Isuzu 2008MY N Series Workshop Manual page 123

1A-120 Engine Control System (4HK1)
Step
Connect a 3-amp fused jumper wire between the 5
volts reference circuit and the signal circuit (pins 5
and 6 of E-16).
5
Is the Intake
parameter more than the specified value?
Notice: The intake throttle position 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
6
ECM (pin 95 of E-12) and the intake throttle
valve (pin 5 of E-16) for an open circuit or high
resistance.
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Test the signal circuit between the ECM (pin
85 of E-12) and intake throttle valve (pin 6 of
E-16) for the following conditions:
• An open circuit
• A short to ground
7
• A short to the low reference circuit
• High resistance
2. Repair the circuit(s) as necessary.
Did you find and correct the condition?
1. Inspect for an intermittent and for poor
connections at the harness connector of the
intake throttle valve (pins 5 and 6 of E-16).
8
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
9
ECM (pins 85 and 95 of E-12).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
Replace the intake throttle valve. Refer to Intake
Throttle Valve in Section 1B Engine Mechanical.
10
Did you complete the replacement?
Important:
programmed and learned.
11
Replace the ECM. Refer to ECM Replacement.
Did you complete the replacement?
Action
Throttle Position
Replacement ECM
Value(s)
4.5 volts
Sensor
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must be
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Yes
Go to Step 8 Go to Step 7
Go to Step 12 Go to Step 9
Go to Step 12 Go to Step 9
Go to Step 12 Go to Step 10
Go to Step 12 Go to Step 11
Go to Step 12
Go to Step 12
No
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