DTC P0850:23 [START STOP UNIT]

id0902p6023200


Except MZR 1.6

Description

Transaxle range sensor circuit malfunction
Detection condition
•  Start stop unit detects that the transaxle range sensor signal is P or N position for 1 s or more continuously for a continuous 5 times or more even though the TCM CAN signal is other than P and N position with the ignition switched ON (engine off or on).
Fail-safe function
•  Perform control of the internal signal for control of the transaxle range sensor as position other than P, N positions.
Possible cause
•  DTCs are stored in the TCM.
•  DTCs are stored in the PCM.
•  TCM connector or terminal malfunction
•  PCM connector or terminal malfunction
•  Start stop unit connector or terminal malfunction
•  Short to ground in the wiring harness between the following terminals:
―  TCM terminal J—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)
―  TCM terminal J—PCM terminal 2N (SKYACTIV-D 1.5)
―  TCM terminal J—PCM terminal 2AI (SKYACTIV-D 2.2)
―  TCM terminal J—Start stop unit terminal 1F
•  Open circuit in wiring harness between the following terminals:
―  TCM terminal J—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)
―  TCM terminal J—PCM terminal 2N (SKYACTIV-D 1.5)
―  TCM terminal J—PCM terminal 2AI (SKYACTIV-D 2.2)
―  TCM terminal J—Start stop unit terminal 1F
•  Transaxle range sensor malfunction
•  PCM malfunction
•  Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY TCM DTCs
•  Retrieve the TCM DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [GW6A-EL].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [CW6A-EL].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [EW6A-EL].)
No
Go to the next step.
2
VERIFY PCM DTCs
•  Retrieve the PCM DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
(See DTC TABLE [SKYACTIV-D 1.5].)
(See DTC TABLE [SKYACTIV-D 2.2].)
No
Go to the next step.
3
INSPECT TCM CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the TCM connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 10.
4
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 10.
5
INSPECT START STOP UNIT CONNECTOR CONDITION
•  Disconnect the start stop unit connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 10.
6
INSPECT FOR SHORT TO GROUND IN TRANSAXLE RANGE SENSOR CIRCUIT
•  Verify that the start stop unit, PCM and TCM connectors are disconnected.
•  Inspect for continuity between start stop unit terminal 1F (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  TCM terminal J—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)
•  TCM terminal J—PCM terminal 2N (SKYACTIV-D 1.5)
•  TCM terminal J—PCM terminal 2AI (SKYACTIV-D 2.2)
•  TCM terminal J—Start stop unit terminal 1F
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 10.
No
Go to the next step.
7
INSPECT FOR OPEN CIRCUIT IN TRANSAXLE RANGE SENSOR CIRCUIT
•  Verify that the start stop unit, PCM and TCM connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  TCM terminal J—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)
―  TCM terminal J—PCM terminal 2N (SKYACTIV-D 1.5)
―  TCM terminal J—PCM terminal 2AI (SKYACTIV-D 2.2)
―  TCM terminal J—Start stop unit terminal 1F
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  TCM terminal J—PCM terminal 2BD (SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5)
•  TCM terminal J—PCM terminal 2N (SKYACTIV-D 1.5)
•  TCM terminal J—PCM terminal 2AI (SKYACTIV-D 2.2)
•  TCM terminal J—Start stop unit terminal 1F
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 10.
8
PERFORM DTC INSPECTION AND VERIFY TRANSAXLE RANGE SENSOR MALFUNCTION
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the start stop unit using the M-MDS.
•  Switch the ignition ON (engine off).
•  Perform the following work 5 times or more.
―  Operate the selector lever to other than P and N position and wait for 1 s or more.
―  Operate the selector lever to P or N position and wait for 1 s or more.
―  Operate the selector lever to other than P and N position.
•  Retrieve the start stop unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the TCM, then go to the next step.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [FW6A-EL].)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [GW6A-EL].)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [CW6A-EL].)
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [EW6A-EL].)
No
Go to Step 11.
9
PERFORM DTC INSPECTION AND VERIFY PCM MALFUNCTION
•  Clear the DTC for the start stop unit using the M-MDS.
•  Switch the ignition ON (engine off).
•  Perform the following work 5 times or more.
―  Operate the selector lever to other than P and N position and wait for 1 s or more.
―  Operate the selector lever to P or N position and wait for 1 s or more.
―  Operate the selector lever to other than P and N position.
•  Retrieve the start stop unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
No
Go to Step 11.
10
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the start stop unit using the M-MDS.
•  Switch the ignition ON (engine off).
•  Perform the following work 5 times or more.
―  Operate the selector lever to other than P and N position and wait for 1 s or more.
―  Operate the selector lever to P or N position and wait for 1 s or more.
―  Operate the selector lever to other than P and N position.
•  Retrieve the start stop unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the start stop unit.
Go to the next step.
No
Go to the next step.
11
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [START STOP UNIT].)
No
DTC troubleshooting completed.


