1, 2 and 3 Digit Codes: 39

Trouble Code Number
- Scan tool 39
- General scan tool P1297
- MIL 13

Fault Message
- No Change in MAP From Start to Run

Background
- The MAP sensor is mounted to intake manifold vacuum.
- This information provides an important PCM input for determining fuel injector pulse wide.
- The sensor should measure a difference in manifold pressure between key ON and after the engine is running.

Range of Check
- Vehicle speed: Less than 1 mph
- Engine: The engine idle speed is almost identical to the target idle speed while the engine is idling.

Set Condition
- The MAP value immediately after the ignition switch is turned to ON is lower than the MAP value while the engine is idling for 2 seconds.

Probable Cause
- Ice in sensor
- Sensor failed
- PCM failed