LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2017 >> CX-5 Grand Select, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (On-Board Diagnostic - Engine Control (3 Of 5)) >> DTC P0482; Pcm Cooling Fan Relay No. 2 And No. 3 Control Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC POROCEDURE

STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION AVAILABILITY
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
2 INSPECT COOLING FAN RELAY NO. 2 AND NO. 3
  • Switch the ignition off.
  • Remove the cooling fan relay No. 2 and No. 3.
  • Inspect the cooling fan relay No. 2 and No. 3. (See RELAY INSPECTION .)
  • Is there any malfunction?
 Yes Replace the cooling fan relay No. 2 and/or No. 3, then go to Step 8.
No Go to the next step.
3 INSPECT COOLING FAN RELAY NO. 2 AND NO. 3 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT
  • Cooling fan relay No. 2 and No. 3 are removed.
  • Switch the ignition ON (engine off).
  • Measure the voltage at the following terminals (wiring harness-side):
    • Cooling fan relay No. 2 terminal A
      • Cooling fan relay No. 3 terminal A
  • Is the voltage B+?
 Yes Go to the next step.
No Inspect the ENGINE3 15 A fuse.
  • If the fuse is blown:
    • Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • ENGINE3 15 A fuse-Cooling fan relay No. 2 terminal A
    • ENGINE3 15 A fuse-Cooling fan relay No. 3 terminal A

    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.
    • Replace the fuse.
    • If the fuse is damaged:
      • Replace the fuse.
      • If the fuse is normal:
        • Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
    • Main relay terminal D-Cooling fan relay No. 2 terminal A
      • Main relay terminal D-Cooling fan relay No. 3 terminal A

    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 8.
4 INSPECT COOLING FAN RELAY NO. 2 AND NO. 3 SIGNAL CIRCUIT FOR SHORT TO GROUND
  • Cooling fan relay No. 2 and No. 3 are removed.
  • Switch the ignition off.
  • Inspect for continuity between the following terminals (wiring harness-side) and body ground:
    • Cooling fan relay No. 2 terminal E
      • Cooling fan relay No. 3 terminal E
  • Is there continuity?
 Yes If the short to ground circuit could be detected in the wiring harness:
  • Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
    • Cooling fan relay No. 2 terminal E-PCM terminal 2AV
      • Cooling fan relay No. 3 terminal E-PCM terminal 2AV

    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.

    If the short to ground circuit could not be detected in the wiring harness:

  • Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)

    Go to Step 8.
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 8.
No Go to the next step.
6 INSPECT COOLING FAN RELAY NO. 2 AND NO. 3 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
  • Cooling fan relay No. 2 and No. 3 are removed.
  • Verify that the PCM connector is 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):
    • Cooling fan relay No. 2 terminal E
      • Cooling fan relay No. 3 terminal E
  • Is the voltage 0 V?
 Yes Go to the next step.
No If there is no common connector:
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
  • Cooling fan relay No. 2 terminal E-PCM terminal 2AV
  • Cooling fan relay No. 3 terminal E-PCM terminal 2AV

    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.
  • Repair or replace the wiring harness which has a short to power supply.

Go to Step 8.
7 INSPECT COOLING FAN RELAY NO. 2 AND NO. 3 SIGNAL CIRCUIT FOR OPEN CIRCUIT
  • Cooling fan relay No. 2 and No. 3 are removed.
  • Verify that the PCM connector is disconnected.
  • Switch the ignition off.
  • Inspect for continuity between the following terminals (wiring harness-side):
    • Cooling fan relay No. 2 terminal E-PCM terminal 2AV
      • Cooling fan relay No. 3 terminal E-PCM terminal 2AV
  • 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:
  • Cooling fan relay No. 2 terminal E-PCM terminal 2AV
  • Cooling fan relay No. 3 terminal E-PCM terminal 2AV

    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 the next step.
8 VERIFY DTC TROUBLESHOOTING COMPLETED Yes Repeat the inspection from Step 1.
Go to the next step.
No Go to the next step.
9 VERIFY AFTER REPAIR PROCEDURE Yes Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .)
No DTC troubleshooting completed.
scientia non olet · About LEMON Manuals