[3rd Gen : 96-00]: 97 grand caravan P1493,P0117, &P0137 at same time
#1
97 grand caravan P1493,P0117, &P0137 at same time
Have a 97 grand caravan with code P1493,P0117, &P0137 all at the same time. the check engine warning light is displayed along with the low battery warning light. Also the temperature gauge does not move from cold even after engine has warmed.
Most threads here have suggested bad PCM, any other options or suggestions.
thx in advance
Most threads here have suggested bad PCM, any other options or suggestions.
thx in advance
#3
checked so far
- battery has been checked reading 12V when off around 13.53V when running
- checked the connections to the alternator, swapped out the alternator with a new one
- replaced thermostat and replaced the engine temperature gauge
None clear the codes. do I have to clear the codes after all these have been replaced?
- checked the connections to the alternator, swapped out the alternator with a new one
- replaced thermostat and replaced the engine temperature gauge
None clear the codes. do I have to clear the codes after all these have been replaced?
#5
Yes, the codes will be stored until you clear them with a reader. Or disconnect the battery for a half hour or so. I'd grab a haynes or chiltons manual it will have diagnostic checks for the proper voltages that should be coming from the sensors. If you have replaced all them, then it could indeed be the PCM or a wiring issue between the sensors and PCM. Might try unplugging and plugging back in all sensor connections and PCM connections, maybe some corrosion interferring with signals.
#7
When you get multiple sensor low voltage codes I have to wonder if the reference voltage is there. Might check at each connector - 117 engine temp sensor, 137 upstream O2 sensor and 1493 bat temp sensor. The battery temp sensor is either on the battery tray or built into the PCM. For the later you're SOL. The PCM supplies it but that circuit powers several additional sensors.