A P0687 code is stored when the PCM (powertrain control module) detects an incorrect, abnormal, or erratic voltage reading from the relay control circuit that supplies it with its power.
How do I fix code P0685?
What repairs can fix the P0685 code?
- Repair of shorts or bad terminals or connections.
- Replacement of the powertrain control module relay.
- Underhood junction block replacement (fuse box)
- Replacement of battery cables and/or connectors.
- Fuse replacement.
WHAT IS A engine control module relay?
The ECM power relay is the relay responsible for sending power to the ECM. If the relay fails, or has any issues, it can cause the vehicle to have all sorts of problems, and may even render it undriveable.
What causes code P068A?
OBD II fault code P068A is a generic trouble code that is defined as “ECM/PCM Power Relay De-Energized Performance – Too Early”, and is set when the PCM (Powertrain Control Module) detects an improper de-energizing procedure for the relay that supplies it with power.
What does code P068A mean?
Zitat von Youtube: Po68a is a diagnostic trouble code for ecm or pcm power relay to energize performance too early.
Where is the ECM power relay?
engine main fuse relay control box
The relay is located in the engine main fuse relay control box. The defective ECM-power relay is removed from the control box by pulling it straight up and out of socket. The new ECM-power relay is installed into the socket and the engine scanned for codes.
What is a ECM PCM power relay?
The engine control module (ECM) or powertrain control module (PCM) runs various processes in the engine and (in the case of the PCM) the transmission to achieve maximum efficiency. The PCM regularly checks the voltage condition in the power relay control circuit that delivers battery voltage to the ECM/PCM.
How do you fix an ECM failure?
Fortunately, these issues can usually be resolved by replacing the corroded wires. If one of the wires shorts out to the frame, the ECM may fail entirely. This can also happen due to power surges due to a lightning strike or arc welding on the vehicle frame. Installing a new starter can also cause ECM failure.
How do you check if a relay is bad?
The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).
How can I tell if a relay is bad?
Zitat von Youtube: Out. Sit it down right there take your other relay. Out. Alright and swap them and then see if the problem goes away with your horn see if it blows if it blows then you probably had a bad relay.
What does code P06B8 mean?
What does OBD-II fault code P06B8 mean? OBD-II Code Powertrain Control Module (PCM) failure is defined as a Internal Control Module non-Volatile Random Access Memory. The engine control module (PCM) communicates with all the other control modules the vehicle is equipped with.