How to Check Code P0880 TCM Power Signal Error Open/Short (GRD)
Component Location
Auto repair and Study guide 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 )
Auto repair and Study guide DTC Description
Study guide The TCM checks the A/T control relay signal by monitoring the contol signal. If, after the iginiton 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
Auto repair and Study guide
Detecting Condition
Possible Cause
• Check voltage range
• Open or short in circuit
• Faulty A/T control relay
• Faulty PCM/TCM
Enable Conditions Study guide
• 22V Voltage Battery 9V
• Time after TCM turns on 0.5sec
Threshold Value
• Voltage 7V or Voltage 24.5V
How to check Code P0880 TCM Power Signal Error Open/Short (GND)
Auto repair and Study guide 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: Approx. B+
4. Is A/T RELAY VOLT within specifications?
▶ 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.Study guide Throughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.Repair or replace as necessary and go to Auto repair "Verification Vehicle Repair" procedure.
▶ Go to "W/Harness Inspection" procedure.
How to check Code P0880 TCM Power Signal Error Open/Short (GND)
Auto repair and Study guide Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
▶ Repair as necessary and go to Auto repair "Verification vehicle Repair" procedure
▶ Go to Auto repair "Power Circuit Inspection" procedure
Study guide Power 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: Approx. B+
4. Is voltage within specifications?
▶ Go to Auto repair "Signal Circuit Inspection" procedure
▶ Check that A/T-20A 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 and Study guide.
Auto repair and Study guide Signal Circuit Inspection
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 approx. 0.5sec
5. Is resistance within specifications?
▶ Go to "Check Supplying Power to solenoid valve" procedure
▶ 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.
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 "49, 50" of the PCM/TCM harness connector
Specification: Approx. 0 Ω
4. Is resistance within specifications?
▶ Go to "Ground Circuit Inspection" procedure
▶ Check that A/T-20A 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
Auto repair And Study guide 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 : Approx. 0 Ω
4. Is resistance within specifications?
▶ Go to "Component Inspection" procedure
▶ Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
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