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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 86 (Engine Control System & Fuel System - 3.7L - Diagnosis & Troubleshooting) >> Malfunction Indicator Lamp (MIL) Always On >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 2:  This step determines if the condition is with the MIL control circuit or the PCM.
Malfunction Indicator Lamp (MIL) Always On

Step Action Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Turn OFF the ignition.
  2. Disconnect the powertrain control module (PCM).
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the malfunction indicator lamp (MIL).
Is the MIL illuminated?		 Go to Step 3  Go to Step 5 
3 Test the MIL control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 6  Go to Step 4 
4 Replace the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement .
Did you complete the replacement?		 Go to Step 6  -
5 Replace the PCM. Refer to Control Module References .
Did you complete the replacement?		 Go to Step 6  -
6
  1. Turn the ignition OFF for 30 seconds.
  2. Start the engine.
Does the vehicle operate correctly without any unwanted MIL illumination, and without any stored DTCs?		 System OK Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information
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