Just for comparison I just tested my 5 year old battery. It might not make it through the winter but here are the numbers no load and 30 seconds with high beams on.
@Traxy , I disconnected the PCV valve pipe from the intake manifold today.mjbjr25 You must have meant the intake air filter!
DJDern Did you check the water trap under the air filter? Did you remove the air filter? Sometimes rodents get in there and build a nest and starve the air going through the air filter which in turn starves the mass air flow sensor. This will set this code.
Sometimes they eat the bottom out of the filter and then you get the opposite, too much air flow, but this rarely puts out a code. If it was the MAF sensor you'd get a P0101 or P0102
DIAGNOSTIC INFORMATION AND PROCEDURES >P1101:
THROTTLE BODY AIR FLOW PERFORMANCE/INTAKE AIR FLOW SYSTEM
PERFORMANCE > CIRCUIT/SYSTEM TESTING
Verify the integrity of the entire air induction system by verifying that none of the following
1. Any damaged, improperly installed, collapsed, or restricted components
2. Loose clamps, cracks, or other damage
3. An air flow restriction
4. Restricted air filter
5. Splits, kinks, leaks, or improper connections at the vacuum hoses
6. Vacuum leaks at the intake manifold, MAP sensor, and throttle body
7. Water intrusion
8. Any snow or ice buildup, in cold climates
9. Contamination of the MAF sensor element
Missing, restricted, or leaking exhaust components-Refer to Symptoms - Engine
Exhaust for further diagnosis.
An other little demon with these vehicles is the battery. A failing but yet still good battery will cause all kinds of gremlins because the sensors in these vehicle need regulated 11 volts. If at idle when the alternator cuts out because the engine is turning too slow and you happen to have a weak cell and voltage drops to 10.25 Volts then all həll breaks loose. So if it is clear under the filter try swapping the battery with a known good one to see if this clears up your problem. Cabin air filter has zero to no effect on the MAF sensor