Isuzu 4JA1 Workshop Manual page 367

Step
4 1. Observe the Engine Speed parameter with the
scan tool.
2. Accelerate the engine between idle and W.O.T.
(accelerator pedal full travel) many times while
observing the scan tool.
Does the Engine Speed parameter indicate correct
engine speed?
5 1. Inspect the crankshaft position (CKP) sensor for
tightness.
2. Remove the CKP sensor and check for damage,
metal particles on magnet and for flywheel
circumference damage.
Did you find and correct the condition?
6 1. Turn OFF the ignition.
2. Disconnect the CKP sensor harness connector.
3. Inspect for an intermittent, for poor connections
and corrosion on the CKP sensor terminal (pins
1, 2 and 3 of E-9 connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition.
7 1. Turn OFF the ignition.
2. Disconnect the fuel injection pump control unit
(PCU) harness connector.
3. Inspect for an intermittent, for a poor connection
and corrosion on the CKP sensor signal input at
the harness connector of the PCU (pin 8 of E-6
connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
8 1. Turn OFF the ignition.
2. Disconnect
(ECM) harness connector.
3. Inspect for an intermittent, for poor connections
and corrosion on at the harness connector of the
ECM (pins 12, 13, 22 and 25 of C-57 connector).
4. Repair the connection(s) as necessary.
Did you find and correct the condition?
9 Important: The fuel injection pump must be timed to
the engine.
Replace the fuel injection pump. Refer to Fuel
Injection Pump Replacement in engine mechanical
section.
Did you complete the replacement?
10 1. Reconnect all previously disconnected harness
connector(s).
2. Clear the DTCs with the scan tool.
3. Turn OFF the ignition for 30 seconds.
4. Start the engine.
5. Accelerate the engine between idle and W.O.T.
(accelerator pedal full travel) many times while
observing the DTC Information with the scan
tool.
Does the DTC fail this ignition?
11 Observe the DTC Information with the scan tool.
Are there any DTCs that you have not diagnosed?
Action
the engine control module
Engine Control System (4JH1) 6E-113
Value(s) Yes

Go to Step 9

Go to Step 10

Go to Step 10

Go to Step 10

Go to Step 10

Go to Step 10

Go to Step 2
Go to Diagnostic

Trouble Code (DTC)
List
No
Go to Step 5
Go to Step 6
Go to Step 7
Go to Step 8
Go to Step 9

Go to Step 11
System OK