Fault Code 11 - No Crank reference
signal at PCM
When the crank sensor fails, the engine will die but no code is set. Code 11
will only set if the computer has never seen a pulse from the crankshaft rotation
sensor. If the engine has been running in the past, this code will not be set
because the computer remembers that the sensor was working. To check for this
fault, the computer memory must be erased.
When you have a no-start condition, disconnect the battery for about 15 seconds.
Reconnect and crank the engine for 7 seconds. Now pull the codes again. If you
get a code 11, it means that the crank Hall Effects sensor or its associated
wiring is defective. To determine whether the sensor is bad or the wiring is
- locate the wiring harness connector closest to the distributor or crankshaft
- With the ignition switch in the off position, disconnect the three-wire
- Now turn the ignition switch back on and measure the voltage on the three
wires at the computer end of the wiring harness.
- At least one of the wires should have between 7 and 10 volts. This is
the power supply wire for the Hall Effects.
- One of the other two wires should have a voltage that is a little lower
than the power supply wire. When the engine is cranked, this signal alternates
between 0 and 7-10 volts as the Hall blades rotate. The alternation may
be too fast for many voltmeters, but the indicated volatage will be less
than the supply voltage.
- The third wire, the one without the voltage, should have continuity
- Verify this with a voltmeter. Remember that the ground wire, although it
will be continuous with ground, will have some resistance in it. Expect the
resistance to be somewhere between 0 ohm and few hundred ohms. If the resistance
reads infinity, this wire is open and must be repaired.
- If the wiring harness checks out good, then replace the Hall Effects sensor.
This page would not have been possible without the help
of Hank LaViers,
who graciously loaned me his extensive Mopar engine library
Last Update: August 8, 2001