Question94 Dodge Spirit V6. 200,000 + miles. Car stalls while driving. Pulled the codes and got codes 12,14, 37 and 51. Code 12 is memeory stand by power lost. 14 is MAP Sensor voltage high/low. 37 Part throttle solenoid driver circuit. 51 O2 sensor lean. My question is would the MAP sensor malfunctioning make the 02 sensor read lean or should I replace them both? Also what to I do for the code 37, part throttle unlock solenoid driver circuit? Plugs, wires, cap and rotor were recently changed. Codes explantions came from a Haynes book. Anybody that could help I would greatly appreciate. Thank you. Mike.
AnswerHi Mike,
I would look first at the MAP sensor because if it is not working right the mixture will not be appropriate and the 02 sensor may not be able to correct the situation to get a good mixture, thus setting off the O2 sensor code as well. The MAP code could be due to a vacuum leak in the hose between the sensor and the intake manifold, a problem with the wires connecting the MAP to the engine controller, or due to a worn out sensor. So take the MAP evaluation in that order. The wires are connected: dark green/red to pin 1, violet/white to pin 6, and black/light blue to pin #4 of the 60-way plug. To locate the pins: hold the plug horizontally with the pins facing you and the short tab up.
#1 in on the far left of the top row, read 1-20 left to right across that row. If the hose and wiring is o.k., then disconnect the battery for 5 minutes and restart and operate the engine. Disconnecting the battery clears the code, and running the engine will allow you to see is the 14 code comes back again, in which case you need a new MAP.
You will find the MAP mounted on the alternator bracket.
Then once the MAP is resolved, clear the codes again and see if 51 code comes back, in which case you need a new O2 sensor, or again first check the wires from it to the ecm. (Write back a follow up question for the wire assignment for the O2 sensor).
On the 37, does the torque converter lock up the way it is supposed to when you get to cruising speed? If not, then again you could check the wiring from the trans control module to the solenoid pack on the trans. That is the 8-pin plug at the trans. Unfortunately, the manual doesn't show which of the 8 wires controls the lock up but write back again for the assigmentment for those 8 wires if you want to verify that wiring is not the problem. If those check out, then it is in internal problem with the lock up solenoid that requires possibly dismantling the trans, a very expensive proposition which is not likely to be cost effective as this lockup provision only causes a slight increase in mpg on the highway (maybe 5%).
Feel free to follow up on any of these issues. And good luck with your efforts to solve these!
Roland
