DTC P0538:00 [ZJ, ZY]

id0102c0705300

DTC P0538:00

Evaporator temperature sensor circuit high input

DETECTION CONDITION

•  If the input voltage is 4.9 V or more for 16 s or more, the PCM determines that the evaporator temperature sensor circuit has a malfunction.

Diagnostic support note

•  This is continuous monitor (CCM).

•  The MIL does not illuminate.

•  FREEZE FRAME DATA is available.

•  The DTC is stored in the PCM memory.

POSSIBLE CAUSE

•  Evaporator temperature sensor connector or terminals malfunction

•  Evaporator temperature sensor malfunction

•  PCM connector or terminals malfunction

•  Short to power supply in wiring harness between evaporator temperature sensor terminal B and PCM terminal 1AW

•  Open circuit in wiring harness between the following terminals:

―  Evaporator temperature sensor terminal B and PCM terminal 1AW

―  Evaporator temperature sensor terminal A and PCM terminal 1AG

•  PCM malfunction

DTC P0538:00	Evaporator temperature sensor circuit high input
DETECTION CONDITION	• If the input voltage is 4.9 V or more for 16 s or more, the PCM determines that the evaporator temperature sensor circuit has a malfunction. Diagnostic support note • This is continuous monitor (CCM). • The MIL does not illuminate. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Evaporator temperature sensor connector or terminals malfunction • Evaporator temperature sensor malfunction • PCM connector or terminals malfunction • Short to power supply in wiring harness between evaporator temperature sensor terminal B and PCM terminal 1AW • Open circuit in wiring harness between the following terminals: ― Evaporator temperature sensor terminal B and PCM terminal 1AW ― Evaporator temperature sensor terminal A and PCM terminal 1AG • PCM malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has the FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then 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.
2		No	Go to the next step.
3	INSPECT EVAPORATOR TEMPERATURE SENSOR CONNECTOR AND TERMINALS • Turn the ignition switch off. • Disconnect the evaporator temperature sensor connector. • Inspect for poor connection (such as damaged/ pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 8.
3		No	Go to the next step.
4	CLASSIFY EVAPORATOR TEMPERATURE SENSOR MALFUNCTION OR WIRING HARNESS MALFUNCTION • Reconnect evaporator temperature sensor connector. • Connect the M-MDS to the DLC-2. • Perform the PID/DATA Monitor and Record Procedure and access the A/CT V PID. (See ON-BOARD DIAGNOSTIC TEST [ZJ, ZY].) • Connect a jumper wire between the evaporator temperature sensor terminals B and A (wiring harness-side). • Verify the A/CT V value. • Is the voltage less than 4.9 V?	Yes	Inspect the evaporator temperature sensor. (See EVAPORATOR TEMPERATURE SENSOR INSPECTION [MANUAL AIR CONDITIONER].) Replace the evaporator temperature sensor, if necessary. (See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].) Go to Step 8.
4		No	Go to the next step.
5	INSPECT PCM CONNECTOR AND TERMINALS • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 8.
5		No	Go to the next step.
6	INSPECT EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Evaporator temperature sensor and PCM connectors are disconnected. • Turn the ignition switch to the ON position (engine off). • Measure the voltage between evaporator temperature sensor terminal B (wiring harness-side) and body ground. • Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 8.
6		No	Go to the next step.
7	INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT • Evaporator temperature sensor and PCM connectors are disconnected. • Turn the ignition switch off. • Inspect for continuity between the following terminals (wiring harness-side): ― Evaporator temperature sensor terminal B and PCM terminal 1AW ― Evaporator temperature sensor terminal A and PCM terminal 1AG • Is there continuity?	Yes	Go to the next step.
7		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
8	VERIFY DTC TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [ZJ, ZY].) • Perform the KOEO/KOER self test. (See KOEO/KOER SELF TEST [ZJ, ZY].) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [ZJ, ZY].)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [ZJ, ZY].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ZJ, ZY].)
9		No	DTC troubleshooting completed.