Isuzu 1999 RODEO Workshop Manual page 716

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. Refer to On–Vehicle Service in
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. Honk the horn to verify that the horn relay is
functioning.
2. Substitute the horn relay for the fuel pump relay.
3. Leave the test light connected as in step 12.
4. Command the fuel pump ON with the Tech 2.
Did the test light illuminate for 2 seconds when the fuel
pump was commanded ON?
14 1. Re–connect the horn relay in its proper location.
2. Check for a short circuit, blown fuse or open circuit
between the relay and the fuel 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 1. Re–connect the horn relay in its proper location.
2. Replace the fuel pump relay.
Is the action complete?
18 Replace the fuel pump.
Is the action complete?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Fuel System Electrical Test (Cont'd)
Action
replacement PCM must
Module and Sensors
Value(s)
— Verify repair
— Verify repair
be
for
— Verify repair
Go to Step 15
—
Go to Step 17
—
— Verify repair
Go to Step 18
—
— Verify repair
— Verify repair
— Verify repair
6E1–89
Yes No
Go to Step 10
Go to Step 11
—
Go to Step 13
Go to Step 14
—
Go to Step 16
—
—
—