Isuzu N-Series. Manual — part 706
6E-246 Engine Control System (4HK1)
10
1.
Turn OFF the ignition.
2.
Disconnect the ECM harness connector.
3.
Inspect for an intermittent and for a poor
connection on the APP sensor 1 circuit at the
harness connector of the ECM (pin 41 of J-
191 connector).
4.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 13
Go to Step 12
11
Replace the APP sensor. Refer to Accelerator
Pedal Position (APP) Sensor Replacement in this
section. (APP sensor 1 is internal to APP sensor
assembly)
Did you complete the replacement?
—
Go to Step 13
—
12
Important:
Replacement ECM must be programmed.
Replace the ECM. Refer to Engine Control Module
(ECM) Replacement / Fuel Injector ID Code Data
Programming in this section.
Did you complete the replacement?
—
Go to Step 13
—
13
1.
Reconnect all previously disconnected
harness connector(s).
2.
Clear the DTCs with the Tech 2.
3.
Turn OFF the ignition for 30 seconds.
4.
Start the engine.
5.
Fully depress and release the accelerator
pedal while observing the APP Sensor 1
parameter with the Tech 2.
Does the APP Sensor 1 parameter ever exceed the
specified value?
4.8 volts
Go to Step 3
Go to Step 14
14
Observe the DTC Information with the Tech 2.
Are there any DTCs that you have not diagnosed?
—
Go to Diagnostic
Trouble Code (DTC)
List
System OK
Step
Action
Value(s)
Yes
No
Engine Control System (4HK1) 6E-247
P1282 (Flash Code 24)
Circuit Description
The accelerator pedal position (APP) sensor is
mounted on the accelerator pedal control assembly.
The sensor is made up of two individual sensors within
one housing. The engine control module (ECM) uses
the APP sensors to determine the amount of
acceleration or deceleration desired by the person
driving the vehicle via the fuel injector control. The APP
sensor 2 has the following circuits.
• 5 volts reference circuit
• Low reference circuit
• APP sensor 2 signal circuit
The ECM supplies 5 volts to the APP sensor 2 on the 5
volts reference circuit. The ECM also provides a ground
on the low reference circuit. The APP sensor 2
provides a signal to the ECM on the APP sensor 2
signal circuit, which is relative to the position changes
of the accelerator pedal angle. The ECM monitors the
APP sensor 2 signal for voltages outside the normal
range of the APP sensor 2. If the ECM detects an
excessively low APP sensor 2 signal voltage, this DTC
will set.
Condition for Running the DTC
• DTCs P1630 and P1632 are not set.
• The ignition switch is ON.
• The ignition voltage is more than 18 volts.
Condition for Setting the DTC
• The ECM detects that the APP sensor 2 signal
voltage is less than 0.2 volts.
Action Taken When the DTC Sets
• The ECM illuminates the malfunction indicator
lamp (MIL) when the diagnostic runs and fails.
• The ECM blinks the exhaust brake indicator lamp
when the diagnostic runs and fails.
• The ECM inhibits exhaust brake control.
Condition for Clearing the MIL / DTC
• The ECM turns OFF the MIL and exhaust brake
indicator lamp when the key is cycled after a
current DTC clears.
• A current DTC clears when the diagnostic runs and
does not fail at next driving cycle.
• A history DTC clears after 20 consecutive driving
cycles without a fault. Or clear with the Tech 2 or
accelerator pedal operation.
Diagnostic Aid
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
• APP sensor 2 may have an intermittent open
somewhere in the pedal range.
DTC P1282 (Flash Code 24)
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls
Connector End Views or Engine Control Module (ECM)
Connector End Views
Step
Action
Value(s)
Yes
No
1
Did you perform the Diagnostic System Check –
Engine Controls?
—
Go to Step 2
Go to Diagnostic
System Check –
Engine Controls
2
1.
Install the Tech 2.
2.
Turn OFF the ignition for 30 seconds.
3.
Start the engine.
4.
Monitor the Diagnostic Trouble Code (DTC)
Information with the Tech 2.
Is DTC P1632 also set?
—
Go to DTC P1632
Go to Step 3
3
1.
Turn ON the ignition, with the engine OFF.
2.
Observe the Accelerator Pedal Position (APP)
Sensor 2 parameter with the Tech 2.
Is the APP Sensor 2 parameter less than the
specified value?
0.2 volts
Go to Step 4
Go to Diagnostic
Aids
6E-248 Engine Control System (4HK1)
4
1.
Turn OFF the ignition.
2.
Disconnect the APP sensor harness
connector.
3.
Connect a DMM between the 5 volts reference
circuit of the APP sensor 2 harness (pin 1 of
B-280 connector) and a known good ground.
4.
Turn ON the ignition, with the engine OFF.
Is the DMM voltage more than the specified value?
4.5 volts
Go to Step 5
Go to Step 6
5
1.
Turn OFF the ignition.
2.
Connect a 3-amp fused jumper wire between
the 5 volts reference circuit and the signal
circuit of the APP sensor 2 harness (pins 1
and 2 of B-280 connector).
3.
Turn ON the ignition, with the engine OFF.
4.
Observe the APP Sensor 2 parameter with the
Tech 2.
Is the APP Sensor 2 parameter more than specified
value?
4.5 volts
Go to Step 8
Go to Step 7
6
1.
Test the 5 volts reference circuit between the
engine control module (ECM) (pin 61 of J-191
connector) and the APP sensor 2 (pin 1 of B-
280 connector) for an open circuit or high
resistance.
2.
Repair the circuit(s) as necessary.
Did you find and correct the condition?
—
Go to Step 12
Go to Step 9
7
1.
Test the signal circuit between the ECM (pin
64 of J-191 connector) and the APP sensor 2
(pin 2 of B-280 connector) 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 12
Go to Step 9
8
1.
Turn OFF the ignition.
2.
Inspect for an intermittent and for poor
connections at the harness connector of the
APP sensor (pins 1 and 2 of B-280
connector).
3.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 12
Go to Step 10
9
1.
Turn OFF the ignition.
2.
Disconnect the ECM harness connector.
3.
Inspect for an intermittent and for poor
connections on the APP sensor 1 circuits at
the harness connector of the ECM (pins 61
and 64 of J-191 connector).
4.
Repair the connection(s) as necessary.
Did you find and correct the condition?
—
Go to Step 12
Go to Step 11
Step
Action
Value(s)
Yes
No
Engine Control System (4HK1) 6E-249
10
Replace the APP sensor. Refer to Accelerator
Pedal Position (APP) Sensor Replacement in this
section. (APP sensor 2 is internal to APP sensor
assembly)
Did you complete the replacement?
—
Go to Step 12
—
11
Important:
Replacement ECM must be programmed.
Replace the ECM. Refer to Engine Control Module
(ECM) Replacement / Fuel Injector ID Code Data
Programming in this section.
Did you complete the replacement?
—
Go to Step 12
—
12
1.
Reconnect all previously disconnected
harness connector(s).
2.
Clear the DTCs with the Tech 2.
3.
Turn OFF the ignition for 30 seconds.
4.
Start the engine.
5.
Fully depress and release the accelerator
pedal while observing the APP Sensor 2
parameter with the Tech 2.
Is the APP Sensor 2 parameter less than the
specified value?
0.2 volts
Go to Step 3
Go to Step 13
13
Observe the DTC Information with the Tech 2.
Are there any DTCs that you have not diagnosed?
—
Go to Diagnostic
Trouble Code (DTC)
List
System OK
Step
Action
Value(s)
Yes
No
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