I did some research for you and found what the code is. I don't know if you want to read it, but here is cause with diagnostics. NOTE: I want you to pay attention to the last sentence.
P1492-AMBIENT/BATTERY TEMP SENSOR VOLTAGE TOO HIGH
When Monitored: With the ignition key on.
Set Condition: The PCM senses the voltage from the Battery Temperature Sensor above
4.9 volts for 3 seconds.
POSSIBLE CAUSES
BATTERY TEMP SENSOR VOLTAGE ABOVE 4.8 VOLTS
BATTERY TEMPERATURE SENSOR
(K118) BATTERY TEMP SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K118) BATTERY TEMP SIGNAL CIRCUIT OPEN
(K4) SENSOR GROUND CIRCUIT OPEN
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
Record all DTCs and the related Freeze Frame data.
Check for any related TSBs.
With the DRBIIIt, monitor the Battery Temperature Sensor voltage.
Is the voltage above 4.8 volts?
All
Yes ! Go To 2
No ! Refer to the INTERMITTENT CONDITION Symptom (Diagnostic
Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 3.
2 Turn the ignition off.
Disconnect the Battery Temp Sensor harness connector.
Ignition on, engine not running.
With the DRBIIIt, read the Ambient/Batt Tmp Vlt value.
Connect a jumper wire between the (K118) Battery Temp Signal circuit and the (K4)
Sensor ground circuit at the Sensor harness connector.
Did the Battery Temp Sensor voltage change from greater than 4.5 volts to less than
1.0 volt?
All
Yes ! Replace the Battery Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No ! Go To 3
NOTE: Remove the jumper wire before continuing.
TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (K118) Battery Temp Signal circuit at the Sensor harness
connector.
Is the voltage above 5.2 volts?
All
Yes ! Repair the short to voltage in the (K118) Battery Temp Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No ! Go To 4
4 Turn the ignition off.
Measure the resistance of the (K118) Battery Temp Signal circuit from the Battery
Temp Sensor harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes ! Go To 5
No ! Repair the open in the (K118) Battery Temp Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
5 Measure the resistance in the (K4) Sensor ground circuit from the PCM harness
connector to the Sensor connector.
Is the resistance below 5.0 ohms?
All
Yes ! Go To 6
No ! Repair the open in the (K4) Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
6 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
I would remove the battery and check that sensor wiring underneath it. Chances are a wire came off or something foolish.
Let me know what you find or if you have other questions.
Joe
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Saturday, May 22nd, 2010 AT 10:11 PM
