DTC B2975 [MZ-CD 1.6 (Y6)]


B3E090200200W08

DTC B2975

PTC heater line overload

DETECTION CONDITION

Short to power supply in wiring harness between PJB and PTC heater

POSSIBLE CAUSE

• Short to power supply in wiring harness between PJB terminal J-04 A and PTC heater terminal 2B
• PTC heater malfunction
• PJB malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT PTC HEATER CONNECTOR
• Turn the ignition switch off.
• Disconnect the PTC heater connector.
• Inspect the PTC heater connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 4.
No
Go to the next step.
2
INSPECT PJB CONNECTOR
• Disconnect the PJB connector.
• Inspect the PJB connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 4.
No
Go to the next step.
3
INSPECT PTC HEATER SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position (Engine off).
• Measure the voltage between PJB terminal J-04 A (wiring harness-side) and body GND.
• Is the voltage B+?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to the next step.
No
Replace the PTC heater, then go to the next step.
4
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PJB memory using the WDS or equivalent.
• Turn the ignition switch off then ON.
• Is the same DTC present?
Yes
Replace the PJB.
No
DTC troubleshooting completed.