Isuzu 2008MY N Series Workshop Manual page 268

Step
Connect a test lamp between the low reference
circuit (pin 3 of B-5) and battery voltage.
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Does the test lamp illuminate?
Important: The APP sensor 2 may be damaged if
the sensor signal circuit is shorted to a voltage
source.
1. Test the signal circuit between the ECM (pin
64 of J-14) and the APP sensor (pin 2 of B-5)
for the following conditions:
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• A short to battery or ignition voltage
• A short to any 5 volts reference
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
Notice: The APP sensor 2 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
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ECM (pin 60 of J-14) and the APP sensor (pin
3 of B-5) for an open circuit or high resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Inspect for an intermittent and for a poor
connection at the harness connector of the
APP sensor (pin 3 of B-5).
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2. Repair the connection(s) as necessary.
Did you find and correct the condition?
1. Turn OFF the ignition.
2. Disconnect the ECM harness connector.
3. Inspect for an intermittent and for a poor
connection at the harness connector of the
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ECM (pin 60 of J-14).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
Replace the APP sensor. Refer to Accelerator
Pedal Sensor in Section 1I Engine Speed Control
11
System.
Did you complete the replacement?
Important: Replacement
programmed and learned.
12
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
Action
ECM must
Engine Control System (4HK1)
Value(s)
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be
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Yes
Go to Step 9 Go to Step 8
Go to Step 13 Go to Step 12
Go to Step 13 Go to Step 10
Go to Step 13 Go to Step 11
Go to Step 13 Go to Step 12
Go to Step 13
Go to Step 13
1A-265
No
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