Isuzu 20LE - Poor Connection or Damaged Harness - Inspect the ECM Harness and Connectors for Improper Mating

6E1-212 DRIVEABILITY AND EMISSIONS
Diagnostic Aids
An intermittent may be caused by a poor connection,
rubbed-through wire insulation, or a wire broken inside
the insulation. Check for the following items:
• Poor connection or damaged harness - Inspect the
ECM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal-to-wire connection, and
damaged harness.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. If the MIL does not remain ON when the ECM is
disconnected, the MIL driver wiring is not faulty.
3. If the MIL driver circuit is OK, the instrument panel
cluster is faulty.
DTC (Flash DTC = 57)
Check Engine Lamp High Error
Step Action Value(s) Yes No
1
Was the “On-Board Diagnostic (OBD) System
Check” performed? -
Go to Step 2
Go to OBD
System
Check
2
1. Ignition OFF, disconnect ECM.
2. Ignition ON, observe the MIL.
Is the MIL ON?
-
Go to Step 3 Go to Step 5
3
1. Ignition OFF, disconnect the instrument panel cluster.
2. Check the MIL driver circuit between the ECM and the
instrument panel cluster for a short to battery.
3. If a problem is found, repair as necessary.
Was the MIL driver circuit shorted to battery?
- Go to OBD
System
Check Go to Step 4
4
Replace the instrument panel cluster.
Is the action complete? -
Go to OBD
System
Check
-
5
1. Ignition OFF, reconnect the ECM.
2. Refer to On-Vehicle Service in Engine Control Module
and Sensors for procedures.
3. Using the scan tool output controls function, select MIL
dash lamp control and command the MIL OFF.
Did the MIL turn OFF?
-
Go to OBD
System
Check Go to Step 6
6
Replace the EPROM or ECM. Note) Refer to 6E1-243.
-
Go to OBD
System
Check
-