Does B3618 or B3605 Control Commanded Fueling..
Test: 2002 LS1B OS 12212156
Did a series of 6 Tunes (2 Closed-Loop, 4 Open-Loop) to see which Table controls Commanded Fueling:
1. MAF Enabled B3618 set to EQ 1.00. B3605 set to 1.13
Result: B3618 Controls Commanded EQ.
2. CLSD (MAF Disabled). B3618 1.00 EQ. B3605 set to 1.13
Result: B3618 Controls Commanded EQ.
3. Open-Loop SD (MAF Disabled). B3618 Set to 1.00 EQ. B3605 Set to 1.13
Result: B3605 Controls Commanded EQ.
4. OLSD B3618 Set to 1.16 B3605 Set to 1.13
Result: Commanded EQ follows Richer of B3605 & B3618
Test 5: OLMAF B0120 Set to 400 RPM, B3618 Set to 1.00, B3605 Set to 1.13
Result: Commanded EQ follows B3605
Test 6: OLMAF, B0102 Set to 400 Rpm, B3618 Set to 1.16, B3605 Set to 1.13
Result: Commanded EQ follows Richer of B3605 & B3618
Discussion: This has been a controversial topic. When does Table B3618 control fueling, or when does Table B3605 control Commanded EQ.. and when does the PCM pick the richer of the two?
Result: In ALL cases (MAF-Enabled or Disabled), in Closed-Loop B3618 controls ALL fueling or Commanded EQ.
Only in Open-Loop does the PCM pick the 'richer of the two'.
Summary:
PE mode fueling is commanded by:
- CLMAF : B3618
- CLSD : B3618
- OLMAF : richer of B3618, B3605, B3647
- OLSD : richer of B3618, B3605, B3647
Or more simply, PE mode fueling is commanded by:
- CL: B3618.
- OL: richer of B3618, B3605, B3647.
Or, even more simply, PE fueling is commanded by:
- the richest of the active fueling tables.
Note:
- in CL, the active fueling tables at WOT would be B3618.
- in OL, the active fueling tables at WOT would be B3618 and B3605 (B3647 for COS).