Isuzu 2008MY N Series User Manual

Engine Control System (4HK1) 1A-159
5
Connect a DMM between the signal circuit (pin 1 of
E-18) and a known good ground.
Is the DMM voltage more than the specified
value?
5.5 volts
Go to Step 12 Go to Step 6
6
Is the DMM voltage more than the specified
value at Step 5?
4.5 volts
Go to Step 7 Go to Step 11
7
1. Connect a test lamp between the signal circuit
(pin 1 of E-18) and a known good ground.
2. Connect a DMM between the probe of the test
lamp and a known good ground.
Is the DMM voltage more than the specified
value?
4.5 volts
Go to Step 13 Go to Step 8
8
Connect a DMM between the 5 volts reference
circuit and low reference circuit (pins 2 and 3 of E-
18).
Is the DMM voltage more than the specified
value?
4.5 volts
Go to Step 14 Go to Step 10
9
Notice: The CMP sensor shares the 5 volts
reference circuit with other sensors. A fault
condition in the 5 volts reference circuit may set
DTCs on sensors that share this circuit.
1. Test the 5 volts reference circuit between the
ECM (pin 87 of E-12) and the CMP sensor
(pin 3 of E-18) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 19 Go to Step 15
10
Notice: The CMP sensor shares the low reference
circuit with other sensors. A fault condition in the
low reference circuit may set DTCs on sensors that
share this circuit.
1. Test the low reference circuit between the
ECM (pin 101 of E-12) and the CMP sensor
(pin 2 of E-18) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 19 Go to Step 15
11
1. Test the signal circuit between the ECM (pin
98 of E-12) and the CKP sensor (pin 1 of E-
18) for the following conditions:
• An open circuit
• A short to ground
• A short to the low reference circuit
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 19 Go to Step 15
Step Action Value(s) Yes No
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Isuzu 2008MY N Series Specifications

General

Brand	Isuzu
Model	2008MY N Series
Category	Control Systems
Language	English