DTC P0107: Map Sensor Circuit Low Input
NOTE:
If DTC P0107, P0122 and/or P0450 are set together, check Light Green wire (terminal No. 1, PCM 16-pin harness connector) for open circuit.
- Connect scan tool to Data Link Connector (DLC). Turn ignition on. Check intake manifold absolute pressure using scan tool. If display reads 5 kPa or less, go to next step. If display reading is not as specified, check for an intermittent problem. See TESTS W/O CODES article.
- Turn ignition off. Disconnect MAP sensor harness connector. Turn ignition on. Using a voltmeter, measure voltage between ground and Light Green wire on harness connector. If reading is 4-6 volts, go to next step. If reading is not 4-6 volts, check Light Green wire for open or short to ground. Repair as necessary. Retest system.
- Turn ignition off. Disconnect PCM 16-pin connector. Using an ohmmeter, ensure continuity exists between Orange/Green wire on MAP harness connector and terminal No. 5 on PCM 16-pin harness connector. Ensure continuity does not exist between Orange/Green wire and ground. If continuity is as specified, go to next step. If continuity is not as specified, repair Orange/Green wire for an open or short to ground. Retest system.
- Reconnect PCM connector. Check for continuity between ground and Light Green/Black wire at MAP sensor harness connector. If continuity exists, go to next step. If continuity does not exist, repair open in Light Green/Black wire between MAP sensor harness connector and terminal No. 9 on PCM 16-pin harness connector. Retest system.
- Disconnect vacuum hose from MAP sensor. Remove MAP sensor. Connect three 1.5 volt batteries in series. Connect positive terminal of batteries to "In" terminal of MAP sensor. See Fig 1 . Connect negative terminal of batteries to "Ground" terminal of MAP sensor. Using a voltmeter, measure voltage between terminals "Vout" and "Ground" of MAP sensor. Ensure voltage is as specified. See MAP SENSOR OUTPUT VOLTAGE table. Ensure voltage decreases as vacuum (up to 15 in. Hg) is supplied to MAP sensor. Replace MAP sensor if voltage is not as specified. If MAP sensor tests okay, replace PCM. Retest system.
MAP SENSOR OUTPUT VOLTAGE
| Altitude (Ft.) | Barometric Pressure (psi) | Output Volts |
|---|---|---|
| 0-2000 | 13.6-14.5 | 3.1-3.6 |
| 2001-5000 | 12.3-13.6 | 2.8-3.4 |
| 5001-8000 | 11.0-12.3 | 2.6-3.1 |
| 8001-10,000 | 10.2-11.0 | 2.4-2.9 |