Checking the Malfunction Indicator Lamp

Checking Malfunction Indicator Light (CHECK ENGINE Light):

1 Connect an ISAT scan tool, contact the SFI system and enter command code 3043.


Check whether the malfunction indicator lamp (MIL) flashes (at a frequency of 1 Hz).


2 If it does not, check whether the EDU is programmed for the type of car in question.

3 With the ignition switched off, connect a break-out box to the ECM and cable.


Turn the ignition switch to the Drive position, connect a jumper cable between terminals 32 and 24 of the break-out box and check whether the MIL lights up. If it does, continue with point 6.

If it does not, continue as described below.

4 Check whether voltage is present up to pin 37 of the EDU. If it is, the EDU is faulty and must be replaced.

If it is not, check the lead from the + 15 voltage supply.

5 Remove the jumper cable and, with the ignition switched off, check the lead between pin 12 of the EDU and pin 32 of the control module for continuity/shorting to ground. Take remedial action if the lead is faulty.

6 If no fault can be found in spite of the above checks, the ECM may be faulty. Review "Before Replacing ECM."



NOTE:
When command code 30XX has been used, the car cannot be started for the following 12 minutes. Use command code FF00 to clear the function, following which the car can be started.

MIL Function Check

MIL Function Check:

MIL Function Check Table:

1 Connect an ISAT scan tool, contact the SF1 system and enter command code EE65.


Compare the status of the system as displayed on the ISAT scan tool with the malfunction indicator lamp (MIL) in the car, according to the following table:

2 With the ignition switched off, connect a BOB to the ECM wiring harness (ECM disconnected) and check the lead to pin 32 of the ECM for continuity/shorting to ground.


If the lead is faulty, remedy it.

MIL Function Check:

3 If the lead is OK, the ECM may be faulty. Review "Before Replacing ECM."

4 PAE65-ON displayed by the SAT scan tool at the same time as the MIL is illuminated indicates a fault in the SFI system. Use the ISAT to ascertain any faults in the SFI system, remedy the faults and then erase the DTCs.

Check as described in point 1 that PAE65-OFF is now displayed on the SAT scan tool when the MIL is out.

5 Check the MIL as described in previous section.