Impulse Readout of LH-SFI Control Module
07.4-91101 Impulse Readout (malfunction memory) of Engines 104, 119, 120 Revised 7/92 - 10/91LH-SFI Control Module with LH-SFI
If the LH-SFI fuel injection malfunction memory has impulse readout 4 or 10, perform the following procedures.
1) On/off ratio readout with ignition ON.
2) On/off ratio readout with engine at idle
3) If the on/off ratio readout is fixed at 50 % with ignition ON, and oscillates with engine at operating temperature and idling, the malfunction memory is in error.
Remedy:
1,2) If On/off ratio readout is fixed at a value other than 50 % with ignition ON, and/or does not oscillate with engine at operating temperature and idling, perform diagnostics.
3) Replace LH-SFI control module with version listed in parts information table below.
Parts Information:
LH-SFI Control Module
LH Malfunction Memory