Cylinder 4 - Isuzu 1999 RODEO Workshop Manual

6E1–186 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
3. This step determines if Diagnostic Trouble Code
P0203 is the result of a hard failure or an
intermittent condition.
5. This step tests the harness wiring and PCM control
of the injectors using a test light.
The fuel injector test connector is a gray 5 pin
connector at the right rear of the valve cover. It
can be identified by a blue connector lock which is
tethered to the harness.
J 39021–45 is a test light with one light for each
cylinder. The test light fits on the injector test
connector.
If the test light is ON steady before cranking the
engine as well as while cranking the engine, then
the injector driver circuit is shorted to voltage.
If the test light blinks, the PCM and the wiring to
the injectors are OK. Fuel Injector Coil Test
Procedure will check if the injectors are faulty.
7. Because the test light was ON steady, voltage to the
injector is OK, but the driver circuit is grounded at all
times. This step determines if the circuit is shorted
to ground or the PCM is faulty.
DTC P0203 – Injector Circuit Malfunction – Cylinder 3
Step
1 Was the "On–Board Diagnostic (OBD) System Check"
performed?
2 Will the engine start?
3 1. Install the Tech 2. Clear the Diagnostic Trouble
Code.
2. Idle the engine for one minute.
Does Diagnostic Trouble Code P0203 reset?
4 1. Review the Freeze Frame data with the ignition ON
and the engine OFF and note the parameters.
2. Operate the vehicle within the Freeze Frame
conditions as noted.
Does P0203 reset?
5 1. Ignition OFF.
2. Disconnect the injector test connector.
3. Install the injector test light J 39021–45 on the
injector connector.
4. Crank the engine while observing the light for
cylinder 3.
Does the injector test light blink?
6 Note whether the injector test light was OFF or ON
steady in step 5.
Was the test light ON steady while cranking the
engine?
Action
13. Normal injector resistance is slightly more than if
tested directly at the injector because it includes
resistance of the harness wires. The normal value is
about 13.5 W.
Value(s)
— Go to Step 2
— Go to Step 3
— Go to Step 5
— Go to Step 5
Go to Fuel
Injector Coil
— Procedure
— Go to Step 7
901RX034
Yes No
Go to OBD
System
Check
Go to Engine
Cranks But
Will Not Run
Chart
Go to Step 4
Go to
Diagnostic
Aids
Test
Go to Step 6
Go to Step
10