Isuzu N-Series. Service manual — part 443
6E-108 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-P45 Engine Speed Sensor Circuit Low Voltage
N6A1228E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-109
Appearance of Engine Speed Sensor and Con-
nector Name
Engine Speed Sensor
Engine Speed Sensor Connector
Measure Resistance at Engine Speed Sensor
Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.
Legend
1. To engine speed sensor
2. 2 pin
N6A1229E
Legend
1. To engine speed sensor
2. 2 pin
Connector No
Signal
1
GND
2
SIG
N6A1230E
Legend
1. Circuit tester
3. Engine speed sensor
2. Remove engine wire harness
4. Measure resistance between connector pin
N6A1231E
6E-110 EMISSION AND ELECTRICAL DIAGNOSIS
Resistance value
Notice:
Resistance value is difference according to the engine temperature (condition of engine warming up).
Location of Fuse
Inspection Point
Resistance Value
(k
Ω)
Reference
Connector
Pin No.
2 pin Black
2
←→ 1
840
±20%
SIG
←→ GND
2
←→ Body
∞
SIG
←→ Body
Legend
1. Fuse puller
3. Label
2. Spare fuses
4. Fuses (F-1 — F-24)
N6A1232E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-111
Step
Action
Value
YES
NO
1
1. Ignition “ON”, Engine “OFF”
2. Connect a voltmeter to the ECM connec-
tor terminals (ENGINE+) and (ENGINE-)
Is the voltage 0V?
—
2
1. Ignition “ON”, Engine “ON”
2. Connect a voltmeter to the ECM connec-
tor terminals (ENGINE+) and (ENGINE-).
Is the voltage under the range of 0 — 1V (AC
intermittently) when the engine speed is about
2000RPM? Does the Voltage increase as the
engine speed is increased?
—
3
Check for poor sensor ground or sensor signal
circuit terminal connection and terminal
shorted at the ECM and replace terminal(s) if
necessary.
Did any of the terminals need to be replaced?
—
4
1. Check sensor signal circuit for disconnec-
tion and power source for short.
2. Check sensor GND circuit for disconnec-
tion and power source for short.
3. Repair if necessary.
Was repair needed?
—
5
1. Check signal circuit for GND short.
2. Repair if necessary.
Was repair needed?
—
6
Replace the sensor.
Is the action complete?
—
—
7
Replace the ECM.
Is the action complete?
—
—
8
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”
3. Connect the Scan Tool.
4. Ignition “ON” Engine “OFF”
5. Make Scan Tool indicate engine speed.
Is a speed range of 700 rpm to 900 rpm indi-
cated with the engine idling (accel. off)?
And as engine speed rises with accel. on,
does the indicated value rise?
—
9
Is any current trouble other than DTC 45 dis-
played by scan tool?
—
Go to trouble code
section
Trouble code clear
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