INSPECTION PROCEDURE HINT: If diagnostic trouble codes "22" (engine coolant temperature sensor circuit), "24" (intake air temperature sensor circuit) and "41" (throttle position sensor circuit) are output simultaneously, E2 (sensor ground) may be open. 1 Check voltage between terminals THA and E2 of engine control module connector. ON SST ECM V THA B 45, 65 BE6653 FI6496 E2 P (1) Connect SST (check harness "A"). (See page EG-510) SST 09990-01000 (2) Turn ignition switch ON C Measure voltage between terminals THW and E2 of engine control module connector. OK Intake air temp. °C (°F) | Voltage 20 (68) | 0.5 - 3.4 V 60 (140) | 0.2 - 1.0 V NG OK Check for intermittent problems. (See page EG-505) 2 Check intake air temp. sensor. Mass Air Flow Meter 4 3 FI6961 P Disconnect the mass air flow meter connector. C Measure resistance between terminals 3 and 4 of mass air flow meter connector. OK Resistance is within Acceptable Zone on chart. Resistance kΩ 30 20 10 5 2 1 0.6 0.3 0.2 0.1 Acceptable Intake air temp. °C (°F) | Resistance 20 (68) | 2 - 3 kΩ 60 (14) | 0.4 - 0.7 kΩ -20 0 20 40 60 80 100 (-4) (32)(68)(104)(140)(176)(212) Temp. °C (°F) OK NG Replace intake air temp. sensor (Replace mass air flow meter). 3 Check for open and short in harness and connector between engine control module and intake air temp. sensor (See page IN-30) OK NG Repair or replace harness or connector. Check and replace engine control module.