1, 2 and 3 Digit Codes: 39

Scan Tool 39 (MIL 13):

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 width.
- The sensor should measure a difference in manifold pressure between key ON and after the engine is running.

Range of Check
- Vehicle is not moving.
- Engine: The engine idle speed is almost identical to the target idle speed while the engine is idling.

Set Condition
- Diagnostic trouble code (DTC) memory is not deleted even after the ignition switch is turned off.
- The difference between the two following MAP values is small for 2 seconds:
- The value immediately after the ignition switch is turned to ON.
- The value while the engine is at idle.

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