Manifold Absolute Pressure Sensor
1972 Dodge Challenger · 400ci V8
Sensor Type
piezoresistive
Waveform Type
dc-variable
Location
Not applicable - 1972 Challenger has no MAP sensor in stock configuration
Pins
Unknown
Timebase
N/A
Voltage Scale
N/A
Trigger
N/A
Wiring
Not applicable - mechanical vacuum system only
Expected Voltage Range
At Idle
0V to 0V
At Higher RPM
0V to 0V
Expected Pattern
Not applicable - no electronic sensors
Known-Good Waveform
This vehicle does not have an electronic MAP sensor. The 1972 400ci engine uses direct intake manifold vacuum to operate the distributor vacuum advance mechanism and carburetor power valve. Vacuum is transmitted through rubber hoses to mechanical diaphragms. Normal idle vacuum should be 16-20 inches Hg with properly tuned engine.
Common Failure Patterns
Not applicable
Cause: Not applicable
Diagnostic Tips
Manifold pressure diagnosis requires mechanical vacuum gauge. Test vacuum at idle, snap throttle, and cruise. Check distributor vacuum advance with timing light while applying vacuum to advance canister.
Related Diagnostic Trouble Codes
P0105P0106P0107P0108P0109
Always confirm waveform data with your vehicle's OEM service manual before diagnosing.
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