joshua smith

on my 2004.5 I just got the code P0071, It says that the PCM has determined that the voltage signal from the ambient air temp. sensor is out of rang for the current engine operating conditions. I dont understand? Help?

vzdude

No bigee! Take it to the dealer for a reflash if you are under warranty. There are several codes that may show up for basically no reason.

joshua smith

ok, but what is the ambient air temp sensor? I went camping last weekend and didnt drive the truck again until today and thats when it came on. I live at 4200ft and I was as high as 8000, would that cause it to come on? not under warranty, 130,000 miles

vzdude

Here is the TSB. It is a little long so I'll just put the pertinant info on . I wont post the instructions. ( you can't do it without the dealer equipment anyhow)

THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 18-022-06 DATED
JULY 13, 2006, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS
ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE THE ADDITION OF DTC
P0191 - FUEL RAIL PRESSURE SENSOR CIRCUIT PERFORMANCE.
THE DRBIIIŽ FLASH FILES FOR THIS BULLETIN ARE AVAILABLE ON
DealerCONNECT.
SUBJECT:
Flash: 5.9L Turbo-Diesel Engine System Enhancements
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Engine Control Module
(ECM) with new software.
MODELS:
2003 - 2005 (DR / DH) Ram Truck
NOTE: This bulletin applies to vehicles equipped with a 5.9L turbo diesel engine
(sales codes ETC and ETH respectively).
SYMPTOM/CONDITION:
The following enhancements are included with this software:
1. Improved engine cooling (radiator fan activation) and prevention of possible engine
overheat. When coolant temperature faults are present the radiator fan is enabled
(turned on) during vehicle operation.
2. Correction to oil pressure reading when engine is operating at higher engine
temperatures above 91°C (195°F).
3. Improvement to the Temperature Sensor Rationality Test to prevent possible false test
failures and the following related Diagnostic Trouble Codes (DTC's):
a. DTC P0071 - Inlet Air Temperature Sensor Rationality.
b. DTC P0111 - Intake Air Temperature (IAT) Sensor Rationality.
c. DTC P0514 - Battery Temperature Sensor Rationality.
4. Additional Water-In-Fuel (WIF) warning added to indicate that the operator has had a
WIF DTC P2269 and has continued to operate (drive) the vehicle in excess of 500
miles without draining the water from the fuel filter. The following is the new WIF DTC
that has been added:
a. DTC P0169 - WIF Too Long Error
NUMBER: 18-022-07
GROUP: Vehicle Performance
DATE: March 14, 2007
5. ** Improvement to the Fuel Pressure Rationality Test to prevent possible false test
failures and the following related Diagnostic Trouble Code:
a. DTC P0191 - Fuel Rail Pressure Sensor Circuit Performance (2004.5 to 2005 M.Y.
vehicles). **
DIAGNOSIS:
Using a Scan Tool (DRBIIIŽ) with the appropriate Diagnostic Procedures available in
TechCONNECT, verify all engine systems are functioning as designed. If DTCs are
present record them on the repair order and repair as necessary before proceeding further
with this bulletin.
If the vehicle operator describes or experiences the Symptom/Condition, perform the
Repair Procedure.

joshua smith

thanks, I apprecitate it. Ill take it in monday. thanks again