Engine Management

Scan Tool 44 (MIL 42):

Trouble Code Number
- Scan tool 44
- General scan tool (None listed)
- MIL 42

Fault Message
- No MFI Relay (ASD relay) Output Voltage at PCM

Background
- The PCM senses operation of the MFI relay (ASD relay) by measuring relay voltage. (If relay turns to ON, voltage is high).
- This DTC indicates that no voltage is being sensed when the MFI relay (ASD relay) is being energized.

Range of Check
- Battery voltage: 8 V or more
- Ignition switch: ON
- Unless engine is cranking

Set Condition
- The relay voltage is low for 1 second.

Probable Cause
- MFI relay (ASD relay) output circuit open
- Fused B (+) circuit open
- MFI relay (ASD relay) failed
- Circuit in PCM failed