Dodge Dakota (R1). Manual — part 822
Symptom:
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH
When Monitored and Set Condition:
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH
When Monitored:
With the ignition key on.
Set Condition:
The PCM senses the voltage from the AMBIENT/BATT temperature
sensor to be above 4.9 volts for 3 seconds.
POSSIBLE CAUSES
SENSOR GROUND CIRCUIT OPEN
AMBIENT/BATT SIGNAL CIRCUIT OPEN
AMBIENT/BATT SIGNAL CIRCUIT SHORTED TO VOLTAGE
AMBIENT/BATT TEMPERATURE SENSOR
PCM
WIRING HARNESS INTERMITTENT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the DTC Good Trip Counter displayed and equal to zero for P1492?
All
Yes
→
No
→
2
Turn the ignition off. Disconnect the AMBIENT/BATT Temperature Sensor harness
connector.
Measure the resistance between the Sensor Ground circuit and ground at the
AMBIENT/BATT Temperature Sensor connector.
Is the resistance below 5.0 ohms?
All
No
→
Repair the open Sensor Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
Yes
→
3
Turn the ignition off. Disconnect the AMBIENT/BATT harness connector. Disconnect
the PCM harness connector(s).
Measure the resistance of the AMBIENT/BATT Signal circuit from the AMBIENT/
BATT harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
No
→
Repair the open circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
Yes
→
20
CHARGING
TEST
ACTION
APPLICABILITY
4
Turn the ignition off. Disconnect the AMBIENT/BATT harness connector. Start the
engine. Allow engine to idle.
Measure the AMBIENT/BATT Signal circuit voltage at the AMBIENT/BATT harness
connector.
Is the voltage above 5.5 volts?
All
Yes
→
Repair the short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
5
Turn the ignition off. Disconnect the AMBIENT/BATT Temperature Sensor connec-
tor. Turn the ignition on.
With the DRBIII
t in sensors, read the 9Ambient/Bat Tmp Vlt9 value. Connect a
jumper wire between the AMB/BATT Signal circuit and the Sensor Ground circuit at
the AMB\BATT connector. Voltage should change from greater than 4.5 volts to less
than 1.0 volt.
Did the
9Ambient/Bat Tmp Vlt9 value change from greater than 4.5 volts to less than
1.0 volt?
All
Yes
→
Replace the AMBIENT/BATT Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
6
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module Module in
accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
7
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Test Complete.
21
CHARGING
P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH —
Continued
Symptom:
P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW
When Monitored and Set Condition:
P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW
When Monitored:
With the ignition on.
Set Condition:
The PCM senses the voltage from the AMBIENT/BATT temperature
sensor to be below 0.5 volt for 3 seconds.
POSSIBLE CAUSES
AMBIENT/BATT TEMP SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIR-
CUIT
AMBIENT/BATT TEMPERATURE SIGNAL CIRCUIT SHORTED TO GROUND
AMBIENT/BATT TEMPERATURE SENSOR
PCM
WIRING HARNESS INTERMITTENT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTC’s.
Is the DTC Specific Good Trip Counter displayed and equal to zero for P1493?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRBIII
t in sensors, read the 9Ambient/Bat TMP VLT9 value. Disconnect the
AMBIENT/BATT Temperature Sensor harness connector.
Did the
9Ambient/Bat Tmp Vlt9 value change from below 1.0 volt to above 4.5 volts?
All
Yes
→
Replace the AMBIENT/BATT Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
3
Turn the ignition off. Disconnect the AMBIENT/BATT harness connector. Disconnect
the PCM harness connector(s).
Measure the resistance of the AMBIENT/BATT temperature sensor Signal circuit
from the AMBIENT/BATT temp sensor harness connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
22
CHARGING
TEST
ACTION
APPLICABILITY
4
Turn the ignition off. Disconnect the AMBIENT/BATT temperature sensor harness
connector. Disconnect the PCM harness connectors.
Measure the resistance between the AMBIENT/BATT temperature sensor Signal
circuit and the Sensor Ground circuit at the AMBIENT/BATT temp sensor harness
connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the shorted circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
5
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
6
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any Technical Service Bulletins (TSB) that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Test Complete.
23
CHARGING
P1493-AMBIENT/BATT TEMP SEN VOLTS TOO LOW —
Continued
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