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CMTC Test 4B - Incorrect Ambient Temperature Reading

NOTE: Perform CMTC TEST 4A  before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION  and WIRING DIAGRAMS  . Drive vehicle at least 3 miles (at greater than 25 MPH) to update CMTC and perform TEST VER-1A - VERIFICATION PROCEDURE  after each repair.
NOTE: For CMTC wiring diagram, see INSTRUMENT PANEL article in the ACCESSORIES & ELECTRICAL section.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting any module connector.
  1. Connect ambient temperature/battery temperature sensor. Disconnect Powertrain Control Module (PCM) Gray connector. Using external ohmmeter, measure resistance between terminals No. 43 and No. 52 on PCM harness connector.
  2. Compare with AMBIENT TEMPERATURE SENSOR SPECIFICATIONS  table in CMTC TEST 4A. If resistance measurement does not correspond with AMBIENT TEMPERATURE SENSOR SPECIFICATIONS table, go to next step. If sensor is within specification, replace CMTC module.
  3. Disconnect ambient temperature/battery temperature sensor. Using external ohmmeter, measure resistance between ground and terminal No. 1 (Black/Light Blue wire) on sensor connector. If resistance is less than 500 k/ohms, repair Black/Light Blue wire for partial short to ground. If resistance is 500 k/ohms or greater, go to next step.
  4. Move ohmmeter lead to terminal No. 2 (Violet/Light Green wire) on sensor connector. If resistance is less than 500 k/ohms, repair Violet/Light Green wire for partial short to ground. If resistance is 500 k/ohms or greater, repair Violet/Light Green wire for short to Black/Light Blue wire.
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