DTC P0103: Mass Airflow (MAF) Circuit High Input
NOTE:
For PCM connector and terminal identification, see PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS
article.
- Connect scan tool to Data Link Connector (DLC). Start engine and allow it to reach normal operating temperature. Select MAF SENSOR FLOW RATE parameter on scan tool. See MAF SENSOR STANDARD VALUES table for specified values. If scan tool display is not within specifications, go to next step. If scan tool displays specified values, check for an intermittent problem. SeeTROUBLE SHOOTING - NO CODES article.
- With ignition switch on and engine off, measure voltage (backprobe) between PCM harness connector terminal C51-3-5 (Purple/Green wire) and terminal C51-3-10 (Purple/White wire). If voltage is 1.0-1.6 volts, go to next step. If voltage is not as specified, check for an open circuit in Purple/Green wire between MAF sensor and PCM, or a short circuit to power in Purple/White wire. Repair as necessary. If wires are okay, replace MAF sensor and retest system.
- Start engine and measure voltage (backprobe) between PCM harness connector terminal C51-3-5 (Purple/Green wire) and terminal C51-3-10 (Purple/White wire). If voltage increases to 5 volt range while engine speed is increased, replace PCM. If voltage is not as specified, replace MAF sensor and retest system.
MAF SENSOR STANDARD VALUES
| Application | Lbs/min. (Grams/Sec.) | |
|---|---|---|
| At Idle | ||
| 1.6L | 0.14-0.38 (1.1-2.9) | |
| 2.0L | 0.20-0.53 (1.5-4.0) | |
| At 2500 RPM | ||
| 1.6L | 0.66-1.12 (5.0-9.0) | |
| 2.0L | 0.66-1.32 (5.0-10.0) | |