage.
Is RACK SIG VOLTAGE as specified?
0.9 — 2.0V
(Idling speed)
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?
—
6
1. Check harness signal circuit and power
source circuit for disconnect.
2. Repair if necessary.
Free from trouble now?
—
7
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?
—
8
1. Replace the RACK Sensor.
Is the action complete?
—
—
9
1. Replace the ECM.
Is the action complete?
—
—
10
1. Reconnect all the connectors removed.
2. Ignition -ON+, Engine “OFF”
Is DTC 21 all right under Scan Tool Check?
—
11
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
No
Signal
Wire color
1
Rack sensor (OSC)
R
2
Rack sensor (MDL)
W
3
Rack sensor (GND)
B
EMISSION AND ELECTRICAL DIAGNOSIS 6E-59
Step
Action
Value
YES
NO
1
Was the “on-board diagnostic (OBD) system
check” performed?
—
Go to self diag
system check
2
Remove Sensor Connector.
Has DTC22 been corrected? (Ignore DTC21)
—
3
1. Jump between Harness signal Terminal
and GND terminal at the Sensor side of
Connector.
2. Ignition “ON”
Has DTC22 been corrected?
—
4
1. Check the Sensor Connector for inter ter-
minal short.
After check, repair if necessary.
Was Connector Terminal shorted?
—
5
1. Check GND Circuit for disconnect.
After check, repair if necessary.
Is GND circuit disconnect?
—
6
1. Check Sensor Harness signal circuit and
power source circuit for short.
After check, repair if necessary.
Was Harness shorted?
—
7
1. Check Harness signal circuit and power
source for short.
After check, repair if necessary.
Was Harness shorted?
—
8
1. Apply 5V to RACK+ TERMINAL.
2. Measure RACK SIG Voltage.
Is RACK SIG VOLTAGE as specified?
0.9 — 2.0V
(Idling speed)
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?
—
10
Replace the RACK Sensor.
Is the action complete?
—
—
11
Replace the ECM.
Is the action complete?
—
—
12
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”
Is DTC22 all right under Scan Tool Check?
—
13
Is any current trouble other than DTC 22 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
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