Isuzu 1999 RODEO Workshop Manual page 704

17. This vehicle is equipped with a PCM which utilizes
an electrically erasable programmable read only
memory (EEPROM). When the PCM is replaced,
the new PCM must be programmed. Refer to PCM
Replacement and Programming Procedures in
Powertrain Control Module (PCM) and Sensors.
Step
1 Was the "On–Board Diagnostic (OBD) System Check"
performed?
2 Attempt to start the engine.
Does the engine start?
3 Check the meter fuse for the instrument cluster ignition
feed circuit.
Is the fuse OK?
4 1. Ignition ON.
2. Engine OFF.
3. Probe the ignition feed circuit at the cluster
connector with a test light to ground.
Is the test light ON?
5 1. Ignition OFF.
2. Disconnect the PCM.
3. Jumper the MIL driver circuit at the PCM connector
to ground.
4. Ignition ON.
Is the MIL ON?
6 Check the PCM ignition feed and battery feed fuses
(15A Engine fuse and 15A ECM fuse).
Are both fuses OK?
7 1. Ignition OFF.
2. Disconnect the PCM.
3. Ignition ON.
4. Probe the ignition feed circuit at the PCM harness
connector with a test light to ground.
Is the test light ON?
8 Probe the battery feed circuit at the PCM harness
connector with a test light to ground.
Is the test light ON?
9 Check for a faulty PCM ground connection.
Was a problem found?
10 Check for damaged terminals at the PCM.
Was a problem found?
11 Check for an open MIL driver circuit between the PCM
and the MIL.
Was a problem found?
12 Substitute a known "good" relay for the PCM main
relay.
Was the malfunction fixed?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
No Malfunction Indicator Lamp (MIL)
Action Value(s) Yes
— Go to Step 2
— Go to Step 3
— Go to Step 4
— Go to Step 5
Go to Step 10
—
— Go to Step 7
— Go to Step 8
— Go to Step 9
— Verify repair
— Verify repair
— Verify repair
— Verify repair
6E1–77
No
Go to OBD
System
Check
Go to Step 6
Go to Step 16
Go to Step 13
Go to Step 11
Go to Step 15
Go to Step 12
Go to Step 14
Go to Step 10
Go to Step 17
Go to Step 18
Go to Step 13