Isuzu 2000 Trooper Workshop Manual page 1121

6E–252
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0204 – Injector 4 Control Circuit (Cont'd)
Step
5 1. Engine "OFF."
2. Disconnect the injector test connector.
3. Install an injector test light J-39021-65 on injector
connector.
4. Crank the engine and note the light.
Does the cylinder 4 test light blink?
6 Note whether the injector test light for cylinder 4 was
"OFF" or "ON" steady in step 5.
Was the test light "ON" steady while cranking the
engine?
7 1. Disconnect the PCM connector for the affected
injectors.
2. With a test light connected to B+, probe the affected
injector driver circuit.
Does the test light illuminate?
8 Repair short to ground in the injector driver circuit.
Is the action complete?
9 1. Disconnect the injector test connector.
2. At the injector side of the harness, connect an
ohmmeter between the positive wire (red with blue
tracer) and the wire for cylinder 4 (green/red).
Does the ohmmeter indicate continuity?
10 Repair the open injector harness wire or open injector.
Is the action complete?
11 At the PCM side of the injector test connector, check
the green/red wire for a short to voltage.
Was there a short to voltage?
12 Repair the short to voltage.
Is the action complete?
13 Check for an open circuit between the injector test
connector and the PCM.
Was there an open circuit?
14 Repair the open circuit.
Is the action complete?
15 Replace the PCM.
IMPORTANT: The
programmed.
Powertrain Control
procedures.
And also refer to the latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
Action
replacement PCM
Refer to On-Vehicle Service in
Module and Sensors
Value(s)
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must be
for
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Yes No
Go to Fuel
Injector Coil
Test
Procedure Go to Step 6
Go to Step 7 Go to Step 9
Go to Step 8 Go to Step 15
Go to OBD
System
Check —
Go to Step 11 Go to Step 10
Verify repair —
Go to Step 12 Go to Step 13
Verify repair —
Go to Step 14 Go to Step 15
Verify repair —
Verify repair —