Isuzu 4JA1 Workshop Manual page 452

6E-198 Engine Control System (4JH1)
Step
5 Replace the neutral switch. Refer to Neutral Switch
Replacement in Transmission Section.
Did you complete the replacement?
6 Important: Replacement
programmed.
Replace the ECM. Refer to Engine Control Module
(ECM) Replacement in this section.
Did you complete the replacement?
7 1. Reconnect all previously disconnected harness
connector(s).
2. Clear the DTCs with the scan tool.
Important: Following conditions must be met two
consecutive driving cycles before clear with the scan
tool. (One driving cycle: Ignition switch ON > Engine
run > Vehicle run > Ignition switch OFF for 10
seconds)
•
The engine speed is higher than 1500 RPM
•
The vehicle speed is higher than 63 km/h
(39 MPH)
•
The clutch pedal is released
•
Other than neutral
3. Turn ON the ignition, with the engine OFF.
4. Observe the Neutral Switch parameter with the
scan tool while shift to neutral and other
positions.
Does the scan tool indicate ON when the position is
neutral and OFF when other than the neutral?
8 Observe the DTC Information with the scan tool.
Are there any DTCs that you have not diagnosed?
Chart for A/T
Step
1 Did you perform the Diagnostic System Check-
Engine Controls?
2 1. Install the scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition, with the engine OFF.
4. Select the "JR405E Automatic Transmission" in
the system selection menu.
5. Monitor the Read Diagnostic Trouble Code
(DTC) Info As Stored By ECU with the scan tool.
Does the transmission control module (TCM) DTC
P0705 set?
3 1. Install the scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Observe the Neutral Switch parameter with the
scan tool while shift to P or N and other
positions.
Does the scan tool indicate ON when the position is
P or N and OFF when other than the P or N?
Action
ECM must
Action
Value(s)

be



Trouble Code (DTC)
Value(s)


DTC in Automatic

Yes
Go to Step 7
Go to Step 7
Go to Step 8 Go to Step 3
Go to Diagnostic
List
Yes
Go to Diagnostic
System Check-
Go to Step 2 Engine Controls
Go to Applicable
Transmission
Section Go to Step 3
Go to Diagnostic
Aids Go to Step 4
No


System OK
No