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Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> On-Board Diagnostic - Start Stop Unit >> DTC P0850-24; Transaxle Range Sensor Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

DTC P0850-24; TRANSAXLE RANGE SENSOR CIRCUIT MALFUNCTION DIAGNOSTIC PROCEDURE

Step Inspection Action
1 VERIFY TCM DTCs Yes Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (FW6A-EL, FW6AX-EL)] .)
No Go to the next step.
2 INSPECT START STOP UNIT CONNECTOR CONDITION
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • 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 6.
3 INSPECT TCM CONNECTOR CONDITION
  • 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 6.
4 INSPECT FOR SHORT TO POWER SUPPLY IN TRANSAXLE RANGE SENSOR CIRCUIT
  • Always reconnect all disconnected connectors.
  • Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Operate the selector lever to P or N position.
  • Measure the voltage at the start stop unit terminal 1F (wiring harness-side).
  • Is the voltage 1.0 V or less?
Yes Go to the next step.
No Refer to the wiring diagram and verify whether or not there is a common connector between start stop unit terminal 1F and TCM terminal J.
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 power supply.
  • Repair or replace the malfunctioning part.

If there is no common connector:
  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 6.
5 PERFORM DTC INSPECTION AND VERIFY TRANSAXLE RANGE SENSOR MALFUNCTION
  • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT] .)
  • Switch the ignition ON (engine off).
  • Perform the following work 5 times 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 and wait for 1 s or more.
      • Operate the selector lever to P or N position.
  • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT] .)
  • Is the same DTC displayed?
Yes Replace the TCM, then Go to the next step.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [FW6A-EL, FW6AX-EL].)
No Go to Step 7.
6 VERIFY THAT REPAIRS HAVE BEEN COMPLETED
  • Always reconnect all disconnected connectors.
  • Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • Clear the DTC for the start stop unit using the M-MDS. (See CLEARING DTC [START STOP UNIT] .)
  • Switch the ignition ON (engine off).
  • Perform the following work 5 times 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 and wait for 1 s or more.
      • Operate the selector lever to P or N position.
  • Retrieve the start stop unit DTCs using the M-MDS. (See DTC INSPECTION [START STOP UNIT] .)
  • Is the same DTC displayed?
Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
7 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.