Voltage

Tiny
AZJETSFAN
  • MEMBER
  • 2002 CHRYSLER PT CRUISER
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 129,000 MILES
The car is giving a P0340 code. If it is cleared it comes right back on. The thing is the car starts, runs, and drives great. No stalling, stumbling, or hesitation. It does takes about six to eight seconds of cranking before it starts. Going through the car the only thing I found is the wire from the PCM that supplies the 8 volts to the CKP and CMP is only showing 3.5 volts. Does this indicate a bad PCM or is there something else I should be checking out first? I am just confused because the car runs and drives perfect. Any advice you can provide would be greatly appreciated. Thank you.
Monday, June 25th, 2018 AT 10:29 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good afternoon.

First of all, clearing does absolutely nothing. The issue is there and needs to be checked.

The first place to start is the harness. Behind the connector is the wrapping for the harness. Unwrap it and see if the insulation is gone and the wires are touching together. Very common issue.

Roy

P0340
Item Description
Symptom/DTC P0340
Descriptor
No Cam Signal At Pcm
Probable Causes
8 Volt Supply Circuit Open
8 Volt Supply Circuit Shorted to Ground
8 Volt Supply Circuit Shorted to Voltage
Camshaft Position (CMP) Sensor
Camshaft Position (CMP) Sensor Signal Circuit Open
Camshaft Position (CMP) Sensor Signal Circuit Shorted Ground
Camshaft Position (CMP) Sensor Signal Circuit Shorted to Voltage
Camshaft Position (CMP) Sensor Signal Shorted to 8 Volt Supply Circuit
Intermittent Camshaft Position (CMP) Sensor Signal
Intermittent Condition
Intermittent Crankshaft Position (CKP) Sensor Signal
Intermittent Wiring
Powertrain Control Module (PCM) 8 Volt Supply
Powertrain Control Module (PCM) Camshaft Position (CMP) Sensor Signal
Sensor Ground Circuit Open
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Monday, June 25th, 2018 AT 12:04 PM
Tiny
AZJETSFAN
  • MEMBER
  • 6 POSTS
I did unwrap the wires coming right out of the PCM. That is where I checked for the 8 volt power to the sensors. Not even an inch from the PCM connector. Or are thinking that the problem could be between the power distribution box and the PCM? But why is it that the car runs so good with the lack of voltage to the sensors?
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Monday, June 25th, 2018 AT 9:57 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Not from the PCM, from the sensor.

It barely has enough voltage to make it run.

Roy
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Tuesday, June 26th, 2018 AT 3:26 AM
Tiny
AZJETSFAN
  • MEMBER
  • 6 POSTS
See that is just it. The car car runs great. At an idle or driving down the road. This is what has me so confused. The 8 volt wire coming out of the PCM to the crank and cam sensors is 3.5 volts too. So I am going to cut the orange wire out of the PCM and if it still shows 3.5 volts I am going to replace the PCM.
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Tuesday, June 26th, 2018 AT 7:07 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
That may work but if it does, then that wire is an issue. In most cases, there is not just one wire that is an issue. It is more than one wire.

Roy
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Tuesday, June 26th, 2018 AT 7:10 AM

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