GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2000 🢒 S/T Isuzu - 2WD 🢒 Engine 🢒 Engine Controls - 2.2L 🢒 Malfunction Indicator Lamp (MIL) Always On

Refer to

MIL and Generator


Object Number: 538527 Size: FS
Engine Controls Components
Powertrain Control Module Description
Data Link Connector (DLC)
Power and Grounding
OBD II Symbol Description Notice
AUX PWR, RDO BATT and HDLP SW Fuses
Power and Ground
Power
Handling ESD Sensitive Parts Notice
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice

Circuit Description

When the ignition is turned ON, the malfunction indicator lamp (MIL) will momentarily flash ON then OFF and remain ON until the engine is running, if no diagnostic trouble codes (DTCs) are stored. The Powertrain Control Module (PCM) controls the MIL by providing a ground path through the MIL control circuit to turn ON the MIL.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. This step tests the ability of the PCM to control the MIL. The scan tool has the ability to command the MIL ON and OFF.

    2.

  2. The replacement PCM must be programmed and the Crankshaft Position System Variation Learn procedure must be performed.

Step

Action

Values

Yes

No

1

Did you perform the Powertrain On Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

  1. With the scan tool, Select Special Functions Outputs/MIL.
  2. Command the MIL ON and OFF.

Does the MIL turn ON and OFF when commanded?

--

Go to Step 7

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Disconnect the PCM connectors.
  3. Turn ON the ignition, with the engine OFF.

Does the MIL illuminate?

--

Go to Step 4

Go to Step 6

4
  1. Test the MIL control circuit for a short to ground.
  2. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 7

Go to Step 5

5

Replace the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Did you complete the replacement?

--

Go to Step 7

--

6

Important:: The replacement PCM must be programmed.

  1. Turn OFF the ignition.
  2. Replace the PCM. Refer to the Powertrain Control Module Replacement/Programming .

Did you complete the replacement?

--

Go to Step 7

--

7
  1. With the scan tool, Select Special Functions Outputs/MIL.
  2. Command the MIL ON and OFF.

Does the MIL turn ON and OFF when commanded?

--

System OK

Go to Step 1