Manifold Absolute Pressure Sensor
1972 Dodge Challenger · 383ci V8
Sensor Type
piezoresistive
Waveform Type
dc-variable
Location
Not applicable - 1972 Dodge Challenger uses mechanical vacuum advance distributor without MAP sensor
Pins
Unknown
Timebase
N/A
Voltage Scale
N/A
Trigger
N/A
Wiring
N/A - vacuum controlled timing advance system
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0V to 0V
Expected Pattern
No electronic MAP sensor present on this vehicle
Known-Good Waveform
The 1972 383ci engine uses a mechanical vacuum advance system integrated into the distributor rather than an electronic MAP sensor. A vacuum diaphragm in the distributor responds directly to intake manifold vacuum through a vacuum hose connection, advancing or retarding ignition timing mechanically. Manifold vacuum is monitored using a mechanical vacuum gauge (normal idle vacuum 15-20 inches Hg at sea level).
Common Failure Patterns
N/A
Cause: No electronic MAP sensor on this vehicle
Diagnostic Tips
Diagnose vacuum-related issues using a mechanical vacuum gauge connected to intake manifold. Check vacuum advance diaphragm for leaks, verify advance mechanism moves freely, and inspect vacuum hose for cracks. Timing light with advance meter shows total mechanical and vacuum advance.
Related Diagnostic Trouble Codes
P0105P0106P0107P0108P0109
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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