#
DTC P0537

id010200870200

DTC P0537 | Evaporator temperature sensor circuit low input
--- | ---
DETECTION CONDITION | • The PCM monitors the evaporator temperature sensor signal at PCM terminal 1AD. If the PCM detects that the evaporator temperature sensor voltage is 0.07 V or less, the PCM determines that the evaporator temperature sensor circuit has a malfunction. Diagnostic support note • This is continuous monitor (other). • The MIL does not illuminate. • The PENDING CODE is available if the PCM detects the above malfunction condition. • The FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE | • Evaporator temperature sensor malfunction • Short in to ground circuit between evaporator temperature sensor terminal B and PCM terminal 1AD • Short each wiring harness evaporator temperature signal circuit and evaporator temperature ground circuit • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is the same DTC present? | Yes | Go to the next step.
No | Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING.)
2 | INSPECT EVAPORATOR TEMPERATURE SENSOR TERMINAL • Turn the ignition switch off. • Disconnect the evaporator temperature sensor connector. • Inspect for a bent terminal in the evaporator temperature sensor terminals A and B (part-side). • Is there any malfunction? | Yes | Repair or replace the terminal, then go to Step 6.
No | Go to the next step.
3 | CLASSIFY EVAPORATOR TEMPERATURE SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION • Connect the WDS or equivalent to the DLC-2. • Access the A/CT V PID. • Verify the A/CT V value when disconnecting evaporator temperature sensor connector. • Does the A/CT V value change? | Yes | Replace the evaporator temperature sensor, then go to Step 6.
No | Go to the next step.
4 | INSPECT EVAPORATOR TEMPERATURE SIGNAL CIRCUIT FOR SHORT TO GROUND • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for continuity between evaporator temperature sensor terminal B (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness for short to ground, then go to Step 6.
No | Go to the next step.
5 | INSPECT EVAPORATOR TEMPERATURE CIRCUITS FOR SHORT • Inspect for continuity between evaporator temperature sensor terminals (wiring harness-side) A and B. • Is there continuity? | Yes | Repair or replace the wiring harness for short, then go to Step 6.
No | Go to the next step.
6 | VERIFY TROUBLESHOOTING OF DTC P0537 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the KOEO/KOER self-test. (See KOEO/KOER SELF-TEST.) • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
No | Go to the next step.
7 | VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present? | Yes | Go to applicable DTC troubleshooting. (See DTC TABLE.)
No | Troubleshooting completed.