It is referred to as the transmission control relay output circuit or switched battery.
Power relay control circuit high.
Battery positive voltage is supplied.
The relay output is fed back to the powertrain control module.
When the relay is off no power is supplied to the solenoid pack and the transmission is in limp in mode.
The powertrain relay is a normally open relay.
The circuit that powers the electromagnet s coil is completely separate from the circuit that is switched on or off by the relay s switch so it s possible to use a relay whose coil requires just a few volts to turn a line voltage circuit on or off.
Ecm pcm power relay control circuit high.
This diagnostic trouble code dtc is a generic powertrain code and applies to many obd ii vehicles 1996 newer.
P0686 ecm pcm power relay control circuit low p0687 ecm pcm power relay control circuit high.
It is referred to as the transmission control relay output circuit or switched battery.
The relay output is fed back to the powertrain control module.
If a defective control module is suspected the better option would be to refer the application to the dealer or other competent repair facility for professional diagnosis and repair.
Learn what engine control module power relay control circuit high means location and how to repair.
The pcm powertrain control module also known as ecm or engine control module in other vehicle makes comes with a power relay that provides battery voltage safely to the right pcm circuits.
That may include but is not limited to vehicles from hyundai kia smart jeep dodge ford dodge chrysler etc.
It s a contact type relay activated with a signal wire from the ignition switch.
Although generic the engines differ between brands and may have slightly different causes for this code.
What does p0887 mean.
In most cases when the pcm stores a p0687 code it s because it has detected overly high voltage from its power supply.
The relay armature is held in the open position by spring tension.
This diagnostic trouble code dtc is a generic powertrain code which means that it applies to all 1996 newer vehicles vw bmw chrysler acura audi isuzu jeep gm etc.
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.
When the relay is off no power is supplied to the solenoid pack and the transmission is in limp in mode.
What the p0687 code means.
What does that mean.
For this relay the coil requires just 12 vdc to operate and pulls just 75 ma well under.
