PINPOINT TEST AA : The ATCM Does Not Respond To The Scan Tool
NOTE:
Failure to disconnect the battery when instructed will result in false resistance readings. REFER to Battery, Mounting and Cables
- AA1 CHECK THE ATCM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: ATCM.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C3639-1 Ground
Are the voltages greater than 11 volts?
Yes GO to AA2. No VERIFY the BCM fuse 35 (5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short. - AA2 CHECK THE ATCM GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure:
Positive Lead Measurement / Action Negative Lead C3639-7 Ground
Is the resistance less than 3 ohms?
Yes GO to AA3. No REPAIR the circuit in question. - AA3 CHECK THE HS-CAN CIRCUITS BETWEEN THE ATCM AND THE DLC FOR AN OPEN
Are the resistances less than 3 ohms?
Yes CONNECT the negative battery cable. GO to AA4. No REPAIR the circuit in question. - AA4 CHECK FOR CORRECT ATCM OPERATION
- Ignition OFF.
- Disconnect and inspect the ATCM connector and related in-line connectors.
- Repair:
- corrosion (replace connector or terminals - clean module pins)
- damaged or bent pins - replace terminals/pins
- pushed-out pins - replace pins as necessary
- Reconnect the ATCM connector and related in-line connectors. Make sure they seat and latch correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs address this concern, INSTALL a new ATCM. REFER to Four Wheel Drive (4WD) Systems . No The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
