I am getting code P1296 on handheld scanner on my 2001 grand Cherokee Limited 4.7,V8. Tells me 5v TPS is failing or not present. I changed 2 forward left & right coils and injectors(brand new). How do I correct the TPS voltage problem. SUV turns on but then goes off, it also hesitating & sputters. Please help , thank you.
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2001 Jeep Grand Cherokee Question: code P1296 on handheld scanner
Answer #1lightsaber July 27, 2013, 08:46Technician
My Haynes manual indicates p1296 = no 5 volts to MAP sensor, whereas p1295 = no 5 volts to the tps. 5 volts originates from the pcm. First off though check the battery voltage, charging voltage and fuses/relays. Check the terminals on the TPS, MAP connectors for widening from age as the pig tail connectors also go bad. Check voltage at tps while connected by back-probing. If I remember correctly, the center is the signal and the two outer wires are 5 volts and ground. If the voltage is very close to +5v, then you likely have a bad tps/map or connector. If you do not have 5v, then you should have the pcm checked. You should also remove and clean the (IAC) intake air control valve and passage on the throttle body. Keep in mind the IAC is easily damaged, so clean carefully.
ReplyRay I, August 01, 2013, 12:11Rookie
Thank you lightsaber for your time and effort in answering my cry for help. I have checked the battery voltage, alternator, charging capacity, fuses/relays, replaced (2) forward -left and right injectors together with coils and plugs appearing to be part of the problem. Also replaced the TPS Sensor. This is a 2001 Grand Cherokee Limited 4.7 V8. I measured voltage at 5.16 inside connector. Remove and cleaned the(IAC)intake air control valve and passage on throttle body carefully. I have not checked the (PCM) or crank sensor as someone suggested. Codes coming up on dash are P0505, P0123,P138, P1296, P1687. Can't figure it out. Gonna have to buy a Scanner, Ray.
Replylightsaber, August 01, 2013, 14:33Technician
The third code in your list is P138, but if that is really supposed to be P0138 then the following applies: P0138 (M) 1/2 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range. That appears to be a shorted oxygen sensor bank 1 sensor 2. Replace the B1S2 oxygen sensor and then check all fuses again to see if the shorted O2 sensor had caused a fuse to blow as well as your other codes. The other possibility is that the wiring to the O2 sensor is shorted like on the exhaust, etc.