When does the cam sensor go down to 0 volts?
When the camshaft position sensor is activated (and if it’s working correctly) by the pole piece on the camshaft, then this voltage will go down to 0 Volts. Remember, the multimeter will only register the 0 Volts only once per two complete turns of the crankshaft pulley.
How to measure voltage on a crankshaft censor?
Measure voltage at CMP sensor harness connector between sensor feed circuit and sensor ground circuit. If reading is about battery voltage, go to step 11). If reading is not as specified, go to next step. Measure voltage between CMP positive connector at CMP sensor harness connector and ground. If reading is about battery voltage, go to step 9).
Where is the camshaft sensor located on the crankshaft?
The camshaft sensor housing is installed on the face of the timing cover where the Optispark distributor used to reside. A 1996ñ1997 LT1 timing cover is required. Due to the crankshaft seal area of the GM LT1 timing cover, a crankshaft reluctor and double-row timing set cannot be used with a GM LT1 timing cover.
How does the PCM detect the camshaft position?
The input to the PCM occurs on a 5-volt output reference circuit. The CMP sensor operates in the same manner as the CKP sensor, except that with the CMP sensor, there are only two edges to detect. The PCM identifies camshaft position by registering the change from 5 to 0 volts or 0 to 5 volts, as signaled by the cam sensor.
The camshaft sensor housing is installed on the face of the timing cover where the Optispark distributor used to reside. A 1996ñ1997 LT1 timing cover is required. Due to the crankshaft seal area of the GM LT1 timing cover, a crankshaft reluctor and double-row timing set cannot be used with a GM LT1 timing cover.
When the camshaft position sensor is activated (and if it’s working correctly) by the pole piece on the camshaft, then this voltage will go down to 0 Volts. Remember, the multimeter will only register the 0 Volts only once per two complete turns of the crankshaft pulley.
How to diagnose the camshaft position ( CMP ) sensor?
To successfully diagnose the camshaft position (CMP) sensor on your 3.1L or 3.4L equipped car or mini-van (Buick, Chevrolet, Oldsmobile, or Pontiac), you’ll need to jack up the car to be able to hand-turn the crankshaft pulley. This involves using a jack stand to hold up the car (or mini-van) and safeguard your safety.
Which is the signal wire for the cam sensor?
Place the multimeter in Volts DC mode. Connect the red multimeter test lead to the green (GRN) wire of the 3-wire connector. The GRN wire is the signal wire that transmits the camshaft position sensor signal to the PCM and is the one labeled with the letter B in the photo.