MZR 1.6

Description

Transaxle range switch circuit malfunction
Detection condition
•  Start stop unit detects that the transaxle range switch signal is P or N position for 1 s or more continuously for a continuous 5 times or more even though the TCM CAN signal is other than P and N position with the ignition switched ON (engine off or on).
Fail-safe function
•  Perform control of the internal signal for control of the transaxle range switch as position other than P, N positions.
Possible cause
•  DTCs are stored in the TCM.
•  DTCs are stored in the PCM.
•  Transaxle range switch connector or terminal malfunction
•  PCM connector or terminal malfunction
•  Start stop unit connector or terminal malfunction
•  Short to ground in the wiring harness between the following terminals:
―  Transaxle range switch terminal A—PCM terminal 1V
―  Transaxle range switch terminal A—Start stop unit terminal 1F
•  Transaxle range switch malfunction
•  PCM malfunction
•  Start stop unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY TCM DTCs
•  Retrieve the TCM DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FN4A-EL].)
No
Go to the next step.
2
VERIFY PCM DTCs
•  Retrieve the PCM DTCs using the M-MDS.
•  Are any DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [MZR 1.6].)
No
Go to the next step.
3
INSPECT TRANSAXLE RANGE SWITCH CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the transaxle range switch connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 9.
4
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 9.
5
INSPECT START STOP UNIT CONNECTOR CONDITION
•  Disconnect the start stop unit connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 9.
6
INSPECT FOR SHORT TO GROUND IN TRANSAXLE RANGE SWITCH CIRCUIT
•  Verify that the start stop unit, PCM and transaxle range switch connectors are disconnected.
•  Inspect for continuity between start stop unit terminal 1F (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Transaxle range switch terminal A—PCM terminal 1V
•  Transaxle range switch terminal A—Start stop unit terminal 1F
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 9.
No
Go to the next step.
7
INSPECT TRANSAXLE RANGE SWITCH
•  Inspect the transaxle range switch.
•  Is the transaxle range switch normal?
Yes
Go to the next step.
No
Replace the transaxle range switch, then go to Step 9.
(See TRANSAXLE RANGE (TR) SWITCH REMOVAL/INSTALLATION [FN4A-EL].)
8
PERFORM DTC INSPECTION AND VERIFY PCM MALFUNCTION
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the start stop unit using the M-MDS.
•  Switch the ignition ON (engine off).
•  Perform the following work 5 times or more.
―  Operate the selector lever to other than P and N position and wait for 1 s or more.
―  Operate the selector lever to P or N position and wait for 1 s or more.
―  Operate the selector lever to other than P and N position.
•  Retrieve the start stop unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZR 1.6].)
No
Go to Step 10.
9
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery cable.
•  Clear the DTC for the start stop unit using the M-MDS.
•  Switch the ignition ON (engine off).
•  Perform the following work 5 times or more.
―  Operate the selector lever to other than P and N position and wait for 1 s or more.
―  Operate the selector lever to P or N position and wait for 1 s or more.
―  Operate the selector lever to other than P and N position.
•  Retrieve the start stop unit DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the start stop unit.
Go to the next step.
No
Go to the next step.
10
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [START STOP UNIT].)
No
DTC troubleshooting completed.