P0885

DTC P0885 A/T RELAY CIRCUIT MALFUNCTION





COMPONENT LOCATION

GENERAL DESCRIPTION
The HIVEC Automatic Transmission supplies the power to the solenoid valves by way of a control relay. When the TCM sets the relay to ON, the relay operates and the battery power is supplied to all the solenoid valves. When the TCM sets the relay to OFF, all solenoid valve power is shut off and the transmission is held in the 3rd gear position. (Fail Safe Mode)

DTC DESCRIPTION
The TCM checks the A/T control relay signal by monitoring the control signal. If, after the ignition key is turned on, an unexpected voltage value, which is quite a bit lower than battery voltage is detected, the TCM sets this code.

DTC DETECTING CONDITION





[2.0L]





[2.7L]

MONITOR SCANTOOL DATA
1. Connect scantool to data link connector (DLC).
2. Ignition"ON" & Engine"OFF".





3. Monitor the "A/T CON. RELAY VOLT" parameter on the scantool.
Specification: Approximately B+
4. Is A/T RELAY VOLT within specifications?
YES >>
^ Fault is intermittent caused by poor contact in the sensor's and/or TCM (PCM)'s connector or was repaired and TCM (PCM) memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to "Verification Vehicle Repair" procedure.
NO >>
^ Go to "Terminal & Connector Inspection" procedure.

TERMINAL & CONNECTOR INSPECTION
Refer to DTC P0750. P0750

POWER SUPPLY CIRCUIT INSPECTION
1. Ignition "ON" & Engine "OFF".
2. Disconnect the "A/T CONTROL RELAY" connector.





3. Measure the voltage between terminal "1" of the "A/T CONTROL RELAY" harness connector and chassis ground.
Specification: Approximately B+
4. Is voltage within specifications?
YES >>
^ Go to "Signal circuit inspection" procedure.
NO >>
^ Check that A/T-30A Fuse in engine room junction is installed or not blown. Check for Open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure.

SIGNAL CIRCUIT INSPECTION
1. CHECK A/T control relay harness
1. Ignition "OFF".
2. Disconnect the "A/T CONTROL RELAY" connector.
3. Measure the voltage between terminal "4" of the "A/T CONTROL RELAY" harness connector and chassis ground.





4. Turn ignition switch OFF -> ON.
Specification: 12V is measured only for approximately 0.5 sec.
5. Is voltage within specifications?
YES >>
^ Go to "Check Supplying Power to solenoid valve" procedure.
NO >>
^ Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
^ If signal circuit is OK, Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM and then go to "Verification of Vehicle Repair" procedure.

2. CHECK Supplying Power to solenoid valve harness
1. Ignition "OFF".
2. Disconnect the "A/T CONTROL RELAY" and PCM/TCM connector.





3. Measure the resistance between terminal "3" of the "A/T CONTROL RELAY" harness connector and terminal "32, 36" of the PCM/TCM harness connector.
Specification: Approximately 0 Ohms
4. Is resistance within specifications?
YES >>
^ Go to "Ground circuit inspection" procedure.
NO >>
^ Check for Open in C-41 joint connector.
^ Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure.

GROUND CIRCUIT INSPECTION
1. Ignition "OFF".
2. Connect the "A/T CONTROL RELAY" connector.





3. Measure the resistance between terminal "2" of the "A/T CONTROL RELAY" harness connector and chassis ground.
Specification: Approximately 0 Ohms
4. Is resistance within specifications?
YES >>
^ Go to "Component inspection" procedure.
NO >>
^ Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure.

COMPONENT INSPECTION
1. Ignition "OFF".
2. Remove "A/T CONTROL RELAY"





3. Measure the resistance between each terminal of the sensor.
Specification:
4. Is resistance with in specification?
YES >>
^ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO >>
^ Replace ATM CONTROL RELAY and then go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
Refer to DTC P0560. P0560