DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 26 / 284

Symptom List:
P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE
TOO HIGH
P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE
TOO LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0070-AMBIENT AIR TEMPER-
ATURE CIRCUIT SIGNAL VOLTAGE TOO HIGH.
When Monitored and Set Condition:
P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE TOO HIGH
When Monitored: With the ignition on.
Set Condition: When the BCM detects high voltage on the Ambient Air Temperature
Sensor Signal circuit, a J1850 Bus message is sent to the ECM to set this DTC.
P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE TOO LOW
When Monitored: With the ignition on.
Set Condition: When the BCM detects low voltage on the Ambient Air Temperature
Sensor Signal circuit, a J1850 Bus message is sent to the ECM to set this DTC.
POSSIBLE CAUSES
REFER TO COMPASS/MINI TRIP COMPUTER SYMPTOM
INTERMITTENT CONDITION
TEST ACTION APPLICABILITY
1 NOTE: The Ambient Air Temperature Sensor is hardwired to the Body
Control Module (BCM). The Ambient Air Temperature Circuit DTCs are set
in the ECM via the J1850 Bus by the BCM.
Turn the ignition on.
With the DRBIII
t
, erase the ECM DTCs.
Cycle the ignition switch from OFF to ON.
Monitor the DRBIII
t
for ECM DTCs.
Does the DRBIII
t
display this DTC?
All
Yes
→
Refer to symptom *TEMPERATURE DISPLAY INACCURATE
OR INOPERATIVE in the Overhead Console category in the Body
Diagnostic Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 2
18
DRIVEABILITY - DIESEL
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