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P0688

Tiny
KVN4
  • MEMBER
  • 2005 CHRYSLER TOWN AND COUNTRY
  • 115,254 MILES
Got code p0688 from odometer test. Says ecm/pcm power relay sensor open circuit. How do I repair it, I dont know where to start looking. Thanks k
Thursday, March 21st, 2013 AT 8:10 AM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
YMPTOM
P0688-ASD RELAY SENSE CIRCUIT LOW

WHEN MONITORED
With ignition key on. Battery voltage greater than 10 volts.

SET CONDITION
No voltage sensed at the PCM when the ASD relay is energized. One Trip Fault.

POSSIBLE CAUSES
Intermittent condition
ASD relay
Fused B+ circuit
ASD relay output circuit open (no start)
IPM fuse & relay center
ASD relay output circuit open
PCM start
PCM
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Thursday, March 21st, 2013 AT 9:13 AM
Tiny
KVN4
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  • 48 POSTS
I have a no start or spark. Should I swith relay with a like one to see if still same condition. Whats the fused b+ circuit. Where to start
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Thursday, March 21st, 2013 AT 10:50 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Check all fuses with a test light first. The asd relay may be the issue but it controls both spark and fuel controls. Try one and see but switching usually does not work.

Roy
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Thursday, March 21st, 2013 AT 10:52 AM
Tiny
KVN4
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  • 48 POSTS
I switched relay with wiper relay and after few tries it started, I everything works but dont know if intermitton. Dont want to take my trip to school (35 miles away ) and have do again. Should I leave it for the day and when I get back take for a ride in my neighborhood. Should I keep looking for problem
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Thursday, March 21st, 2013 AT 11:16 AM
Tiny
ASEMASTER6371
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You will most likely need a shop to check on a scanner to look at these actions. Not something you can check at home unless you have a scan tool.

Roy
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Thursday, March 21st, 2013 AT 11:39 AM
Tiny
KVN4
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  • 48 POSTS
I have an obd2 scan tool is that what you mean, shows no codes found but doing odometer test I got the po688 code
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Thursday, March 21st, 2013 AT 11:43 AM
Tiny
ASEMASTER6371
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Does it give you info on the bcm controls?

Can you turn on and off controls?

Roy
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Thursday, March 21st, 2013 AT 11:51 AM
Tiny
KVN4
  • MEMBER
  • 48 POSTS
No just reads obd2 codes. No codes found. Been starting every 15 minutes and starts up. Odometer test still gives the po688 code.I want to try and get under fuse bloch to check wires but now I guess theres gona be snow again here in south eastern ma.
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Thursday, March 21st, 2013 AT 11:59 AM

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