Storm L4-1600cc 1.6L SOHC (1990)
Engine Control Module: Service and Repair
SERVICE OF THE ELECTRONIC CONTROL MODULE (ECM)
Service of the ECM consist of replacement of ECM only. If the diagnostics call for replacement of the ECM, it will be necessary to program the
Electrically Erasable Programmable Read Only Memory (EEPROM) in the ECM using the following procedure.
NOTE: It is important to transfer the broadcast code and production ECM number to the service ECM label. Please do not record on ECM cover.
This will allow positive identification of ECM parts throughout the service life of the vehicle.
CAUTION:
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To prevent internal ECM damage, the ignition must be "OFF" when disconnecting or reconnecting power to ECM (for example; battery cable,
ECM pigtail, ECM fuse, jumper cables,).
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To prevent possible electrostatic discharge damage to the ECM, Do Not touch the connector pins or soldered components on the circuit board.
REMOVAL
1. Disconnect the negative battery cable.
2. Remove the two (2) 10 mm nuts at ECM.
3. Disconnect the connectors from ECM.
4. Remove the ECM from mounting bracket.
5. Remove the ECM from driver's compartment.
INSTALLATION
1. Install the mounting bracket to the ECM.
2. Connect the ECM connectors to ECM.
3. Two (2) 10 mm nuts and tighten to 2.2-3.4 Nm (17-30 in lb).
4. Connect the negative battery cable.
5. Reprogram the EEPROM, refer to Tech 1 scanner/Computer Aided Manufacturing (CAM) user's instructions.
6. If ECM fails to reprogram, do the following:
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Check all ECM connectors.
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Check Tech 1 cartridge for version date.
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Retry to program ECM. If it fails again, replace ECM.
FUNCTIONAL CHECK
1. Turn ignition "ON."
2. Enter diagnostics mode.
a. Allow code 12 to flash four times to verify no other codes are present. This indicates the reprogrammed ECM is functioning properly.
b. If trouble code 42 or 51 occurs, or if the "Check Engine" light is "ON" constantly with no codes, the ECM is defective.
c. If it is necessary to replace the ECM, follow the previous removal/installation instructions.
