What do codes 77 and 34 mean?

Tiny
BRISNFT87
  • MEMBER
  • 1994 CHRYSLER NEW YORKER
  • V6
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
My car keeps shutting off on me. Seems like when the motor gets hot and sometimes it’ll start right back up sometimes it won’t start right back up. Sometimes when I’m driving down the road it’ll shut off and start it self back up, but it seems like when the motor starts to get hot he wants to shut off. But I got code 77 code 34. Not quite sure what they mean. So I cannot for the life of me figure it out. I’ve change the O2 sensor, the crankshaft sensor, plugs and wires, alternator and I cannot figure it out. Any help would be greatly appreciated.
Wednesday, November 18th, 2020 AT 9:21 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I posted the flow charts for the codes below for you to review.

Both codes are for speed control or cruise control.

Roy

PURPOSE

This input informs Powertrain Control Module (PCM) of speed control status

OPERATION

The speed control system provides four different input signals to the PCM; ON/OFF, SET, and RESUME.

The input, ON, indicates to the PCM that the speed control system has been activated by the driver.

The input, SET, indicates to the PCM that a specific vehicle speed has been selected by the driver.

The input, RESUME, indicates to the PCM that the previously SET speed has been requested by the driver.

The input, OFF, indicates to the PCM that the speed control system has been deactivated by the driver.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Was this
answer
helpful?
Yes
No
+1
Wednesday, November 18th, 2020 AT 1:03 PM
Tiny
BRISNFT87
  • MEMBER
  • 2 POSTS
Okay, so how do I fix the problem? The car keeps shutting off because of it.
Was this
answer
helpful?
Yes
No
Wednesday, November 18th, 2020 AT 9:28 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You will need to follow the charts I posted for you to determine the failure.

Follow it step by step until you find something that tells you to replace a defective part or if you have a wiring issue.

Roy
Was this
answer
helpful?
Yes
No
-1
Thursday, November 19th, 2020 AT 1:21 AM

Please login or register to post a reply.

Related OBD1 Code 34 Content