DC20 - DTC 0103: Check MAF Signal High Input to PCM

Diagnostic Trouble Code (DTC) 0103 indicates the MAF Signal went above 235 gm/sec. (4.70 volts) sometime during normal engine operation (Continuous), during Key On Engine Off Self-Test, or during Key On Engine Running Self-Test.

NOTE: DTC 0103 could be generated by foreign material blocking the MAF sensor screen causing an air flow restriction. if contaminants are found on the screen, check air filter installation in air cleaner tray and proper sealing of air cleaner and air tubes before proceeding. Rerun Quick Test after repair.

Possible Causes:
- Blocked MAF sensor screen.
- Damaged MAF sensor.
- MAF SIG harness short to VPWR.
- Damaged PCM.

- Start engine and bring to idle.

NOTE: If a KOER DTC 0505 is present, go to Diagnostic Trouble Code Charts. [1][2]Diagnostic Trouble Code (DTC) Charts

If stabilized idle is not at least 700 rpm, go directly to Symptom Flow Charts. Testing and Inspection

- Run throttle up to 1500 rpm for 5 seconds, and bring it back to idle.

- Access MAF PID with a Scan Tool.

NOTE: MAF PID should be greater than 235 gm/sec. (4.70 volts).

- Key Off.

- Disconnect MAF sensor.

- Key On, engine running.

- Again access MAF PID with a Scan Tool.

- Did the MAF PID drop from the previous reading to below 2.55 gm/sec. (0.39 volts)?

YES -- MAF SIG shorted to VPWR in MAF sensor. REPLACE MAF sensor. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

NO -- Power short in circuit but not in MAF sensor. Go to DC21. DC21 - Check MAF SIG For Short to Power (Excluding VREF)