Isuzu 1999 RODEO Workshop Manual page 1337

6E2–94
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Step
9 Check for short or open between the PCM and the fuel
pump relay.
Was a problem found?
10 1. Check the fuel pump relay circuit for a poor terminal
connection at the PCM.
2. If a problem is found, replace terminal as necessary.
Was a problem found?
11 Replace the PCM.
IMPORTANT: The
programmed.
Powertrain Control
procedures.
And also refer to 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?
12 1. Reconnect the fuel pump relay.
2. Disconnect the fuel pump electrical connector at the
fuel tank.
3. Using a test light connected to ground, probe the
fuel pump feed wire (harness side).
4. Command the fuel pump "ON" with a Tech 2.
Did the light illuminate for 2 seconds?
13 1. Substitute a known good realy for the fuel pump
realy.
2. Leave the test light connected as in step 12.
3. Command the fuel pump "ON" with the Tech 2.
4. After this test, re-connect the known good relay in
its proper location.
Did the test light illuminate for 2 seconds when the fuel
pump was commanded "ON?"
14 Check for a short circuit, blown fuse or open circuit
between the relay and the fule tank.
Is the action complete?
15 1. With the fuel pump electrical connector at the fuel
tank disconnected, connect a test light between the
feed wire and the ground wire (harness side).
2. Command the fuel pump "ON" with a Tech 2.
Did the test light illuminate for 2 seconds?
16 Repair the open circuit in the fuel pump ground wire.
Is the action complete?
17 Replace the fuel pump relay.
Is the action complete?
18 Replace the fuel pump.
Is the action complete?
Fuel System Electrical Test (Cont'd)
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
Verify repair Go to Step 10
Verify repair Go to Step 11
Verify repair —
Go to Step 15 Go to Step 13
Go to Step 17 Go to Step 14
Verify repair —
Go to Step 18 Go to Step 16
Verify repair —
Verify repair —
Verify repair —