Camry CNG Models, Camry Gasoline Models With Manual A/C & Camry Solara With Manual A/C

CAUTION: If Engine Control Module (ECM) replacement is instructed in the following testing, always ensure ECM wiring harness electrical connector and ground circuit are okay. If either are defective, repair and repeat testing to confirm ECM malfunction.

Remove glove box for access to Engine Control Module (ECM). For illustration of ECM location, see THEORY & OPERATION article. Note ECM electrical connector terminals. See Figure and Figure .

Turn ignition on. Using voltmeter, check voltage between proper terminals on ECM for A/C evaporator temperature sensor. See ECM TERMINAL IDENTIFICATION FOR A/C EVAPORATOR TEMPERATURE SENSOR table. These are the THR and E2 terminals at ECM.

ECM TERMINAL IDENTIFICATION FOR A/C EVAPORATOR TEMPERATURE SENSOR

Application	ECM Connector	ECM Terminal No. (Wire Color)
Camry
CNG Models	E7	25 (Blue/Red)
E6		18 (Brown)
Gasoline Models
With Engine Immobilizer	E11	13 (Blue/Red)
E10		18 (Brown)
Without Engine Immobilizer	E11	25 (Blue/Red)
E10		18 (Brown)
Camry Solara
With Engine Immobilizer	E11	13 (Blue/Red)
E10		18 (Brown)
Without Engine Immobilizer	E11	25 (Blue/Red)
E10		18 (Brown)

Voltage should be 2.2-2.6 volts at 32°F (0°C) and 1.4-1.8 volts at 59°F (15°C). If voltage is not within specification, go to next step. If voltage is within specification, check ECM ground circuit. See WIRING DIAGRAMS article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. On Camry gasoline models and Camry Solara, if ECM is replaced and vehicle is equipped with engine immobilizer system, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
Check A/C evaporator temperature sensor operation. See A/C EVAPORATOR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES. If A/C evaporator temperature sensor operates properly, go to next step. If A/C evaporator temperature sensor is defective, replace A/C evaporator temperature sensor. See A/C EVAPORATOR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
Check wiring harness and electrical connectors between ECM and A/C evaporator temperature sensor. See WIRING DIAGRAMS article. It may be necessary to see appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING for complete wiring diagram. If wiring harness or electrical connector is defective, repair as necessary. If wiring harness and electrical connectors are okay, check ECM ground circuit. See WIRING DIAGRAMS article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. On Camry gasoline models and Camry Solara, if ECM is replaced and vehicle is equipped with engine immobilizer system, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.