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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic - Engine Control (5 Of 5) >> DTC U063F-00: Communication Error Between Coolant Control Valve Position Sensor And Pcm >> Diagnostic Procedure

Diagnostic Procedure

DTC U063F:00 DIAGNOSTIC PROCEDURE

STEP INSPECTION RESULTS ACTION
1 RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION
NOTE:
  • Recording can be facilitated using the screen capture function of the PC.
  • Record the snapshot data on the repair order.
- Go to the next step.
2 VERIFY RELATED SERVICE INFORMATION AVAILABILITY
  • Verify related Service Information availability.
  • Is any related Service Information available?
Yes Perform repair or diagnosis according to the available Service Information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
3 VERIFY DTC FOR MODULE COMMUNICATION
  • Switch the ignition off, then ON (engine off).
  • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST .)
  • Are any other PENDING CODEs and/or DTCs present?
Yes Go to the applicable PENDING CODE or DTC inspection.
(See DTC TABLE .)
No Go to the next step.
4 INSPECT COOLANT CONTROL VALVE/COOLANT CONTROL VALVE POSITION SENSOR CONNECTOR CONDITION
  • Disconnect the coolant control valve/coolant control valve position sensor connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
Yes Repair or replace the connector and/or terminals, then go to Step 11.
No Go to the next step.
5 INSPECT PCM CONNECTOR CONDITION
  • Disconnect the PCM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
Yes Repair or replace the connector and/or terminals, then go to Step 11.
No Go to the next step.
6 INSPECT COOLANT CONTROL VALVE/COOLANT CONTROL VALVE POSITION SENSOR CIRCUIT FOR OPEN CIRCUIT
  • Verify that the coolant control valve/coolant control valve position sensor and PCM connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Coolant control valve/coolant control valve position sensor terminal C-PCM terminal 1D
    • Coolant control valve/coolant control valve position sensor terminal D-PCM terminal 1I
      • Coolant control valve/coolant control valve position sensor terminal E-PCM terminal 1BG
  • 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:
  • Coolant control valve/coolant control valve position sensor terminal C-PCM terminal 1D
  • Coolant control valve/coolant control valve position sensor terminal D-PCM terminal 1I
  • Coolant control valve/coolant control valve position sensor terminal E-PCM terminal 1BG

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 11.
7 INSPECT COOLANT CONTROL VALVE/COOLANT CONTROL VALVE POSITION SENSOR CIRCUIT FOR SHORT TO GROUND
  • Verify that the coolant control valve/coolant control valve position sensor and PCM connectors are disconnected.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Coolant control valve/coolant control valve position sensor terminal C-PCM terminal 1D
    • Coolant control valve/coolant control valve position sensor terminal D-PCM terminal 1I
      • Coolant control valve/coolant control valve position sensor terminal E-PCM terminal 1BG
  • Is there continuity?
Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Coolant control valve/coolant control valve position sensor terminal C-PCM terminal 1D
  • Coolant control valve/coolant control valve position sensor terminal D-PCM terminal 1I
  • Coolant control valve/coolant control valve position sensor terminal E-PCM terminal 1BG

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 11.
No Go to the next step.
8 INSPECT COOLANT CONTROL VALVE/COOLANT CONTROL VALVE POSITION SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
  • Verify that the coolant control valve/coolant control valve position sensor and PCM connectors are disconnected.
  • Switch the ignition ON (engine off).
    NOTE:
    • Another DTC may be stored by the PCM detecting an open circuit.
  • Measure the voltage at the following terminals (wiring harness-side):
    • Coolant control valve/coolant control valve position sensor terminal C-PCM terminal 1D
    • Coolant control valve/coolant control valve position sensor terminal D-PCM terminal 1I
      • Coolant control valve/coolant control valve position sensor terminal E-PCM terminal 1BG
  • Is the voltage 0 V?
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:
  • Coolant control valve/coolant control valve position sensor terminal C-PCM terminal 1D
  • Coolant control valve/coolant control valve position sensor terminal D-PCM terminal 1I
  • Coolant control valve/coolant control valve position sensor terminal E-PCM terminal 1BG

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 11.
9 INSPECT COOLANT CONTROL VALVE/COOLANT CONTROL VALVE POSITION SENSOR CIRCUITS FOR SHORT TO EACH OTHER
  • Verify that the coolant control valve/coolant control valve position sensor and PCM connectors are disconnected.
  • Inspect for continuity between coolant control valve/coolant control valve position sensor terminals C, D and E (wiring harness-side).
  • Is there continuity?
Yes Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Coolant control valve/coolant control valve position sensor terminal C-PCM terminal 1D
  • Coolant control valve/coolant control valve position sensor terminal D-PCM terminal 1I
  • Coolant control valve/coolant control valve position sensor terminal E-PCM terminal 1BG

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 each other.
  • Repair or replace the malfunctioning part.

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

Go to Step 11.
No Go to the next step.
10 INSPECT COOLANT CONTROL VALVE POSITION SENSOR Yes Replace the coolant control valve, then go to Step 11.
(See COOLANT CONTROL VALVE POSITION SENSOR REMOVAL/INSTALLATION .)
No Go to the next step.
11 VERIFY DTC TROUBLESHOOTING COMPLETED
  • Always reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC .)
  • Perform the KOEO or KOER self test. (See CLEARING DTC .)
  • Is the same DTC present?
Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
12 VERIFY AFTER REPAIR PROCEDURE Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No DTC troubleshooting completed.